Electrolytic oxidation surface treatment device

Abstract

The invention belongs to the field of electrolytic oxidation surface treatment, and relates to an electrolytic oxidation surface treatment device. The method mainly relates to a device for conveying electrolyte into a deep hole, a pneumatic local electrolyte stirring device, a current shunting device and a corresponding use method. The deep hole air bag problem can be solved in the electrolytic oxidation surface treatment process, and the uniformity degree of an oxidation film is improved.

Description

Technical Field

[0001] The invention belongs to the field of electrolytic oxidation surface treatment and relates to an electrolytic oxidation surface treatment device. Background Art

[0002] Electrolytic oxidation generally refers to the process of using parts as anodes for electrochemical oxidation reactions. Depending on the properties of the oxide film and the process methods, the mainstream processes include anodic oxidation, hard anodizing, micro-arc oxidation, etc. Electrolytic oxidation treatment can generate a ceramic uniform oxide film layer of tens to hundreds of microns on the metal surface. By adjusting the process parameters, the oxide film layer can have good corrosion resistance, wear resistance, electrical insulation, coloring and other functions. Non-ferrous metals and their alloys (aluminum, magnesium, titanium) can be surface treated by electrolytic oxidation, and the types of substrates they are suitable for are rich. Various electrolytic oxidation processes are widely used in the manufacturing of parts in aviation, aerospace, shipbuilding, weapons, automobiles and other fields.

[0003] During the electrolytic oxidation process, parts need to be in contact with the electrolyte to achieve electrical conductivity. When parts have complex structures such as deep blind holes, inner cavities, and concave surfaces, the electrolyte will not be able to completely immerse the holes or concave surfaces, resulting in the appearance of air pockets. The electrochemical oxidation process cannot be carried out at the air pockets because there is no electrical conductivity. At the same time, the chemical dissolution process cannot occur at this location because it cannot come into contact with acidic solutions. An oxide film layer cannot be generated at the air pockets, which often leads to severe corrosion of parts first in deep blind holes, inner cavities, and concave surfaces. Therefore, eliminating the air pocket phenomenon during the electrolytic oxidation process of parts, increasing the fluidity of the electrolyte, accurately controlling the current density, and achieving uniform coating at the above-mentioned complex structures can effectively delay corrosion and wear and increase the service life of parts. Summary of the Invention

[0004] This invention provides an electrolytic oxidation surface treatment device. The device consists of three main components: localized liquid circulation, pneumatic localized stirring, and current density control and diversion. These components work together to eliminate bubbles, locally stir the electrolyte, and accurately control current density, promoting uniform growth of the electrolytic oxide film in deep holes on components. Furthermore, the device can be flexibly designed to work with existing tooling, making it suitable for various tank types and components.

[0005] According to one aspect of the present application, there is provided an electrolytic oxidation surface treatment device, comprising a tank body, a liquid phase local circulation device, a gas phase local stirring device, and a current density control device;

[0006] The liquid phase local circulation device is arranged on one side of the tank body, and the gas phase local stirring device and the current density control device are arranged on the other side of the tank body.

[0007] The liquid phase local circulation device comprises a variable frequency speed regulating motor (1-1), a rotating shaft (1-2), a housing (1-3), a triangular roller (1-4), an integrated lever (1-5), and a conveying hose (1-6);

[0008] The variable frequency speed regulating motor 1 can be selected according to the application scenario, and is preferably a step-by-step speed regulating motor, and the motor rotation speed can be regulated by frequency conversion according to the working conditions;

[0009] The rotating shaft (1-2) is gear-shaped;

[0010] The housing (1-3) is square, with a circular hollow shape in the middle and a through hole in the upper right corner;

[0011] The triangular roller (1-4) is manufactured by integrated laser selective melting of three circular wheels (1-4-1) and a central disc (1-4-2); a hole is provided at the center of the central disc (1-4-2) to match the rotating shaft (1-2); the circular wheel (1-4-1) is an inscribed circle of the hollow circle of the outer shell; after installation, a 2mm gap exists between the circular wheel (1-4-1) and the outer shell (1-3); and the material of the triangular roller is titanium alloy to prevent corrosion.

[0012] The triangular roller (1-4) has the same thickness as the housing (1-3) and forms an independent and detachable component after installation;

[0013] The integrated bar (1-5) is fixed to the variable frequency speed regulating motor (1-1) and the trough body, and can pass through the through hole at the upper right corner of the shell (1-3). The shell (1-3) can be fixed by the integrated bar (1-5).

[0014] The delivery hose (1-6) delivers the electrolyte to the air bag position so that the liquid phase local circulation area is close to the blind hole, inner cavity and concave surface of the part, thereby achieving air bag elimination.

[0015] The gas phase local stirring device comprises a diverter pipe (2-1), a diverter valve (2-2), and a flow meter (2-3);

[0016] The flow meter (2-3) can control the flow of compressed air;

[0017] The diverter valve (2-2) can control whether gas passes through the diverter pipe (2-1);

[0018] The diverter pipe (2-1) transports gas to achieve bubble agitation and stirring;

[0019] One diverter valve (2-2) controls one diverter pipe (2-1), and one flow meter (2-3) can control multiple diverter valves (2-2).

[0020] The flow meter (2-3) is connected to a compressed air source.

[0021] The current density control device is a current distributor with multiple outputs including an external power supply.

[0022] The current distributor can limit the current and adjust the current sharing ratio according to needs to evenly distribute the current to circuits with different loads;

[0023] The current density control device is connected with an anode lead plate and a cathode lead tube.

[0024] The anode lead plates may be multiple pieces connected in series;

[0025] The cathode lead tubes are multiple and connected in parallel.

[0026] The positive pole of the current density control device is connected to multiple parallel parts; the negative pole of the current density control device is sequentially connected to multiple anode lead plates in series and multiple cathode lead tubes in parallel; and the current loop is realized in conjunction with the electrolyte in the tank body.

[0027] Parts can be placed crosswise with the cathode lead pipe to eliminate the difference in conversion film thickness on the surface of parts caused by uneven distribution of power lines.

[0028] The part has at least one of a deep blind hole, a cavity, or a groove.

[0029] The liquid-phase local circulation device, gas-phase local stirring device, and current density control device can be used independently or installed together within the tank. Considering the issue of excessive piping entanglement and electrical safety requirements, it is preferable to install the gas-phase local stirring device and current density control device on one side of the tank, while the liquid-phase local circulation device is installed on the other side.

[0030] The method of using the above device is as follows:

[0031] First, use the clamp to hang the parts and the corresponding hose fixing fixtures at the same time, and adjust the angle of the hose fixing fixture so that the end of the liquid phase flow pipeline at the fixture angle is close to the air bag position. Then, according to the number of parts, hang the corresponding number of triangular roller accessories on the integrated bar, and clamp the hose with a wall thickness of 2mm between the triangular roller and the shell. Connect the conveying hose to the hose fixing fixture. After the installation is completed, the part is put into the tank. Turn on the motor and adjust the appropriate speed to allow the liquid to be injected into the air bag to eliminate the air bags at the blind holes, inner cavities and concave surfaces of the parts. Turn on the gas phase local stirring device and use bubble agitation to stir to eliminate the concentration differences of the electrolyte in different places. When ready, turn on the current diversion device, adjust the current to make the power lines evenly distributed, observe the processing time and tank temperature, and carry out the anodizing process.

[0032] The hose fixture is designed based on the air pocket location of the custom-shaped part. It connects to a liquid delivery hose to further transport the liquid to the vicinity of the air pocket, assisting the localized liquid circulation system. The design of the hose fixture varies depending on the part's structure. Resin insulation is preferred to avoid disrupting the distribution of electric field lines during electrochemical machining.

[0033] The advantages of this application are:

[0034] The present invention utilizes the squeezing force between the triangular rollers and the outer shell of the liquid-phase local circulation device to deliver electrolyte to the air pocket location, eliminating air pockets in blind holes, cavities, and concave surfaces of irregularly shaped parts. The gas-phase local stirring device utilizes bubbles to agitate the electrolyte, accelerating solute mass transfer and achieving a uniform electrolyte concentration. The current density control device improves the distribution of electric field lines, ensuring a uniform conversion coating on the part surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of an electrolytic oxidation surface treatment device;

[0036] Figure 2 Schematic top view of an electrolytic oxidation surface treatment device;

[0037] Figure 3 It is a schematic diagram of the liquid phase local circulation device;

[0038] Figure 4 Schematic diagram of the gas phase local stirring device;

[0039] Figure 5 (a) is a schematic diagram of the current density control device, and (b) is a schematic diagram of the circuit connection;

[0040] Figure 6 Schematic diagram of a hose fixing fixture for a part with a blind hole;

[0041] Figure 7 Schematic diagram of hose fixing fixture for parts with deep holes;

[0042] Figure 8 A schematic diagram of a hose fixing fixture for a part with a groove;

[0043] Among them, 1-1 variable frequency speed regulating motor, 1-2 rotating shaft, 1-3 shell, 1-4 triangular roller, 1-5 integrated lever, 1-6 conveying hose, 2-1 diverter pipe, 2-2 diverter valve, 2-3 flow meter. DETAILED DESCRIPTION

[0044] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0045] Example 1: Hard anodizing of blind hole parts

[0046] First, use the fixture to fix the parts and the corresponding hose (such as Figure 6 ) for installation and hanging, and the corresponding hose fixing tool has the function of conveying the liquid flow into the blind hole. Adjust the angle of the hose fixing tool so that the end of the liquid phase flow pipeline at the tooling angle is close to the air bag position. Then, according to the number of parts, hang the corresponding number of triangular roller accessories on the integrated bar, and clamp the hose with a wall thickness of 2mm between the triangular roller and the outer shell. Connect the conveying hose to the hose fixing tool, and after the installation is completed, the part is put into the slot. Turn on the motor and adjust the appropriate speed to inject the liquid into the air bag to eliminate the air bags at the blind holes, inner cavities and concave surfaces of the parts. Turn on the gas phase local stirring device and use bubble agitation to stir to eliminate the concentration differences of the electrolyte in different places. After preparation, turn on the current diversion device, adjust the current to make the power lines evenly distributed, observe the processing time and tank temperature, and carry out the hard anodizing process.

[0047] Example 2: Sulfuric acid anodizing of parts with deep holes on both sides

[0048] First, use the fixture to fix the parts and the corresponding hose (such as Figure 7 ) for installation and hanging, the corresponding hose fixing tool has the function of dividing the liquid flow into two fluid paths, and has two liquid phase pipeline ends. Adjust the angle of the hose fixing tool so that the end of the liquid phase flow pipeline at the tooling angle is close to the air bag position. Then, according to the number of parts, a corresponding number of triangular roller accessories are installed on the integrated bar, and the hose with a wall thickness of 2mm is clamped between the triangular roller and the outer shell. Connect the conveying hose to the hose fixing tool, and after the installation is completed, the part is put into the tank. Turn on the motor and adjust the appropriate speed to inject the liquid into the air bag to eliminate the air bags at the blind holes, inner cavities and concave surfaces of the parts. Turn on the gas phase local stirring device and use bubble agitation to stir to eliminate the concentration differences of the electrolyte in different places. After preparation, turn on the current diversion device, adjust the current to make the power lines evenly distributed, observe the processing time and tank temperature, and carry out the sulfuric acid anodizing process.

[0049] Example 3: Hard anodizing of parts with four-sided grooves

[0050] First, use the fixture to fix the parts and the corresponding hose (such as Figure 8) for installation and hanging, and the corresponding hose fixing fixture is ring-shaped, which divides the liquid flow into four fluid paths with four liquid phase pipeline ends. Adjust the angle of the hose fixing fixture so that the end of the liquid phase flow pipeline at the fixture angle is close to the air bag position. Then, according to the number of parts, a corresponding number of triangular roller accessories are installed on the integrated bar, and the hose with a wall thickness of 2mm is clamped between the triangular roller and the outer shell. Connect the conveying hose to the hose fixing fixture, and after the installation is completed, the part is put into the slot. Turn on the motor and adjust the appropriate speed to inject the liquid into the air bag to eliminate the air bags at the blind holes, inner cavities and concave surfaces of the parts. Turn on the gas phase local stirring device and use bubble agitation to stir to eliminate the concentration differences of the electrolyte in different places. After preparation, turn on the current diversion device, adjust the current to make the power lines evenly distributed, observe the processing time and tank temperature, and carry out the hard anodizing process.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art may make various modifications or substitutions within the technical scope disclosed in the present invention, and all such modifications or substitutions shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. An electrolytic oxidation surface treatment device, characterized in that: It includes a tank body, a liquid phase local circulation device, a gas phase local stirring device, and a current density control device; The liquid phase local circulation device is arranged on one side of the tank body, and the gas phase local stirring device and the current density control device are arranged on the other side of the tank body.

2. The electrolytic oxidation surface treatment device according to claim 1, characterized in that The liquid phase local circulation device comprises a variable frequency speed regulating motor (1-1), a rotating shaft (1-2), a housing (1-3), a triangular roller (1-4), an integrated lever (1-5), and a conveying hose (1-6); The rotating shaft (1-2) is gear-shaped; The housing (1-3) is square, with a circular hollow shape in the middle and a through hole in the upper right corner; The triangular roller (1-4) is manufactured by integrated laser selective melting of three circular wheels (1-4-1) and a central disc (1-4-2); the central position of the central disc (1-4-2) has a hole that matches the rotating shaft (1-2); the circular wheel (1-4-1) is an inscribed circle of the hollow circle of the outer shell; after installation, there is a 2mm gap between the circular wheel (1-4-1) and the outer shell (1-3); and the material of the titanium alloy is used to prevent corrosion; The triangular roller (1-4) has the same thickness as the housing (1-3) and forms an independent and detachable component after installation; The integrated lever (1-5) is fixed to the variable frequency speed regulating motor (1-1) and the trough body, and can pass through the through hole at the upper right corner of the housing (1-3). The housing (1-3) can be fixed by the integrated lever (1-5); The delivery hose (1-6) delivers the electrolyte to the air bag position so that the liquid phase local circulation area is close to the blind hole, inner cavity and concave surface of the part, thereby achieving air bag elimination.

3. The electrolytic oxidation surface treatment device according to claim 1, characterized in that The gas phase local stirring device comprises a diverter pipe (2-1), a diverter valve (2-2), and a flow meter (2-3); The flow meter (2-3) can control the flow of compressed air; The diverter valve (2-2) can control whether gas passes through the diverter pipe (2-1); The diverter pipe (2-1) transports gas to achieve bubble agitation and stirring; One diverter valve (2-2) controls one diverter pipe (2-1), and one flow meter (2-3) can control multiple diverter valves (2-2); The flow meter (2-3) is connected to a compressed air source.

4. The electrolytic oxidation surface treatment device according to claim 1, characterized in that The current density control device is a current distributor with multiple outputs including an external power supply; The current density control device is connected with an anode lead plate and a cathode lead tube.

5. The electrolytic oxidation surface treatment device according to claim 4, characterized in that: The anode lead plates may be multiple pieces connected in series; The cathode lead tubes are multiple and connected in parallel.

6. The electrolytic oxidation surface treatment device according to claim 5, characterized in that: The positive pole of the current density control device is connected to multiple parallel parts; the negative pole of the current density control device is sequentially connected to multiple anode lead plates in series and multiple cathode lead tubes in parallel; and the current loop is realized in conjunction with the electrolyte in the tank body.

7. The electrolytic oxidation surface treatment device according to claim 6, characterized in that: Parts can be placed crosswise with the cathode lead tube to eliminate the difference in conversion film thickness on the surface of the parts caused by uneven distribution of electric lines.

8. The electrolytic oxidation surface treatment device according to claim 7, characterized in that: The part has at least one of a deep blind hole, a cavity, or a groove.

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