JP2000181109A - Aluminum alloy tube for photoreceptor drum and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a inexpensive aluminum alloy tube for a photoreceptor drum having proper surface roughness with which good image printing can be stably performed. SOLUTION: An aluminum alloy raw tube 2 formed by drawing into a specified form is subjected to surface finishing using a roller varnishing device equipped with a roller 1 having the surface roughness of 1.8 to 3.0 μm Rmax and 1.0 to 2.0 μm Rz, and the obtd. aluminum alloy tube for a photoreceptor drum has the surface roughness of 1.6 to 2.4 μm Rmax and 0.6 to 1.2 μm Rz. The aluminum alloy tube for a photoreceptor drum has proper surface roughness so that good image printing can be stably performed. By subjecting the aluminum alloy tube to surface finishing using the roller varnishing device, the tact time can be shortened and the production cost can be reduced compared to a conventional shaping process using a precision lathe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inexpensive aluminum alloy tube for a photosensitive drum, which has an appropriate surface roughness and can stably provide good image printing, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Aluminum alloy tubes for photosensitive drums used in copiers and the like are formed by extruding an aluminum alloy into a tube having a predetermined shape by hot extrusion and drawing, and cutting the tube with a precision lathe. Finished and manufactured.

[0003]

The reason why the surface is finished by cutting after drawing as described above is that the drawn pipe has a surface roughness Rmax of 6 to 10 .mu.m, and a coarse and fine image cannot be obtained. . However, in cutting with a precision lathe,
There is a problem that the tact time required for handling, centering, and cutting of the raw pipe becomes long, and the processing cost increases. Further, since the time required for the centering becomes longer as the diameter of the aluminum alloy pipe becomes smaller, the problem of the tact time cannot be overlooked for the reduction of the diameter of the aluminum alloy pipe accompanying the reduction in size and weight of the copying machine. In addition, when the photosensitive drum is for a laser beam printer, if the surface of the aluminum alloy tube for the photosensitive drum is too smooth, incident light and reflected light of the photosensitive drum interfere with each other, resulting in a problem of uneven image printing. is there. In view of the above, the present inventors have clarified the appropriate surface roughness of the aluminum alloy tube for the photosensitive drum, and studied a method of inexpensively manufacturing the aluminum alloy tube having the appropriate surface roughness. Was completed. SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive aluminum alloy tube for a photosensitive drum, which can stably obtain good image printing with an appropriate surface roughness and a method of manufacturing the same.

[0004]

According to the first aspect of the present invention,
The surface roughness of the roller is set to Rmax 1.8 to 3.0 μm on the aluminum alloy tube formed into a predetermined shape by drawing.
m, Rz 1.0 to 2.0 μm, and surface finish is performed using a roller burnishing apparatus with a surface roughness of Rmax 1.6 to 2.4 μm, Rz 0.6 to
1.2 μm aluminum alloy tube for photosensitive drum.

According to a second aspect of the present invention, there is provided a roller burnishing apparatus in which a surface roughness of a roller is Rmax 1.8 to 3.0 μm and Rz is 1.0 to 2.0 μm on an aluminum alloy raw tube drawn into a predetermined shape. The surface roughness is Rmax 1.6 to 2.4 .mu.
This is a method for manufacturing an aluminum alloy tube for a photosensitive drum having a m, Rz of 0.6 to 1.2 μm.

According to a third aspect of the present invention, a roller having a surface roughness Rmax of 1.8 to 3.0 μm is formed on an aluminum alloy tube which has been drawn into a predetermined shape and then subjected to centerless polishing.
m, Rz 1.0 to 2.0 μm Roller burnishing machine is used to finish the surface, characterized in that the surface roughness is Rmax 1.6 to 2.4 μm, Rz 0.6 to 1.2 μm
m is a method for manufacturing an aluminum alloy tube for a photosensitive drum. In the invention of claims 1 to 3, the surface roughness is J
It is defined based on ISB0601.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the surface roughness of a drum is set to Rmax 1.6 to 2.4 .mu.m, Rz 0.6 to 1.2 .mu.m.
The reason for defining m is that if the surface roughness is less than Rmax 1.6 μm or less than Rz 0.6 μm, the surface of the photosensitive drum is too smooth, causing unevenness in image printing.
Further, the surface roughness exceeds Rmax 2.4 μm and Rz 1.2 μm
If it exceeds, the surface is too rough to be used as a photosensitive drum.

The roller burnishing apparatus used in the present invention is an apparatus for smoothing the surface of a material to be processed by pressing a roller having an appropriate surface roughness while rotating the surface of the material to be processed. According to the roller burnishing apparatus, the surface of the material to be treated has an Rmax of 1.0 μm or less and an Rz0.
Finished to a roughness of 4 μm. However, in the present invention, in order to prevent interference unevenness, the surface roughness of the roller of the roller burnishing apparatus is made rougher than usual, and the surface roughness of the aluminum alloy tube is finished to an appropriate roughness. ADVANTAGE OF THE INVENTION According to this invention, compared with the cutting method by a precision lathe, tact time is short and manufacturing cost can be reduced.

As shown in FIGS. 1 and 2, the roller burnishing apparatus used in the present invention presses a plurality of rotatable rollers 1 against the surface of a running aluminum alloy tube 2 while rotating the roller 1. This is a device for smoothing the surface of the tube 2. 1 or 2, 3 is a frame for supporting the roller 1, 4 is a head for applying a pressing force to the roller 1, 5 is a flange for fixing the head 4, 6 is a stopper ring for positioning the flange 5, 7 Is the flange 5
An adjust ring 8 for adjusting the distance between the stopper ring 6 and the pulley 8 is a pulley for rotating the roller 1 around the raw tube 2. The flange 5 is fixed to an apparatus body (not shown) by bolting.

In the present invention, the surface roughness of the roller of the roller burnishing apparatus is set to Rmax 1.8 to 3.0 μm.
m, Rz 1.0 to 2.0 μm, the surface roughness is less than Rmax 1.8 μm, if Rz is less than 1.0 μm, the surface roughness of the aluminum alloy tube is less than Rmax 1.6 μm,
This is because Rz is less than 0.6 μm, the surface is too smooth, causing interference unevenness in image printing, and when the surface roughness of the roller exceeds Rmax 3.0 μm, and when Rz exceeds 2.0 μm, the surface roughness of the aluminum alloy tube is reduced. Rmax 2.4 μm
This is because Rz exceeds 1.2 μm and the surface is too rough to be used as a photosensitive drum.

In the present invention, as the aluminum alloy tube, a drawn tube, a drawn tube after hot extrusion and the like are applied. Further, before the roller burnishing, it is preferable that the base tube is subjected to centerless polishing to reduce uneven thickness and to improve surface roughness to some extent.

In the present invention, aluminum or any aluminum alloy is used for the aluminum alloy tube. In particular, JIS in terms of corrosion resistance, workability, conductivity, etc.
1050, JIS1100, JIS3003, JIS6
Aluminum alloys such as 063 are suitable.

[0013]

The present invention will be described below in detail with reference to examples. (Example 1) Continuous water-cooled JIS 200 mm diameter JIS
The 3003 alloy billet was processed into an extruded tube having an outer diameter of 32 mm by a direct extrusion method using a porthole die, and then this was drawn to obtain a drawn tube having an outer diameter of 30 mm.
Next, the surface of the drawn element tube was finished by the roller burnishing apparatus shown in FIG. 1 to produce an aluminum alloy tube for a photosensitive drum. The roller of the roller burnishing device has a surface roughness of Rmax 1.8 to 3.0 μm, R
Those having a z of 1.0 to 2.0 μm were used.

Example 2 The drawn tube obtained in Example 1 was subjected to centerless polishing to reduce uneven thickness and to improve surface roughness to some extent, and then finished by a roller burnishing device. Otherwise, an aluminum alloy tube for a photosensitive drum was manufactured in the same manner as in Example 1.

(Comparative Example 1) The surface roughness of the roller is Rmax
Less than 1.8 μm, Rz less than 1.0 μm, or Rmax
An aluminum alloy tube for a photosensitive drum was manufactured in the same manner as in Example 1 except that a roller burnishing apparatus having a size exceeding 3.0 μm and a size exceeding Rz 2.0 μm was used.

The surface roughness of each of the aluminum alloy tubes manufactured in Example 1 and Comparative Example 1 was measured. Further, the quality of image printing was investigated using the obtained aluminum alloy tube as a photosensitive drum. The same measurement and investigation were performed on a conventional material obtained by cutting an aluminum alloy pipe after extrusion. Table 1 shows the results. Table 1 also shows the tact time and cost required for surface finishing.

[0017]

[Table 1] (Note) Roller surface roughness. Aluminum alloy pipe surface roughness. No. 1 to 4: Example 1, No. 5: Example 2 (with centerless polishing).

As is clear from Table 1, No. 1 of the present invention example
In each of the samples No. 1 to No. 5, the surface roughness of the aluminum alloy tube was a specified value (Rmax 1.6 to 2.4 μm, Rz 0.6 to 1.2 μm).
m), and good image printing was stably obtained. Among them, No. 5 was particularly excellent in image printing quality due to centerless polishing. In contrast, No. 6 of the comparative example was inferior in the quality of image printing because the surface roughness of the roller of the roller burnishing device was too smooth, and No. 7 was too rough in the surface roughness of the roller. . In addition, the conventional aluminum alloy pipe obtained by cutting has a long tact time and is expensive.

[0019]

As described above, the aluminum alloy pipe for a photosensitive drum of the present invention has a proper surface roughness, so that good image printing can be stably obtained. In particular, those subjected to centerless polishing have excellent image printing quality. In addition, since the surface of the aluminum alloy tube is finished using a roller burnishing apparatus, the tact time is shorter and the manufacturing cost is lower than in a cutting method using a conventional precision lathe. Therefore, an industrially remarkable effect is achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a roller burnishing apparatus.

FIG. 2 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller 2 Aluminum alloy pipe 3 Frame 4 Head 5 Flange 6 Stopper ring 7 Adjust ring 8 Pulley

Claims (3)

[Claims] An aluminum alloy blank formed into a predetermined shape by drawing is provided with a roller having a surface roughness of Rmax.
The surface is finished by using a roller burnishing device of 1.8 to 3.0 μm and Rz of 1.0 to 2.0 μm, and the surface roughness is Rmax of 1.6 to 2.4 μm.
m, Rz 0.6 to 1.2 μm aluminum alloy tube for photosensitive drum. 2. A roller having a surface roughness Rmax of 1.8 to 3.0 is applied to an aluminum alloy tube drawn into a predetermined shape.
The surface is finished by using a roller burnishing apparatus having a surface roughness Rmax of 1.6 to 2.4 μm and an Rz of 0.6 to 1.2 μm.
Manufacturing method of aluminum alloy tube for photosensitive drum of μm. 3. An aluminum alloy tube which has been drawn into a predetermined shape and then subjected to centerless polishing, has a roller having a surface roughness Rmax of 1.8 to 3.0 μm and an Rz of 1.0 to 2.2.
The surface is finished by using a 0 μm roller burnishing apparatus, and has a surface roughness of Rmax 1.6 to
A method for producing an aluminum alloy tube for a photosensitive drum having a thickness of 2.4 μm and an Rz of 0.6 to 1.2 μm.