KR101884148B1 - Anodizing apparatus - Google Patents

Abstract

The present invention relates to an anodizing apparatus capable of improving the quality of an oxide film. According to the present invention, the anodizing apparatus comprises: a bath unit to receive an electrolyte and to form a space for performing anodizing while a material to be anodized is immersed in the electrolyte; a support unit supporting a jig for fixing an anodization material to be immersed in the electrolyte; a plurality of check valves arranged and disposed on the bottom surface of the bath unit at predetermined intervals, and allowing a fluid to communicate with the inside of the bath unit; and one or more microbubble supply units to supply the electrolyte including microbubbles to each check valve through flow path pipes.

Description

Anodizing apparatus,

The present invention relates to an anodizing apparatus, and more particularly, to an anodizing apparatus capable of improving the quality of an oxide film.

Aluminum (Al) material is high in dimensional precision and can be mass-produced in a shorter time than iron in the production of lightweight castings. They are also widely used in a variety of industries due to their high castability, low density, high productivity, low shrinkage and relatively high strength.

Aluminum uses range from transportation equipment such as aircraft, railway and automobiles to electricity, electronics, and general machinery. Specifically, it is widely used in cases such as a transmission housing, an engine cylinder and a block, a fuel measuring device, and the like, and a component of a transportation device having a complicated shape. Along with the development of the IT industry, aluminum is also widely used in cases of portable electronic devices such as portable computers, tablet PCs and smart phones.

Despite these advantages and various applicability, aluminum needs to be improved in corrosion resistance and reliability, since corrosion may occur in less severe environments, resulting in deterioration of mechanical properties.

Methods for improving the disadvantages of aluminum include a method of using aluminum as an alloy by adding elements such as Mn, Mg, Si, and Cr, an anodizing method of producing an artificial anodic oxide coating on the surface of aluminum alloy, A chromate coating method and a phosphate coating treatment method which produce a chemical conversion coating capable of conducting electricity. Of these, the anodizing method can be considered as a method having a high functionality for forming a protective coating of an aluminum alloy material.

The anodizing method includes the acid method, the sulfuric acid method, and the chromic acid method depending on the type of electrolyte used in the electrolysis. Aluminum oxide (Al2O3) film is formed by oxidizing the surface of aluminum by the oxygen generated from the anode by applying the direct current power with the aluminum material which is to be surface-treated as the anode. This film is very hard, And is formed into a porous structure having a very small diameter. The higher the purity of aluminum, the more beautiful and glossy the coating can be obtained.

However, in the case of anodizing by the sulfuric acid method or the chromic acid method as described above, there is a phenomenon that a porous structure in which numerous fine pores are present in the oxide film layer formed on the aluminum surface is generated. Such a porous structure, Although it has advantages for coloring, it has a disadvantage in that it is not suitable for a product to be used for industrial use due to its poor mechanical, chemical and electrical characteristics. Therefore, a post-treatment process of a sealing process for filling micropores of the porous structure is indispensably required.

Since the oxygen generated by the electrolysis around the anode forms bubbles that are transferred to the atmosphere, the oxidizing function on the metal body is lowered and oxygen bubbling increases the resistance on the metal body surface and requires higher voltage for processing A large power is required and thus heat loss and energy loss are large.

In order to solve these problems, in Japanese Patent Application Laid-open No. 60-9600, a number of bubbles having a diameter of 0.001 to 4 mm are generated by an aeration apparatus in an electrolytic bath, And an efficiency of the anodizing process is improved. In addition, Korean Patent No. 10-0382177 entitled " Anodizing Treatment Method and Apparatus "discloses a technique for further vibrating a treatment bath .

However, when the vibration is generated due to the large size of the bubbles, or when the vibration is generated as described above, the fine pores of the oxide film may be excessively large.

The present invention provides an anodizing apparatus capable of improving the quality of an oxide film as compared with an anodizing apparatus of a vibrating type using vibration with a small vibration but using conventional ultrasonic waves.

An anodizing apparatus according to the present invention includes: a bass unit for accommodating an electrolytic solution and forming a space for carrying out anodizing in a state in which an object to be anodized is immersed in the electrolytic solution; A support for supporting the jig for fixing the anodizing material so as to be immersed in the electrolyte solution; A plurality of check valves arranged at regular intervals on a bottom surface of the bass portion and allowing fluid to flow into the bass portion; And at least one fine bubble supplying unit for supplying an electrolyte solution containing fine bubbles to each of the plurality of check valves through flow path pipes.

Further, the fine bubble supplying unit may supply the fine bubbles to the check valves sequentially, and at the same time, control the supply period of the fine bubbles and supply the electrolyte containing the fine bubbles discontinuously through the respective check valves.

The fine bubble supplying unit may control the supply order of the electrolyte containing fine bubbles through the uniformly arranged check valves to have a predetermined directionality.

The fine bubble supplying unit may include a housing which forms an outer shape and has a discharge flow passage radially passing through the center axis direction at a predetermined angle in a radial direction with respect to the central axis, ; A fine-bubble forming nozzle provided on an outlet side of the flow path; A plurality of pistons reciprocating in the direction of the central axis of the discharge passage; A rotating shaft provided in the housing center axis direction and rotated by receiving external power; And a swash plate fixed to the rotating shaft in an inclined state with respect to the central axis and rotating together with the rotating shaft to sequentially reciprocate each of the plurality of pistons.

The fine bubble forming nozzle may include a nozzle body formed into a hollow shape and inserted into the discharge passage; A flow control unit fixed to the inside of the nozzle body to control the air and the flow path of the electrolyte to form fine bubbles; And the micro-bubble forming nozzle may include a porous member for utilizing a capillary phenomenon on the inflow channel side.

The porous member may further include a rotating portion that rotates in accordance with the flow of the electrolytic solution on the inlet flow path side.

In addition, the flow control unit may include a protrusion formed so as to decrease in diameter in a direction opposite to the flow direction of the electrolyte from a point fixed to the nozzle body, and a protrusion is formed inside the protrusion from a point fixed to the nozzle body Wherein a bubble forming space defined by a predetermined depth of space is formed and a flow path switching hole for communicating a space between the nozzle body and the bubble forming space is formed and the flow path switching hole is formed so as to be opposed to the flow direction of the electrolyte and air The flow control unit may be formed to be inclined with respect to the center axis of the flow control unit.

The flow control unit may include a first path formed between the protruding portion and the nozzle body portion, a second path leading to the bubble forming space through the flow path switching hole, and a second path extending from the bubble forming space to the discharge side The third path can be formed.

Also, the flow path control unit may be formed such that the diameter of the flow path formed along the third path gradually increases.

In addition, the flow control unit can form fine bubbles by colliding the movement of the electrolyte and the air through the second path and the movement of the electrolyte and the air through the third path.

According to the present invention, fine bubbles can be discretely pulsed at a specific position, that is, by discontinuously supplying the minute bubbles at a specific position, without using a separate vibration inducing device, An anodizing apparatus capable of improving the quality of an oxide film as compared with an anodizing apparatus is provided.

1 and 2 are schematic views for explaining an anodizing apparatus according to the present invention.
FIGS. 3 to 4 are a perspective view, a cross-sectional view, and an exploded perspective view, respectively, of a fine bubble supplying unit according to an embodiment.
6 is a schematic view for explaining piston-related constituent parts of the minute bubble supplying part.
7 is a cross-sectional view showing a micro-bubble forming nozzle according to an embodiment.
8 is a cross-sectional view showing a micro-bubble forming nozzle according to another embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the absence of special definitions or references, the terms used in this description are based on the conditions indicated in the drawings. The same reference numerals denote the same members throughout the embodiments. For the sake of convenience, the thicknesses and dimensions of the structures shown in the drawings may be exaggerated, and they do not mean that the dimensions and the proportions of the structures should be actually set.

An anodizing apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 and 2 are schematic views for explaining an anodizing apparatus according to the present invention.

As shown in FIG. 1, the anodizing apparatus 10 according to the present embodiment includes a bass unit 20 for accommodating an electrolyte solution and forming a space for anodizing in a state of immersing the material to be anodized in the electrolyte solution, And a support portion 21 for supporting the jig 25 for fixing the jig 25 so as to be immersed in the electrolyte solution. The jig 25 is fixed to the support via the fixing member 23.

Referring to FIG. 2, a plurality of check valves 29 are provided on the bottom surface of the bass unit 20. As shown in FIG. The check valves 29 allow the electrolytic solution in which minute bubbles are mixed to flow into the bass portion 20 from the minute bubble supplying portion, which will be described later, through individual hoses or pipe-type channel pipes.

The check valves 29 are arranged and provided at regular intervals on the bottom surface of the inner space of the bass portion 20. [ The fine bubble supplying unit, which will be described later, supplies fine bubbles to the check valves in sequence, and at the same time, controls the supply period of the fine bubbles and supplies the electrolyte containing the fine bubbles discontinuously through each check valve. At this time, the minute bubble supplying unit can control the electrolytic solution containing fine bubbles to be supplied with a certain direction through the check valves 29 arranged regularly.

Anodizing is an anodizing process in which a metal or a component is placed on an anode and electrolyzed in an electrolytic solution of a dilute acid to form an oxide film (aluminum oxide: Al 2 O 3) having a strong adhesion to the base metal by oxygen generated from the anode . Anodic oxidation is an anodizing of anode and oxidation. In addition, there is a difference from electroplating in which metal parts are plated on a negative electrode. The most typical material of the anodic oxidation is aluminum (Al), and anodizing is also performed on metallic materials such as magnesium (Mg), zinc (Zn), titanium (Ti), tantalum (Ta), hafnium (Hf), and niobium Processing. Anodizing on Aluminum Alloys, which treats the surface of aluminum materials on an anodic surface, is half-eroded and half of the aluminum surface is formed by electrolysis of aluminum on the anode. Aluminum anodizing (anodic oxidation) can form films with different properties depending on the composition and concentration of various electrolytic (processing) liquids, additives, electrolyte temperature, voltage, current and so on.

The anodizing apparatus 10 according to this embodiment omits these electric supply related apparatuses for convenience of explanation.

3 to 8, a micro-bubble supplying unit according to an embodiment will be described. FIGS. 3 to 4 are a perspective view, a cross-sectional view, and an exploded perspective view, respectively, of the fine bubble supplying unit according to the embodiment, and FIG. 6 is a schematic view for explaining the piston-related constituent units of the fine bubble supplying unit. 7 is a cross-sectional view showing a micro-bubble forming nozzle according to an embodiment, and Fig. 8 is a sectional view showing a micro-bubble forming nozzle according to another embodiment.

The fine bubble supplying unit 100 according to the present embodiment is an apparatus for supplying an electrolytic solution in which fine bubbles are mixed into a bubble portion. The fine bubble supplying unit 100 according to the present embodiment includes a housing 110, a rotating shaft 111, a supplying unit 190, a piston 130, and a fine bubble forming nozzle 120.

The housing 110 forms an outer shape of the fine bubble supplying part 100 and the housing 110 has the cylinder part 101 formed at a certain angle in the radial direction with respect to the central axis. The cylinder portion 101 passes through the housing 110 in the direction of the central axis. The inlet flow path 190 forms a flow path so that the electrolyte and air flow into the discharge flow path. At this time, the electrolytic solution and the air flowing through the inflow channel 190 may be supplied through separate tubes, but it is also possible to preliminarily mix and supply the electrolytic solution and the air through the pretreatment.

The fine bubble forming nozzle 120 is provided in the cylinder 101 and mixes the electrolyte and air discharged through the cylinder 101 to form fine bubbles. The piston 130 reciprocates in the direction of the central axis of the discharge passage. The piston 130 functions to push the electrolyte and air flowing into the cylinder portion 101 side through the inflow channel 190 toward the fine bubble forming nozzle 120 side.

The rotation shaft 111 is provided to penetrate in the direction of the center axis of the housing 110 and receives external power to rotate. A swash plate (112) is provided at the center of the rotating shaft (111). The swash plate 112 is fixed to the rotating shaft 111 in an inclined state with respect to the central axis and rotates together with the rotating shaft 111 to sequentially reciprocate each of the plurality of pistons 130. [

Specifically, as shown in FIG. 6, the piston 130 is formed with packing portions 131 at both ends thereof to form airtightness of the cylinder portion 101 described above. The connecting portion 135 connecting between the packing portions 131 has a stepped portion 1351 recessed to a predetermined depth to receive the side edge of the swash plate. As the rotary shaft 111 rotates, the edge portion of the swash plate 112 moves up and down in the central axis direction. At this time, the piston 130 also reciprocates along the swash plate 112 in the state that the edge of the swash plate is accommodated in the stepped portion 1351. On the other hand, as the swash plate 112 rotates, each piston 130 sequentially advances and retreats along the cylinder 101.

The fine bubble forming nozzle 120 includes a nozzle body part 120 and a flow path control part 121 as shown in FIG.

The nozzle body 120 is formed in a hollow shape and inserted into the discharge passage. The flow control unit 121 is fixed to the inside of the nozzle body 120 to form minute bubbles by controlling the flow paths of the air and the electrolyte.

The protrusion 1213 is formed so that the diameter of the flow control portion 121 decreases from the point 1211 fixed to the nozzle body portion 120 to the direction of the flow of the electrolyte solution, that is, the direction opposite to the discharge port 119 side.

A bubble forming space 1213 defined as a space having a predetermined depth in the direction of the central axis from the point 1211 fixed to the nozzle body 120 is formed on the inner side of the protrusion 1213. The protruding portion 1213 is formed with a flow path switching hole 1212 for communicating the bubble forming space 1213 from a point adjacent to the fixing point 1211 outside the protruding portion 1213. The flow path switching hole 1212 forms a flow path in the direction opposite to the direction of the discharge port 119 side. That is, the flow path switching hole 1212 may be formed to be inclined with respect to the central axis of the flow path control portion 121 so as to be opposite to the entire flow direction of the electrolyte and air.

The flow control unit 121 includes a first path st1 formed between the projecting portion and the nozzle body portion, a second path leading to the bubble forming space 1213 through the flow path switching hole 1212, a bubble forming space 1213 ) To the discharge port 119. In this case, In this case, the flow path control unit 121 may be formed such that the diameter of the flow path formed along the third path st3 gradually increases. The electrolyte solution and the air collide with the electrolyte and the air flowing into the bubble forming space 1213 through the second path 1212 to form bubbles in the bubble forming space 1213. The electrolyte solution The pressure is increased in the process of moving through the third path st3, so that the bubbles are made finer.

On the other hand, the porous member 123 is provided adjacent to the protrusion 1213. Even when the electrolyte solution and the air supplied to the flow control unit 121 are mixed before the introduction, the electrolytic solution is positioned on the lower side of the gravity direction and the separated air can be positioned on the upper side of the electrolytic solution. In this case, when the electrolytic solution and air are supplied to the flow path control unit 121 side by the piston, only the electrolytic solution is supplied through the first path st1 or only the air is supplied through the first path st1, There is a problem that the formation efficiency of the organic EL device is lowered. The porous member 123 serves to prevent separation of the air and the electrolyte by using the capillary phenomenon.

Meanwhile, as shown in FIG. 8, the rotation member 124 is provided adjacent to the porous member 123. The rotation unit 124 functions to supply the electrolyte 123 and the porous member 123 in a mixed state temporarily, instead of separating the electrolytic solution and the air, while rotating according to the flow of the electrolytic solution.

As described above, the fine bubble supplying section supplies the electrolytic solution containing the fine bubbles through the plurality of the flow pipe to the bass section by the action of the plurality of pistons. Further, by supplying the electrolytic solution in which the minute bubbles are mixed in succession to the plurality of the flow pipe by the action of the swash plate, the minute bubbles can be supplied so as to have a certain direction according to the arrangement of the check valves. On the other hand, when the piston is retracted, the supply of the minute bubbles is interrupted, so that the supply of the fine bubbles can be discontinuously supplied.

That is, the minute bubble supplying unit according to the present embodiment can supply minute bubbles in a pulsed manner at specific positions, and can supply fine bubbles with a certain directionality through a plurality of arranged check valves. When supplying fine bubbles in a pulsed manner or supplying them with a certain directionality, there is no vibration or very small intensity. On the other hand, by supplying minute bubbles having pulse and directionality, it is possible to capture oxygen generated from the acid screen as needed. Due to such an action, even when there is no apparatus for generating a separate vibration, the quality of the oxide film can be improved as compared with an anodizing apparatus which simply supplies bubbles.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. have.

29: Check valve
100: fine bubble supplying unit
112: swash plate
119: Outlet
120: fine bubble forming nozzle
130: Piston

Claims (10)

A bath portion for accommodating the electrolyte solution and forming a space for anodizing in a state of immersing the material to be anodized in the electrolyte solution;
A support for supporting the jig for fixing the anodizing material so as to be immersed in the electrolyte solution;
A plurality of check valves arranged at regular intervals on a bottom surface of the bass portion and allowing fluid to flow into the bass portion; And
And at least one fine bubble supplying unit for supplying an electrolyte solution containing fine bubbles to the plurality of check valves through flow path pipes,
The fine bubble supplying unit may include:
A housing which forms an outer shape and in which a discharge path is formed radially through the central axis direction at a predetermined angle in a radial direction with respect to a central axis and in which an electrolyte and air flow into the discharge path;
A fine-bubble forming nozzle provided on an outlet side of the flow path;
A plurality of pistons reciprocating in the direction of the central axis of the discharge passage;
A rotating shaft provided in the housing center axis direction and rotated by receiving external power; And
And an inclined plate fixed to the rotating shaft in an inclined state with respect to the central axis and rotating together with the rotating shaft to sequentially reciprocate each of the plurality of pistons . The method according to claim 1,
Wherein the minute bubble supplying unit sequentially supplies the fine bubbles to the check valves and at the same time controls the supply period of the minute bubbles to supply an electrolyte solution containing fine bubbles discontinuously through each check valve. 3. The method of claim 2,
Wherein the fine bubble supplying unit controls the supply order of the electrolyte containing fine bubbles through the uniformly arranged check valves to have a predetermined directionality. delete The method according to claim 1,
The fine-bubble forming nozzle may include:
A nozzle body formed in a hollow shape and inserted into the discharge passage;
A flow control unit fixed to the inside of the nozzle body to control the air and the flow path of the electrolyte to form fine bubbles; And
Wherein the micro-bubble forming nozzle includes a porous member for utilizing a capillary phenomenon on the inflow channel side. 6. The method of claim 5,
Wherein the porous member is further provided with a rotating portion that rotates in accordance with the flow of the electrolytic solution on the inlet flow path side. 6. The method of claim 5,
The flow-
A protrusion is formed to decrease in diameter in a direction opposite to a flow direction of the electrolyte from a point fixed to the nozzle body,
A bubble forming space defined by a space having a predetermined depth in a central axis direction from a point fixed to the nozzle body is formed on the inner side of the protrusion,
Wherein the flow path switching hole is formed so as to be inclined with respect to the central axis of the flow path control portion so as to be opposite to the flow direction of the electrolyte solution and air Anodizing device. 8. The method of claim 7,
Wherein the flow control portion includes a first path formed between the protruding portion and the nozzle body portion, a second path leading to the bubble forming space through the flow path switching hole, and a second path extending from the bubble forming space to the discharge side of the nozzle body portion Thereby forming a third path leading to the anodizing device. 9. The method of claim 8,
Wherein the flow path control portion is formed to gradually increase the diameter of the flow path formed along the third path. 10. The method of claim 9,
Wherein the flow control unit collides the movement of the electrolyte and the air through the second path and the movement of the electrolyte and air through the third path to form fine bubbles.

Images