Micro-arc oxidation tank

Abstract

The micro-arc oxidation tank comprises an outer tank, an inner tank, an electric cabinet and a plurality of electrode bars, the inner tank is arranged in the outer tank, the bottom of the inner tank is sealed, a sealed interlayer used for containing cooling water is arranged between the inner tank and the outer tank, and the electrode bars are distributed in the center and on the inner wall of the inner tank. And the electric cabinet is connected with the electrode bar and inputs voltage sources with different frequencies or phases to the electrode bar. According to the utility model, voltage sources with different frequencies or phases can be input to each electrode bar according to different micro-arc requirements, so that periodic signals with different duty ratios can be obtained by inputting sinusoidal quantities with different frequencies, better oxidation is realized, and the surface hardness of the magnesium alloy hub is improved.

Description

Technical Field

[0001] This utility model relates to micro-arc oxidation technology on the surface of magnesium alloy wheel hubs, and particularly to a micro-arc oxidation groove. Background Technology

[0002] Micro-arc oxidation (MAO) primarily relies on the matching and adjustment of electrolyte and electrical parameters. Under the instantaneous high temperature and pressure generated by arc discharge, a modified ceramic coating, mainly composed of base metal oxides and supplemented with electrolyte components, is grown on the surface of valve metals such as aluminum, magnesium, and titanium and their alloys. Its corrosion resistance and wear resistance are significantly superior to traditional anodic oxidation coatings, and its application in components has attracted widespread attention. During MAO, chemical oxidation, electrochemical oxidation, and plasma oxidation occur simultaneously, making the formation process of the ceramic layer extremely complex.

[0003] Currently, micro-arc oxidation for surface ceramicization faces several challenges. Firstly, the high energy consumption per unit area during micro-arc oxidation limits the area of ​​the workpiece that can be processed. It is primarily used for small parts or flat plates, and there is no mature method for treating large components like wheel hubs. Secondly, the irregular influence of discharge parameters on the oxide film's microstructure and the unclear mechanism of the electrolyte system's influence on the micro-arc process mean that the structural changes in micro-arc oxidation are affected by multiple factors. To obtain a high-quality oxide film, the electrical parameters required differ in the initial, middle, and later stages of micro-arc oxidation. Adjusting these parameters can optimize the microstructure; for example, controlling the discharge spark can result in a film with good surface roughness. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a micro-arc oxidation groove to improve the surface hardness of magnesium alloy wheel hubs.

[0005] To achieve the above objectives, the specific solution of this utility model is as follows:

[0006] A micro-arc oxidation tank includes an outer tank, an inner tank, an electrical control box, and several electrode rods. The inner tank is located inside the outer tank and is sealed at the bottom. There is a sealed interlayer between the inner tank and the outer tank for accommodating cooling water. The electrode rods are distributed in the center and on the inner wall of the inner tank. The electrical control box is connected to the electrode rods and inputs voltage sources of different frequencies or phases to the electrode rods.

[0007] Preferably, the electrode rods in the center of the inner groove are arranged in an array, and the electrode rods on the inner wall of the inner groove are evenly distributed.

[0008] Preferably, the cross-section of the inner groove is circular or square.

[0009] Preferably, one end of the electrode rod is provided with a contact for connecting to the electrical control box, and the contact is located at the bottom of the outer tank.

[0010] Preferably, the inner wall of the inner tank is further provided with a first temperature sensor and a liquid level sensor.

[0011] Preferably, the outer wall of the outer tank is provided with a water supply device, a water supply pipe, a water level observation window, and a second temperature sensor.

[0012] Preferably, the bottom of the micro-arc oxidation tank is further provided with a support, which includes a support part and a worktable.

[0013] Preferably, the electrical control box is equipped with a control panel.

[0014] Preferably, the micro-arc oxidation tank further includes a cooler, which is connected to the outer tank.

[0015] Preferably, the cooler includes a circulation pump, heat sinks, and a fan, and the cooler and the outer tank are connected via the circulation pump.

[0016] The technical solution of this utility model has the following beneficial effects:

[0017] This invention allows for the input of voltage sources of different frequencies or phases to each electrode rod according to different micro-arc requirements. By inputting sinusoidal quantities of different frequencies, periodic signals with different duty cycles can be obtained, achieving better oxidation and thus improving the surface hardness of the magnesium alloy wheel hub. Simultaneously, it can collect electrolyte temperature data in real time, effectively controlling the electrolyte temperature, reducing energy loss, and improving heating efficiency. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the present invention from another perspective.

[0020] Among them, 1-outer tank, 2-water supply pipe, 3-water level observation window, 4-water supply device, 5-inner wall electrode rod, 6-liquid level sensor, 7-first temperature sensor, 8-inner tank, 9-central electrode rod, 10-cooler, 11-circulation pump, 12-control panel, 13-workbench, 14-electrical control box, 15-central contact, 16-inner wall contact, 17-support part, 18-fan, 19-heat sink, 20-second temperature sensor. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] Reference Figures 1 to 2This utility model provides a micro-arc oxidation tank, including an outer tank 1, an inner tank 8, an electrical control box 14, and a plurality of electrode rods. The inner tank 8 is located inside the outer tank 1 and is sealed at the bottom, and there is a sealed interlayer between the inner tank 8 and the outer tank 1 for accommodating cooling water. The electrode rods are distributed in the center and on the inner wall of the inner tank 8, namely a central electrode rod 9 and an inner wall electrode rod 5, respectively. The electrical control box 14 is connected to the electrode rods and inputs voltage sources of different frequencies or phases to each electrode rod.

[0023] The central electrode rods 9 are arranged in an array, and the inner wall electrode rods 5 are evenly distributed on the inner wall of the inner groove 8. One end of the central electrode rod 9 is provided with a central contact 15 connected to the electrical control box 14, and one end of the inner wall electrode rod 5 is provided with an inner wall contact 16 connected to the electrical control box 14. The central contact 15 and the inner wall contact 16 are both located at the bottom of the outer groove 1.

[0024] The inner tank 8 has a circular cross-section and is made of a high-temperature resistant, non-conductive material. A first temperature sensor 7 and a liquid level sensor 6 are also installed on the inner wall of the inner tank 8.

[0025] The micro-arc oxidation tank also includes a cooler 10, which includes a circulation pump 11, a heat sink 19 and a fan 18. The cooler 10 and the outer tank 1 are connected by the circulation pump 11. The outer wall of the outer tank 1 is provided with a water supply device 4, a water supply pipe 2, a water level observation window 3 and a second temperature sensor 20.

[0026] The bottom of the micro-arc oxidation tank is also provided with a support, which includes a support part 17 and a worktable 13. The electrical control box 14 is provided with a control panel 12.

[0027] The working principle of this utility model is as follows:

[0028] The magnesium alloy wheel hub is placed in a micro-arc oxidation tank. Depending on the specific micro-arc requirements, voltage sources of different frequencies or phases are input to each electrode rod via the electrical control box 14 to perform micro-arc operations on the wheel hub surface. By inputting sinusoidal signals of different frequencies, periodic signals with different duty cycles can be obtained, achieving better oxidation. Simultaneously, cooling water is injected into the interlayer between the inner tank 1 and the outer tank 8 through the water replenisher 4 and water replenishment pipe 2. The heated cooling water is then pumped out by the circulation pump 11, cooled by the cooler 10, and returned to the interlayer. The liquid level sensor 6 and the first temperature sensor 7 in the inner tank 8 are used to monitor the height and temperature of the electrolyte in the inner tank 8 in real time. The water level observation window 2 and the second temperature sensor 20 on the outside of the outer tank 1 are used to monitor the height and temperature of the cooling water in the interlayer in real time. The water replenisher 4 and water replenishment pipe 2 can achieve automatic water replenishment, ensuring that the cooling water is maintained at the set water level. The automatic water replenishment process uses existing technology and will not be described in detail here.

[0029] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the protection scope of the present utility model.

Claims

1. A micro-arc oxidation tank, characterized in that, It includes an outer tank, an inner tank, an electrical control box, and several electrode rods. The inner tank is located inside the outer tank and is sealed at the bottom. There is a sealed interlayer between the inner tank and the outer tank to accommodate cooling water. The electrode rods are distributed in the center and on the inner wall of the inner tank. The electrical control box is connected to the electrode rods and inputs voltage sources of different frequencies or phases to the electrode rods.

2. The micro-arc oxidation tank according to claim 1, characterized in that, The electrode rods in the center of the inner groove are arranged in an array, and the electrode rods on the inner wall of the inner groove are evenly distributed.

3. The micro-arc oxidation tank according to claim 1, characterized in that, The cross-section of the inner groove is circular or square.

4. The micro-arc oxidation tank according to claim 1, characterized in that, One end of the electrode rod is provided with a contact point for connecting to the electrical control box, and the contact point is located at the bottom of the outer tank.

5. The micro-arc oxidation tank according to claim 1, characterized in that, The inner wall of the inner tank is also equipped with a first temperature sensor and a liquid level sensor.

6. The micro-arc oxidation tank according to claim 1, characterized in that, The outer wall of the outer tank is equipped with a water supply device, a water supply pipe, a water level observation window, and a second temperature sensor.

7. The micro-arc oxidation tank according to claim 1, characterized in that, The bottom of the micro-arc oxidation tank is also provided with a support, which includes a support part and a worktable.

8. The micro-arc oxidation tank according to claim 1, characterized in that, The electrical control box is equipped with a control panel.

9. The micro-arc oxidation tank according to any one of claims 1-8, characterized in that, The micro-arc oxidation tank also includes a cooler, which is connected to the outer tank.

10. The micro-arc oxidation tank according to claim 9, characterized in that, The cooler includes a circulation pump, heat sinks, and a fan, and the cooler and the outer tank are connected via the circulation pump.

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