Aluminum alloy for photoreceptor drum body and method for manufacturing photoreceptor drum body

Abstract

To provide an aluminum alloy for a photoreceptor drum body which can manufacture a photoreceptor drum body with a high-quality outside surface, while reducing the amount of primary aluminum to use.SOLUTION: An aluminum alloy has a composition including Si: 0.10-0.50 mass%, Fe: 0.10-0.80 mass%, Cu: 0.05-0.20 mass%, Mn: 1.0-1.50 mass%, Mg: 0-0.05 mass%, Cr: 0-0.05 mass%, Zn: 0-0.10 mass%, Ti: 0.001-0.15 mass%, and the balance being Al and inevitable impurities. The aluminum alloy further includes an aluminum alloy scrap material in an amount of at least 10 mass% having a composition including Si: 0.10-0.80 mass%, Fe: 0.10-1.50 mass%, Cu: 0.01-0.30 mass%, Mn: 0.01-1.50 mass%, Mg: 0-0.03 mass%, Cr: 0-0.10 mass%, Zn: 0-0.10 mass%, Ti: 0.001-0.15 mass%, and the balance being Al and inevitable impurities.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an aluminum alloy for a photosensitive drum substrate, an aluminum alloy extruded tube for a photosensitive drum substrate, a photosensitive drum substrate, and a method for manufacturing a photosensitive drum substrate. [Background technology]

[0002] The photosensitive drum substrates used in laser beam printers, copiers, multifunction machines, etc. are cylindrical, and a photosensitive layer such as an organic photoconductor (OPC) layer must be applied thinly and uniformly to the outer circumferential surface of the photosensitive drum substrate, so the outer circumferential surface of the photosensitive drum substrate must have high surface quality (surface precision).

[0003] Conventionally, the surface quality of the outer circumferential surface of an aluminum alloy tube forming a photosensitive drum substrate has been improved by cutting the outer circumferential surface, but in this case, there are problems such as difficulty in controlling the cutting tools and cutting conditions used in the cutting process, increased processing costs, and difficulty in mass production. The tube obtained by cutting the outer circumferential surface in this way is called a cut tube.

[0004] In recent years, therefore, non-cutting pipes that do not require cutting have come into use. As such non-cutting pipes, ironed pipes obtained by ironing an extruded pipe are known, and furthermore, drawn pipes obtained by drawing an extruded pipe are also known (see Patent Document 1).

[0005] In order to achieve high surface quality on the outer circumferential surface of a non-cut pipe (ironed pipe, drawn pipe), it is necessary to manufacture an extruded pipe with high surface quality. Patent Document 2 describes a technique for manufacturing such an extruded pipe.

[0006] In the technology of Patent Document 2, the Si content of the aluminum alloy used as the material for the extruded pipe is restricted to the range of 0.060 to 0.080 mass%, thereby suppressing the formation of intermetallic compounds that deteriorate the surface quality of the outer peripheral surface of the extruded pipe. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2013-14797 A [Patent Document 2] JP 2020-143339 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, since the silicon content of aluminum alloys is less than the silicon impurity content contained in general new aluminum ingots, mass production is difficult. Furthermore, reducing the silicon content would require the use of more new aluminum ingots, which would result in CO emissions from the electricity required to produce new aluminum ingots. 2 This will result in higher emissions, which will in turn increase the environmental burden and make it more difficult to achieve carbon neutrality.

[0009] The present invention has been made in view of the above-mentioned technical background, and an object of the present invention is to provide an aluminum alloy for a photosensitive drum substrate, which can be used to manufacture a photosensitive drum substrate having excellent surface quality on the outer circumferential surface while reducing the amount of virgin aluminum metal used. Another object of the present invention is to provide a photosensitive drum substrate having excellent surface quality on the outer circumferential surface, a manufacturing method thereof, and an aluminum alloy extruded tube from which the photosensitive drum substrate can be manufactured. [Means for solving the problem]

[0010] The present invention provides the following means.

[0011] 1) Si: 0.10~0.50% by mass, Fe:0.10~0.80% by mass, Cu:0.05~0.20% by mass, Mn: 1.0~1.50% by mass, Mg: 0~0.05% by mass, Cr:0~0.05% by mass, Zn: 0~0.10% by mass, Ti: 0.001~0.15% by mass, An aluminum alloy for a photosensitive drum substrate, the balance of which is composed of Al and unavoidable impurities, Si:0.10~0.80% by mass, Fe: 0.10~1.50% by mass, Cu: 0.01~0.30% by mass, Mn: 0.01~1.50% by mass, Mg: 0~0.03% by mass, Cr:0~0.10% by mass, Zn: 0~0.10% by mass, Ti: 0.001~0.15% by mass, An aluminum alloy for a photosensitive drum substrate, comprising 10% by mass or more of aluminum alloy scrap material, the remainder of which is composed of Al and unavoidable impurities, as a material for the aluminum alloy for a photosensitive drum substrate.

[0012] 2) An aluminum alloy extrusion material obtained by extruding the aluminum alloy casting material for photosensitive drum substrates according to the preceding paragraph 1, An aluminum alloy extruded tube for use as a photosensitive drum substrate, the maximum height Rz of the surface roughness on the outer periphery being 10.0 μm or less.

[0013] 3) An aluminum alloy drawn tube obtained by drawing the aluminum alloy extruded tube described in the preceding paragraph 2, The photosensitive drum substrate has a maximum height Rz of surface roughness on the outer circumferential surface of the aluminum alloy drawn tube of 1.0 μm or less.

[0014] 4) The photosensitive drum substrate according to the above paragraph 3, wherein the outer peripheral surface of the aluminum alloy drawn tube has a Vickers hardness HV of 53 or more.

[0015] 5) Si: 0.10~0.50% by mass, Fe:0.10~0.80% by mass, Cu:0.05~0.20% by mass, Mn: 1.0~1.50% by mass, Mg: 0~0.05% by mass, Cr:0~0.05% by mass, Zn: 0~0.10% by mass, Ti: 0.001~0.15% by mass, A method for manufacturing a photosensitive drum substrate made of an aluminum alloy having a composition with the balance being Al and unavoidable impurities, comprising the steps of: a casting step of obtaining a cast material made of the aluminum alloy by casting a casting raw material, The casting raw material is Si:0.10~0.80% by mass, Fe: 0.10~1.50% by mass, Cu: 0.01~0.30% by mass, Mn: 0.01~1.50% by mass, Mg: 0~0.03% by mass, Cr:0~0.10% by mass, Zn: 0~0.10% by mass, Ti: 0.001~0.15% by mass, A method for manufacturing a photosensitive drum substrate, comprising: a material containing 10% by mass or more of aluminum alloy scrap material, the balance of which is aluminum and unavoidable impurities.

[0016] 6) The method for producing a photosensitive drum substrate according to item 5 above, further comprising an extrusion process step of extruding the cast material to obtain an aluminum alloy extruded tube having a maximum height Rz of surface roughness on its outer periphery of 10.0 μm or less.

[0017] 7) The method for producing a photosensitive drum substrate according to item 6, further comprising a drawing process step of drawing the aluminum alloy extruded tube to obtain an aluminum alloy drawn tube having a maximum height Rz of surface roughness on its outer circumferential surface of 1.0 μm or less.

[0018] 8) The method for producing a photosensitive drum substrate according to the above paragraph 7, wherein in the drawing process, an aluminum alloy drawn tube having an outer circumferential surface with a Vickers hardness HV of 53 or more is obtained. Effect of the Invention

[0019] The present invention provides the following advantages.

[0020] In the above paragraph 1, since the aluminum alloy for the photosensitive drum substrate has a predetermined composition, when the aluminum alloy is used as a material for the photosensitive drum substrate, a photosensitive drum substrate having excellent surface quality of the outer circumferential surface can be manufactured. Furthermore, since the aluminum alloy contains 10 mass % or more of aluminum alloy scrap material having the predetermined composition as a material for the aluminum alloy, the amount of new aluminum ingot required for preparing the aluminum alloy can be reduced.

[0021] In the above item 2, since the maximum height Rz of the surface roughness on the outer circumferential surface of the aluminum alloy extruded tube is 10.0 μm or less, by drawing this extruded tube, the surface quality of the outer circumferential surface of the aluminum alloy drawn tube forming the photosensitive drum substrate can be reliably improved. Therefore, a photosensitive drum substrate having excellent surface quality on the outer circumferential surface can be reliably manufactured.

[0022] In the above item 3, since the maximum height Rz of the surface roughness on the outer circumferential surface of the aluminum alloy drawn tube is 1.0 μm or less, the outer circumferential surface of the photosensitive drum substrate made of this drawn tube has excellent surface quality, which allows a predetermined layer such as a photosensitive layer to be smoothly applied to the outer circumferential surface of the photosensitive drum substrate.

[0023] In the above item 4, since the outer circumferential surface of the aluminum alloy drawn tube has a Vickers hardness HV of 53 or more, a photosensitive drum substrate having high cylindricity can be obtained.

[0024] In the above item 5, since the material of the photosensitive drum substrate is an aluminum alloy having a predetermined composition, it is possible to manufacture a photosensitive drum substrate having excellent surface quality on the outer circumferential surface. Furthermore, since the casting raw material contains 10 mass % or more of aluminum alloy scrap material having a predetermined composition, it is possible to reduce the amount of aluminum ingot required for preparing the aluminum alloy.

[0025] In the above paragraph 6, since the maximum height Rz of the surface roughness on the outer circumferential surface of the aluminum alloy extruded tube obtained by extruding the cast material is 10.0 μm or less, the surface quality of the outer circumferential surface of the aluminum alloy drawn tube can be reliably improved by drawing the extruded tube, and therefore a photosensitive drum substrate having excellent outer circumferential surface quality can be reliably manufactured.

[0026] In the preceding paragraph 7, the maximum height Rz of the surface roughness on the outer circumferential surface of the aluminum alloy drawn tube obtained by drawing the aluminum alloy extruded tube is 1.0 μm or less, thereby making it possible to reliably produce a photosensitive drum substrate having excellent surface quality on the outer circumferential surface.

[0027] In the above item 8, since the outer circumferential surface of the aluminum alloy drawn tube has a Vickers hardness HV of 53 or more, a photosensitive drum substrate having high cylindricity can be obtained. [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is a schematic perspective view of a photosensitive drum substrate according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic cross-sectional view of a direct extrusion processing apparatus in the middle of extruding a billet (aluminum alloy cast material). [Diagram 3] FIG. 3 is a schematic cross-sectional view of a drawing apparatus in the middle of drawing an aluminum alloy extruded tube. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] An embodiment of the present invention will be described below with reference to the drawings.

[0030] The aluminum alloy for a photosensitive drum substrate according to one embodiment of the present invention is used as a material for a photosensitive drum substrate.

[0031] 1, the photosensitive drum substrate 30 is a straight circular tube having a predetermined length. A predetermined layer (not shown), such as a photosensitive layer, is thinly and uniformly coated on the outer peripheral surface 31 of the photosensitive drum substrate 30 in a conventional manner to manufacture the photosensitive drum.

[0032] The aluminum alloy of this embodiment used as the material of the photosensitive drum substrate 30 (hereinafter, for convenience, this aluminum alloy is referred to as the "aluminum alloy of the present invention") is Si: 0.10~0.50% by mass, Fe:0.10~0.80% by mass, Cu:0.05~0.20% by mass, Mn: 1.0~1.50% by mass, Mg: 0~0.05% by mass, Cr:0~0.05% by mass, Zn: 0~0.10% by mass, Ti: 0.001~0.15% by mass, The balance is Al and unavoidable impurities.

[0033] That is, the aluminum alloy of the present invention is an Al-Mn based alloy, and contains Si, Fe, Cu, Mn and Ti as essential components, and Mg, Cr and Zn as optional components.

[0034] Since the aluminum alloy of the present invention has the above-mentioned composition, when the aluminum alloy of the present invention is used as a material for a photosensitive drum substrate, a photosensitive drum substrate having excellent surface quality on the outer circumferential surface can be produced.

[0035] Each component of the aluminum alloy of the present invention will be described below.

[0036] (Si:0.10~0.50 mass%) Silicon improves castability and contributes to improving the strength of the cast material by crystallizing as fine crystals. If the Si content is less than 0.10% by mass, the above-mentioned effects cannot be obtained, and if it exceeds 0.50% by mass, silicon crystallizes as coarse crystals, which not only reduces the mechanical properties but also reduces the surface roughness of the outer circumferential surface of the extruded tube. Therefore, the Si content is preferably in the range of 0.10 to 0.50% by mass. More preferably, the Si content is in the range of 0.20 to 0.40% by mass.

[0037] (Fe:0.10~0.80% by mass) When a large amount of Si and Mn is contained, most of Fe crystallizes as a quaternary intermetallic compound, which contributes to increasing the recrystallization temperature and improving the strength. If the Fe content is less than 0.10 mass%, the above-mentioned effects cannot be obtained, and if it exceeds 0.80 mass%, Fe crystallizes as coarse crystals, which not only reduces the mechanical properties but also reduces the surface roughness of the outer circumferential surface of the extruded tube. Therefore, the Fe content is preferably in the range of 0.10 to 0.80 mass%. More preferably, the Fe content is in the range of 0.20 to 0.60 mass%.

[0038] (Cu:0.05~0.20% by mass) Cu contributes to improving strength by its solid solution strengthening effect. If the Cu content is less than 0.05 mass%, the above effect cannot be obtained, and if it exceeds 0.20 mass%, the corrosion resistance decreases. Therefore, the Cu content is preferably in the range of 0.05 to 0.20 mass%. More preferably, the Cu content is in the range of 0.10 to 0.15 mass%.

[0039] (Mn:1.0~1.50% by mass) When the alloy contains a large amount of Si and Fe, most of the Mn crystallizes as a quaternary intermetallic compound, which contributes to increasing the recrystallization temperature and improving the strength. If the Mn content is less than 1.0% by mass, the above-mentioned effects cannot be obtained, and if the Mn content exceeds 1.50% by mass, Mn crystallizes as coarse crystals, which not only reduces the mechanical properties but also reduces the surface roughness of the outer circumferential surface of the extruded tube. Therefore, the Mn content is preferably in the range of 1.0 to 1.50% by mass. More preferably, the Mn content is in the range of 1.15 to 1.35% by mass.

[0040] (Mg:0~0.05% by mass) Mg dissolves in the aluminum matrix during extrusion, improving the deformation resistance of the matrix and reducing extrusion workability. If the Mg content exceeds 0.05% by mass, the extrusion workability is significantly reduced. Therefore, the Mg content is preferably in the range of 0 to 0.05% by mass. More preferably, the Mg content is in the range of 0 to 0.03% by mass.

[0041] (Cr:0~0.05% by mass) Cr forms intermetallic compounds together with Mn and Si, and has the effect of refining crystal grains. If the Cr content exceeds 0.05 mass%, coarse intermetallic compounds are formed, which leads to deterioration of extrusion processability and deterioration of surface roughness. Therefore, the Cr content is preferably in the range of 0 to 0.05 mass%. The Cr content is more preferably in the range of 0 to 0.03 mass%.

[0042] (Zn:0~0.10% by mass) Zn has the effect of slightly improving strength at room temperature. If the Zn content exceeds 0.10 mass%, the corrosion resistance decreases. Therefore, the Zn content is preferably in the range of 0 to 0.10 mass%. More preferably, the Zn content is in the range of 0 to 0.05 mass%.

[0043] (Ti:0.001~0.15% by mass) Ti has the effect of refining crystal grains in the metal structure of the cast material. If the Ti content is less than 0.001% by mass, the above effect cannot be obtained, and if it exceeds 0.15% by mass, coarse intermetallic compounds are formed, which deteriorates extrusion workability and reduces surface roughness. Therefore, the Ti content is preferably in the range of 0.001 to 0.15% by mass. More preferably, the Ti content is in the range of 0.01 to 0.10% by mass.

[0044] The manufacturing method of the photosensitive drum substrate 30 of this embodiment includes a step of casting a casting raw material to obtain a casting material made of the aluminum alloy of the present invention (casting step), a step of extruding the casting material to obtain an aluminum alloy extruded tube having a maximum height Rz of surface roughness on the outer circumferential surface of 10.0 μm or less (extrusion step), and a step of drawing the aluminum alloy extruded tube to obtain an aluminum alloy drawn tube having a maximum height Rz of surface roughness on the outer circumferential surface of 1.0 μm or less (drawing step).

[0045] In the casting process, the casting raw material has the above-mentioned composition of the aluminum alloy of the present invention, and the casting raw material is prepared by adding aluminum alloy scrap material, etc. to the new aluminum ingot. Therefore, the scrap material is used as a part of the casting raw material.

[0046] The above-mentioned scrap material is Si:0.10~0.80% by mass, Fe: 0.10~1.50% by mass, Cu: 0.01~0.30% by mass, Mn: 0.01~1.50% by mass, Mg: 0~0.03% by mass, Cr:0~0.10% by mass, Zn: 0~0.10% by mass, Ti: 0.001~0.15% by mass, The balance is Al and unavoidable impurities.

[0047] The component elements contained in the scrap materials are derived from the fact that the scrap materials mainly used are Al-Mn-based aluminum alloy materials, Al-Fe-based aluminum alloy materials, pure Al-based aluminum alloy materials, etc.

[0048] The content of scrap material in the casting raw material is 10 mass% or more. This makes it possible to reduce the amount of new aluminum ingots required for preparing the aluminum alloy of the present invention, and to reduce the amount of CO2 emissions derived from the electricity required for producing the new aluminum ingots. 2 It can reduce emissions.

[0049] The upper limit of the scrap material content is not limited, but is preferably 50% by mass. By making the scrap material content 50% by mass or less, the aluminum alloy of the present invention can be easily prepared. The more preferable upper limit of the scrap material content is 40% by mass.

[0050] Regarding the Mg content of the scrap material, since Mg is a component element that reduces extrusion processability as described above, the Mg content of the scrap material is set lower than the upper limit (0.05 mass%) of the Mg content of the raw material for casting in order to prevent Mg from being contained in the cast material as much as possible.

[0051] In the casting process, a molten aluminum alloy is obtained by adding scrap material to virgin aluminum metal and heating and melting it, and a molten metal of a casting raw material is prepared by adding component elements to the molten metal as required. The molten metal of the casting raw material is then tapped at a predetermined temperature (e.g., 650°C to 800°C) and cast through a predetermined filtration to obtain a casting material made of the aluminum alloy of the present invention.

[0052] For filtration, gas bubbling filtration (GBF), rigid media filter (RMF), deep bed filter (DBF), ceramic foam filter (CFF), glass socks, etc. are used alone or in combination.

[0053] The casting method for the cast material is not limited, and for example, continuous casting methods (including semi-continuous casting methods) such as float casting and hot top casting can be used.

[0054] In the extrusion process, the cast material obtained in the casting process is homogenized and then subjected to extrusion.

[0055] The homogenization treatment is a treatment in which the cast material is heated to a temperature several tens of degrees Celsius lower than the solidus temperature, with the main purpose of homogenizing the microsegregation that occurs during rapid solidification during casting. The homogenization treatment is also a treatment performed on the cast material for the purpose of precipitating solute elements that have dissolved as a supersaturated solid solution during solidification. In this embodiment, the cast material is homogenized by heating it to a predetermined temperature and slowly cooling it.

[0056] Next, the homogenized cast material is cut or otherwise obtained as a billet for extrusion processing, which is then preheated to a temperature suitable for extrusion processing and extruded by a prescribed extrusion processing method to obtain an aluminum alloy extruded tube having a maximum height Rz of surface roughness on the outer circumferential surface of 10.0 μm or less. It is preferable that this maximum height Rz is as small as possible, and most preferably Rz is 0 μm.

[0057] The extrusion method is not limited, and may be a direct extrusion method, an indirect extrusion method, etc. In order to obtain an aluminum alloy extruded pipe having a higher surface quality, it is particularly preferable to use a direct extrusion method.

[0058] In the direct extrusion method, for example, a preheated billet 1 is loaded into a cylindrical container 11 provided in a direct extrusion apparatus 10 shown in Fig. 2, and the billet 1 is pressed toward an extrusion die 12 by a stem 17, whereby the material of the billet 1 passes through a die hole (forming hole) 15 having a circular cross section provided in the extrusion die 12, thereby obtaining a cylindrical aluminum alloy extruded tube 2. In this embodiment, for example, a combination die (e.g., a porthole die) equipped with a male die 13 and a female die 14 is used as the extrusion die 12.

[0059] In the figure, the billet 1 is hatched with dots to easily distinguish between the billet (cast material) 1 and the components of the direct extrusion apparatus 10. An arrow E indicates the extrusion direction of the billet 1.

[0060] In the drawing process, the aluminum alloy extruded tube 2 is drawn by a predetermined drawing method according to a conventional method. The drawing method is not limited, and examples thereof include blank drawing, mandrel drawing, floating plug drawing, and mandrel drawing.

[0061] As shown in FIG. 3, when an aluminum alloy extruded tube 2 is drawn using, for example, a blank drawing type drawing device 20, first, a tip 2a of the extruded tube 2 is locally pointed to have a small diameter, and then the tip (point) 2a of the extruded tube 2 is passed through a die hole 22 having a circular cross section provided in a drawing die 21 and chucked by a chuck part 23 of a puller. Then, while supplying drawing oil (not shown) to the outer circumferential surface of the extruded tube 2, the extruded tube 2 is pulled from its tip 2a in the drawing direction D, thereby drawing the extruded tube 2 from the die hole 22. This produces a long aluminum alloy drawn tube 3 having a maximum height Rz of surface roughness on the outer circumferential surface of 1.0 μm or less. It is preferable that this maximum height Rz is as small as possible, and most preferably Rz is 0 μm.

[0062] In the figure, the extruded tube 2 (and the drawn tube 3) is hatched with dots to make it easier to distinguish between the extruded tube 2 (and the drawn tube 3) and the components of the drawing apparatus 20.

[0063] After the drawing process, the aluminum alloy drawn tube 3 is cut to the desired length of the photosensitive drum base 30 to obtain the photosensitive drum base 30 made of the drawn tube 3. The photosensitive drum base 30 is then subjected to chamfering of the ends, cleaning, inspection (dimensions, appearance), etc. in sequence.

[0064] Generally, the photosensitive drum substrate 30 is required to have high cylindricity. In order to obtain a photosensitive drum substrate 30 having such high cylindricity, it is preferable that the Vickers hardness HV of the outer peripheral surface of the drawn tube 3 is 53 or more. When the aluminum alloy of the present invention is used as the material for the photosensitive drum substrate 30, a drawn tube 3 having a Vickers hardness HV of 53 or more on the outer peripheral surface can be reliably obtained, and therefore a photosensitive drum substrate 30 having high cylindricity can be reliably manufactured. The upper limit of the Vickers hardness HV is not limited, and is usually 63.

[0065] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. EXAMPLES

[0066] Specific examples and comparative examples of the present invention are shown below, but the present invention is not limited to the following examples.

[0067] [Table 1]

[0068] [Table 2]

[0069] <Examples 1 to 3 and Comparative Examples 1 to 6> A new aluminum ingot and an aluminum alloy scrap material having the composition shown in Table 1 were prepared. Then, the scrap material was added to the new ingot in a predetermined ratio, and heated and melted to prepare a molten aluminum alloy as a casting raw material. The content of the new ingot and the content of the scrap material in the molten metal are as shown in the "Content of new ingot" and "Content of scrap material" columns in Table 1. Next, the molten metal was cast by gas pressurized hot top casting to obtain an aluminum alloy cast material having the composition shown in Table 2.

[0070] Next, the cast material was homogenized by heating to 620° C. and cooling. Thereafter, the cast material was cut to obtain a billet as a material for extrusion processing made of the cast material.

[0071] The billet was then preheated to 480° C. and then directly loaded into a container of an extrusion processing device and extruded to obtain a cylindrical aluminum alloy extruded tube having a wall thickness of 1.5 mm and an outer diameter of 25 mm.

[0072] The extruded tube was then drawn by a drawing device to obtain a cylindrical aluminum alloy drawn tube for a photosensitive drum substrate having a wall thickness of 0.7 mm and an outer diameter of 20 mm.

[0073] (Vickers hardness HV) The Vickers hardness HV of the outer surface of the drawn pipe was measured in accordance with JIS (Japanese Industrial Standards) Z2244:2020. The measurement conditions were a test force of 49.03 N and a test force holding time of 10 seconds, and the test direction was the circumferential direction of the outer surface of the drawn pipe, and the Vickers hardness HV was evaluated. The meanings of each symbol in the "Vickers hardness" evaluation column in Table 2 are as follows.

[0074] ○: Vickers hardness HV 53 or more ×: Vickers hardness HV less than 53.

[0075] (Maximum height Rz) The maximum height Rz of the surface roughness on the outer circumferential surface of the extruded pipe and the outer circumferential surface of the drawn pipe was measured in accordance with JIS B0601: 2013, and the surface properties were evaluated. The meanings of each symbol in the evaluation column for "maximum height Rz" in Table 2 are as follows:

[0076] · Extruded tube ○: Maximum height Rz is 10.0 μm or less ×: Maximum height Rz exceeds 10.0 μm.

[0077] Drawn pipe ○: Maximum height Rz is 1.0 μm or less ×: Maximum height Rz exceeds 1.0 μm.

[0078] (comprehensive evaluation) In the overall evaluation section, if the evaluation of the Vickers hardness HV, the evaluation of the maximum height Rz of the surface roughness on the outer surface of the extruded pipe, and the evaluation of the maximum height Rz of the surface roughness on the outer surface of the drawn pipe were all "○", the overall evaluation was marked "○", and if there was even one "×", the overall evaluation was marked "×".

[0079] In Examples 1 to 3, the aluminum alloy constituting the casting material contains 10% by mass or more of scrap material having a predetermined composition, so the amount of new aluminum ingot required for preparing the aluminum alloy is reduced. Also, since the composition of the aluminum alloy is within the range of the aluminum alloy of the present invention, the hardness HV is high, and therefore high cylindricity is obtained, and the maximum height Rz of the extruded pipe and the drawn pipe is sufficiently small, and therefore the surface quality of the outer circumferential surface is high.

[0080] In Comparative Example 1, the aluminum alloy constituting the cast material has a low Si content, and therefore the hardness HV is low, and therefore high cylindricity cannot be obtained.

[0081] In Comparative Example 2, the aluminum alloy constituting the cast material had an excessive Si content, so that excess Si crystallized in the metal structure, and as a result, the maximum heights Rz of the extruded pipe and the drawn pipe were large, and the surface quality of the outer circumferential surface was poor.

[0082] In Comparative Example 3, the aluminum alloy constituting the cast material had a low Fe content, so that the hardness HV was low and high cylindricity was not obtained. In addition, the low Fe content resulted in a small amount of Al-Fe-Si intermetallic compounds being generated, which resulted in an excess of Si being distributed, resulting in a large maximum height Rz of the drawn pipe and poor surface quality on the outer circumferential surface.

[0083] In Comparative Example 4, the aluminum alloy constituting the cast material had an excessively large Fe content, so that coarse Al-Fe-Si intermetallic compounds were crystallized in the metal structure, and as a result, the maximum heights Rz of the extruded pipe and the drawn pipe were large, and the surface quality of the outer circumferential surface was poor.

[0084] In Comparative Example 5, the aluminum alloy constituting the cast material had a low Si content and Fe content, and therefore the hardness HV was low, and therefore high cylindricity could not be obtained.

[0085] In Comparative Example 6, the aluminum alloy constituting the cast material had excessive Si and Fe contents, so that excess Si and coarse Al-Fe-Si intermetallic compounds were crystallized in the metal structure, and as a result, the maximum heights Rz of the extruded pipe and the drawn pipe were large, and the surface quality of the outer circumferential surface was poor. [Industrial Applicability]

[0086] The present invention can be utilized in an aluminum alloy for a photosensitive drum substrate, a method for manufacturing a photosensitive drum substrate, and the like. [Explanation of symbols]

[0087] 1: Billet (aluminum alloy casting material) 2: Aluminum alloy extrusion tube 3: Aluminum alloy drawn pipe 10: Direct extrusion processing equipment 20: Drawing equipment 30: Photosensitive drum base

Claims

1. Si: 0.10 to 0.50% by mass, Fe: 0.10 to 0.80% by mass, Cu: 0.05 to 0.20% by mass, Mn: 1.0 to 1.50% by mass, Mg: 0 to 0.05% by mass, Cr: 0 to 0.05% by mass, Zn: 0 to 0.10% by mass, Ti: 0.001 to 0.15% by mass, An aluminum alloy for a photosensitive drum substrate, the balance of which is composed of Al and unavoidable impurities, Si: 0.10 to 0.80% by mass, Fe: 0.10 to 1.50% by mass, Cu: 0.01 to 0.30% by mass, Mn: 0.01 to 1.50% by mass, Mg: 0 to 0.03% by mass, Cr: 0 to 0.10% by mass, Zn: 0 to 0.10% by mass, Ti: 0.001 to 0.15% by mass, An aluminum alloy for a photosensitive drum substrate, comprising 10 mass % or more of aluminum alloy scrap material, the balance of which is aluminum and unavoidable impurities, as a material for the aluminum alloy for a photosensitive drum substrate.

2. The aluminum alloy casting material for a photosensitive drum substrate according to claim 1 is an aluminum alloy extrusion material obtained by extrusion processing, An aluminum alloy extruded tube for use as a photosensitive drum substrate, the maximum height Rz of the surface roughness on the outer circumferential surface being 10.0 μm or less.

3. The aluminum alloy extruded tube according to claim 2 is an aluminum alloy drawn tube obtained by drawing, The photosensitive drum substrate has a maximum height Rz of surface roughness on the outer circumferential surface of the aluminum alloy drawn tube of 1.0 μm or less.

4. 4. The photosensitive drum substrate according to claim 3, wherein the outer peripheral surface of said aluminum alloy drawn tube has a Vickers hardness HV of 53 or more.

5. Si: 0.10 to 0.50% by mass, Fe: 0.10 to 0.80% by mass, Cu: 0.05 to 0.20% by mass, Mn: 1.0 to 1.50% by mass, Mg: 0 to 0.05% by mass, Cr: 0 to 0.05% by mass, Zn: 0 to 0.10% by mass, Ti: 0.001 to 0.15% by mass, A method for manufacturing a photosensitive drum substrate made of an aluminum alloy having a composition with the balance being Al and unavoidable impurities, comprising the steps of: a casting step of obtaining a cast material made of the aluminum alloy by casting a casting raw material, The casting raw material is Si: 0.10 to 0.80% by mass, Fe: 0.10 to 1.50% by mass, Cu: 0.01 to 0.30% by mass, Mn: 0.01 to 1.50% by mass, Mg: 0 to 0.03% by mass, Cr: 0 to 0.10% by mass, Zn: 0 to 0.10% by mass, Ti: 0.001 to 0.15% by mass, A method for manufacturing a photosensitive drum substrate, comprising: a) forming a photosensitive drum substrate by depositing aluminum alloy scrap material in an amount of 10% by mass or more, the remainder of the scrap material being aluminum and unavoidable impurities;

6. 6. The method for producing a photosensitive drum substrate according to claim 5, further comprising an extrusion process step of extruding said casting material to obtain an aluminum alloy extruded tube having a maximum height Rz of surface roughness on its outer periphery of 10.0 [mu]m or less.

7. 7. The method for producing a photosensitive drum substrate according to claim 6, further comprising a drawing step of drawing the aluminum alloy extruded tube to obtain an aluminum alloy drawn tube having a maximum height Rz of surface roughness on its outer periphery of 1.0 [mu]m or less.

8. 8. The method for producing a photosensitive drum substrate according to claim 7, wherein the aluminum alloy drawn tube has an outer circumferential surface having a Vickers hardness HV of 53 or more in the drawing process.

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