A micro-arc oxidation reaction tank for the surface of a large workpiece

Abstract

A micro-arc oxidation reaction tank for large workpiece surfaces is characterized by the following: the oxidation reaction tank includes a tank body, which is a cylindrical structure with an open top. The upper end of the tank body extends horizontally outward to form an annular upper edge that serves as a support platform. A rotating disk is provided at the upper end of the upper edge. A motor for driving the rotating disk is provided on the side of the tank body. A detachable cathode plate is connected to the lower end of the rotating disk. The cathode plate is inserted into the tank body and can rotate with the rotating disk. This utility model has a reasonable structure, improving the traditional fixed cathode to a detachable and rotatable one, effectively solving the problems of uneven oxide film growth and difficult electrode cleaning. This makes the electrolyte distribution in the reaction tank more uniform, improves the uniformity of the oxide film in the asymmetric area of ​​the workpiece, and the detachable electrode makes cleaning convenient, greatly improving production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of metal surface treatment technology, and relates to a micro-arc oxidation reaction tank for the surface of a large workpiece. Background Technology

[0002] Surface treatment of valve metals such as aluminum, magnesium, and titanium, and their alloys, often employs anodizing and micro-arc oxidation processes. Micro-arc oxidation, also known as plasma electrolytic oxidation, is developed based on ordinary anodizing. Both surface treatment processes can form a dense oxide film on the surface of light alloy metals, improving the metal's corrosion resistance and wear resistance. These two surface treatment processes are simple and have broad application prospects in aerospace, machinery, electronic decoration, and other fields.

[0003] Existing micro-arc oxidation and anodizing technologies for oxidation tanks have the following problems: the electrolyte in ordinary large reaction tanks is usually in a static or partially static state, which easily leads to uneven heat accumulation and electrolyte distribution on the surface of the sample to be treated, affecting the uniform growth of the oxide film; in order to obtain a relatively uniform electric field distribution, large-area plates are usually used as cathodes of large reaction tanks. Under long-term operation, mineralization, scaling or corrosion are prone to occur on the surface of the plates. Especially for electrolytes with added nanoparticles, the cleaning workload of large-area electrodes is huge, which seriously affects production efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a micro-arc oxidation reaction tank for the surface of large workpieces with reasonable structure and uniform oxidation. The traditional fixed cathode is improved to be detachable and rotatable, so that the electrolyte is evenly distributed and the electrode is easy to replace and clean.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a micro-arc oxidation reaction tank for the surface of a large workpiece, characterized in that: the oxidation reaction tank includes a tank body, which is a cylindrical structure with an open top. The upper end of the tank body extends horizontally outward to form an annular upper edge that serves as a bearing platform. A rotating disk is provided at the upper end of the upper edge. A motor for driving the rotating disk to rotate is provided on the side of the tank body. A detachable cathode plate is connected to the lower end of the rotating disk. The cathode plate is inserted into the tank body and can rotate with the rotating disk.

[0006] As an improvement, the upper edge of the tank is provided with an annular support block, the rotating disk is rotatably mounted on the support block, the motor is mounted on the outer side of the upper end of the tank, and the motor is connected to the rotating disk through a transmission mechanism.

[0007] Furthermore, a motor platform is provided on one side of the upper end of the groove, and the motor is vertically fixed on the motor platform. The transmission mechanism includes a transmission gear, and a gear shaft and a gear bracket are provided on the motor platform. The transmission gear is installed on the gear shaft and meshes with the output gear at the upper end of the motor. The other end of the transmission gear meshes with the tooth surface formed on the outer circumference of the rotating disk.

[0008] Furthermore, the rotating disk is annular, with a downwardly extending lower edge on the inner side of the rotating disk. The lower end face of the rotating disk near the outer side is a thickened counterweight block, which is located above the bearing block. The toothed surface is set on the outer circumference of the counterweight block, and ball bearings are arranged between the counterweight block and the bearing block to facilitate the rotation of the rotating disk.

[0009] Furthermore, the lower end face of the counterweight is recessed with two semi-circular upper ball grooves, and the upper end face of the bearing block is recessed with two corresponding semi-circular lower ball grooves. The balls are distributed in the annular channel formed by the upper and lower ball grooves.

[0010] Furthermore, the rotating disk has several sets of cathode fixing holes evenly spaced along its lower and upper circumferences. The cathode plate is a curved strip plate with corresponding bolt holes at its upper end. The cathode plates are evenly spaced along the circumference, and the upper end of the cathode plate is connected to the lower edge of the rotating disk by bolts.

[0011] Furthermore, the number of cathode fixing holes is an even number greater than or equal to 6, with each group consisting of two holes, one on the top and one on the bottom, and the radius of the arc of the cathode plate being the same as the inner radius of the lower edge.

[0012] Furthermore, the outer edge of the bearing block is provided with an annular limiting block, the height of which is not lower than the upper end face of the rotating disk, and the limiting block has a notch on the side corresponding to the motor for the transmission gear to pass through.

[0013] Finally, the limiting block and the bearing block are integrated into one piece, the tank, motor platform, bearing block and limiting block are made of insulating materials, the rotating disk is made of stainless steel or titanium alloy, the ball is made of ceramic ball, and the cathode plate is made of stainless steel or graphite.

[0014] Compared with the prior art, the advantages of the present invention are as follows:

[0015] 1. The cathode plate is detachable, and the cathode plate can be added or removed according to the shape of the workpiece, which improves the efficiency of cathode plate replacement and saves the workload of electrode replacement and cleaning.

[0016] 2. A rotating disk is installed on the tank, and the cathode plate is connected to the rotating disk. This allows the cathode plate to rotate, which plays a stirring role. The rotating cathode plate can make the electrolyte in the reaction tank form a vortex, making the electrolyte distribution in the reaction tank more uniform.

[0017] 3. Under normal circumstances, the workpiece being processed is a non-centrosymmetric workpiece. A rotating cathode plate can obtain a uniform electric field with a small area cathode plate, which can improve the uniformity of the oxide film in the asymmetric region of the workpiece.

[0018] This utility model has a reasonable structure, improving the traditional fixed cathode to a detachable and rotatable one, effectively solving the problems of uneven oxide film growth and difficult electrode cleaning. It makes the electrolyte distribution in the reaction tank more uniform, improves the uniformity of the oxide film in the asymmetric area of ​​the workpiece, and the detachable electrode makes cleaning convenient, greatly improving production efficiency. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0020] Figure 2 yes Figure 1 A sectional view;

[0021] Figure 3 This is a structural diagram of the load-bearing block and the limiting baffle;

[0022] Figure 4 This is a schematic diagram of the structure after the rotating disk and cathode plate are assembled. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figures 1-4 As shown, a micro-arc oxidation reaction tank for a large workpiece surface includes a tank body 1, which is a cylindrical structure with an open top. The upper end of the tank body 1 extends horizontally outward to form an annular upper edge 11 that serves as a support platform. A rotating disk 2 is provided at the upper end of the upper edge 11. A motor 3 for driving the rotating disk 2 to rotate is provided on the side of the tank body 1. A detachable cathode plate 6 is connected to the lower end of the rotating disk 2. The cathode plate 6 is inserted into the tank body 1 and can rotate with the rotating disk 2.

[0025] The specific structure is as follows: a ring-shaped support block 4 is provided at the upper end of the upper edge 11 of the tank body 1, and the rotating disk 2 is rotatably mounted on the support block 4. A motor platform 30 is provided on one side of the upper end of the tank body 1, and the motor 3 is vertically fixed on the motor platform 30 and connected to the rotating disk 2 through a transmission mechanism.

[0026] The transmission mechanism includes a transmission gear 7. A gear shaft 70 and a gear bracket 71 are provided on the motor platform 30. The transmission gear 7 is mounted on the gear shaft 70 and meshes with the output gear 31 at the upper end of the motor 3. The other end of the transmission gear 7 meshes with the tooth surface 23 formed on the outer circumference of the rotating disk 2.

[0027] The rotating disk 2 is annular, with a downwardly extending lower edge 21 on its inner side. The lower end face of the rotating disk 2, near the outer side, is a thickened counterweight 22, positioned above the supporting block 4. A toothed surface 23 is located on the outer circumference of the counterweight 22. Balls 8 are arranged between the counterweight 22 and the supporting block 4 to facilitate the rotation of the rotating disk 2. The lower end face of the counterweight 22 has two concave semi-circular upper ball grooves 221, and the upper end face of the supporting block 4 has two corresponding semi-circular lower ball grooves 41. The balls 8 are distributed within the annular channels formed by the corresponding upper and lower ball grooves 221 and 41. The rotating disk 2 has several sets of cathode fixing holes 211 evenly spaced along its upper circumference at the lower edge 21. The number of sets of cathode fixing holes 211 is an even number greater than or equal to 6. Each set of cathode fixing holes 211 consists of two holes, one at the top and one at the bottom. The cathode plate 6 is a curved strip plate with two corresponding bolt holes at its upper end. The cathode plates 6 are evenly spaced along the circumference, and their upper ends are connected to the lower edge 21 of the rotating disk 2 by bolts. In this embodiment, there are 6 sets of cathode fixing holes 211 and 3 cathode plates 6, arranged at 120° intervals around the axis of the groove 1. The radius of the arc of the cathode plate 6 is the same as the inner radius of the lower edge 21.

[0028] The outer edge of the bearing block 4 is provided with an annular limiting block 5. The limiting block 5 and the bearing block 4 are integral parts. The height of the limiting block 5 is not lower than the upper end face of the rotating disk 2. In this embodiment, the height of the limiting block 5 is consistent with the height of the upper end face of the rotating disk 2. The limiting block 5 is provided with a notch 51 on the side corresponding to the motor 3 for the transmission gear 7 to pass through.

[0029] The tank 1, motor platform 30, bearing block 4, and limit stop 5 are made of PP insulating material; the rotating disk 2 and bolt 9 are made of stainless steel; the ball bearing 8 is an alumina ceramic ball bearing; the transmission gear 7 is an alumina ceramic gear; and the cathode plate 6 is made of stainless steel or graphite.

[0030] The working principle and usage process are as follows:

[0031] First, assemble the oxidation tank, then perform surface oxidation following the steps of preparation → oxidation → oxidation completion.

[0032] Preparation work includes: preparing a suitable electrolyte, pouring the electrolyte into the tank 1 to the appropriate level, then connecting the negative electrode of the micro-arc oxidation power supply to the rotating disk 2, then immersing the workpiece to be treated in the electrolyte, and connecting the workpiece to be treated to the positive electrode of the arc oxidation power supply.

[0033] Oxidation includes: first, turning on the motor 3, causing the output gear 31 to drive the transmission gear 7 to rotate, the transmission gear 7 to drive the rotating disk 2 to rotate on the support block 4, and then driving the cathode plate 6 to rotate in the tank 1. When the electrolyte inside the tank 1 forms a vortex, the micro-arc oxidation power supply is turned on to start oxidation.

[0034] The oxidation process includes: first, turning off the micro-arc oxidation power supply, then turning off motor 3, and after the cathode plate 6 has completely stopped rotating, removing the workpiece to complete the oxidation.

[0035] In this invention, the replacement steps for the cathode plate 6 are as follows: unscrew the bolt 9, remove the contaminated cathode plate 6, and then reinstall the new cathode plate 6 to achieve rapid replacement of the cathode plate 6.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A micro-arc oxidation reaction tank for the surface of a large workpiece, characterized in that: The oxidation reaction tank includes a tank body, which is a cylindrical structure with an open top. The upper end of the tank body extends horizontally outward to form an annular upper edge that serves as a support platform. A rotating disk is provided at the upper end of the upper edge. A motor for driving the rotating disk is provided on the side of the tank body. A detachable cathode plate is connected to the lower end of the rotating disk. The cathode plate is inserted into the tank body and can rotate with the rotating disk.

2. The micro-arc oxidation reaction tank for large workpiece surfaces according to claim 1, characterized in that: The upper edge of the trough is provided with an annular support block, and the rotating disk is rotatably mounted on the support block. The motor is located on the outer side of the upper end of the trough and is connected to the rotating disk through a transmission mechanism.

3. The micro-arc oxidation reaction tank for large workpiece surfaces according to claim 2, characterized in that: A motor platform is provided on one side of the upper end of the trough. The motor is vertically fixed on the motor platform. The transmission mechanism includes a transmission gear. A gear shaft and a gear support are provided on the motor platform. The transmission gear is installed on the gear shaft and meshes with the output gear at the upper end of the motor. The other end of the transmission gear meshes with the tooth surface formed on the outer circumference of the rotating disk.

4. The micro-arc oxidation reaction tank for large workpiece surfaces according to claim 3, characterized in that: The rotating disk is circular, with a downwardly extending lower edge on the inner side. The lower end face of the rotating disk near the outer side is a thickened counterweight block, which is located above the support block. The toothed surface is set on the outer circumference of the counterweight block, and ball bearings are arranged between the counterweight block and the support block to facilitate the rotation of the rotating disk.

5. The micro-arc oxidation reaction tank for large workpiece surfaces according to claim 4, characterized in that: The lower end face of the counterweight is recessed with two semi-circular upper ball grooves, and the upper end face of the bearing block is recessed with two corresponding semi-circular lower ball grooves. The balls are distributed in the annular channel formed by the upper and lower ball grooves.

6. The micro-arc oxidation reaction tank for large workpiece surfaces according to claim 5, characterized in that: The rotating disk has several sets of cathode fixing holes evenly spaced along its lower and upper circumference. The cathode plate is a curved strip plate with corresponding bolt holes at its upper end. The cathode plates are evenly spaced along the circumference, and the upper end of the cathode plate is connected to the lower edge of the rotating disk by bolts.

7. The micro-arc oxidation reaction tank for large workpiece surfaces according to claim 6, characterized in that: The number of cathode fixing holes is an even number greater than or equal to 6. Each group of cathode fixing holes consists of two holes, one at the top and one at the bottom. The radius of the arc of the cathode plate is the same as the radius of the inner circle at the bottom edge.

8. The micro-arc oxidation reaction tank for large workpiece surfaces according to claim 7, characterized in that: The outer edge of the bearing block is provided with an annular limiting block. The height of the limiting block is not lower than the upper end face of the rotating disk. The limiting block has a notch on the side corresponding to the motor for the transmission gear to pass through.

9. The micro-arc oxidation reaction tank for large workpiece surfaces according to claim 8, characterized in that: The limiting block and the bearing block are integrated into one piece. The groove, motor platform, bearing block and limiting block are made of insulating materials. The rotating disk is made of stainless steel or titanium alloy. The ball bearings are ceramic ball bearings. The cathode plate is made of stainless steel or graphite.

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