JPS63179041A - 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 a specific ratio of Si into Al. CONSTITUTION:Said Al alloy contains 0.5-13.0wt.% Si and the balance consisting of Al. One or more kinds among 0.05-1.5% Mn, 0.05-1.0% Cr, 0.05-0.5% Zr, <=0.5% Ti, <=0.1% B, 0.05-7% Cu, 0.05-7% Mg, 0.05-8% Zn, 0.05%<=Ni<0.5% and 0.05-2% Fe are furthermore incorporated therein at need. Since said Al alloy dose 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 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 called the DI method in which a product is made into a product with a predetermined diameter, and an ironing process [
A manufacturing method known as the El method, in which a product is produced by subjecting cylinders to a process of extrusion, and a manufacturing method known as the ED method, in which a cylinder material made by extrusion is subjected to drawing processing to produce a product, etc. It has become to.

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 in order to solve this problem, and is an aluminum cylinder that does not cause microcracks or seizures even when subjected to ironing or drawing, and has a high degree of surface smoothness. The object of the present invention is to provide an aluminum alloy for cylinders that can be used.

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, Kakegawa further completed this invention.

That is, in this invention, S i ;0. 5-13. 0w
t%, or further Mn: 0.05 to 1.5
νj%, Cr: 0.05-1.0wt%, Zr: 0
．． 05~0. 5wt%, Ti: 0.5wt% or less,
B: 0, lwt% or less, Cu: 0.05-7wt%, M
g: 0. 05~7wt%, Zn: 0°05~8
wj96, Ni: 0.05wt% or more 0. Less than 5 wt%, Fe: 0. The gist of this invention is an aluminum alloy for cylinders having excellent surface smoothness, which is characterized by containing one or more of 05 to 2wt96, and the remainder being aluminum and unavoidable impurities.

To explain the significance and reason for adding each element in aluminum alloy, it is said that it prevents microcracks and seizures during St laddering and drawing, and ultimately contributes to improving the surface smoothness of the cylinder material. be. However, if the content is less than 0.5 wt%, seizure is likely to occur, and on the other hand, if the content exceeds 13.0 wt%, microcracks are likely to occur, and even lead to pipe breakage. There is also a risk. The preferred range of Si is 1.0 to 1.
It is 1.3w1%.

In this invention, in addition to the above-mentioned Si addition, Mn
: 0.05~1.5wt%, Cr: 0°05~1.
0wt%, Zr: 0. 05~0. 5wt%
, Ti: 0.5wt% or less, B: 0.1wt% or less, C
u: 0.05-7wt%, Mg: 0.05-7wt
%, Zn: 0. 05-8wt%, Ni: 0°05
wt96 or more and less than 0.5wt%, Fe: 0.05-2w
One or more types of a content in t% is allowed. These contribute to improving mechanical properties by refining alloy grains, preventing casting cracks, improving strength, improving ironing properties, etc. However, if the content of each element is less than the lower limit, this effect will be poor; Even if it is contained in an excessive amount exceeding the upper limit, not only will the effect not be particularly enhanced, but there is also a risk of producing coarse intermetallic compounds.The preferred content range is Mn: 0.
1-1. 5wt%, Cr: 0.1-1゜0wt%,
Zr: 0.1-0.5wt%, Ti: 0°5wt% or less, B: 0.1wt% or less, Cu: 0°1-2, 0
wt96, Mg: 0.1-2.0wt%, Zn:
0.1 to 3.0 wt%, Ni: 0.1 wt% or more 0.
Less than 5 wt%, Fe: 0. 1-1. It is 5wt%.

In addition to the above components, Na: 0.001 to 0°005wt
%, Sr: 0. 003~0. 06wt96,
Sb: 0. 05~0. 2wt% of type 1 or 2
Containing more than one species or p:o, ot~0,
Inclusion of 2wt96 is optionally allowed. Na is eutectic S
i is finer, Sr prevents whiskers, sb improves corrosion resistance,
Each of P contributes to improving the fluidity of the molten metal.

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 it 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 fact that the above alloy has the effect of preventing microcracks and seizure during ironing and drawing is related to the presence of intermetallic compounds in the alloy structure. It is assumed that especially,
The average particle size of intermetallic compounds crystallized on the surface of the cylinder material subjected to ironing and drawing is 0.5.
~20. When the area ratio is preferably 2.0 to 10 μm, an aluminum cylinder with even better surface smoothness can be obtained.
15%, preferably 260-7.5%,
Furthermore, subsequent experiments and research by the inventors have confirmed that it is possible to obtain an aluminum cylinder with excellent surface smoothness.

Effects of the Invention The aluminum alloy according to the present invention contains a predetermined amount of Si.
As is clear from the examples described later, by containing , it is possible to prevent the occurrence of microcracks and seizures on the surface during ironing and drawing, and it has a high level of surface smoothness. It is made of aluminum cylinder. 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. .

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

Regarding aluminum alloys with various compositions shown in Table 1 below, the alloys were first cast to a diameter of 152.4M by a semi-continuous casting method.
This billet is then heated at 600℃
After 15 hours of homogenization, the extrusion temperature was 500°C.
The material was then extruded into a tube material with an outer diameter of 65 mxt and a wall thickness of 3.5 m, and was used as 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#1l (L ironing rate 60%), and the formability of each material was investigated, as well as the occurrence of microcracks and seizure on the surface of the obtained aluminum cylinder. Combine those results into the first
Shown in the table. In addition, both micro cracks and seizure are ◎...
- Not observed at all, ○: Slightly observed but no practical problem, ×: Widely observed and in large quantities, posing a practical problem.

[Left below] As is clear from the above results, when the alloy composition was within the range of the present invention (Samples Nos. 1 to 10), the occurrence of microcracks and seizure on the surface was suppressed. I understand that there is something.

Although specific disclosure has been omitted, in addition to the inclusion of Si within the scope of the present invention, C'', Zr, and B.

Similar results were obtained when MgsZnsNi was added alone or in combination with each element 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) An aluminum alloy for cylinders with excellent surface smoothness, characterized by containing 0.5 to 13.0 wt% of Si, with the remainder consisting of aluminum and unavoidable impurities. (2) Contains Si: 0.5 to 13.0 wt%, further contains Mn: 0.05 to 1.5 wt%, and Cr: 0.05 to 1.
0wt%, Zr: 0.05-0.5wt%, Ti: 0.
5wt% or less, B: 0.1wt% or less, Cu: 0.05
~7wt%, Mg: 0.05~7wt%, Zn: 0.0
5 to 8 wt%, Ni: 0.05 wt% or more 0.5 wt%
1. An aluminum alloy for cylinders having excellent surface smoothness, characterized in that it contains one or more of Fe: 0.05 to 2 wt%, and the remainder consists of aluminum and unavoidable impurities.