JPS63179036A - 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 Mn and Fe into Al. CONSTITUTION:Said Al alloy contains Mn and Fe in the range of 0.2-1.6wt.% total value and in the range of <=1.0wt.% each value, and the balance consisting of Al. One or more kinds among 0.05%<=Cr<0.2%, 0.05-0.5% Zr, <0.2% Ti, <=0.1% B, 0.05-7% Cu, 0.05-7% Mg, 0.05-8% Zn, 0.05%<=Ni<0.5% and 0.05%<=Si<0.5% 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, for example, an aluminum fist cylinder as a substrate for a photosensitive drum of an electrostatic copying machine has been manufactured by smoothing the surface of an extrusion vibrator by precision cutting. However, such conventional precision cutting has its limitations due to dimensional accuracy, etc. in meeting the demands for thinner and lighter photosensitive drums, which accompany recent demands for lighter weight and lower prices for copying machines. . Therefore, as a new manufacturing method for aluminum cylinders that can meet the above requirements, a plate-shaped corrugated material made of rolled material is drawn to make a bottomed cylindrical material, and then ironed. There is a manufacturing method generally referred to as the DI method in which a product with a predetermined diameter is produced through ironing, and a manufacturing method known as the El method in which a product is produced 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 been adopted.

Problems to be Solved by the Invention However, in the various methods described above, microcracks or seizures may occur on the cylinder surface during the ironing or drawing process applied to the cylinder material, resulting in the smoothness of the cylinder surface being deteriorated. It turned out that this led to new problems such as the possibility of losses.

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 microcracks and seizures occur during ironing and drawing depending on the composition of the aluminum alloy for cylinders. We came to the knowledge that the situation was different, and based on this knowledge, as a result of further research, we were able to complete this invention.

That is, in this invention, the total value of M n and Fe is 0.
in the range of 2 to 1.6 wt% and each of 1. 0wt
Contains within the range of 96 or less, or further contains C':0゜0
5wt96 or more and less than 0.2wt%, Zr: 0.05
~0.5wt%, Ti: less than 0.2wt%, B: 0, l
wt% or less, Cu: 0.05~t%, Mg: 0
．． 05-7 wt%, Zn:O.

05-8wt9os Ni: 0-05wt% or more and less than 0.5wt9o, Si: 0.05wt% or more and 0.05wt% or more and less than 0.05wt9os.
The gist of the present invention is an aluminum alloy for cylinders containing less than 5 wt% of one or more types, with the remainder consisting of aluminum and unavoidable impurities, and which has excellent surface N+=lubricity.

To explain the significance and reason for the addition of each element in the aluminum alloy, Mn5Fe prevents microcracks and seizures during ladder processing and drawing process, and in turn contributes to improving the surface smoothness of the cylinder material. It is. However, if the total M-1 content is less than 0.2 wt%, seizure is likely to occur; If it is contained in an excessive amount exceeding swt%, microcracks are likely to occur,
There is even a possibility that the pipe will break.

The preferable range of the total content of Mn and Fe is 0.5 to 1.
It is 5wt%. and Mn and Fe are each independent K-containing
m is 1. Must not exceed Owt%. 1. This is because if it exceeds Owt%, microcracks will occur frequently.

In this invention, in addition to the addition of Mn and Fe, Cr: 0.05 wt% or more and 0.05 wt% or more. Less than 2wt%, Z r
: 0. 05~0. 5wt%, Ti: 0°2wt
%, B: 0.1wt% or less, Cu: 0°05-7
wt%, Mg: 0. 05-7wt96, Zn: 0
．． 05-8wt%, Ni: 0.05wt% or more and less than 0°5wt96, Si: 0.05wt% or more and 0.5wt
% of one or more types is allowed. These contribute to the improvement of various mechanical properties by refining alloy grains, preventing casting cracks, improving strength, improving ironing properties, etc. However, if the content of each element is below the lower limit, this effect will be poor; Even if it is contained in an excessive amount exceeding this value, not only will the effect not be particularly increased, but there is also a risk that microcracks will occur during ironing and the like, which will impair the surface smoothness. The preferred content range is Cr: 0.1wt% or more and less than 0.2wt%, Zr: 0. 1~0. 5wt96, Ti:
Less than 0.2wt%, B: 0.1wt% or less, Cu: 0
．． 1-2. Owt%, Mg: Q.

1-2. Out%, Zn: 0.1-3, Out%, Ni
: 0.1 wt% or more and less than 0.5 wt%, Si: 0. 1
wt9o or more 1-, 0, 5 less than wt96.

The bipedal composition aluminum alloy according to the present invention is DI
In the case of the method, an alloy ingot cast by a known casting method is rolled into a plate material and then drawn to produce a cylinder material, and then this material is ironed to produce an aluminum cylinder. be done. Also E
When using the l method or ED method, the ingot is heated to a temperature of 400 to 600
After extruding at a temperature of about 100°F (°C) to make a cylinder material, it is then ironed and drawn to make an aluminum cylinder. In either case, if necessary, the ingot is heated to a temperature of about 350-630'C
A homogenization treatment of fWjU for ~20 hours may be performed.

By the way, according to the inventor's research, the fact that the above alloy has the effect of preventing microcracks and seizure during ironing and drawing is due to the presence of intermetallic compounds in the alloy structure. 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.
5-20. czm, preferably 2.0 to 10 μm, it is possible to obtain an aluminum cylinder with even better surface smoothness, and in addition, when the area ratio is 0,
It was confirmed by the inventors' subsequent experiments (1 study) that when it accounts for 5 to 5%, it is possible to obtain an aluminum cylinder with even better surface smoothness.

Effects of the Invention The aluminum alloy according to the present invention contains a predetermined amount of Mn.
By doweling Fe with iron, it is possible to prevent the occurrence of micro-cracks and seizures on the surface during ironing and drawing, and to achieve a high level of surface smoothness, as is clear from the examples described below. Aluminum with
It is a cylinder. Therefore aluminum
The advantages of the DI method, El method, ED method, etc. as cylinder manufacturing methods can be fully utilized, and thin-walled, lightweight aluminum cylinders with excellent quality can be provided at a low price.

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

Regarding the aluminum alloy with the δ type composition shown in Table 1 below, the alloy was first cast to a diameter of 152.4 seconds by semi-continuous casting method.
A billet is produced, and then this billet is heated to 600℃.
After homogenization for ×15 hours, the extrusion temperature was set to 500.
℃, outer diameter 65 am, wall thickness 3. It was extruded into a 5rn11 tube material to obtain a material for an aluminum cylinder.

Then, for each material obtained by two feet, the wall thickness is 1.
Ironing was carried out to 4+a (L grinding rate 60%), and the occurrence of microcracks and seizure on the surface of the obtained aluminum cylinder was investigated. The results are shown in Table 1. For both microcracks and seizures, ◎... Not observed at all, ○... Slightly observed but not a problem in practical use, ×... Found in large quantities over a wide area and poses a practical problem. It was evaluated as .

Margin below E] As is clear from the above results, the alloy compositions within the range of the present invention (Samples Nos. 1 to 10) are those in which the occurrence of microcracks and seizure on the surface is suppressed. I understand that there is something.

Incidentally, although specific disclosure has been omitted, Zr and B as well as Mn5Fe are included within the scope of the present invention.

Similar results were obtained when Mg, Zn, and Ni were added alone or in combination with each element at a content within the range of the present invention. 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) Mn and Fe in total value 0.2 to 1.6w
An aluminum alloy for cylinders having excellent surface smoothness, characterized in that each contains 1.0 wt % or less, and the remainder consists of aluminum and unavoidable impurities. (2) Mn and Fe in total value 0.2 to 1.6w
t% and each contains 1.0wt% or less, and further Cr: 0.05wt% or more and 0.2wt%
Zr: 0.05-0.5wt%, Ti: 0.2w
Less than t%, B: 0.1wt% or less, Cu: 0.05-7
wt%, Mg: 0.05 to 7 wt%, Zn: 0.05 to
8wt%, Ni: 0.05wt% or more and less than 0.5wt%, Si: 0.05wt% or more and less than 0.5wt%, and the remainder consists of aluminum and inevitable impurities. Aluminum alloy for cylinders with excellent surface smoothness.