JPS62152627A - Aluminum cylinder stock having excellent surface smoothness and manufacture thereof - Google Patents

Abstract

PURPOSE:To make it possible to obtain a cylinder stock having an excellent surface smoothness, by subjecting the outer surface of a pipe successively to buff polishing, degreasing, caustic cleaning and water washing which are indispensable pretreatments for a squeezing process such as pipe extrusion or the like. CONSTITUTION:An extruded aluminum pipe is cut into pieces each having a predetermined length, and one end of the each pipe piece is subjected to a curl bending process as necessary. Thereafter, the outer surface of the predetermined length pipe piece 2 is buffed by a soft buff such as cotton buff or the like together with an abrasive such as tripoli or the like. Then, die traces 4 intrinsic to the pipe are completely removed, but instead, a wax component contained in the abrasive adheres to the outer surface of the pipe piece while a machining affected layer 7 is formed on the outer surface. Accordingly, due to degreasing with the use of an interfacial active agent, the residue of the buff is removed from the outer surface of the pipe piece, and is subjected to caustic cleaning after water washing to remove the machining affected layer so that the outer surface is smoothened. Then after water washing, it is subjected successively to neutralization, water-washing and hot water-washing, and finally is naturally dried, or is dried by hot air to complete the pretreatment, thereby it is possible to obtain a cylinder stock 8 excellent in smooth surface.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to aluminum cylinder materials, particularly those having a highly smooth surface, such as those used as photosensitive drum substrates in xerographic electrostatic copying machines using, for example, plain paper. This invention relates to a method for manufacturing a required aluminum cylinder material.

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

Conventional technology Conventionally, in the production of aluminum photosensitive drums for electrostatic copying machines, the surface of an extruded aluminum pipe is generally smoothed by precision cutting, and a photosensitive thin film of amorphous silicon, selenium, etc. is formed on the surface. It was done by

However, in recent years, as copiers have become lighter and cheaper, photosensitive drums have become thinner and lighter, using organic photoreceptors, that is, the so-called OOP C.
(Organic Photo Conductor
) There is a strong demand for it to be a formula.

The aluminum cylinder material for the 020 type photosensitive drum is manufactured using a manufacturing process generally called the El method, in which an aluminum pipe is extruded and then ironed to form a product with a predetermined diameter. The advantages of the method are attracting attention.

When using this manufacturing method, as shown in Figure 1, an extruded aluminum pipe (1) is made by extrusion processing, and this is used as a starting material and cut to a regular length as shown in Figure 2. Both ends of the shaku pipe (2) are curled to form arc-shaped ends (2) as shown in Figure 3.
After forming a), ironing is performed to obtain a cylinder material (3) having a predetermined outer diameter as shown in FIG. 7.

In FIG. 1, (9) indicates the container of the extruder. However, as shown in Fig. 2, the extruded pipe (1) has many longitudinal lines (4) called dice on its surface.
When this material is subjected to ironing as it is, the surface of the cylinder material (3) used as a product also has a 7th
As shown in the figure, it has a fine vertical pattern (5). For this reason, it has been recognized that the desired surface smoothness cannot be obtained for the cylinder material (3), and furthermore, when this material is used as a photosensitive drum material, the problem arises that the clarity of the developed image is impaired. has been done.

The present invention was made with the aim of solving the above-mentioned problems.

Means for Solving the Problems The inventors conducted various experiments and research for the above purpose, and found that by subjecting the extruded aluminum pipe to a predetermined preprocessing process before ironing, the finished state of the pipe could be improved. The present invention was completed based on the discovery that a cylinder material with extremely good surface smoothness could be obtained.

That is, the present invention provides a method for manufacturing aluminum cylinder materials by the EI method, that is, a method for manufacturing aluminum cylinder materials using an extruded pipe as a starting material and ironing it to make a product. The treatment is characterized in that the steps of buffing, degreasing, caustic cleaning, and water washing are sequentially performed on the surface of the extruded pipe.

Therefore, in this invention, an extruded aluminum pipe is cut to a specified length as shown in FIG.
After curling one end as shown in the figure,
First, the surface of the regular length pipe (2) is buffed as shown in FIG. In the figure, (6) indicates a buff, and (10) indicates a presser roll. The buff (6) used here is a soft one such as a cotton buff, and is polished with an abrasive such as Tripoli. As a result of this buffing, the die lines (4) that the standard length pipe (2) originally had are completely eliminated, as shown in Figure 5, but they are replaced by the die lines (4) contained in the abrasive material. The wax component adheres to the surface, and a process-affected layer (a single layer of beil vinyl) is formed on the surface. Therefore, this buffed pipe (7) is then further processed in the next step.

First, degrease and clean to remove buff residue from the surface. Therefore, this degreasing can be carried out by any chemical method including immersion in a cleaning liquid having buff residue removal properties, and for example, a method using surfactant degreasing can be suitably used.

Next, it is desirably washed once with water and then subjected to caustic washing. This step involves adding lHL to about 40 to 70°C.
/ 10 to 300 to 30 to 8i/Q caustic soda aqueous solution
This is done by immersing the pipe (2) for about 2 seconds, thereby removing the damaged layer on the surface of the pipe (2) and smoothing the surface.

Next, after washing this with water, preferably further processing steps of neutralization, washing with water, and washing with hot water are sequentially performed, and finally, air drying or drying with hot air blowing is performed to complete the pretreatment.

After the above-mentioned pretreatment, the pipe (2) is ironed by a conventional method to form an aluminum cylinder material (8) of a predetermined diameter as shown in FIG. 6 as a product.

Effects of the Invention According to the present invention, as is clear from the correspondence with the above-mentioned intended purpose, buffing, degreasing, and caustic cleaning are performed as pre-treatments for the ironing process between the extrusion process and the ironing process of the extruded aluminum pipe. By sequentially carrying out the essential steps of , and washing with water, it is possible to obtain a cylinder material with extremely excellent surface smoothness in the product after ironing. Therefore, it is possible to obtain a lightweight, low-cost, high-quality cylinder material with a clear developed image, which can be suitably used as a substrate for an OPC type photosensitive drum of a copying machine.

Example A An extruded aluminum pipe having a diameter of 63 mm and a wall thickness of 2.5 tnm was made by extrusion using 3003 aluminum alloy, and after cutting the pipe into a predetermined size, one end was curled.

Next, using a cotton buff with a diameter of 400 mm and applying Tripoli as an abrasive, the surface of the cut pipe was buffed at a rotation speed of 200 Orpm and a feed rate of 0°5 TrL/jhy.
It was buffed under the following conditions.

After this buffing, using JCB-12A (trade name, manufactured by Nippon CB Chemical Co., Ltd.) as a cleaning agent,
A surfactant degreasing treatment was performed by immersing the sample in a 3W/V% diluted solution for 5 minutes.

Then, 3% of the 50'j/Q NaOH aqueous solution at 50°C was added.
A caustic cleaning treatment was performed by dipping for 0 seconds.

Then, after immersing it in well water for 30 seconds and washing it, immersing it in a 13 W/V 9fi nitric acid aqueous solution at room temperature for 30 seconds to neutralize it, and then washing it with water (well water/immersion for 30 seconds),
It was washed by immersing it in well water at 0 to 60°C for 30 seconds, and then dried.

Thereafter, the aluminum pipe that had undergone the above pretreatment was ironed to obtain an aluminum cylinder with a diameter of 60 mm and a wall thickness of 0.7 mm.

The surface roughness of the cylinder material according to the above embodiment of the present invention is Rmax approximately 0. It had an extremely excellent smoothness of 1μ.

On the other hand, as a comparative example, the surface roughness of the cylinder material obtained by ironing an extruded pipe as it is is Rmax approximately 2.
μ, and in the case of ironing after buff polishing without ironing pretreatment, it is about 1μ of RIlaX, which does not have the surface smoothness desired as a cylinder material for photosensitive drums. Ta.

[Brief explanation of drawings]

Figure 1 shows the process of extruding aluminum pipes, Figure 2 shows the process of cutting the extruded pipe to a fixed length, Figure 3 shows the process of curling one end, Figure 4 shows the buffing process, and Figure 5 shows the appearance after buffing. Fig. 6 is an explanatory diagram showing the external appearance of the cylinder material of the product, and Fig. 7 shows the external appearance of the cylinder material obtained when extruded pipe is ironed without ironing pretreatment. It is an explanatory diagram. (1)...Aluminum extrusion pipe, (2)...Standard length cut pipe, (3)...Cylinder material, (4)...
Lines, (5)... Vertical line pattern, (6)... Buff, (
7)...Buffed pipe, (8)...Cylinder material. that's all

Claims (1)

[Claims] In a method for manufacturing an aluminum cylinder material in which a product is made by ironing an extruded pipe as a starting material, the surface of the extruded pipe is subjected to buffing and degreasing as a pretreatment for the ironing process. A method for manufacturing an aluminum cylinder material with excellent surface smoothness, characterized in that the steps of , caustic cleaning, and water cleaning are sequentially carried out as essential.