Electrolytic polishing system for titanium alloy ultrafine wires

Abstract

The utility model discloses an electrolytic polishing system for a titanium alloy ultrafine wire, which comprises an electrolytic tank, and the electrolytic tank is internally provided with a cathode tube, an anode tube, a cathode tube, a cathode tube, an anode tube, a cathode tube and an anode tube, the cathode tube is provided with multiple layers of cylindrical barrels which are coaxially sleeved and have different diameters, and the cylindrical barrels are arranged along the central axis in the horizontal direction; the potential of the cathode tube is higher than that of the titanium alloy ultrafine wire to be polished; the two insulated supporting nets are arranged at the two ends of the cathode tube; each supporting net comprises an inner circular ring and an outer circular ring which are concentrically arranged, a plurality of supporting rods are arranged between the inner circular ring and the outer circular ring in the radius direction of the supporting nets, and buckles are arranged at the positions, intersecting with the cylinder bodies, of the supporting rods; the buckles are used for clamping the corresponding barrels; the cathode sliding conducting strip is located on the outer side of one supporting net and used for being connected with a cathode of the direct-current power source; the anode guide wheel is located on the outer side of the other supporting net and used for being connected with an anode of a direct-current power source. The problems that an existing titanium alloy ultrafine wire cannot be subjected to online electrolytic polishing, and the diameter reduction of the polished wire is not uniform are solved.

Description

[Technical Field]

[0001] This utility model belongs to the field of surface treatment technology for titanium alloy ultrafine wires, and specifically relates to an electrolytic polishing system for titanium alloy ultrafine wires. [Background Technology]

[0002] In the medical field, with the ever-increasing demand for high-precision, high-purity medical devices, TC4 titanium alloy ultrafine filaments have become a key material for manufacturing precision medical implants and devices due to their superior mechanical properties, excellent corrosion resistance, and good biocompatibility. However, the surface treatment of these ultrafine filaments, especially achieving a highly glossy and uniform surface, has become a technical challenge. Traditional mechanical polishing methods are prone to causing filament deformation and breakage, and are difficult to achieve the ideal surface finish, thus failing to meet medical-grade requirements.

[0003] Against this backdrop, electropolishing, as an advanced surface treatment technology, is gradually emerging in the surface treatment of medical-grade TC4 titanium alloy ultrafine filaments. The advantages of electropolishing lie in its ability to uniformly and efficiently remove microscopic imperfections and oxide layers from material surfaces without direct contact with the workpiece, thus avoiding deformation and damage caused by mechanical stress. Furthermore, electropolishing can significantly improve the surface finish and corrosion resistance of materials, reduce the risk of bacterial adhesion, and enhance the biocompatibility and lifespan of medical devices.

[0004] In particular, for TC4 titanium alloy ultrafine filaments, electropolishing technology can precisely control the polishing process, avoiding excessive corrosion or the formation of localized corrosion pits, and ensuring that the diameter and performance of the filament remain stable during polishing. At the same time, electropolishing also has advantages such as high production efficiency, high automation, and low environmental pollution, meeting the demands of modern medical manufacturing for efficient, environmentally friendly, and high-quality production.

[0005] Given that ultrafine filaments have a large specific surface area due to their extremely small diameter, and the surface oxide layer exhibits extremely strong adhesion, these characteristics significantly increase the complexity and difficulty of achieving surface brightening treatment, making electropolishing a major technical bottleneck for ultrafine filaments. [Utility Model Content]

[0006] The purpose of this invention is to provide an electrolytic polishing system for titanium alloy ultrafine wires, in order to solve the problems that existing titanium alloy ultrafine wires cannot be electrolytic polished online and that the wire diameter reduction is uneven after polishing.

[0007] This utility model adopts the following technical solution: an electrolytic polishing system for titanium alloy ultrafine wires, comprising an electrolytic cell, wherein the electrolytic cell is equipped with:

[0008] A cathode tube has multiple layers of cylindrical tubes of different diameters coaxially nested together, arranged horizontally along the central axis; the potential of the cathode tube is higher than the potential of the titanium alloy ultrafine wire to be polished.

[0009] Two insulated support meshes are set at both ends of the cathode tube; each support mesh includes an inner ring and an outer ring arranged concentrically, and multiple support rods are arranged between the inner ring and the outer ring along their radial direction. Buckles are set on each support rod at the intersection with each layer of the cylinder; the buckles are used to clamp the corresponding cylinder.

[0010] A cathode sliding conductive sheet is located outside one of the support meshes and is used to connect to the cathode of a DC power supply.

[0011] An anode guide wheel, located outside another support mesh, is used to connect to the anode of a DC power supply;

[0012] The cathode sliding conductive sheet includes a conductive connecting rod fixed to the inner wall of the electrolytic cell, which is connected to the cathode of the DC power supply. The conductive connecting rod is parallel to the support mesh and does not contact it. A sliding guide rod is provided on the conductive connecting rod, which can move back and forth along it. A conductive sheet is connected to the sliding guide rod, and the conductive sheet points to the inside of the cathode tube. The conductive sheet is used to make contact with the cylinders of different radii on the cathode tube in sequence during the process of moving with the sliding guide rod.

[0013] The cathode tube has a cylinder with the smallest inner diameter, through which the ultrafine titanium alloy wire to be polished passes. The cathode tube is used to select one of the cylinders to contact the conductive sheet for conduction during the sliding of the sliding guide rod. The anode guide wheel is used to contact the ultrafine titanium alloy wire to be polished for conduction. The cathode cylinder, the section of ultrafine titanium alloy wire to be polished located inside the cathode tube, and the electrolyte constitute a dynamic and complete electrolysis circuit.

[0014] Furthermore, the electropolishing apparatus also includes a DC power supply located outside the electrolytic cell, with its anode connected to the anode guide wheel and its cathode connected to the conductive connecting rod.

[0015] Furthermore, a pair of intermediate guide wheels are provided on the outer side of the cathode sliding conductive sheet.

[0016] Furthermore, a tension wheel and a take-up / unwind wheel are sequentially installed on the side of the central guide wheel furthest from the cathode tube.

[0017] Furthermore, a tension wheel and a take-up / unwind wheel are sequentially arranged on the side of the anode guide wheel away from the cathode tube.

[0018] Furthermore, an ultrasonic cleaning tank is provided on the side of the electrolytic cell near the wire exit.

[0019] Furthermore, if the diameter of the titanium alloy ultrafine wire to be polished is d, then the outer diameter of the cylinder connected to the cathode is D = (20-500)d, the distance between adjacent cylinders is 0.1-10mm, and the ratio of the outer diameter of a single-layer cylinder to its wall thickness is 20-50.

[0020] The beneficial effects of this invention are as follows: This invention uses a multi-layered cylindrical cathode tube as the polishing cathode. During electrolysis, the curved surface of the cathode tube and the curved surface of the wire achieve the same curvature and equidistant distance. Electrolysis is then performed according to the optimal spacing determined by the Hull cell experiment, achieving multi-directional synergy of the wire during electrolytic polishing. This process not only fully guarantees the polishing effect of the wire surface, but also ensures consistent diameter reduction of the wire at different locations due to the uniform electric field and ion distribution within the tube-shaped cathode. This invention designs the cathode tube as a multi-layered cylindrical structure, with no connection between the cylinders. The size of the cylinder connected to the cathode is adjusted according to the diameter of the titanium alloy ultrafine wire connected to the anode, which can meet the polishing requirements of materials with different surface areas, expand the range of electrolytic polishing, improve usability, and fully guarantee the polishing effect. [Attached Image Description]

[0021] Figure 1 This is a schematic diagram of the electrolytic polishing system for titanium alloy ultrafine wires according to this utility model;

[0022] Figure 2 for Figure 1 Enlarged schematic diagram of the central support network;

[0023] Figures 3 to 5 The images show the surface quality test results of wires of different specifications obtained in Examples 1 to 3, respectively.

[0024] Among them, 1. Centering guide wheel; 2. Anode guide wheel; 3. Cathode tube; 31. Cylinder; 4. Operating table; 5. Ultrasonic cleaning tank; 6. Tension wheel; 7. Take-up and unload reel; 8. Support net; 81. Inner ring; 82. Outer ring; 83. Support rod; 84. Buckle; 9. Cathode sliding conductive sheet; 91. Conductive connecting rod; 92. Sliding guide rod; 93. Conductive sheet; 10. Electrolytic cell; 11. DC power supply.

Detailed Implementation Methods

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] This invention provides an electrolytic polishing system for titanium alloy ultrafine filaments, wherein the diameter of the titanium alloy ultrafine filaments to be polished is 0.1-0.5 mm. Figure 1As shown, the electropolishing system includes an electrolytic cell 10 containing electrolyte. The electrolyte is an alkyd system, composed of perchloric acid, methanol, and ethanol, wherein the ratio of perchloric acid:methanol:ethylene glycol is 1–10:5–10:1–5. During electrolysis, the voltage range is 0–100V, the pH value is 1–6, and the liquid temperature should be maintained between 0–80℃. The electrolyte is transported from a storage tank to the electrolytic cell 10 via a circulation pump. The storage tank is equipped with a replaceable filter cartridge. The electrolytic cell 10 is equipped with temperature and concentration sensors, which can be read and controlled by the control panel 4. When the electrolyte temperature is higher than the set temperature, the cooling circulation pump can be activated by the control panel 4.

[0027] The electrolytic cell 10 contains a cathode tube 3, two insulated support meshes 8, a cathode sliding conductive plate 9, and an anode guide wheel 2. The specific structure is as follows:

[0028] The cathode tube 3 has multiple layers of cylindrical bodies 31 of different diameters coaxially arranged, which are arranged horizontally along the central axis; the potential of the cathode tube 3 is higher than the potential of the titanium alloy ultrafine wire to be polished; the cathode tube 3 is composed of multiple layers of thin-walled bodies 31, and the radius of the bodies 31 increases from the inside to the outside.

[0029] Electrolytic polishing works by using an electric current to dissolve impurities and oxides on the anode surface of an electrolytic cell. During the process, when current passes through the anode, it dissolves, causing metal atoms to lose electrons and release positively charged ions. These positively charged ions then react with negatively charged ions in the electrolyte to form corresponding metal salts near the anode. Simultaneously, the cathode gains electrons, causing the positively charged ions in the electrolyte to undergo a reduction reaction on the cathode surface, generating reduction products. The anode and cathode of the electrolytic cell form a closed electrolytic circuit through the gain and loss of electrons by ions in the electrolyte. Therefore, depending on the type of titanium alloy ultrafine wire to be polished, the cathode material in this invention needs to be selected with a potential higher than that of the titanium alloy ultrafine wire. For example, platinum can be used to make the cathode tube 3, as its potential is higher than that of titanium and titanium alloys, resulting in better conductivity.

[0030] Two insulating support nets 8 are provided at both ends of the cathode tube 3; each support net 8 includes an inner ring 81 and an outer ring 82 arranged concentrically, and multiple support rods 83 are arranged between the inner ring 81 and the outer ring 82 along their radial direction. A buckle 84 is provided on each support rod 83 at the intersection with each layer of cylinder 31; the buckle 84 is used to clamp the corresponding cylinder 31.

[0031] A cathode sliding conductive sheet 9 is located outside one of the support meshes 8 and is used to connect to the cathode of a DC power supply; an anode guide wheel 2 is located outside the other support mesh 8 and is used to connect to the anode of a DC power supply. The anode guide wheel 2 is made of graphite-based, coke-based, or carbon-based material, with a resistivity of 1 to 5, a guide wheel hardness of 30 to 35 Hv, a contact voltage drop of 0 to 20 V, and a friction coefficient of 0 to 0.5 mm.

[0032] The cathode sliding conductive plate 9 and the anode guide wheel 2 should be arranged on both sides of the cathode tube 3. This distribution can increase the closed loop length of the electrolytic cell, so that the movement range of ions in the electrolyte covers the movement range of the wire, and the electrolysis process is more uniform.

[0033] The cathode sliding conductive sheet 9 includes a conductive connecting rod 91 fixed to the inner wall of the electrolytic cell 10, which is connected to the cathode of the DC power supply. The conductive connecting rod 91 is parallel to the support mesh 8 and does not contact it. The conductive connecting rod 91 is provided with a sliding guide rod 92 that can move back and forth along it. The sliding guide rod 92 is connected to a conductive sheet 93, which points to the inside of the cathode tube 3. The conductive sheet 93 is used to make contact with the cylinders 31 of different radii on the cathode tube 3 in sequence during the process of moving with the sliding guide rod 92.

[0034] Among them, the smallest inner diameter cylinder 31 of the cathode tube 3 is used for the titanium alloy ultrafine wire to be polished to pass through; the cathode tube 3 is used to select one of the cylinders 31 to contact the conductive sheet 93 for conduction during the sliding process of the sliding guide rod 92; the anode guide wheel 2 is used to contact the titanium alloy ultrafine wire to be polished for conduction; the cathode cylinder 31, the section of titanium alloy ultrafine wire to be polished located in the cathode tube 3 and the electrolyte form a dynamic and complete electrolysis circuit.

[0035] Because the titanium alloy ultrafine wire to be polished at the anode is constantly in motion, only the section of the ultrafine wire located inside the cathode tube 3, together with the cylinder 31 connected to the cathode and the electrolyte, forms a closed electrolytic circuit. This circuit allows for the electrolytic polishing of the ultrafine wire located inside the cathode tube 3. This electrolytic circuit is dynamically changing; once the ultrafine wire is exited from the cathode tube 3, the portion outside the cathode tube no longer forms an electrolytic circuit. This dynamic process enables online electrolytic polishing of the wire, with the wire length not limited by the length of the electrolytic polishing tank, allowing for an effective processing length of ≥2000m.

[0036] The ultrafine titanium alloy wire to be polished serves as the anode in the electrolytic cell 10, and the cathode tube 3 serves as the cathode. After being connected to a DC power supply, an electrolytic reaction occurs, achieving the purpose of removing the oxide layer from the wire surface. This invention designs the cathode tube 3 as a multi-layered thin-walled cylindrical structure. By adjusting the position of the sliding conductive sheet, the appropriate layer of the cylindrical tube 31 is selected based on the diameter of the ultrafine titanium alloy wire to be polished, thus determining the spacing between the anode and cathode. This minimizes the diameter reduction of the wire during polishing and improves the product yield.

[0037] This invention designs the cathode tube 3 as a multi-layered cylindrical structure, allowing adjustment of the distance between the anode and cathode according to the diameter of the titanium alloy ultrafine wire to be polished, thus minimizing the diameter reduction of the titanium alloy ultrafine wire during the polishing process. This invention uses a multi-layered coaxial cylindrical body 31 as the cathode tube. During electrolysis, the curved surface of the cathode has the same curvature and spacing as the curved surface of the titanium alloy ultrafine wire to be polished. The electric field and ion distribution within the cathode tube 3 are uniform, ensuring consistent diameter reduction of the titanium alloy ultrafine wire at different locations during electrolysis, thus fully guaranteeing the polishing effect on the wire surface.

[0038] In some embodiments, the electropolishing apparatus further includes a DC power supply 11 located outside the electrolytic cell 10, with its anode connected to the anode guide wheel 2 and its cathode connected to the conductive connecting rod 91.

[0039] In some embodiments, a pair of intermediate guide wheels 1 are provided on the outer side of the cathode sliding conductive sheet 9. The intermediate guide wheels 1 are deep V-shaped guide wheels, and the guide wheel bearings are fixed on an adjustable support frame. By adjusting the intermediate guide wheels 1 up and down and back and forth, the titanium alloy ultrafine wire to be polished can be stably positioned coaxially with the cathode tube 3.

[0040] In some embodiments, a tension wheel 6 and a take-up / unwind wheel 7 are sequentially arranged on the side of the guide wheel 1 away from the cathode tube 3. During the adjustment of the tension wheel 6, it must be ensured that the titanium alloy ultrafine wire to be polished is in close contact with the anode guide wheel 2, and the titanium alloy ultrafine wire to be polished is always in a coaxial position with the cathode tube 3, so that the distance from the circumference of the cathode tube 3 to the inner wall of the cathode tube 3 is equal.

[0041] By coordinating the adjustment of the central guide wheel 1 and the tension wheel 6, the titanium alloy ultrafine wire to be polished is in a pre-tensioned state, with a tension of <1-5%Rm. At the same time, it maintains a close fit with the anode guide wheel 2, maintaining a stable anode voltage. It can also run stably at high speed, with a polishing speed of 50m / min, which is much greater than the approximately 5m / min of ordinary belt polishing machines.

[0042] In some embodiments, a tension wheel 6 and a take-up / unwind wheel 7 are sequentially arranged on the side of the anode guide wheel 2 away from the cathode tube 3.

[0043] Several small guide wheels are arranged between the anode guide wheel 2 and the adjacent tension wheel 6, and several small guide wheels are also arranged between the centering guide wheel 1 and the adjacent tension wheel 6. Through the arrangement and cooperation of the various small guide wheels, the vibration of the filament under tension can be effectively reduced, so that the ultrafine filament enters the electrolytic cell evenly and stably under tension, and the electrolyte completely immerses the filament.

[0044] In some embodiments, an ultrasonic cleaning tank 5 is provided on the side of the electrolytic cell 10 near the wire exit. The ultrasonic cleaning tank 5 has a cleaning frequency of 10-100 Hz.

[0045] In some embodiments, the diameter of the titanium alloy ultrafine wire to be polished is d, then the diameter D of the cylinder 31 connected to the cathode is (20-500)d, the spacing between adjacent cylinders 31 is 0.1-10mm, and the ratio of the outer diameter of a single-layer cylinder 31 to its wall thickness is 20-50.

[0046] The positions of each layer of cylinder 31 inside the cathode tube 3 are supported by an insulating support net 8. The head and tail of the multi-layer cylinder 31 are fixed by the support net 8. The inner ring 81 and outer ring 82 on the support net 8 are coaxial with the multi-layer cylinder 31. Multiple buckles 84 are evenly distributed along the radial direction of the inner ring 81 and outer ring 82. The multi-layer cylinder 31 is fixed to the position of the buckles 84 from the inside to the outside to ensure that the spacing between the multi-layer cylinder 31 meets the requirement of 0.1-10mm.

[0047] It also includes an operating table equipped with electrolytic cell temperature and concentration sensors and an electrolyte circulation cooling filter pump. The system detects and records data during the electrolysis process. The circulation cooling pump circulates the electrolyte, and the filter element in the storage tank filters oxides while simultaneously cooling the electrolyte to ensure a constant electrolyte temperature. This ensures uniform electrolyte consistency during the electrolysis process and consistent finish during the metal wire polishing process.

[0048] This utility model discloses an electrolytic polishing method for an electrolytic polishing system of titanium alloy ultrafine wires, comprising the following:

[0049] Step 1: The titanium alloy ultrafine wire to be polished passes through the anode guide wheel 2 and into the innermost cylinder 31 of the cathode tube 3, which has the smallest diameter. After passing through the cathode tube 3, it passes through the centering guide wheel 1 and enters the electrolytic cell 10. After passing through the electrolytic cell 10, it passes through the ultrasonic cleaning tank 5 and is finally taken to the take-up and unwinding reel 7.

[0050] Step 2: Adjust the sliding rod 92 on the cathode sliding conductive plate 9 and connect it to the cylinder 31 with an outer diameter of D in the cathode tube 3 to obtain a closed circuit; where D = (20-500)d, and d is the diameter of the titanium alloy ultrafine wire to be polished;

[0051] Step 3: Adjust the centering guide wheel 1, the two tension wheels 6 and the anode guide wheel 2; observe the online operation of the titanium alloy ultrafine wire to be polished through the anode guide wheel 2, and confirm that the titanium alloy ultrafine wire to be polished is in close contact with the anode guide wheel 2 during operation and does not vibrate;

[0052] Step 4: Turn on the electrolyte circulation pump to fully immerse the cathode tube 3 in electrolyte and check the electrolyte temperature;

[0053] Step 5: Set the DC power supply voltage to 5-80V, turn on the DC power supply 11, and adjust the voltage of the DC power supply 11 to cover the contact voltage drop of the anode guide wheel 2. Electrolytic polishing will then begin.

[0054] Simultaneously, the take-up and unwinding device is turned on, and the ultrasonic cleaning tank 5 is turned on. Deionized water is used for ultrasonic cleaning to clean the residual electrolyte on the surface of the titanium alloy ultrafine wire to be polished, thereby obtaining the cleaned electropolished titanium alloy ultrafine wire.

[0055] In some embodiments, in step 1, the tension of the two tension wheels 6 is ≤ (1-5%) of the tensile strength, the winding and unwinding speed is 1-5 m / min, and the running speed of the titanium alloy ultrafine wire to be polished is 1-50 m / min. The tensile strength is measured during the polishing process.

[0056] In some embodiments, in step 4, the electrolyte temperature is <80°C and the pH value is in the range of 1-6.

[0057] Example

[0058] This utility model is implemented according to the following methods in Examples 1 to 3, and the parameters in each example are shown in Table 1.

[0059] Step 1: The titanium alloy ultrafine wire to be polished passes through the anode guide wheel 2 and into the innermost cylinder 31 of the cathode tube 3, which has the smallest diameter. After passing through the cathode tube 3, it passes through the centering guide wheel 1 and enters the electrolytic cell 10. After passing through the electrolytic cell 10, it passes through the ultrasonic cleaning tank 5 and is finally taken to the take-up and unwinding reel 7.

[0060] Step 2: Adjust the sliding rod 92 on the cathode sliding conductive plate 9 and connect it to the cylinder 31 with an outer diameter of D in the cathode tube 3 to obtain a closed circuit; where D = (20-500)d, and d is the diameter of the titanium alloy ultrafine wire to be polished;

[0061] Step 3: Adjust the centering guide wheel 1, the two tension wheels 6 and the anode guide wheel 2; confirm that the titanium alloy ultrafine wire to be polished is in close contact with the anode guide wheel 2 during operation and does not vibrate;

[0062] Step 4: Turn on the electrolyte circulation pump to fully immerse the cathode tube 3 in electrolyte and check the electrolyte temperature;

[0063] Step 5: Turn on the DC power supply 11, adjust the voltage of the DC power supply 11 to cover the contact voltage drop of the anode guide wheel 2, and the electrolytic polishing will begin.

[0064] Simultaneously, the take-up and untake-down device is activated, and the ultrasonic cleaning tank 5 is turned on to obtain the cleaned electrolytically polished titanium alloy ultrafine wire.

[0065] Table 1. Process parameters involved in the three embodiments.

[0066]

[0067] The electropolishing length of conventional materials is limited by the length of the equipment, which is equal to the length of the cathode. However, the lengths of the titanium alloy ultrafine wires to be polished in the three embodiments described above all exceed 2000m, and the wire length is not limited by the length of the electropolishing tank, thus realizing online electropolishing of the wires.

[0068] Surface quality tests were conducted on samples of the three specifications of filaments obtained from polishing in Examples 1-3, and the surface quality test results for the different specifications of filaments are as follows: Figures 3 to 5 As can be seen from the figure, the surface quality of all three specifications of wire is bright.

[0069] Conventional electrolysis equipment uses a structure where an anode wire and a cathode plate work together. The cathode plate is a flat plate, and because there's a difference in distance between the side of the wire closest to the cathode plate and the side furthest from it (the difference being equal to the diameter of the polishing wire), the side closer to the cathode plate is polished more thoroughly than the side furthest away, even with the same electrolytic polishing parameters. Therefore, the final surface quality after electrolysis is less uniform than with a cathode tube. This invention, however, uses a tubular structure for the cathode tube 3, allowing the electrolyte to evenly coat both the wire to be polished and the cathode tube. With the wire and cathode tube concentric, the distance between them is equal at different positions with the same curvature. This effectively improves the uniformity of diameter reduction during titanium alloy ultrafine wire polishing and allows for precise control of the diameter of the bright wire.

[0070] The diameter of the polished titanium alloy ultrafine wires in the three embodiments was measured at random multiple points, for example, at 10 random locations on the titanium alloy ultrafine wires. The measurement results are shown in Table 2. The results in Table 2 show that the diameter of the polished titanium alloy ultrafine wires in the three embodiments is uniform, with no melting or breakage, indicating that the diameter reduction is uniform during the electrolytic polishing process.

[0071] Table 2. Diameter statistics of polished titanium alloy ultrafine wires in the three examples.

[0072]

[0073] This invention uses a multi-layered cylindrical cathode tube as the polishing cathode. During electrolysis, the curved surface of the cathode tube and the curved surface of the wire are equidistant with the same curvature. Electrolysis is then performed according to the optimal spacing determined by the Hull cell experiment, achieving multi-directional synergy of the wire during electrolytic polishing. This process not only fully guarantees the polishing effect of the wire surface, but also ensures consistent diameter reduction of the wire at different locations due to the uniform electric field and ion distribution within the tube cathode.

[0074] This invention designs the cathode tube as a multi-layered cylindrical structure with no connection between the cylinders. The size of the cylinder connected to the cathode is adjusted according to the diameter of the titanium alloy ultrafine wire connected to the anode, which can meet the polishing requirements of materials with different surface areas, expand the range of electrolytic polishing, improve usability, and fully guarantee the polishing effect.

[0075] This invention focuses on the application of electropolishing technology in the surface treatment of 0.1-0.5mm TC4 titanium alloy ultrafine filaments for medical use. It aims to further improve the surface quality and production efficiency of ultrafine filaments by optimizing electropolishing process parameters, and to provide a more reliable and efficient solution for the manufacturing of medical devices.

Claims

1. An electrolytic polishing system for titanium alloy ultrafine wires, characterized in that, Includes an electrolytic cell (10), wherein the electrolytic cell (10) is provided with: A cathode tube (3) has multiple layers of cylindrical tubes (31) of different diameters coaxially arranged in a horizontal direction along the central axis; the potential of the cathode tube (3) is higher than the potential of the titanium alloy ultrafine wire to be polished. Two insulating support meshes (8) are disposed at both ends of the cathode tube (3); each support mesh (8) includes a concentric inner ring (81) and an outer ring (82), and a plurality of support rods (83) are disposed between the inner ring (81) and the outer ring (82) along their radial direction. A buckle (84) is disposed on each of the support rods (83) at the intersection with each layer of the cylinder (31); the buckle (84) is used to clamp the corresponding cylinder (31); A cathode sliding conductive sheet (9) is located outside one of the support meshes (8) and is used to connect to the cathode of a DC power supply; An anode guide wheel (2), located outside the other support mesh (8), is used to connect to the anode of a DC power supply; The cathode sliding conductive sheet (9) includes a conductive connecting rod (91) fixed to the inner wall of the electrolytic cell (10), which is connected to the cathode of the DC power supply. The conductive connecting rod (91) is parallel to the support mesh (8) and does not contact it. The conductive connecting rod (91) is provided with a sliding guide rod (92) that can move back and forth along it. The sliding guide rod (92) is connected to a conductive sheet (93), which points to the inside of the cathode tube (3). The conductive sheet (93) is used to make contact with the cylinders (31) of different radii on the cathode tube (3) in sequence during the process of moving with the sliding guide rod (92). Among them, the innermost cylinder (31) of the cathode tube (3) is used for the passage of the titanium alloy ultrafine wire to be polished; the cathode tube (3) is used to select one of the cylinders (31) to contact the conductive sheet (93) for conduction during the sliding process of the sliding guide rod (92); the anode guide wheel (2) is used to contact the titanium alloy ultrafine wire to be polished for conduction; the cathode cylinder (31), the section of titanium alloy ultrafine wire to be polished located in the cathode tube (3) and the electrolyte form a dynamic and complete electrolysis circuit.

2. The electrolytic polishing system for titanium alloy ultrafine wires as described in claim 1, characterized in that, The electropolishing apparatus also includes a DC power supply (11) located outside the electrolytic cell (10), with its anode connected to the anode guide wheel (2) and its cathode connected to the conductive connecting rod (91).

3. The electrolytic polishing system for titanium alloy ultrafine wires as described in claim 1 or 2, characterized in that, A pair of intermediate guide wheels (1) are provided on the outer side of the cathode sliding conductive sheet (9).

4. The electrolytic polishing system for titanium alloy ultrafine wires as described in claim 3, characterized in that, The centering guide wheel (1) is provided with a tension wheel (6) and a take-up and unwind wheel (7) on the side away from the cathode tube (3).

5. The electrolytic polishing system for titanium alloy ultrafine wires as described in claim 1 or 2, characterized in that, A tension wheel (6) and a take-up / unwind wheel (7) are sequentially arranged on the side of the anode guide wheel (2) away from the cathode tube (3).

6. The electrolytic polishing system for titanium alloy ultrafine wires as described in claim 1 or 2, characterized in that, An ultrasonic cleaning tank (5) is provided on the side of the electrolytic cell (10) near the wire exit.

7. The electrolytic polishing system for titanium alloy ultrafine wires as described in claim 1 or 2, characterized in that, The diameter of the titanium alloy ultrafine wire to be polished is d. Then the outer diameter of the cylinder (31) connected to the cathode is D = (20-500)d. The distance between adjacent cylinders (31) is 0.1-10mm. The ratio of the outer diameter of a single-layer cylinder (31) to its wall thickness is 20-50.

Images