JP2009074144A - Apparatus for anodizing aluminum pipe and anodizing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for anodizing an aluminum pipe, which can form an anodic oxide coating on the surface of the aluminum pipe, can manufacture an aluminum pipe that does not have a burr-like salient defect consequently and can perform an anodizing treatment with high treatment efficiency and at a low cost. <P>SOLUTION: The anodizing apparatus comprises a porous soft body 2 having a pores-communicating structure and a support 3 for supporting the aluminum pipe P. At least one part of the circumferential surface of the aluminum pipe P supported by the support 3 is arranged so as to come in contact with or come close to the porous soft body 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an anodizing apparatus and an anodizing method for producing an aluminum tube having excellent surface quality, which is used as a base for an OPC photosensitive drum of an electrophotographic apparatus such as a copying machine, a printer, and a facsimile machine.

  In this specification, the term “aluminum” is used to include aluminum and its alloys.

  An aluminum tube used as a substrate for a photosensitive drum of an electrophotographic apparatus such as a copying machine, a printer, or a facsimile machine needs to have a uniform OPC (organic photoconductor) coating on its surface. It is required to be in a state.

  Conventionally, mirror finishing was performed by cutting an aluminum tube, but there was a problem that adjustment and management of cutting tools were not easy and skill was required for work, so it was not suitable for mass production. .

  In recent years, therefore, non-cutting pipes such as DI pipes made by ironing rolled aluminum sheets, EI pipes made by ironing extruded aluminum pipes, and ED pipes made by drawing aluminum extruded pipes are often used as substrates for photosensitive drums. It is getting to be. Above all, ED pipes, unlike other non-cutting pipes, are suitable for mass production because they can produce 10 or more pipes in one process, and are attracting attention as being capable of dealing with mass consumption accompanying market expansion. .

  In general, an ED pipe is obtained by extruding an aluminum billet to obtain an aluminum extruded element pipe, then cutting the extruded element pipe into a predetermined length and drawing it to obtain an outer diameter, an inner diameter, and a wall thickness of the pipe wall. An aluminum tube having a predetermined thickness is obtained, then cut, chamfered at the end, and washed in order, and further subjected to inspection of dimensions and appearance.

  The photosensitive drum substrate comprising the ED tube is required to have a high degree of surface smoothness and dimensional accuracy. However, since it is a non-cutting process, it causes streak-like defects caused by an extrusion die line. , And has fine surface defects such as oil pits caused by the pushing of the lubricating oil in the drawing process.

  In particular, scaly surface defects generated when an extruded element tube with minute aluminum pieces adhering to the surface is pulled out and rises up due to the influence of heat during ultrasonic cleaning or OPC coating, resulting in a crust-like convex defect. It was easy to occur. If such a sacrificial convex defect exists on the surface of the photosensitive drum substrate, there is a problem that when the photosensitive drum is configured and uniformly charged, the salient convex defect tends to be a starting point of leakage (leakage). It was.

As a technique for preventing the occurrence of such a rust-like convex defect, there is a relationship between the centerline average roughness Ra (Y) in the circumferential direction of the bearing portion of the extrusion die and the centerline average roughness Ra (X) in the extrusion direction. , Ra (Y) <Ra (X) is used to produce an extruded aluminum tube by performing extrusion using an extrusion die, so that the surface of the extruded raw tube that is causing the crust-like convex defect A method for suppressing the adhesion (generation) of minute aluminum pieces is known (see Patent Document 1). Although this method can suppress the occurrence of the crust-like convex defect on the surface of the ED tube, the crust-like convex defect may occur in rare cases, and the occurrence of the crust-like convex defect can be reliably prevented. It wasn't.
JP-A-8-267122

  The present inventor believes that even if a scaly surface defect that may be generated by drawing an extruded element tube with a minute aluminum piece attached to the surface is generated, The idea was to form an anodized film on the surface of the aluminum tube so that it would not rise due to the influence of heat during sonic cleaning or OPC coating. That is, the surface of the aluminum drawn tube (ED tube) is hardened (hardened) by forming an anodic oxide film so that the scale-like surface defects do not stand up, thereby reliably preventing the occurrence of the sacrificial convex defects. Inspired.

  By the way, in order to form such an anodized film, an anodizing process must be performed. However, it is strongly demanded that the anodizing process be performed as inexpensively as possible.

  Anodizing treatment of an aluminum material is generally performed by immersing the aluminum material and a counter electrode plate in an electrolytic solution in an electrolytic cell, and energizing the aluminum material as an anode and the counter electrode plate as a cathode. It takes a lot of labor and time to attach to the mounting jig, and these are factors that increase the cost required for the anodizing treatment. Therefore, it has been difficult to apply the conventional anodizing method using the electrolytic cell to the production of the aluminum tube for the photosensitive drum base as it is.

  In addition, since the photosensitive drum substrate comprising the ED tube is continuously produced in large quantities, the anodizing apparatus must be compact so that it can be easily incorporated into the flow of the production line. However, it must be capable of processing at a high speed to correspond to the flow of the production line, but the conventional anodizing apparatus using an electrolytic cell cannot meet such a demand.

  The present invention has been made in view of such a technical background. An anodized film can be formed on the surface of the tube, and an aluminum tube free from a sacrificial convex defect can be manufactured. An object of the present invention is to provide an anodizing apparatus and anodizing method for an aluminum tube, which can be performed at low cost and with high processing efficiency.

  In order to achieve the above object, the present invention provides the following means.

[1] a porous soft body impregnated with an electrolytic solution;
A support for supporting the aluminum tube;
With
At least a part of the outer peripheral surface of the aluminum tube supported by the support is disposed so as to be in contact with or close to the porous soft body,
An anodizing apparatus for an aluminum tube, wherein the aluminum tube is energized through an electrolytic solution that flows out of the porous soft body and contacts the outer peripheral surface of the aluminum tube.

  [2] The anodizing apparatus for an aluminum tube according to [1], wherein the position of contact with the porous soft body on the outer peripheral surface of the aluminum tube supported by the support body moves with time.

[3] The support is configured to support and fix the aluminum tube so as not to rotate in the circumferential direction.
The porous soft body has an outer shape formed in a substantially cylindrical shape,
The porous soft body maintains a state in which a part of the outer circumferential surface of the porous soft body and a part of the outer circumferential surface of the aluminum tube supported and fixed to the support are in contact with each other. However, the circumference of the aluminum tube supported and fixed to the support is moved around, and the position of contact with the porous soft body on the outer peripheral surface of the aluminum tube is changed over time by the rotation. 3. The anodizing apparatus for an aluminum tube according to item 2, wherein the anodizing apparatus is moved in the circumferential direction.

  [4] The porous soft body rotates with the central axis of the soft body as a rotation axis during the orbital movement. By the rotation, the porous soft body is in contact with the aluminum tube on the outer peripheral surface of the porous soft body. 4. The anodizing apparatus for an aluminum tube according to item 3, wherein the contact position moves in the circumferential direction of the soft body over time.

  [5] The porous soft body is fixed so as not to rotate, and the aluminum tube supported by the support is rotated with the central axis of the tube as a rotation axis, and by the rotation, the outer periphery of the aluminum tube is rotated. 3. The anodizing apparatus for an aluminum tube according to item 2 above, wherein the position of the surface in contact with the porous soft body moves in the circumferential direction of the tube over time.

[6] The porous soft body has an outer shape formed in a substantially columnar shape and rotates around the central axis of the soft body as a rotation axis.
The aluminum tube supported by the support is rotated with the central axis of the tube as a rotation axis,
Item 3. The preceding item 2, wherein the position of contact with the porous soft body on the outer peripheral surface of the aluminum tube is moved in the circumferential direction of the tube over time by the rotation of the porous soft body and the aluminum tube. Aluminum tube anodizing equipment.

  [7] The porous soft body is formed in a substantially cylindrical shape, and an aluminum tube supported by the support body is disposed in an inserted state in a hollow internal space of the porous soft body. Aluminum tube anodizing equipment.

  [8] The anodizing apparatus for an aluminum tube as recited in the aforementioned Item 7, wherein at least one of the porous soft body and the aluminum tube rotates with its center axis as a rotation axis.

  [9] The aluminum tube anodizing apparatus according to [3], [4] or [6], further comprising a scraper disposed in contact with a part of the outer circumferential surface of the porous soft body in the circumferential direction. .

[10] The support is to support the aluminum tube in a mode in which the central axis direction is substantially vertical.
10. The anodizing apparatus for an aluminum tube according to any one of items 3 to 9, wherein the porous soft body is arranged so that a central axis direction thereof is substantially vertical.

  [11] The aluminum tube anodizing apparatus according to any one of [1] to [10], wherein an electrolytic solution is continuously supplied to the porous soft body.

  [12] The porous soft body is formed in a substantially cylindrical shape, and in the hollow internal space of the porous soft body, a liquid passing pipe having a plurality of discharge holes provided in a tube wall is disposed in an inserted state, 12. The anodizing apparatus for an aluminum tube according to 11 above, wherein the electrolytic solution is continuously supplied to the liquid passing tube.

  [13] At least the surface of the liquid flow tube is formed of an electrically conductive material, the liquid flow tube constitutes an electrical contact portion on the cathode side, and the support is formed of at least a surface of an electrically conductive material, 13. The anodizing apparatus for an aluminum tube according to item 12, wherein the support constitutes an electrical contact portion on the anode side.

[14] In the liquid flow tube, at least a part of the surface is formed of one or two or more electrically conductive materials selected from the group consisting of Au, Pt, Zr, Ti, Al, and C. The liquid tube constitutes the electrical contact on the cathode side,
The support has at least a part of a surface formed of one or more electrically conductive materials selected from the group consisting of Au, Pt, Zr, Ti, Al and C, and the support is on the anode side. 13. An anodizing apparatus for an aluminum tube as set forth in 12 above, which constitutes the electrical contact portion.

  [15] The anodizing apparatus for an aluminum tube according to any one of items 1 to 14, wherein a foamed resin molded body having an open cell structure is used as the porous soft body.

  [16] A recovery tank is further provided for recovering the electrolytic solution that has flowed out of the surface of the porous soft body and subjected to electrolysis, and the electrolytic solution recovered in the recovery tank is subjected to filtration, temperature adjustment, and concentration adjustment. 16. The anodizing apparatus for an aluminum tube according to any one of items 1 to 15, wherein the electrolytic solution is supplied to the porous soft body after performing at least one of the operations.

  [17] By disposing at least part of the outer peripheral surface of the aluminum tube in the proximity of a porous soft body having a porous communication structure impregnated with the electrolytic solution, the electrolytic solution flowing out from the surface of the soft body An anodizing method for an aluminum tube, wherein an anodized film is formed on the outer peripheral surface of the aluminum tube by contacting at least a part of the outer peripheral surface of the tube and conducting electrolysis by energization in this contact state .

  [18] Conducting electrolysis in a state where a porous soft body having a porous communication structure impregnated with an electrolytic solution is in contact with at least a part of the outer peripheral surface of the aluminum tube, thereby causing the outer peripheral surface of the aluminum tube to A method for anodizing an aluminum tube, comprising forming an anodized film.

  [19] The method for anodizing an aluminum tube according to 18 above, wherein the electrolysis is performed while moving the contact position of the porous soft body on the outer peripheral surface of the aluminum tube over time.

  [20] The aluminum tube according to the above item 18 or 19, wherein a liquid reservoir of an electrolytic solution is formed in the vicinity of a contact position between the outer peripheral surface of the aluminum tube and the porous soft body, and the electrolysis is performed in the liquid reservoir formation state. Anodizing method.

  [21] The electrolyte contains one compound selected from the group consisting of sulfuric acid, phosphoric acid, oxalic acid, potassium hydroxide, sodium hydroxide, phosphoric acid / nitric acid mixture and phosphoric acid / sulfuric acid mixture. 21. The method for anodizing an aluminum tube according to any one of items 17 to 20, wherein an electrolytic solution is used.

  [22] In the above items 17 to 21, a pipe made of one material selected from the group consisting of an Al—Mn alloy, an Al—Mg alloy, an Al—Mg—Si alloy, and pure Al is used as the aluminum pipe. The method for anodizing an aluminum tube according to any one of the above items.

  [23] It is characterized by comprising an aluminum tube obtained by anodizing by the anodizing method according to any one of items 17 to 22 and having substantially no sacrificial convex defect on the outer peripheral surface. Photosensitive drum substrate.

  In the invention of [1], at least a part of the outer peripheral surface of the aluminum tube supported by the support is disposed so as to be in contact with or close to the porous soft body impregnated with the electrolytic solution. The electrolytic solution that has oozed out of the porous soft body contacts at least a part of the outer peripheral surface of the aluminum tube to form a minute electrolytic cell. Can be anodized. Thus, by forming an anodic oxide film on the outer peripheral surface of the aluminum tube by such anodizing treatment, the outer peripheral surface of the aluminum tube is hardened, so that the scaly surface defects cannot be raised (that is, the crust-like convex defects are generated). do not do). That is, even after this anodizing treatment, for example, ultrasonic irradiation for cleaning or heating at the time of OPC coating, etc., it is possible to sufficiently prevent the occurrence of a ridge-like convex defect. Therefore, the aluminum tube manufactured by anodizing by the anodizing apparatus of the present invention has no surface-like convex defects and is excellent in surface quality. Therefore, for example, the aluminum tube is formed using this aluminum tube as a base. Leakage hardly occurs when the photosensitive drum is uniformly charged.

  In addition, the anodizing apparatus of the present invention does not require a large electrolytic cell as in the prior art when performing anodizing treatment, so that there is an advantage that the installation space of the entire apparatus can be remarkably reduced. Moreover, since the frame attaching operation required when using a large electrolytic cell is not required, anodization can be performed with high processing efficiency. As described above, the anodizing apparatus of the present invention can be designed in a compact manner, and anodizing can be performed with high processing efficiency. Therefore, the anodizing apparatus can be easily incorporated into the flow of a continuous production line ( Anodization can be performed in-line).

  In the invention of [2], since the position of contact with the porous soft body on the outer peripheral surface of the aluminum tube supported by the support body is moved with time, the electrolysis impregnated in the porous soft body is performed. The liquid oozes out at and near the contact position to form a liquid pool, and electrolysis is performed in a state where the liquid pool of the electrolytic solution is formed. That is, electrolysis is performed through the liquid pool of the electrolytic solution. Since it is performed, the electrolysis efficiency can be further improved. In addition, since the position of contact with the porous soft body on the outer peripheral surface of the aluminum tube moves with time, it is possible to scrape off easily removed deposits existing on the outer peripheral surface of the aluminum tube. Is cleaned and a more uniform anodic oxide film can be formed on the outer peripheral surface of the aluminum tube.

  In the invention of [3], while maintaining a state in which a part in the circumferential direction of the outer circumferential surface of the porous soft body whose outer shape is substantially cylindrical and a part in the circumferential direction of the outer circumferential surface of the aluminum tube are in contact with each other. Since the porous soft body circulates around the aluminum tube, an anodized film can be sequentially formed in the circumferential direction of the outer peripheral surface of the aluminum tube.

  In the invention of [4], since the contact position of the porous soft body with the aluminum tube moves with time in the circumferential direction, uneven wear of the outer peripheral surface of the porous soft body can be sufficiently prevented.

  In the invention of [5], since the contact position with the porous soft body on the outer peripheral surface of the aluminum tube moves in the circumferential direction with time, an anodized film can be formed sequentially in the circumferential direction of the outer peripheral surface of the aluminum tube. it can. Further, since the aluminum tube is brought into contact with the porous soft body fixed in a non-rotatable state by rotation, there is an advantage that the outer shape of the porous soft body is less restricted. For example, as a cross-sectional shape of the porous soft body, a polygonal shape such as a triangle, a quadrangle, a pentagon, a hexagon, and an octagon can be employed in addition to a circle.

  In the invention of [6], the rotational direction and the rotational speed of both the porous soft body and the aluminum tube are freely selected and the peripheral speed difference between the outer peripheral surfaces of the both is appropriately set. The position and the amount of the liquid can be changed, and the deposition rate of the anodized film can be set freely.

  In the invention of [7], since the aluminum tube is disposed in the hollow internal space of the substantially cylindrical porous soft body, the contact area between the outer peripheral surface of the aluminum tube and the porous soft body and the contact Since the amount of the electrolytic solution in the region is remarkably increased, the deposition rate of the anodized film can be improved, and the processing efficiency of the anodizing treatment can be improved.

  In the invention of [8], since at least one of the porous soft body and the aluminum tube rotates with the central axis as the rotation axis, the rotation speed can be freely selected. The film formation rate of the anodized film can also be set freely.

  In the invention of [9], since the scraper is further provided so as to be in contact with a part of the outer peripheral surface of the porous soft body in the circumferential direction, dust and dirt attached to the outer peripheral surface of the porous soft body are prevented. It is possible to sufficiently prevent the transfer to the outer peripheral surface of the aluminum tube, and to form a higher quality anodic oxide film.

  In the invention of [10], since both the aluminum tube and the porous soft body are arranged so that the central axis direction thereof is substantially vertical, the electrolytic solution (deteriorated solution) after being subjected to electrolysis is sequentially lowered downward. There is an advantage that can be moved.

  In the invention [11], since the electrolytic solution is continuously supplied to the porous soft body, the amount of the electrolytic solution in the micro electrolytic cell can be increased, and the electrolytic efficiency can be further improved.

  In the invention of [12], since the liquid passage pipe having a plurality of discharge holes provided in the pipe wall is disposed in the hollow inner space of the porous soft body formed in a substantially cylindrical shape, The electrolyte solution can be continuously supplied stably over substantially the entire soft body.

  In the invention of [13], since the electrically conductive material on the surface of the liquid flow tube constitutes an electrical contact portion on the cathode side, and the electrically conductive material on the surface of the support constitutes an electrical contact portion on the anode side, It is not necessary to provide a new component (part) for forming the contact portion.

  In the invention of [14], since the electrically conductive material on the surface of the liquid passage tube constitutes the electrical contact portion on the cathode side, and the electrically conductive material on the surface of the support constitutes the electrical contact portion on the anode side, It is not necessary to provide a new component (part) for forming the contact portion. In addition, since one or two or more kinds of electrically conductive materials selected from the group consisting of Au, Pt, Zr, Ti, Al, and C are used as the electrically conductive material, it melts at the electrical contact portion. The function as an electrical contact part can be maintained over a long period of time.

  In the invention [15], since the foamed resin molded body having an open cell structure is used as the porous soft body, the deterioration due to the electrolytic solution is small, and the function as the electrolytic solution holding medium can be maintained for a long time.

  In the invention of [16], in the case where the electrolytic solution after being subjected to electrolysis is resupplied to the porous soft body, contamination of the electrolytic solution is effective when the replenishment is performed by performing a filtration operation. When the temperature is adjusted and re-supplied, fluctuations in the film quality of the anodized film can be suppressed. Can be suppressed.

  In the invention of [17], the electrolytic solution that has flowed out of the surface of the soft body by disposing the porous soft body having a porous communication structure impregnated with the electrolytic solution in the proximity state on at least a part of the outer peripheral surface of the aluminum tube. Since the liquid is brought into contact with at least a part of the outer peripheral surface of the aluminum tube and electrolysis is performed by energizing in this contact state, the aluminum tube can be anodized. Therefore, since the outer peripheral surface is hardened by anodizing the outer peripheral surface of the aluminum tube, the scaly surface defects do not stand up (that is, no sacrificial convex defects occur). That is, even after this anodizing treatment, for example, ultrasonic irradiation for cleaning or heating at the time of OPC coating, etc., it is possible to sufficiently prevent the occurrence of a ridge-like convex defect. Therefore, the aluminum tube obtained by anodizing by the anodizing method of the present invention has no surface-like convex defects and is excellent in surface quality. Therefore, for example, the aluminum tube is formed using this aluminum tube as a base. Leakage hardly occurs when the photosensitive drum is uniformly charged.

  Further, the anodizing method of the present invention does not require a large electrolytic cell as in the prior art when performing the anodizing treatment, so that there is an advantage that the device space can be remarkably reduced. Moreover, since the frame attaching operation required when using a large electrolytic cell is not required, anodization can be performed with high processing efficiency. As described above, the anodizing method of the present invention can be compactly designed and the anodizing process can be performed with high processing efficiency, so that it can be easily incorporated into the flow of a continuous production line. Yes (can be anodized in-line).

  In the invention of [18], the electrolysis is performed by energizing the porous soft body having a porous communication structure impregnated with the electrolytic solution in contact with at least a part of the outer peripheral surface of the aluminum tube. In the vicinity thereof, the electrolytic solution impregnated in the porous soft body oozes out and an electrolytic cell is formed in this small region, so that the aluminum tube can be efficiently anodized using the electrolytic solution in the small region as a medium. it can. Therefore, since the outer peripheral surface is hardened by anodizing the outer peripheral surface of the aluminum tube, the scaly surface defects do not stand up (that is, no sacrificial convex defects occur). That is, even after this anodizing treatment, for example, ultrasonic irradiation for cleaning or heating at the time of OPC coating, etc., it is possible to sufficiently prevent the occurrence of a ridge-like convex defect. Therefore, the aluminum tube obtained by anodizing by the anodizing method of the present invention has no surface-like convex defects and is excellent in surface quality. Therefore, for example, the aluminum tube is formed using this aluminum tube as a base. Leakage hardly occurs when the photosensitive drum is uniformly charged.

  Further, the anodizing method of the present invention does not require a large electrolytic cell as in the prior art when performing the anodizing treatment, so that there is an advantage that the device space can be remarkably reduced. Moreover, since the frame attaching operation required when using a large electrolytic cell is not required, anodization can be performed with high processing efficiency. As described above, the anodizing method of the present invention can be compactly designed and the anodizing process can be performed with high processing efficiency, so that it can be easily incorporated into the flow of a continuous production line. Yes (can be anodized in-line).

  In the invention of [19], the electrolysis is carried out while the contact position of the porous soft body on the outer peripheral surface of the aluminum tube is moved with time, so that it is possible to rub off the easily attached deposits existing on the outer peripheral surface of the aluminum tube. As a result, the outer peripheral surface of the aluminum tube is cleaned, and a more uniform anodic oxide film can be formed on the outer peripheral surface of the aluminum tube.

  In the invention of [20], since the electrolytic solution pool is formed in the vicinity of the contact position and the electrolysis is performed in this state, that is, the electrolysis is performed through the electrolytic solution pool, the electrolytic efficiency is further improved. Can be made.

  In the invention [21], the electrolytic efficiency can be further improved.

  In the invention of [22], as the aluminum pipe, a pipe made of one material selected from the group consisting of an Al—Mn alloy, an Al—Mg alloy, an Al—Mg—Si alloy, and pure Al is used. The film formation speed of the anodized film can be improved and the film quality of the anodized film can be made more uniform.

  Since the photosensitive drum base according to the invention of [23] is substantially free from a rust-like convex defect on the outer peripheral surface, a photosensitive drum having a photosensitive layer (OPC or the like) coated on the outer peripheral surface of the photosensitive drum base is provided. Leakage is less likely to occur when uniformly charged.

  One embodiment of an anodizing apparatus (1) for an aluminum tube according to the present invention is shown in FIG. In FIG. 1, (2) is a porous soft body, (3) is a support, and (6) is a recovery tank. The anodizing apparatus (1) of the present invention is suitably used for anodizing an aluminum tube for a photosensitive drum substrate.

  The support (3) is a support for supporting the photosensitive drum base aluminum tube (P), and is formed in a substantially cylindrical shape in this embodiment. The said support body (3) is being fixed to the stable state in the aspect whose center axis line direction becomes a substantially up-down direction (refer FIG. 1, 2). The aluminum tube (P) is supported and fixed to the support (3) in a stable state so as not to rotate in the circumferential direction of the tube (P) by being fitted on the outside of the support (3). Yes. That is, the support body (3) supports and fixes the aluminum tube (P) in a stable state so that the central axis direction thereof is substantially vertical and the tube (P) does not rotate in the circumferential direction. . Note that the support (3) is configured to support and fix the aluminum tube (P) in a more stable state by bringing the outer peripheral surface of the support (3) into stronger contact with the inner surface of the aluminum tube (P). A structure that is formed in a cylindrical shape and is divided into a plurality of pieces in the circumferential direction, and spring means for urging each divided piece (support) from the inner side toward the outer side in the radial direction. It is also good.

  As the aluminum pipe (aluminum pipe to be anodized) (P) set on the support (3), a drawn pipe (aluminum ED pipe) obtained by performing a drawing process on an aluminum extruded element pipe, etc. Can be mentioned. More specifically, an aluminum ED tube for a photosensitive drum substrate can be exemplified.

  Examples of the porous soft body (2) include a water-retaining porous soft body having a porous communication structure. In the present embodiment, the porous soft body (2) is formed in a substantially cylindrical shape, and the liquid passing pipe (4) is arranged in an inserted state in the hollow internal space (2a) of the porous soft body (2). (Refer to FIGS. 1 to 3) The porous soft body (2) is supported and fixed in a stable state by the liquid passage pipe (4) so as not to rotate in the circumferential direction. Thus, at least a part of the outer circumferential surface of the aluminum pipe (P) supported and fixed to the support (3) is arranged so as to contact the porous soft body (2).

  As shown in FIG. 3, the liquid passage pipe (4) has an introduction port (4b) at one end (upper end in FIG. 3) and is closed at the other end (lower end in FIG. 3). A number of discharge holes (4a) are formed in the. Thus, when the electrolytic solution is continuously supplied into the liquid passage pipe (4) through the introduction port (4b) by driving the pump (11), the electrolytic solution is supplied to the liquid passage pipe (4). After being discharged from the discharge hole (4a) and invading and passing (impregnated) into the porous communication structure inside the porous soft body (2), outward from the outer peripheral surface of the porous soft body (2) Flows out.

  The electrolyte flowing out from the outer peripheral surface of the porous soft body (2) is contacted at the contact position on the outer peripheral surface of the aluminum tube (P) and the vicinity thereof, and a minute electrolytic cell is formed here. Therefore, the aluminum tube (P) can be anodized using the contact electrolyte as a medium.

  At least a part of the surface of the liquid flow pipe (4) is formed of an electrically conductive material, and the liquid flow pipe (4) constitutes an electric contact portion on the cathode side, while the support (3) At least a part of the surface is formed of an electrically conductive material, and the support (3) constitutes an electrical contact portion on the anode side (see FIG. 1). Electrolysis is performed by energizing between the electric contact portions of these two electrodes, and an anodized film is formed on the outer peripheral surface of the aluminum tube (P) supported by the support (3).

  In a position below the porous soft body (2) and the support (3), a saddle structure for receiving an electrolytic solution that flows out from the porous soft body (2) and falls down after being subjected to electrolysis A liquid receiver (7) is arranged. In addition, a recovery tank (6) is disposed below the liquid receiver (7), and the electrolytic solution received by the liquid receiver (7) is fed into the recovery tank (6). (See FIG. 1).

  In FIG. 1, (8) is a recovered electrolyte treatment means. The recovered electrolyte treatment means (8) is a device that performs filtration, temperature adjustment, and concentration adjustment on the electrolyte recovered in the recovery tank (6). That is, the electrolytic solution recovered in the recovery tank (6) is sent to the recovered electrolytic solution processing means (8), and filtration, temperature adjustment and concentration adjustment are performed in the recovered electrolytic solution processing means (8). After being broken, it is returned to the collection tank (6) (see FIG. 1). The electrolytic solution in the recovery tank (6) is re-supplied to the porous soft body (2) by the pump (11) through the liquid passage pipe (4), but the filtration operation is performed. Therefore, the contamination of the electrolyte can be effectively removed, and the temperature adjustment operation can suppress the fluctuation of the film quality of the anodized film, and the concentration adjustment operation is performed. Therefore, variation in the film formation of the anodized film can be suppressed.

  Thus, since there are a plurality of embodiments of the relative movement mode of the aluminum tube (P) and the porous soft body (2) in the anodizing apparatus (1), they will be sequentially described below with reference to the drawings.

[First Embodiment]
In this 1st Embodiment, as shown in FIG. 4, the said porous soft body (2) is a part of the circumferential direction of the outer peripheral surface of this porous soft body (2), and the said support body (3). Around the periphery of the aluminum pipe (P) supported and fixed to the support (3) while maintaining a state where the outer peripheral surface of the supported and fixed aluminum pipe (P) is in contact with each other. It is supposed to be. The circular movement of the porous soft body (2) is performed by controlling the circulation of the liquid pipe (4) inserted into the soft body (2) and supporting and fixing the porous body (2). Is called.

  Thus, an anodic oxide film can be sequentially formed in the circumferential direction of the outer peripheral surface of the aluminum tube (P) by the circular movement of the porous soft body (2). At this time, the contact position with the porous soft body (2) on the outer peripheral surface of the aluminum pipe (P) moves in the circumferential direction of the pipe (P) with time (that is, by the circular movement of the soft body). Then, the electrolyte impregnated in the porous soft body (2) oozes out at and near the contact position to form a liquid pool (Q) (see FIG. 4), and the liquid pool (Q ) Is formed, that is, electrolysis is performed through the liquid reservoir (Q), so that the electrolysis efficiency can be further improved.

  In the first embodiment, in the course of the circular movement of the porous soft body (2), the contact position with the aluminum tube (P) on the outer peripheral surface of the porous soft body (2) is always the same location. (It does not move in the circumferential direction).

[Second Embodiment]
In the second embodiment, the porous soft body (2) includes a part of the outer circumferential surface of the porous soft body (2) and an aluminum tube (supported and fixed to the support (3)). While maintaining a state in which a part of the outer peripheral surface of P) is in contact with each other, it moves around the aluminum pipe (P) supported and fixed to the support (3). This configuration is the same as in the first embodiment. Thus, an anodic oxide film can be sequentially formed in the circumferential direction of the outer peripheral surface of the aluminum tube (P) by the circular movement of the porous soft body (2). At this time, the contact position with the porous soft body (2) on the outer peripheral surface of the aluminum pipe (P) moves in the circumferential direction of the pipe (P) with time (that is, by the circular movement of the soft body). Then, the electrolytic solution impregnated in the porous soft body (2) oozes out at and near the contact position to form a liquid pool (Q) (see FIG. 5), and the liquid pool (Q ) Is formed, that is, electrolysis is performed through the liquid reservoir (Q), so that the electrolysis efficiency can be further improved.

  In addition, in the second embodiment, as shown in FIG. 5, the porous soft body (2) is driven to rotate with the central axis of the soft body (2) as the rotation axis during the circular movement. As a result of such rotation, the contact position of the outer peripheral surface of the porous soft body (2) with the aluminum tube (P) moves in the circumferential direction of the soft body (2) over time. It has been. Thereby, there is an advantage that uneven wear of the outer peripheral surface of the porous soft body (2) (a phenomenon in which only a part of the outer peripheral surface in the circumferential direction is worn) can be sufficiently prevented.

[Third Embodiment]
In the third embodiment, as shown in FIG. 6 (a), the porous soft body (2) is supported and fixed to the liquid flow pipe (4) so as not to rotate, and is supported by the support (3). The fixed aluminum pipe (P) is controlled so as to be driven to rotate with the central axis of the pipe (P) as the rotation axis, and by such rotation, the porous soft material on the outer peripheral surface of the aluminum pipe (P) is controlled. The position of contact with the body (2) moves in the circumferential direction of the pipe (P) over time. As described above, the aluminum tube (P) rotates while being in contact with the porous soft body (2), whereby an anodized film can be sequentially formed in the circumferential direction of the outer peripheral surface of the aluminum tube (P). At this time, the electrolyte impregnated in the porous soft body (2) oozes out at and near the contact position with the aluminum tube (P) to form a liquid pool (Q) (FIG. 6 (a)). Since the electrolysis is performed in a state where the liquid reservoir (Q) is formed, that is, the electrolysis is performed through the liquid reservoir (Q), the electrolytic efficiency is further improved. be able to.

  In addition, since this 3rd Embodiment is the structure which makes the aluminum pipe (P) to rotate contact the porous soft body (2) of the state fixed so that rotation was not possible, of porous soft body (2) Less restrictions on the outer shape. Therefore, for example, as the cross-sectional shape of the porous soft body (2), it is possible to adopt a square shape (2X) as shown in FIG. 6 (b) as well as a circular shape as shown in FIG. 6 (a). Furthermore, it is also possible to adopt polygonal shapes such as a triangle, pentagon, hexagon, and octagon.

[Fourth Embodiment]
In the fourth embodiment, as shown in FIG. 7, the porous soft body (2) is controlled so as to rotate with the central axis of the soft body (2) as a rotation axis, while the support body is The aluminum pipe (P) supported by (3) is controlled to rotate with the central axis of the pipe (P) as the rotation axis. Such a porous soft body (2) and an aluminum pipe ( Since the position of contact with the porous soft body (2) on the outer peripheral surface of the aluminum pipe (P) is moved with time in the circumferential direction of the pipe (P) by the rotation of P), the aluminum pipe An anodized film can be sequentially formed in the circumferential direction of the outer peripheral surface of (P). At this time, the electrolytic solution impregnated in the porous soft body (2) oozes out at and near the contact position with the aluminum tube (P) to form a liquid pool (Q) (see FIG. 7). Since the electrolysis is performed in a state where the liquid pool (Q) of the electrolytic solution is formed, that is, the electrolysis is performed through the liquid pool (Q) of the electrolytic solution, so that the electrolysis efficiency can be further improved. .

  The rotation of the porous soft body (2) is performed by controlling the rotation of the liquid passage pipe (4) inserted and supported by the soft body (2). . The rotation of the aluminum tube (P) is performed by controlling the rotation of a support (3) inserted into the tube (P) and supporting and fixing the tube (P).

  Moreover, in this 4th Embodiment, it arrange | positions in the state which the front-end edge of a substantially plate-shaped scraper (5) contact | abuts to the part of the circumferential direction of the outer peripheral surface of the porous soft body (2) which rotates. (Refer to FIG. 7) Dust and dirt attached to the outer peripheral surface of the porous soft body (2) can be removed at the tip edge of the scraper (5), whereby dust and dirt are removed from the aluminum tube (P). It is possible to sufficiently prevent the transfer to the outer peripheral surface of.

  In the configuration shown in FIG. 7, the rotation direction of the porous soft body (2) and the rotation direction of the aluminum tube (P) are the same rotation direction (both counterclockwise in FIG. 7). However, the rotation direction of the porous soft body (2) and the rotation direction of the aluminum tube (P) are opposite to each other (one is counterclockwise and the other is clockwise). May be.

  In the fourth embodiment, the rotational direction and rotational speed of both the porous soft body (2) and the aluminum tube (P) can be freely selected, and the peripheral speed difference between the outer peripheral surfaces of both (2) (P). For example, the position of the liquid reservoir (Q) and the amount of the liquid can be changed, and the film formation rate of the anodized film can be freely set.

  Next, the modification of the mutual arrangement | positioning form of the aluminum pipe (P) supported by the said support body (3) and a porous soft body (2) is shown to FIG. In the configuration shown in FIGS. 8 and 9, the porous soft body (2Y) is formed in a substantially cylindrical shape, and an aluminum tube supported by the support body (3) in the hollow internal space of the porous soft body (2Y). (P) is arranged in an interpolated state. Moreover, it arrange | positions so that the outer peripheral surface of the said aluminum pipe (P) and the inner peripheral surface of the said porous soft body (2Y) may contact. Moreover, the outer cylinder (21) is arrange | positioned in the aspect which coat | covers the outer peripheral surface of the said porous soft body (2Y). At least the surface of the outer cylinder (21) is formed of an electrically conductive material. The outer cylinder (21) constitutes a cathode-side electrical contact portion, and the support (3) constitutes an anode-side electrical contact portion. An introduction pipe (23) is connected to the lower end position of the outer cylinder (21), and a V-shaped discharge groove (22) is formed at a part of the upper end edge of the outer cylinder (21). After the electrolytic solution is supplied to the porous soft body (2Y) through the introduction pipe (23), enters the porous communication structure inside the porous soft body (2Y), and passes upward. , And flows out from the discharge groove (22) at the upper edge of the outer cylinder (21). Thus, since the inside of the outer cylindrical body (21) is filled with the electrolytic solution, the electrolytic solution is always supplied into the porous soft body (2Y). The electrolytic solution flowing out from the discharge groove (22) is collected in the collection tank (6) through the liquid receiving part (7). Thus, both the porous soft body (2Y) and the aluminum tube (P) are controlled so as to rotate and rotate with the central axis as the rotation axis. In this configuration, the contact area between the outer peripheral surface of the aluminum tube (P) and the porous soft body (2) and the amount of the electrolyte in the contact region are remarkably increased, so that the deposition rate of the anodized film is improved. In addition, the treatment efficiency of the anodizing treatment can be improved.

  In FIG. 9, the rotation direction of the porous soft body (2Y) and the rotation direction of the aluminum tube (P) are configured to be opposite to each other, but the same rotation direction (both counterclockwise). You may be comprised so that it may become a rotation direction or both may be clockwise direction.

  In FIG. 9, both the porous soft body (2Y) and the aluminum tube (P) are driven to rotate. However, the present invention is not particularly limited to such a configuration, and the porous soft body ( 2Y) may be fixed so as not to rotate, and only the aluminum tube (P) may be driven to rotate, or the aluminum tube (P) may be fixed so as not to rotate, and only the porous soft body (2Y) may be rotated. May be configured to be driven to rotate. Alternatively, both the porous soft body (2Y) and the aluminum tube (P) may be fixed so as not to rotate.

  Thus, each of the anodizing apparatuses (1) of the above embodiments can form an anodized film on the outer peripheral surface of the aluminum tube (P), and the aluminum tube (P) can be formed by forming the film. Since the outer peripheral surface is hardened, even if a scale-like surface defect exists on the outer peripheral surface, it is possible to sufficiently prevent the scale-like surface defect from rising and generating a sacrificial convex defect. That is, even if the aluminum tube (P) manufactured by anodizing with this anodizing apparatus (1) is subjected to, for example, ultrasonic irradiation for cleaning or heating during OPC coating, Defects can be sufficiently prevented from occurring. Thus, the aluminum tube (P) obtained by the anodizing treatment by the anodizing device (1) has no surface-like convex defects and is excellent in surface quality. Leakage (leakage) is unlikely to occur when the photosensitive drum constituted with P) as a base is uniformly charged.

  Further, the anodizing apparatus (1) does not require a large electrolytic cell as in the prior art when performing anodizing, and therefore has an advantage that the installation space of the entire apparatus can be remarkably reduced. Moreover, since complicated manual work such as a frame work required when using a large electrolytic cell is not required, anodization can be performed with high processing efficiency. Thus, since the anodizing apparatus (1) of the present invention can be designed compactly and can perform anodizing with high processing efficiency, for example, a continuous aluminum pipe (P) for a photosensitive drum substrate. It can be easily integrated into the flow of the production line, and thus anodization can be performed in-line.

  In the above-described embodiment, the liquid pipe (4) or the outer cylinder (21) is formed by forming at least a part of the surface of the liquid pipe (4) or the outer cylinder (21) from an electrically conductive material. Constitutes an electrical contact part on the cathode side, and the support (3) forms at least a part of the surface of an electrically conductive material so that the support (3) constitutes an electrical contact part on the anode side. However, the electrically conductive material for forming these electrical contacts is not particularly limited, but one or two selected from the group consisting of Au, Pt, Zr, Ti, Al, and C. The above electrically conductive materials are suitable. When the electrical contact portion is configured by using one or more kinds of electrically conductive materials selected from the group consisting of Au, Pt, Zr, Ti, Al, and C, the electrical contact portion does not melt. The function as an electrical contact portion can be maintained over a long period.

  In the present invention, as the porous soft body (2) (2X) (2Y), any water-retaining porous soft body having a porous communication structure can be used. Among these, a foamed resin molded body having an open cell structure is preferable. Although it does not specifically limit as a resin raw material of the foamed resin molding of the said open cell structure, For example, PVA (polyvinyl alcohol), a polyurethane, polyethylene, a polystyrene, sponge etc. are mentioned.

  As the electrolytic solution, an electrolytic solution containing sulfuric acid, phosphoric acid, oxalic acid, potassium hydroxide, sodium hydroxide, phosphoric acid / nitric acid mixture or phosphoric acid / sulfuric acid mixture is preferably used. It is not limited to.

  Further, as the aluminum pipe (P), a pipe made of an Al—Mn alloy, an Al—Mg alloy, an Al—Mg—Si alloy, or pure Al can improve the film formation rate of the anodized film. In addition, it is preferably used in that it can be made more uniform in film quality, but is not particularly limited to these examples.

  Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.

<Example 1>
Mn: 1.12% by mass, Si: 0.11% by mass, Fe: 0.39% by mass, Cu: 0.16% by mass, Zn: 0.01% by mass, Mg: 0.02% by mass A billet consisting of Al and inevitable impurities as the remainder was extruded at an extrusion temperature of 520 ° C. and an extrusion speed of 5 m / min to obtain an aluminum extruded raw tube (outer diameter: 32 mm, tube wall thickness: 1.5 mm).

  The obtained aluminum extruded element tube was cut with a cutting machine to obtain a large number of extruded element tubes having a length of 2.2 m. The surfaces of these many extruded element tubes were observed with a magnifying glass having a magnification of 10 times, and those having fine aluminum pieces (aluminum ridges) adhered to the surface were selected.

  The selected extruded element tube was drawn to obtain an aluminum ED tube (outer diameter 24 mm, tube wall thickness 0.8 mm) having scaly surface defects. In addition, the position where the scaly surface defect exists in the outer peripheral surface of the obtained ED tube was marked so that the change of the surface after this could be tracked.

Next, the aluminum ED pipe (P) was supported and fixed on the support (3) of the anodizing apparatus (1) of FIG. 1 described above (see FIG. 2). In the anodizing apparatus (1), the vent pipe (4) is made of Ti, the support (3) is made of Ti, and the porous soft body (2) is made of foamed polyurethane having an open cell structure. As the electrolytic solution, an electrolytic solution containing 150 g / L of sulfuric acid and 10 g / L of dissolved Al was used. The relative movement mode of the aluminum ED pipe (P) and the porous soft body (2) in the anodizing apparatus (1) is set to be the mode shown in FIG. Thus, the outer peripheral surface of the aluminum ED pipe (P) is energized for 2 minutes at 3 A / dm ² in the presence of the electrolyte pool (Q) using the anodizing apparatus (1). An anodized film was formed on the aluminum tube to produce an aluminum tube for a photosensitive drum substrate.

  The rotational speed of the counterclockwise circular movement of the porous soft body (2) was set to 12 laps / minute (see FIG. 4).

<Example 2>
Except for setting the relative movement mode of the aluminum ED pipe (P) and the porous soft body (2) in the anodizing apparatus (1) to be the mode shown in FIG. An anodized film was formed on the outer peripheral surface of the aluminum ED tube to produce an aluminum tube for a photosensitive drum substrate.

  The rotational speed of the counterclockwise circular movement of the porous soft body (2) was set to 12 laps / minute, and the clockwise rotation (spinning) speed of the porous soft body (2) was set to 20 rpm ( (See FIG. 5).

<Example 3>
Except that the relative movement mode of the aluminum ED tube (P) and the porous soft body (2) in the anodizing apparatus (1) was set to the mode shown in FIG. An anodized film was formed on the outer peripheral surface of the aluminum ED tube to produce an aluminum tube for a photosensitive drum substrate.

  The counterclockwise rotation (spinning) speed of the aluminum ED tube (P) was set to 15 rpm (see FIG. 6).

<Example 4>
Except that the relative movement mode of the aluminum ED tube (P) and the porous soft body (2) in the anodizing apparatus (1) was set to the mode shown in FIG. An anodized film was formed on the outer peripheral surface of the aluminum ED tube to produce an aluminum tube for a photosensitive drum substrate.

  The counterclockwise rotation (spinning) speed of the aluminum ED tube (P) was set to 30 rpm, and the counterclockwise rotation (spinning) speed of the porous soft body (2) was set to 30 rpm (see FIG. 7). ).

<Example 5>
Except that the relative movement mode of the aluminum ED tube (P) and the porous soft body (2) in the anodizing apparatus (1) is designed to be the mode shown in FIGS. Then, an anodized film was formed on the outer peripheral surface of the aluminum ED tube to produce an aluminum tube for a photosensitive drum substrate.

  In addition, the clockwise rotation (spinning) speed of the aluminum ED pipe (P) was set to 20 rpm, and the counterclockwise rotation (spinning) speed of the porous soft body (2) was set to 5 rpm (see FIG. 9). .

<Comparative Example 1>
An aluminum tube (no anodized film) was obtained in the same manner as in Example 1 except that the anodizing treatment was not performed.

<Comparative example 2>
An electrolytic solution containing 150 g / L of sulfuric acid and 10 g / L of dissolved Al was placed in an electrolytic cell, and an aluminum ED tube having a scaly surface defect (outer diameter 24 mm, tube wall thickness 0. 8 mm) was immersed, and an anodic oxide film was formed on the outer peripheral surface of the aluminum ED tube by energizing for 15 minutes at 3 A / dm ² in this immersed state.

  For the aluminum tubes of Examples 1 to 5 and Comparative Example 2 in which the anodized film was formed on the outer peripheral surface as described above, and the aluminum tube of Comparative Example 1 in which no film was formed, the following evaluation methods were used. Based on this, the surface quality was evaluated. The results are shown in Table 1.

<Surface quality evaluation method>
The obtained aluminum tube is immersed in pure water, and in this immersed state, an ultrasonic wave of 35 kHz is irradiated for 3 minutes. Then, the aluminum tube is taken out, and the surface of the aluminum tube is visually observed with a magnifying glass having a magnification of 10 times. Examine the presence or absence of convex defects (those with scaly surface defects).

  As is apparent from Table 1, the aluminum tube obtained through the anodizing treatment by the anodizing treatment apparatus of Examples 1 to 5 of the present invention had no surface-like convex defects on the surface and was excellent in surface quality. Moreover, since the anodizing apparatus of Examples 1-5 can form a film in a short anodizing time, it has high processing efficiency and can be easily incorporated into the flow of a continuous production line. is there.

  On the other hand, in Comparative Example 1 in which the anodizing treatment was not performed, the aluminum tube had a surface-like convex defect and was inferior in surface quality. Further, in Comparative Example 2 in which anodization was performed with an anodizing apparatus equipped with a conventional electrolytic cell, the anodizing time for film formation required a long time. It is difficult to incorporate.

  Since the aluminum tube manufactured by the anodizing apparatus and the anodizing method of the present invention is excellent in surface quality, it can be used as an OPC photosensitive drum substrate of an electrophotographic apparatus such as a copying machine, a printer, and a facsimile machine. Preferably used. That is, the anodizing apparatus and the anodizing method of the present invention are suitably used for the production of an aluminum tube for a photosensitive drum substrate having excellent surface quality.

It is a typical schematic diagram showing one embodiment of an anodizing processing device concerning this invention. It is a perspective view which shows the arrangement | positioning form of the aluminum tube supported by the support body, and a porous soft body. It is a perspective view shown in the state where the porous soft body and the liquid flow pipe were separated. It is a top view (top view) which shows an example of the relative movement aspect of an aluminum tube and a porous soft body. It is a top view which shows the other example of the relative movement aspect of an aluminum tube and a porous soft body. It is a top view which shows the further another example of the relative movement aspect of an aluminum tube and a porous soft body. It is a top view which shows the further another example of the relative movement aspect of an aluminum tube and a porous soft body. It is a perspective view which shows the modification of the arrangement | positioning form of the aluminum tube supported by the support body, and a porous soft body. It is a top view of the modification of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Anodizing apparatus 2 ... Porous soft body 2a ... Hollow interior space 3 ... Support body 4 ... Liquid passage 4a ... Discharge hole 5 ... Scraper 6 ... Recovery tank P ... Aluminum pipe Q ... Liquid reservoir

Claims (23)

A porous soft body impregnated with an electrolytic solution;
A support for supporting the aluminum tube;
With
At least a part of the outer peripheral surface of the aluminum tube supported by the support is disposed so as to be in contact with or close to the porous soft body,
An anodizing apparatus for an aluminum tube, wherein the aluminum tube is energized through an electrolytic solution that flows out of the porous soft body and contacts the outer peripheral surface of the aluminum tube.   2. The anodizing apparatus for an aluminum tube according to claim 1, wherein a position of contact with the porous soft body on an outer peripheral surface of the aluminum tube supported by the support body moves with time. The support is configured to support and fix the aluminum tube so as not to rotate in the circumferential direction.
The porous soft body has an outer shape formed in a substantially cylindrical shape,
The porous soft body maintains a state in which a part of the outer circumferential surface of the porous soft body and a part of the outer circumferential surface of the aluminum tube supported and fixed to the support are in contact with each other. However, the circumference of the aluminum tube supported and fixed to the support is moved around, and the position of contact with the porous soft body on the outer peripheral surface of the aluminum tube is changed over time by the rotation. The anodizing apparatus for an aluminum tube according to claim 2, which moves in the circumferential direction.   The porous soft body rotates with the central axis of the soft body as a rotation axis during the circular movement, and due to the rotation, the contact position with the aluminum tube on the outer peripheral surface of the porous soft body is reduced. 4. The anodizing apparatus for an aluminum tube according to claim 3, wherein the apparatus moves in the circumferential direction of the soft body over time.   The porous soft body is fixed so as not to rotate, and the aluminum tube supported by the support is rotated with the central axis of the tube as a rotation axis, and by the rotation, the aluminum tube on the outer peripheral surface of the aluminum tube is rotated. The anodizing apparatus for an aluminum tube according to claim 2, wherein the position of contact with the porous soft body moves in the circumferential direction of the tube over time. The porous soft body is formed so that its outer shape is formed into a substantially cylindrical shape and rotates with the central axis of the soft body as a rotation axis,
The aluminum tube supported by the support is rotated with the central axis of the tube as a rotation axis,
The contact position with the said porous soft body in the outer peripheral surface of an aluminum pipe is made to move to the circumferential direction of this pipe | tube over time by rotation of the said porous soft body and the said aluminum pipe. Aluminum tube anodizing equipment.   2. The aluminum tube according to claim 1, wherein the porous soft body is formed in a substantially cylindrical shape, and an aluminum tube supported by the support body is disposed in an inserted state in a hollow internal space of the porous soft body. Anodizing equipment.   The anodizing apparatus for an aluminum tube according to claim 7, wherein at least one of the porous soft body and the aluminum tube rotates with its central axis as a rotation axis.   The anodizing apparatus for an aluminum tube according to claim 3, 4 or 6, further comprising a scraper disposed so as to be in contact with a part of the outer circumferential surface of the porous soft body in the circumferential direction.   The support body supports the aluminum tube in such a manner that its central axis direction is substantially vertical, and the porous soft body is disposed so that its central axis direction is substantially vertical. The anodizing apparatus for an aluminum tube according to any one of claims 3 to 9.   The anodizing apparatus for an aluminum tube according to any one of claims 1 to 10, wherein an electrolytic solution is continuously supplied to the porous soft body.   The porous soft body is formed in a substantially cylindrical shape, and a liquid passing pipe provided with a plurality of discharge holes in a tube wall is disposed in an inserted state in a hollow inner space of the porous soft body. The anodizing apparatus for an aluminum tube according to claim 11, wherein the electrolytic solution is continuously supplied to the aluminum tube.   At least the surface of the liquid flow tube is formed of an electrically conductive material, the liquid flow tube constitutes an electrical contact portion on the cathode side, the support is formed of at least a surface of an electrically conductive material, and the support is The anodizing apparatus for an aluminum tube according to claim 12, which constitutes an electrical contact portion on the anode side. At least a part of the surface of the liquid pipe is formed of one or more electrically conductive materials selected from the group consisting of Au, Pt, Zr, Ti, Al, and C. Configure the cathode side electrical contacts,
The support has at least a part of a surface formed of one or more electrically conductive materials selected from the group consisting of Au, Pt, Zr, Ti, Al and C, and the support is on the anode side. The anodizing apparatus for an aluminum tube according to claim 12, which constitutes an electrical contact portion of the aluminum tube.   The anodizing apparatus for an aluminum tube according to any one of claims 1 to 14, wherein a foamed resin molded body having an open cell structure is used as the porous soft body.   A recovery tank for recovering the electrolytic solution after flowing out from the surface of the porous soft body and subjected to electrolysis, and collecting the electrolytic solution recovered in the recovery tank with at least one of filtration, temperature adjustment and concentration adjustment; The anodizing apparatus for an aluminum tube according to any one of claims 1 to 15, wherein the electrolytic solution is supplied to the porous soft body after performing one operation.   By disposing at least part of the outer peripheral surface of the aluminum tube a porous soft body having a porous communication structure impregnated with the electrolytic solution in an adjacent state, the electrolytic solution flowing out from the surface of the soft body is allowed to flow out of the outer periphery of the aluminum tube. An anodizing method for an aluminum tube, wherein an anodized film is formed on the outer peripheral surface of the aluminum tube by contacting at least a part of the surface and conducting electrolysis in this contact state.   An anodized film is formed on the outer peripheral surface of the aluminum tube by conducting electrolysis while energizing the porous soft body having a porous communication structure impregnated with an electrolyte solution on at least a part of the outer peripheral surface of the aluminum tube. A method for anodizing an aluminum tube, characterized in that   The method for anodizing an aluminum tube according to claim 18, wherein the electrolysis is performed while moving a contact position of the porous soft body on an outer peripheral surface of the aluminum tube with time.   The aluminum tube anode according to claim 18 or 19, wherein a liquid pool of an electrolytic solution is formed in the vicinity of a contact position between an outer peripheral surface of the aluminum tube and the porous soft body, and the electrolysis is performed in the liquid pool formed state. Oxidation method.   As the electrolytic solution, an electrolytic solution containing one compound selected from the group consisting of sulfuric acid, phosphoric acid, oxalic acid, potassium hydroxide, sodium hydroxide, a phosphoric acid / nitric acid mixture and a phosphoric acid / sulfuric acid mixture. 21. The method for anodizing an aluminum tube according to any one of claims 17 to 20.   The tube made of one material selected from the group consisting of an Al-Mn alloy, an Al-Mg alloy, an Al-Mg-Si alloy, and pure Al is used as the aluminum tube. 2. The method for anodizing an aluminum tube according to item 1.   23. A photosensitive material comprising an aluminum tube substantially free from a rust-like convex defect on an outer peripheral surface obtained by anodizing by the anodizing method according to any one of claims 17 to 22. Drum base.

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