JPH05331583A - Aluminum alloy tube for base material for photosensitive body for copying machine - Google Patents

Abstract

PURPOSE:To produce an Al alloy tube for base material for photosensitive body for copying machine excellent in surface roughness, out-of-roundness, and straightness by preparing a tube of Al alloy having a composition where respective contents of Fe, Ti, Cu, Mn, and Cr are specified and also respective contents of Si, Mg, and Zn among inevitable impurities are specified. CONSTITUTION:An ingot of an alloy having a composition which consists of, by weight, 0.50-1.00% Fe, 0.01-0.10% Ti, further one or >=2 kinds among 0.05-0.20% Cu, 0.01-0.15% Mn, and 0.01-0.15% Cr, and the balance Al with inevitable impurities and where the contents of Si, Mg, and Zn among the inevitable impurities are specified to <=0.15%, <=0.05%, and <=0.10%, respectively, is extruded, without soaking, at <=480 deg.C extrusion temp. by using a porthole die. By this method, the Al alloy tube for base material for photosensitive body for copying machine, reduced in surface roughness and capable of forming a uniform surface layer, can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy tube as a base of a photosensitive drum of a copying machine and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional photoconductor drum of a copying machine uses JIS 1050 alloy (99.50 wt% or more of pure A as a material).
l) JIS 3003 alloy (Al-1.25 wt% Mn alloy), JIS 6063 alloy (Al-0.7 wt% Mg-
0.4 wt% Si alloy) is used, and these alloy tubes are used as a substrate, and after the surface is mirror-finished, an organic semiconductor layer is coated on the surface or a selenium coating is vapor-deposited. ing. Therefore, as the photoreceptor substrate, one having a low surface roughness but a uniform surface and excellent roundness and straightness is required. This aluminum alloy tube for a photoreceptor substrate is manufactured by the following various manufacturing methods. 1) Pulling → Mirror finishing 2) Finishing only by pulling 3) Plate material → Deep drawing → Handle processing 4) Mandrel extrusion → Handle processing 5) Port hole extrusion → Handle processing Among these manufacturing methods, 1) takes time for mirror surface processing It is costly and expensive, 2) has a high surface roughness, and it is unavoidable that scratches remain, and 3) is difficult to obtain dimensional accuracy (roundness),
In 4), the process is long and the cost is high. Method 5) is the most widely used manufacturing method at present because it has a relatively short process and easy dimensional accuracy.

[0003]

However, even in the manufacturing method by the porthole extrusion, when the conventional extrusion is performed using the conventional alloy, there is a problem that the surface becomes uneven due to the local difference in grain size.

[0004]

DISCLOSURE OF THE INVENTION The present invention has developed an aluminum alloy tube for a photoconductor base of a copying machine and a method for producing the same, which results in a uniform surface layer having a low surface roughness as a result of intensive studies in view of the above situation. is there. That is, the invention according to claim 1 is
Fe 0.50 to 1.00 wt%, Ti 0.01 to 0.10.
wt%, further contains Cu 0.05 to 0.20 wt%, Mn
0.01-0.15 wt%, Cr 0.01-0.15 wt%
Of the unavoidable impurities, Si is 0.15 wt% or less, Mg is 0.05 wt% or less, and Zn is 0. An aluminum alloy tube for a photoconductor base of a copying machine, wherein the content of Fe is 0.50 to 1.00 wt% and Ti is 0.01 to 0.
10 wt%, further Cu 0.05-0.20 wt%,
Mn 0.01-0.15 wt%, Cr 0.01-0.15
It contains one or more of wt% and the balance is Al and inevitable impurities, and S in the inevitable impurities is contained.
i is 0.15 wt% or less, Mg is 0.05 wt% or less, Zn
Is a 0.10 wt% or less alloy ingot and is extruded using a porthole die at an extrusion temperature of 480 ° C. or less without soaking. The invention according to claim 3 is such that Fe 0.50 to 1.00 wt% and Ti 0.01 to
0.10wt%, Cu0.05-0.20wt
%, Mn 0.01 to 0.15 wt%, Cr 0.01 to 0.
It contains one or more of 15 wt% and the balance is A
1 and unavoidable impurities, Si in the unavoidable impurities is 0.15 wt% or less, Mg is 0.05 wt% or less,
An aluminum alloy for a photoconductor substrate of a copying machine, characterized in that an alloy ingot having Zn of 0.10 wt% or less is soaked at a temperature of 300 ° C. or less and then extruded using a porthole die at an extrusion temperature of 480 ° C. or less. It is a method of manufacturing a tube.

[0005]

The reason for adding the alloy components and the reason for limiting the amount added will be described. Fe is added to refine the crystal grains, but if less than 0.05 wt%, the effect is small, and
If it exceeds 10 wt%, the corrosion resistance will be deteriorated.
It is set to 0.10 wt%. Ti also has the effect of refining the crystal grains, but if it is less than 0.01 wt% it has little effect, and if it exceeds 0.10 wt% it causes coarse crystallized products and deteriorates the workability, so it is 0.01 to 0.10 wt%. It was done. C
u, Mn, and Cr all have the effect of improving the strength, but below the respective lower limits, the effect is small, and above the respective upper limits, Cu impairs the corrosion resistance, and Mn and Cr form coarse crystallized substances. It is limited as follows. S
The reason why i is limited to 0.15 wt% or less is that if it exceeds 0.15 wt%, the precipitates are large and large. M
The reason why g is limited to 0.05 wt% or less is that if it exceeds 0.05 wt%, intergranular corrosion and stress corrosion are likely to occur.
In addition, Zn was limited to 0.05 wt% or less by 0.05 wt
This is because stress corrosion tends to occur when the content exceeds%.

Regarding the manufacturing method, do you not soak?
Alternatively, the reason why the temperature is set to 300 ° C. or lower is to prevent recrystallization coarsening, and the case where the extrusion temperature is set to 480 ° C. or lower is also to prevent recrystallization coarsening.

[0007]

EXAMPLES The present invention will now be described in more detail with reference to examples. [Example 1] Various aluminum alloys having the compositions shown in Table 1 were melted and cast into a billet having a diameter of 219 mm by water-cooling casting, and the billet was extruded by a direct extrusion method using a porthole die without soaking. Temperature 400 ℃
A pipe having an outer diameter of 85 mm and a wall thickness of 2.0 mm was extruded. After cutting this pipe to a length of 500 mm, by handling it,
The pipe has an outer diameter of 80 mm, a wall thickness of 1.0 mm, and a length of 700 mm. The surface roughness, roundness, and straightness of the aluminum alloy tube for a photoreceptor substrate thus obtained were evaluated.
The surface roughness is measured by using a contact-type or non-contact type surface roughness measuring device, and Rmax of 2.0 μm or less is ⊚, 2.1 to 3.0.
μm was evaluated as ◯, 3.1 to 4.0 μm as Δ, and 4.1 μm or more as x. Rmax is a numerical value according to the measuring method specified in JIS B0601. The roundness is measured by using a contact type or non-contact type roundness measuring device, 20 μm or less is ◎, 21 to 40 μm is ○, 41 to 60 μm is Δ, 61 μ
M or more was evaluated as x. Further, the straightness is measured by using a non-contact type laser dimension measuring machine, the maximum value is 20 μm or less, ◎ is 21 to 30 μm, is ○, 31 to 40 μm is Δ, and is 41 μm.
M or more was evaluated as x. The results are also shown in Table 1.

[0008]

[Table 1]

As is clear from Table 1, the alloy products of the present invention No.
Nos. 1 to 5 are conventional alloy products. Compared with No. 11, the surface roughness, the roundness, and the straightness are all equal or superior. On the other hand, the comparative alloy product No. 6 ~
10 is any one of surface roughness, roundness, and straightness.
One is extremely bad.

[Example 2] No. 1 in Table 1 The aluminum alloy having the composition shown in FIG. 2 is melted and cast into a billet having a diameter of 219 mm by water-cooling casting. From the billet, the soaking method shown in Table 2 and the external diameter of 32 mm by the direct extrusion method using the porthole die at the extrusion temperature, A pipe with a wall thickness of 1.5 mm was extruded. This pipe is cut into a length of 250 mm, and by processing it, the outer diameter is 30 mm, the wall thickness is 0.8 mm, and the length is 320 mm.
And an aluminum alloy tube for a photoconductor substrate. The surface roughness, roundness, and straightness of these alloy tubes were evaluated in the same manner as in Example 1, and the results are also shown in Table 2.

[0011]

[Table 2]

As apparent from Table 2, the product No. Two
Nos. 1 to 25 are excellent in surface roughness, roundness and straightness. On the other hand, the comparative method product No. which is out of the range of the manufacturing method of the present invention. It is understood that Nos. 26 to 30 have bad or extremely bad surface roughness and roundness.

[0013]

As described above, according to the present invention, an aluminum alloy tube for a photoconductor base of a copying machine, which is excellent in surface roughness, roundness and straightness, can be obtained. It has a great effect.

Claims (3)

[Claims] 1. Fe 0.50 to 1.00 wt%, Ti 0.
01 to 0.10 wt% and further contains Cu 0.05 to 0.
20 wt%, Mn 0.01 to 0.15 wt%, Cr 0.01
Of 0.1 to 0.15 wt%, the balance consisting of Al and unavoidable impurities, and Si in the unavoidable impurities is 0.15 wt% or less and Mg is 0.05 wt%.
An aluminum alloy tube for a photoconductor base of a copying machine, characterized in that Zn is 0.10 wt% or less. 2. Fe 0.50 to 1.00 wt%, Ti 0.
01 to 0.10 wt% and further contains Cu 0.05 to 0.
20 wt%, Mn 0.01 to 0.15 wt%, Cr 0.01
Of 0.1 to 0.15 wt%, the balance consisting of Al and unavoidable impurities, and Si in the unavoidable impurities is 0.15 wt% or less and Mg is 0.05 wt%.
Hereinafter, the production of an aluminum alloy tube for a photoconductor substrate of a copying machine, characterized in that an alloy ingot having Zn of 0.10 wt% or less is extruded using a porthole die at an extrusion temperature of 480 ° C. or less without soaking. Method. 3. Fe 0.50 to 1.00 wt%, Ti 0.
01 to 0.10 wt% and further contains Cu 0.05 to 0.
20 wt%, Mn 0.01 to 0.15 wt%, Cr 0.01
Of 0.1 to 0.15 wt%, the balance consisting of Al and unavoidable impurities, and Si in the unavoidable impurities is 0.15 wt% or less and Mg is 0.05 wt%.
Below, 300 alloy ingots with Zn of 0.10 wt% or less
A method for producing an aluminum alloy tube for a photoconductor substrate of a copying machine, comprising soaking at a temperature of ℃ or less and then extruding at a extrusion temperature of 480 ° C or less using a porthole die.