JPS63179039A - Aluminum alloy for cylinder having excellent surface smoothness - Google Patents

Abstract

PURPOSE:To provide an alloy which permits an Al cylinder having high surface smoothness by ironing and drawing working by incorporating specific ratios of Cr, Ti, V and Co into Al. CONSTITUTION:Said Al alloy contains one or more kinds of 0.2-10wt.% the total amount among Cr, Ti, V, Co and the balance consisting or Al. One or more kinds among 0.05-1.5% Mn, 0.05-0.5% Zr, <=0.1% B, 0.05-7% Cu, 0.05-7% Mg, 0.05-8% Zn, 0.05%<=Ni<0.5%, 0.05%<=Si0.5% and 0.05%<=Fe<0.3% can be furthermore incorporated therein at need. Since said Al alloy does not generate microcrack nor seizure at the time of subjecting the same to the ironing and drawing working, the Al cylinder having the high surface smoothness can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to aluminum cylinders that require a high degree of surface smoothness, such as those used as substrates for photosensitive drums, magnetic rollers, etc. of dry electrostatic copying machines. The present invention relates to an aluminum alloy for cylinders, particularly an aluminum alloy suitable for forming cylinder materials by ironing or drawing.

2. Description of the Related Art Conventionally, aluminum cylinders used as substrates for photosensitive drums in electrostatic copying machines, for example, have been manufactured by precision cutting the surface of an extrusion vibrator to make it smooth. However, such conventional precision cutting has its limits due to dimensional accuracy, etc., in order to meet the demands for thinner and lighter photosensitive drums due to the recent demands for lighter weight and lower prices for copying machines. . Therefore, in order to develop a new manufacturing method for aluminum cylinders that could meet the above requirements, we applied drawing to a plate-shaped corrugated material made of rolled material to create a q-bottom cylindrical material, and then ironed it. There is a manufacturing method generally referred to as the DI method in which a product with a predetermined diameter is made by subjecting the material to a product, and a manufacturing method called the El method in which a product is made by ironing a cylindrical cylinder material produced by extrusion. Similarly, a manufacturing method called the ED method, in which a cylinder material produced by extrusion is subjected to drawing processing to produce a product, has come to be adopted.

Problems to be Solved by the Invention However, in the above-mentioned various methods, microcracks or seizures may occur on the cylinder surface during the ironing or drawing process applied to the cylinder material, and as a result, the smoothness of the cylinder surface may deteriorate. It has been found that this may lead to new problems such as the possibility of using iM.

This invention was made to solve this problem, and is an aluminum cylinder that does not cause microcracks or seizures even after ironing or drawing, and has a highly smooth surface. The object of the present invention is to provide an aluminum alloy for use in cylinders.

Means for Solving the Problems In order to achieve the above object, the inventor conducted various experiments and research, and found that the composition of the aluminum alloy for cylinders can prevent microcracks and seizures during ironing and drawing. It was discovered that the situation of occurrence is different, and based on this knowledge, Kakegawa further completed this invention.

That is, this invention provides Cr s T l % V s Co
One or more of the following in a total amount of 0.2 to 10 wj96
Contains white or further Mn: 0.05 to 1.5wt
%, Zr: 0. 05~0. 5wt96,B;
0°lwt% or less, Cu: 0. 05-7wt%,
Mg: 0, 05 ~ 7wt96, Zn 2
0. 0 5 ~ 8wt96, Ni: 0.05wt
% or more 0. Less than 5wt%, Sl: 0.05wt% or more 0. Less than 5wt%, Fe: 0°05wt% or more 0.3
The gist of this invention is an aluminum alloy for cylinders with excellent surface smoothness, characterized in that less than 60 wt% of one or more types is contained, and the remainder is aluminum and unavoidable impurities.

To explain the significance and reasons for adding each element in an aluminum alloy, Cr and Ti% VlCo both prevent microcracks and seizures during ironing and drawing, and also improve the surface smoothness of the cylinder ladle. This contributes to improving sexual performance. In view of this effect, Cr is used in the present invention.

This means that Ti, V, and Co can be evaluated as equivalent to each other. Therefore, one or more of them can be used in any combination, but the total content is 0. If it is less than 2 wt%, seizure will occur and the quality will deteriorate; if it is contained in an excessive amount exceeding 10 wt%, microcracks will occur and increase, and even lead to pipe breakage. The preferred content range is 0. It is 5 to 9 wt%.

In this invention, in addition to the addition of the above elements, Mn
: 0. 05-1. 5wt96, Zr:O.

05~0. 5wt96, B: 0.1wt% or less, Cu
: 0.05-7wt%, Mg: 0. 05~7w
t%, Zn: 0. 05-8wt%, Ni:0
．． 05wt% or more 0. Less than 5wt%, Si: 0.05
The content of one or more of Fe: 0.05 wt% or more and less than 0.3 wt% is allowed. These include finer alloy grains, prevention of casting cracks,
These elements contribute to the improvement of various mechanical properties by improving strength and ironing properties, but if each element is below the lower limit, the effect will be poor, and conversely, if it is contained in excess above the upper limit, the effect will be diminished. Not only does it not have any particular increasing effect, but there is a possibility that coarse intermetallic compounds may be formed. The preferred a range is M
n: 0.1 to 1.5 wt%, Zr: 0.1 to 0,
5 wt9o, B; 0. 1wt% or less, Cu:
0°1~2. 0wt96, Mg: 0. 1-2.
0++rt! %, Zn: 0. 1-3. Ow
t%, Ni: 0.1wt% or more 0. Less than 5wt%, S
i: 0. 1wt96 or more and less than 0゜5wt96,
Fe: 0. 1 wt', 0 or more 0. 3wt9
6 min crystal.

In the case of using the DI method, the aluminum alloy having the above composition according to the present invention is produced by rolling an alloy ingot cast by a known casting method into a plate material and then drawing it into a material for a cylinder. Manufactured into an aluminum cylinder by ironing. Also El
When using the ED method, the ingot is heated to a temperature of 400 to 600℃.
After extruding at a moderate temperature to make a cylinder material, it is then ironed and drawn to make an aluminum cylinder. In either case,
If necessary, heat the ingot at a temperature of 350 to 630℃ for 1 to 2 hours.
Homogenization treatment may be performed for about 0 hours.

By the way, according to the inventor's research, the presence of intermetallic compounds in the alloy structure is responsible for the -H effect of the above alloy on preventing microcracks and seizure during ironing and drawing. It is assumed that In particular, the average particle size of intermetallic compounds crystallized on the surface of the cylinder material subjected to ironing or drawing is 0.
When the area ratio is 5 to 20 μm, preferably 2.0 to 10 μm, an aluminum cylinder with even better surface smoothness can be obtained, and in addition, the area ratio is 0.5 to 10 μm.
When it accounts for 20%, preferably 2.0-7.5%,
Furthermore, it was confirmed through subsequent experiments and research by the inventors that it was possible to obtain an aluminum cylinder with excellent surface 1L slipperiness.

Effect of the invention The aluminum alloy according to the present invention contains Cr.

By using one or more types of T is V s Co in a predetermined range m3q, it is possible to prevent microcracks and sintering on the surface during ironing or drawing, as will be clear from the examples described below. It is made of aluminum cylinder which can prevent the occurrence of IF' and has a high degree of surface smoothness. Therefore, the advantages of the DI method, El method, ED method, etc. as manufacturing methods for aluminum cylinders can be fully utilized, and thin-walled, lightweight aluminum cylinders with excellent quality can be provided at low prices. .

Example .

Next, examples of the present invention will be described in comparison with comparative examples.

Regarding aluminum alloys having various compositions shown in Table 1 below, each alloy was first directly cast by a semi-continuous casting method.
The billet is made into a 4rtsr billet, then subjected to a homogenization treatment at 600°C for 15 hours, and then extruded at an extrusion temperature of 500°C into a tube material with an outer diameter of 65m+ and a wall thickness of 3.5m to produce aluminum cylinder material. And so.

For each material obtained above, the wall thickness was 1.4
After ironing was performed to a depth of mm (L, ironing rate: 60%), the occurrence of microcracks and seizure on the surface of the resulting aluminum cylinder was investigated. The results are also shown in Table 1. In addition, both micro cracks and seizures are: ◎... Not observed at all, ○... Slightly observed or practical! It was evaluated as 2: no problem, and x: recognized in a wide range and in large quantities, causing 1 problem in practical use.

[Left below] As is clear from the above results, the alloy compositions within the range of the present invention (Samples Nos. 1 to 14) are those in which the occurrence of microcracks and seizure on the surface is suppressed. I understand that there is something.

Although specific disclosure has been omitted, Z'', Mg5ZnSNi as well as containing one or more of Cr, Ti, V, and CO within the scope of the present invention.

A within the scope of the present invention including Si alone or in combination with each element
Similar results were obtained when it was added at port a. Further, similar results were obtained when the same material as shown in the example was subjected to drawing processing to form a cylinder.

that's all

Claims (2)

[Claims] (1) For cylinders with excellent surface smoothness, containing one or more of Cr, Ti, V, and Co in a total amount of 0.2 to 10 wt%, with the remainder consisting of aluminum and unavoidable impurities. Aluminum alloy. (2) Contains one or more of Cr, Ti, V, and Co in a total amount of 0.2 to 10 wt%, and further includes Mn: 0.05
~1.5wt%, Zr: 0.05~0.5wt%, B:
0.1 wt% or less, Cu: 0.05 to 7 wt%, Mg:
0.05-7wt%, Zn: 0.05-8wt%, Ni
:0.05wt% or more and less than 0.5wt%, Si:0.0
5wt% or more and less than 0.5wt%, Fe: 0.05wt%
Contains one or more of at least 0.3 wt%,
An aluminum alloy for cylinders with excellent surface smoothness, characterized in that the remainder consists of aluminum and unavoidable impurities.