JPS63306484A - Cylinder suitable for photosensitive drum or the like of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To prevent seizure at the time of color working after extrusion in a production stage and to enable formation at a high working rate by dispersing a hard boride uniformly into an aluminum alloy by addition and incorporation of a specified ratio of B thereto. CONSTITUTION:A cylinder is basically formed of the aluminum alloy contg. B in a 0.001-0.5wt.% range and consisting of the balance aluminum and unavoidable impurities. The hard intermetallic compd. (AlB2) with the aluminum is formed in an adequately dispersed state in the cylinder material. The boride exhibits an excellent cleaning effect on the bearing face of a die at the time of extrusion. Adhesion of the aluminum to the bearing face is thereby prevented and a uniform surface characteristic is formed over the entire circumference and length of the extruded pipe; the extrusion speed is eventually increased. The seizure in the ensuing cold working is prevented and the formation at the high working rate is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cylindrical cylinder used as a base for a photosensitive drum, a magnetic roller, an air cylinder, etc. of an electronic copying machine.

Prior art and its problems For example, as a photosensitive drum base for an electronic copying machine, that is, an aluminum alloy extruded vibrator is used as a photosensitive drum base that supports a photoconductive photosensitive layer such as selenium or an organic photosensitive member in a so-called OPC photosensitive drum. Conventionally, cylinders have been used that have a smooth finish through precision cutting, or are manufactured by further ironing or drawing an extruded vibrator.

However, in the manufacturing process of conventional cylinders, especially when cold working such as ironing or drawing is performed after extrusion, seizure may occur on the cylinder surface and the surface smoothness may be impaired. For this reason, there was a drawback that molding could not be performed at a high processing rate during cold working.

The present invention was made to eliminate such drawbacks, and the object of the present invention is to provide a cylinder that has excellent cold workability and can obtain a high degree of surface smoothness and a high processing rate when manufacturing the cylinder. be.

Means for Solving the Problems This invention is based on the knowledge that by forming a cylinder using a B-containing aluminum alloy, seizure during cold working can be effectively prevented in the cylinder manufacturing process, and molding can be performed at a high processing rate. It was achievable.

Therefore, the cylinder according to the present invention basically has B of 0.
The aluminum alloy contains aluminum in an amount of 0.001 to 0.5 wt%, with the remainder being aluminum and inevitable impurities.

Furthermore, the cylinder according to the present invention is also intended to be made of an aluminum alloy to which various elements are added to improve the properties required in relation to the specific object to which the cylinder is applied. As a cylinder, in addition to the above B content of 0°001 to 0.5 wt%, Mn: 0
°05~1.5wt%, Cr: 0.05~1. Ow
t%, Ti: 0.5Vt% or less, Cu: 0.05 to 7w
t96, Mg: 0. 05-7wt%, Zn:0.
05-8wt%, Si: 0.05-12wt%, Fe
: 0. 05-2wt%, Ni: 0. 05～
The present invention also provides a cylinder containing 8.0 wt % of one or more FJi, with the balance being aluminum and inevitable impurities.

As a feature of this invention, the B added to the cylinder is
By containing it in the range of 0.001 to 0.5 wt%, a hard intermetallic compound (AI2B2) with aluminum is formed in the cylinder material in an appropriate dispersed state. The above-mentioned compound, that is, the boride, has an excellent cleaning effect on the bearing surface of the die during extrusion, preventing aluminum from adhering to the bearing surface and creating a uniform surface texture over the entire circumference and length of the extruded tube. , thereby making it possible to increase the extrusion speed, and
It prevents seizure during subsequent cold working and realizes forming at a high processing rate. However, the content of B is 0.001w
If it is less than t%, the above effect will be poor, and on the contrary, if it is less than 0.5wt% -
If the content exceeds the amount, the die wear during extrusion becomes severe due to the increase in borides. The preferred content range of B is o, o
os~0.3wt%.

Additional elements other than B Mns Crs Ti −, Cu −
) MgSZn and S is Fes Ni may be optionally added alone or in combination of two or more to improve properties, depending on the specific application of the cylinder. That is, Mn.

Cr contributes to the refinement of alloy crystal grains, Ti contributes to preventing casting cracks during casting, Cu, Mg, and Zn contribute to improving the strength of the cylinder, and 5lsFe.

Ni contributes to improving the ironing properties during cylinder manufacturing. However, Mn: less than 0.05 wt%, C
r: less than 0.05 wt%, Cu - less than 0.05 wt%, Mg: less than 0.05 wt%, Zn: less than 0.05 wt%, Si: less than 0.05 wt%, Fe: 0.05 wt%
If the content is less than 0.05 wt%, the effect is poor; if the content is more than 1.5 wt%, the effect is poor if the
more than t%, Ti:Q, more than 5wt%, Cu near wt
%, exceeds Mgnia wt%, Zn: exceeds 8 wt%, Si: exceeds 12 wt%, Fe: exceeds 2 wt%,
Even if Ni is contained in an amount exceeding 8 wt%, not only will this effect not be particularly increased, but on the contrary, coarse intermetallic compounds will be formed, which will impede workability and surface smoothness. The preferred content range is Mn: 0.1 to 1.5 wt%, Cr
:0.1~1゜0wt%, Ti:o, swt% or less, C
u: 0.1-2.0 wt%, Mg: 0.1-2. O
wt%, Zn: 0.1-3.0wt%, Si:
0. 1~3゜0wt%, Fe: 0.1~1.5
wt%, Ni: 0°1 to 3.0 wt%.

The cylinder having the above composition according to the present invention is generally manufactured by extruding it into a tube material by a conventional method and then subjecting the extruded tube to cold working such as ironing or drawing.

By the way, the cylinder according to the present invention is not limited in its use to a photosensitive drum base of an electronic copying machine, but is particularly used as a photosensitive drum base, and has a photoconductive photoreceptor such as selenium or an organic photoreceptor on its surface. When coated with this layer to form a photosensitive drum for an electronic copying machine, the drum can have extremely excellent electrical properties. That is, the electrical properties of a photosensitive drum are evaluated in terms of desired characteristics such as surface potential and dark decay, as well as their characteristics over time.The photosensitive drum using the cylinder according to the present invention has excellent desired characteristics. Moreover, there is little change over time, and the desired performance can be maintained well even during continuous copying.

Effects of the Invention As mentioned above, the cylinder according to the present invention uniformly disperses hard boride in the aluminum alloy by adding a specified amount of B, and the action of this boride makes it difficult to extrude in the manufacturing process. It prevents seizure during subsequent cold working, enables molding at high processing rates, and provides excellent cold workability.

Moreover, when the cylinder of the present invention is applied particularly as a photosensitive drum base of an electronic copying machine, it is possible to provide a photosensitive drum that has excellent electrical characteristics and can produce high-quality copies.

EXAMPLE After melting and casting aluminum alloys having various compositions shown in Table 1 into billets, the extrusion temperature was 500°C and the extrusion speed was 0.
It was extruded into a tube material with an outer diameter of 43 m5 and an inner diameter of 37 m under extrusion conditions of 3 m/mln.

Then, as shown in Table 2, some of the extruded tubes were milled to a surface roughness of IS, and other extruded tubes were rubbed without any cutting, with a processing rate of 50%. Various cylinders were obtained by rolling.

Then, the occurrence of seizure on the cylinder surface obtained above was visually observed, and the degree of wear of the extrusion die was examined. The results are shown in Table 2.

Table 2 (Note) ◎...No seizure O...Slight seizure Δ...
Occurrence of seizure ×... Significant occurrence of seizure As is clear from the above results, the cylinder according to the present invention (
It was confirmed that Nos. 1 to 8) had excellent surface smoothness after cold working in the manufacturing process, and could be molded at a high working rate. It is also understood that B content exceeding the range of the present invention causes die wear.

Further, in order to confirm the superiority of the electrical characteristics of the photosensitive drum when the cylinder according to the present invention is used as a photosensitive drum base of an electronic copying machine, the following test was conducted.

First, an aluminum alloy having the same composition as the other alloys except for No. 9 shown in Table 1 was prepared using an ordinary method with an outer diameter of 65 m.
The material was extruded into an extruded raw tube having an inner diameter of 5111 m, and the extruded raw tube was cut into a length of 150 m, followed by ironing to produce a photosensitive drum base.

Next, an alumite layer (thickness: 5 μm) or a polyethylene film layer (thickness: 1 μm) is formed on the insulating layer on the surface of each photosensitive drum substrate obtained above, and then a polyethylene film layer is further formed as a photosensitive layer on top of the insulating layer. Vinyl carbasieve/trinitrofluorein (PVK/TNF) was coated to a thickness of 15 μm by dipping, thereby forming a photosensitive drum.

For each of the obtained photosensitive drums, changes over time in surface potential and dark decay were examined. Here the surface potential is +5.7k
The potential was evaluated by charging with V for 20 seconds, and the dark decay was evaluated by the ratio of the surface potential to the potential after being left in the dark for 20 seconds. These results are shown in Table 3.

[Margin below] Table 3 (Note) ◎... Items with very little change over time 0...
As is clear from the above results, when the cylinder according to the present invention is applied to the photosensitive drum base of an electronic copying machine, It was confirmed that the method can provide a photosensitive drum having extremely excellent electrical properties.

that's all

Claims (2)

[Claims] (1) A cylinder suitable for a photosensitive drum or the like of an electronic copying machine, characterized in that it is formed of an aluminum alloy containing 0.001 to 0.5 wt% of B, with the balance consisting of aluminum and unavoidable impurities. (2) Contains B: 0.001 to 0.5 wt%, further contains Mn: 0.05 to 1.5 wt%, and Cr: 0.05 to 1.
0wt%, Ti: 0.5wt% or less, Cu: 0.05~
7wt%, Mg: 0.05-7wt%, Zn: 0.05
~8 wt%, Si: 0.05~12 wt%, Fe: 0.
05 to 2 wt%, Ni: 0.05 to 8.0 wt%, and the remainder is aluminum and inevitable impurities. Cylinder suitable for drums, etc.