Electrochemical polishing system for 3d printing titanium alloy surface

Abstract

The invention discloses an electrochemical polishing system for a 3d printed titanium alloy surface, which comprises a direct-current power supply, the direct-current power supply is used for providing direct-current voltage and current required by electrochemical polishing, the output voltage range of the direct-current power supply is 0-30V, the precision can reach 0.1 V, the output current range is 0-10A, and the direct-current power supply has overcurrent and overvoltage protection functions. The water bath magnetic stirring machine is scientific and reasonable in structure and safe and convenient to use, a polished titanium metal body is irregular in shape, a plurality of holes are formed in the surfaces of the side metal net and the bottom metal net, irregular titanium metal can stretch into the inner sides of the holes, and therefore the titanium metal can make full contact with the metal disc, and the titanium metal can be fully ground. And when polishing is started, titanium metal can be fully polished after the anode is started, so that the polishing effect is guaranteed, and the polishing efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of titanium alloy surface treatment, and in particular to an electrochemical polishing system for 3D printing titanium alloy workpieces, which is particularly suitable for efficient and uniform polishing of titanium alloy surfaces with complex geometric structures. Background Art

[0002] 3D printed titanium alloys are widely used in aerospace, medical implants and other fields due to their advantages of light weight, high strength and biocompatibility. However, the surface roughness (usually Ra>10μm) and residual oxide layer caused by the additive manufacturing process seriously restrict its fatigue performance and functional application. Traditional mechanical polishing has poor applicability and low efficiency for complex structure workpieces; chemical polishing is prone to environmental pollution and it is difficult to achieve submicron surface accuracy. Although electrochemical polishing technology can take into account both efficiency and environmental protection, the existing devices have the following defects:

[0003] 1. Uneven contact: The shape of titanium alloy workpieces is complex, and it is difficult for traditional fixed anodes to achieve uniform contact on the entire surface, resulting in partial over-polishing or under-polishing;

[0004] 2. Low mass transfer efficiency: Insufficient electrolyte flow affects reaction rate and surface consistency;

[0005] 3. Post-processing is cumbersome: manual cleaning and drying are required after polishing, which prolongs the process cycle. Summary of the invention

[0006] The present invention provides an electrochemical polishing system for 3D printing titanium alloy surface, which can effectively solve the problems of uneven contact, low mass transfer efficiency and complicated post-processing in the existing electrochemical polishing system. The present invention proposes an electrochemical polishing system for 3D printing titanium alloy workpieces.

[0007] To achieve the above object, the present invention provides the following technical solution: a system for electrochemical polishing of titanium alloy surface for 3D printing, comprising:

[0008] 1. DC power module: DC power output, output voltage 0-30V, accuracy ±0.1V, current 0-10A, integrated PWM pulse width modulation and over-current / over-voltage protection;

[0009] 2. Temperature control and stirring module: including a water bath tank of 20-100℃±1℃ and a magnetic stirring device, 50-1000r / min continuously variable speed, and a circulating water channel in the tank to achieve precise temperature control;

[0010] 3. Adaptive polishing component: porous metal plate: welded by side metal mesh and bottom metal mesh, with holes of 1-5mm in diameter distributed on the surface, suitable for irregular titanium alloy workpieces;

[0011] Adjustable electrode frame: The distance between cathode and anode can be adjusted by 5-50mm through threaded rod and connecting frame;

[0012] 4. Rapid drying module: integrated with dual mini fans (306), which realize the lifting and lowering of the metal plate and the surface airflow drying through the positioning thread groove and the return spring;

[0013] The magnetic stirring device is the mixer body.

[0014] Preferably, the water bath is a polished beaker as a container for the electrolyte, made of glass with strong chemical stability, with a capacity of 500ml-2000ml, and a clear scale mark on the outer wall to facilitate accurate measurement of the electrolyte volume;

[0015] The electrode plate includes a polished cathode and an anode, wherein the anode is made of an inert material and the polished cathode is customized according to the shape and size of the titanium alloy component sample;

[0016] The electrode frame is used to fix the electrode plate and can accurately adjust the distance between the polishing cathode and the anode within the adjustment range of 5-50 mm.

[0017] Preferably, the control circuit of the DC power supply integrates PWM pulse width modulation technology to achieve precise regulation of output voltage and current.

[0018] Preferably, a circulating water channel is provided inside the water bath, and the temperature of the electrolyte is controlled by the flow of circulating water.

[0019] Preferably, a polishing assembly is installed on the top of the mixer body;

[0020] The polishing assembly comprises a placing table, a polishing beaker, a magnetic stirring bar, a DC power supply, a cathode power line, an anode power line, a threaded rod, a connecting frame, a metal plate, a side metal mesh, a bottom metal mesh, a fixing screw hole and a fixing screw;

[0021] A placing table is installed at the top of the mixer body, a polishing beaker is connected to the top of the placing table, a magnetic stirring bar is magnetically attracted at the inner bottom of the polishing beaker, a DC power supply is installed at one side of the mixer body, a cathode power line is connected to the top of the DC power supply, and an anode power line is connected to the top of the DC power supply;

[0022] One end of the anode power line is connected to a threaded rod, the bottom end of the threaded rod is welded with a connecting frame, the bottom end of the connecting frame is welded with a metal plate, the outer side of the metal plate is welded with a side metal mesh, the bottom end of the metal plate is welded with a bottom metal mesh, the outer side of the metal plate is provided with a fixing screw hole, and the inner side of the fixing screw hole is threadedly connected with a fixing screw rod.

[0023] Preferably, one end of the cathode power line is placed at the inner side of the polishing beaker, and the input end of the DC power supply is electrically connected to the output end of the external power supply.

[0024] Preferably, there are two fixing screw holes, which are located at the outer side of the metal plate, and the input end of the mixer body is electrically connected to the output end of the external power supply.

[0025] Preferably, a fixing assembly is provided on one side of the mixer body;

[0026] The fixing assembly includes a base, a support rod, a connecting rod, a threaded barrel, an extension rod, a mini blower, a twist handle, a fixing thread, a return spring and a positioning thread groove;

[0027] A base is provided on one side of the mixer body, a support rod is welded to the top of the base, a threaded barrel is welded to the outside of the support rod, an extension rod is connected to the top of the threaded rod, a mini fan is welded to the outside of the threaded barrel, a twist handle is welded to the top of the extension rod, a fixed thread is provided on the outside of the threaded rod, a return spring is sleeved on the outside of the extension rod, and a positioning thread groove is provided on the inside of the threaded barrel.

[0028] Preferably, two mini fans are provided, and the two mini fans are symmetrically mounted on the outer end surface of the threaded barrel, and the input end of the mini fan is electrically connected to the output end of the external power supply.

[0029] Preferably, a molten solution used in a 3D printing titanium alloy surface electrochemical polishing system: the solution is ethylene glycol and sodium chloride, wherein the amount of acid or sodium chloride added is 0.5-2 mol / L.

[0030] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a scientific and reasonable structure and is safe and convenient to use:

[0031] 1. A polishing component is provided. The shape of the polished titanium metal body is irregular, and there are many holes on the surface of the side metal mesh and the bottom metal mesh. The irregular titanium metal will extend into the inside of these holes, so that the titanium metal is fully in contact with the metal disk, and thus fully in contact with the electrolyte, making it a part of the cathode. When the polishing starts, the anode is turned on so that the titanium metal can be fully polished, thereby ensuring the polishing effect and further improving the polishing efficiency.

[0032] 2. A fixing component is provided. The twist handle is turned to fix the twist handle to the threaded barrel through the fixed thread. Polishing can be performed at this time. After polishing, the connection between the fixed thread and the threaded barrel is released to reset the metal disc. At this time, the mini fan can be turned on to quickly dry the surface of the titanium metal to prevent the polishing liquid from scattering, reduce the cleaning efficiency and improve the polishing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0034] In the attached picture:

[0035] Figure 1 It is a schematic diagram of the overall structure of the system of the present invention;

[0036] Figure 2 It is a schematic diagram of the installation structure of the mixer body of the present invention;

[0037] Figure 3 It is a schematic diagram of the installation structure of the magnetic stirring bar of the present invention;

[0038] Figure 4 is a schematic structural diagram of the polishing assembly of the present invention;

[0039] Figure 5 It is a schematic diagram of the installation structure of the fixing screw hole of the present invention;

[0040] Figure 6 It is a schematic diagram of the structure of the fixing assembly of the present invention;

[0041] Numbers in the figure: 1, mixer body;

[0042] 2. Polishing assembly; 201. Placement table; 202. Polishing beaker; 203. Magnetic stirring bar; 204. DC power supply; 205. Cathode power line; 206. Anode power line; 207. Threaded rod; 208. Connecting frame; 209. Metal plate; 210. Side metal mesh; 211. Bottom metal mesh; 212. Fixing screw hole; 213. Fixing screw;

[0043] 3. Fixing assembly; 301. Base; 302. Support rod; 303. Connecting rod; 304. Threaded barrel; 305. Extension rod; 306. Mini fan; 307. Twist handle; 308. Fixing thread; 309. Return spring; 310. Positioning thread groove. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0045] Example: Figure 1 As shown, the present invention provides a technical solution, a system for electrochemical polishing of titanium alloy surface for 3D printing, comprising

[0046] 1. DC power module: DC power output, output voltage 0-30V, accuracy ±0.1V, current 0-10A, integrated PWM pulse width modulation and over-current / over-voltage protection;

[0047] 2. Temperature control and stirring module: including a water bath tank of 20-100℃±1℃ and a magnetic stirring device, 50-1000r / min continuously variable speed, and a circulating water channel in the tank to achieve precise temperature control;

[0048] 3. Adaptive polishing component: porous metal plate: welded by the side metal mesh 210 and the bottom metal mesh 211, with holes of 1-5 mm in diameter distributed on the surface, suitable for irregular titanium alloy workpieces;

[0049] Adjustable electrode frame: The distance between the cathode and anode can be adjusted by 5-50mm through the threaded rod 207 and the connecting frame 208;

[0050] 4. Rapid drying module: integrated with dual mini fans 306, which realize the lifting and lowering of the metal plate 209 and the surface airflow drying through the positioning thread groove 310 and the return spring 309;

[0051] The magnetic stirring device is a stirrer body 1;

[0052] The electrode plate includes a polished cathode and an anode. The anode is made of inert material, and the polished cathode is customized according to the shape and size of the titanium alloy component sample.

[0053] The electrode rack is used to fix the electrode plate and can accurately adjust the distance between the polishing cathode and the anode within the adjustment range of 5-50mm.

[0054] The control circuit of the DC power supply 204 integrates PWM pulse width modulation technology to achieve precise regulation of output voltage and current.

[0055] A circulating water channel is provided inside the water bath, and the temperature of the electrolyte is controlled by the flow of circulating water.

[0056] like Figure 2-6 As shown, a polishing assembly 2 is installed on the top of the mixer body 1;

[0057] The polishing assembly 2 includes a placement table 201, a polishing beaker 202, a magnetic stirring bar 203, a DC power supply 204, a cathode power line 205, an anode power line 206, a threaded rod 207, a connecting frame 208, a metal plate 209, a side metal mesh 210, a bottom metal mesh 211, a fixing screw hole 212 and a fixing screw 213;

[0058] A placing table 201 is installed at the top of the mixer body 1, a polishing beaker 202 is connected to the top of the placing table 201, a magnetic stirring bar 203 is magnetically attracted at the inner bottom position of the polishing beaker 202, a DC power supply 204 is installed on one side of the mixer body 1, a cathode power line 205 is connected to the top of the DC power supply 204, one end of the cathode power line 205 is placed at the inner position of the polishing beaker 202, the input end of the DC power supply 204 is electrically connected to the output end of the external power supply, so as to facilitate the generation of electrolyte, and an anode power line 206 is connected to the top of the DC power supply 204;

[0059] One end of the anode power line 206 is connected to a threaded rod 207, a connecting frame 208 is welded to the bottom end of the threaded rod 207, a metal plate 209 is welded to the bottom end of the connecting frame 208, a side metal mesh 210 is welded to the outside of the metal plate 209, a bottom metal mesh 211 is welded to the bottom end of the metal plate 209, a fixing screw hole 212 is provided on the outside of the metal plate 209, two fixing screw holes 212 are provided, and the two fixing screw holes 212 are provided at the outer side of the metal plate 209. The input end of the mixer body 1 is electrically connected to the output end of the external power supply, which is conducive to fixing the titanium metal. The inner side of the fixing screw hole 212 is threadedly connected to a fixing screw 213.

[0060] A fixing assembly 3 is provided on one side of the mixer body 1;

[0061] The fixing assembly 3 includes a base 301, a support rod 302, a connecting rod 303, a threaded barrel 304, an extension rod 305, a mini blower 306, a twist handle 307, a fixing thread 308, a return spring 309 and a positioning thread groove 310;

[0062] A base 301 is provided on one side of the mixer body 1, a support rod 302 is welded to the top of the base 301, a threaded barrel 304 is welded to the outside of the support rod 302, an extension rod 305 is connected to the top of the threaded rod 207, a mini fan 306 is welded to the outside of the threaded barrel 304, two mini fans 306 are provided, and the two mini fans 306 are symmetrically installed on the outer end surface of the threaded barrel 304, the input end of the mini fan 306 is electrically connected to the output end of the external power supply, so as to facilitate the drying of titanium metal, a twisting handle 307 is welded to the top of the extension rod 305, a fixing thread 308 is provided on the outside of the threaded rod 207, a return spring 309 is sleeved on the outside of the extension rod 305, and a positioning thread groove 310 is provided on the inside of the threaded barrel 304.

[0063] A molten solution used in a 3D printing titanium alloy surface electrochemical polishing system, the solution comprises ethylene glycol and sodium chloride, wherein the amount of acid or sodium chloride added is 0.5-2 mol / L.

[0064] The working principle and use process of the present invention are as follows: first, the operator places the titanium metal to be polished on the inner side of the metal plate 209. At this time, no matter what shape the titanium metal is, it will contact the side metal mesh 210 or the bottom metal mesh 211, so that the titanium metal is electrically connected to the anode power line 206, and then the titanium metal is fixed by tightening the fixing screw 213 inside the fixing screw hole 212. Then the operator puts the magnetic stirrer 203 into the polishing beaker 202, and puts the cathode power line 205 into the polishing beaker 202 at the same time. At this time, the mixer body 1 can be turned on, and then the magnetic stirrer 203 will automatically be magnetically adsorbed with the mixer body 1 at the bottom, so that the magnetic stirrer 203 can be fixed, and then the operator can pour the polishing solution into the polishing beaker 202;

[0065] Then the operator can press the threaded rod 207 to extend the metal disk 209 into the inner side of the polishing beaker 202, and then the operator sets the temperature of the mixer body 1 to the specified temperature and adjusts the rotation speed of the mixer body 1. At this time, the mixer body 1 and the DC power supply 204 can be turned on at the same time, and then the rotating polishing melt will continuously rotate and grind the surface of the titanium metal, and the surface of the titanium metal will continuously react, thereby completing the polishing. Moreover, since the shape of the polished titanium metal body is irregular, and there are many holes on the surfaces of the side metal mesh 210 and the bottom metal mesh 211, the irregular titanium metal will extend into the inner side of these holes, so that the titanium metal is fully in contact with the metal disk 209, making it a part of the cathode. When the polishing starts, the anode is turned on so that the titanium metal can be fully polished, thereby ensuring the polishing effect and further improving the polishing efficiency.

[0066] Next, during polishing, the twist handle 307 is pressed to overcome the elastic force of the reset spring 309, thereby placing the titanium metal into the polishing melt. At this time, the threaded rod 207 will slide to the bottom on the inner side of the threaded barrel 304, and when the titanium metal is placed into the polishing melt, the twist handle 307 is rotated to fix the twist handle 307 and the threaded barrel 304 through the fixed thread 308. At this time, polishing can be performed, and after polishing is completed, the connection between the fixed thread 308 and the threaded barrel 304 is released to reset the metal disk 209. At this time, the mini fan 306 can be turned on to quickly dry the surface of the titanium metal to prevent the polishing liquid from scattering, reduce the cleaning efficiency and improve the polishing efficiency.

[0067] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for electrochemical polishing of a titanium alloy surface for 3D printing, comprising a DC power supply (204), characterized in that:

1. DC power module: DC power output, output voltage 0-30V, accuracy ±0.1V, current 0-10A, integrated PWM pulse width modulation and over-current / over-voltage protection; 2. Temperature control and stirring module: including a water bath tank of 20-100℃±1℃ and a magnetic stirring device, 50-1000r / min continuously variable speed, and a circulating water channel in the tank to achieve precise temperature control; 3. Adaptive polishing component: porous metal plate: welded by a side metal mesh (210) and a bottom metal mesh (211), with holes with a diameter of 1-5 mm distributed on the surface, suitable for irregular titanium alloy workpieces; Adjustable electrode frame: The distance between the cathode and anode can be adjusted by 5-50 mm through the threaded rod (207) and the connecting frame (208); 4. Rapid drying module: integrated with dual mini fans (306), which realize lifting and lowering of the metal plate (209) and surface airflow drying through positioning thread grooves (310) and return springs (309); The magnetic stirring device is a stirring machine body (1).

2. The electrochemical polishing system for 3D printing titanium alloy surface according to claim 1, characterized in that: The water bath is a polished beaker (202) used as a container for the electrolyte, with a capacity of 500ml-2000ml and a clear scale mark on the outer wall; The electrode plates include polished cathodes and anodes; The electrode frame is used to fix the electrode plate and adjust the distance between the polishing cathode and the anode, and the adjustment range is 5-50mm.

3. The electrochemical polishing system for 3D printing titanium alloy surface according to claim 1, characterized in that: The control circuit of the DC power supply (204) integrates PWM pulse width modulation technology to accurately adjust the output voltage and current.

4. The electrochemical polishing system for 3D printing titanium alloy surface according to claim 1, characterized in that: A circulating water channel is provided inside the water bath, and the temperature of the electrolyte is controlled by the flow of circulating water.

5. The electrochemical polishing system for 3D printing titanium alloy surface according to claim 1, characterized in that: A polishing assembly (2) is installed at the top end of the mixer body (1); The polishing assembly (2) comprises a placement table (201), a polishing beaker (202), a magnetic stirrer (203), a DC power supply (204), a cathode power line (205), an anode power line (206), a threaded rod (207), a connecting frame (208), a metal plate (209), a side metal mesh (210), a bottom metal mesh (211), a fixing screw hole (212) and a fixing screw rod (213); A placing table (201) is installed at the top of the mixer body (1), a polishing beaker (202) is connected to the top of the placing table (201), a magnetic stirring bar (203) is magnetically attracted at the inner bottom of the polishing beaker (202), a DC power supply (204) is installed on one side of the mixer body (1), a cathode power line (205) is connected to the top of the DC power supply (204), and an anode power line (206) is connected to the top of the DC power supply (204); One end of the anode power line (206) is connected to a threaded rod (207), the bottom end of the threaded rod (207) is welded to a connecting frame (208), the bottom end of the connecting frame (208) is welded to a metal plate (209), the outer side of the metal plate (209) is welded to a side metal mesh (210), the bottom end of the metal plate (209) is welded to a bottom metal mesh (211), the outer side of the metal plate (209) is provided with a fixing screw hole (212), and the inner side of the fixing screw hole (212) is threadedly connected to a fixing screw rod (213).

6. The electrochemical polishing system for 3D printing titanium alloy surface according to claim 5, characterized in that: One end of the cathode power line (205) is placed at the inner side of the polishing beaker (202), and the input end of the DC power supply (204) is electrically connected to the output end of the external power supply.

7. The electrochemical polishing system for 3D printing titanium alloy surface according to claim 5, characterized in that: There are two fixing screw holes (212), which are located outside the metal plate (209). The input end of the mixer body (1) is electrically connected to the output end of the external power supply.

8. The electrochemical polishing system for 3D printing titanium alloy surface according to claim 5, characterized in that: A fixing component (3) is provided on one side of the mixer body (1); The fixing assembly (3) comprises a base (301), a support rod (302), a connecting rod (303), a threaded cylinder (304), an extension rod (305), a mini fan (306), a twist handle (307), a fixing thread (308), a return spring (309) and a positioning thread groove (310); A base (301) is provided on one side of the mixer body (1), a support rod (302) is welded to the top of the base (301), a threaded barrel (304) is welded to the outer side of the support rod (302), an extension rod (305) is connected to the top of the threaded rod (207), a mini fan (306) is welded to the outer side of the threaded barrel (304), a twist handle (307) is welded to the top of the extension rod (305), a fixing thread (308) is provided on the outer side of the threaded rod (207), a return spring (309) is sleeved on the outer side of the extension rod (305), and a positioning thread groove (310) is provided on the inner side of the threaded barrel (304).

9. The electrochemical polishing system for 3D printing titanium alloy surface according to claim 8, characterized in that: Two mini fans (306) are provided, and the two mini fans (306) are symmetrically mounted on the outer end surface of the threaded cylinder (304), and the input end of the mini fan (306) is electrically connected to the output end of the external power supply.

10. The melt used in the electrochemical polishing system for 3D printing titanium alloy surface according to any one of claims 1 to 9, characterized in that: The melt is ethylene glycol and sodium chloride, wherein the amount of acid or sodium chloride added is 0.5-2 mol / L.

Images