JP5164696B2 - Aluminum alloy drawn material - Google Patents

Description

  The present invention relates to an aluminum alloy drawn material such as a drawn tube and a photosensitive drum base, a manufacturing method thereof, and an aluminum alloy used for the drawn material.

  The Al-Mn alloy, which is a 3000 series aluminum alloy, increases strength while maintaining the workability and corrosion resistance of pure aluminum by adding Mn to pure aluminum. It is used. In recent years, Al-Mn alloys have been used as materials for photosensitive drum bases mounted on electrophotographic apparatuses such as laser beam printers, copying machines, and facsimile machines.

  Such an Al—Mn alloy is formed into a desired shape by performing hot working such as hot rolling or hot extrusion after casting. Prior to hot working, the billet of the Al-Mn alloy obtained by casting is heat-treated at a temperature of 450 to 610 ° C. for about 10 to 20 hours, thereby homogenizing the billet components and structure. Has been.

Examples of such aluminum alloys containing Sc and Mn include aluminum alloys disclosed in Japanese Patent Application Laid-Open No. 2006-336104 and aluminum alloy spring materials disclosed in Japanese Patent Application Laid-Open No. 2000-328209. Known (see Patent Documents 1 and 2). This alloy retains the strength of the alloy by Al ₃ X dispersed crystals.

Japanese Patent Application Laid-Open No. 61-159544 discloses an aluminum alloy containing Mn as an aluminum alloy for precision machining (see Patent Document 3).
JP 2006-336104 A JP 2000-328209 A JP-A 61-159544

  By the way, the photosensitive drum substrate is formed of a drawn tube manufactured by sequentially extruding and drawing an Al—Mn alloy material, for example. In this case, it is possible with the current technology to perform drawing processing so that the outer surface of the photosensitive drum substrate is close to a mirror surface. However, with the current technology, it has been very difficult to reduce the surface roughness Ry to 1.0 μm or less (that is, Ry ≦ 1.0 μm) as the surface properties of the outer surface of the substrate. The reason is that the surface roughness increases due to oil pits generated on the outer surface of the substrate during the drawing process. The oil pits are fine irregularities generated on the outer surface of the substrate due to the drawing lubricant supplied to the outer surface of the material during the drawing process, and the oil pits are regarded as surface defects in the photosensitive drum substrate. Therefore, in order to reduce surface defects on the outer surface of the photosensitive drum substrate, it is necessary to reduce the oil pit size by reducing the depth and area of the oil pit. However, in the conventional Al-Mn alloy, crystal grains grow during processing, and coarse oil pits are generated from the growth. Therefore, it is very difficult to reduce the surface roughness from a certain level to a smaller one. It was difficult.

  In recent years, with the improvement in performance of laser beam printers, high quality has been required for the surface properties of the outer surface of the photosensitive drum substrate. In the case of this application, the surface texture may be considered as surface roughness representing the degree of unevenness on the outer surface.

  However, even if a photosensitive drum substrate is manufactured using a conventional Al-Mn alloy, a photosensitive drum substrate having high surface properties cannot be obtained.

  The present invention has been made in view of the above-described technical background, and an object thereof is to provide an aluminum alloy drawn material having high surface properties, a method for producing the same, and an aluminum alloy used for the drawn material. .

  As a result of intensive studies to achieve the above object, the present inventor has found that many oil pits generated when drawing the aluminum alloy material are generated not in the crystal grains but in the grain boundaries. Therefore, by controlling the size of the crystal grains, the oil pit generation state can be controlled. Based on such knowledge, the present inventor has completed the present invention.

  The present invention provides the following means.

[1] An aluminum alloy drawn material produced by sequentially extruding and drawing an aluminum alloy material,
An aluminum alloy drawn material characterized in that the average depth of oil pits generated on the surface is 5 μm or less.

[2] The aluminum alloy drawn material as recited in the aforementioned Item 1, wherein the average area of the oil pits is 50 μm ² or less.

[3] An aluminum alloy drawn material produced by sequentially extruding and drawing an aluminum alloy material,
An aluminum alloy drawn material characterized in that the average area of oil pits formed on the surface is 50 μm ² or less.

  [4] The aluminum alloy drawn material according to any one of items 1 to 3, wherein the average crystal grain size is 50 μm or less.

[5] Aluminum alloy
Mn: 1.0 to 1.8% by mass, Cu: 0.3 to 0.5% by mass, Fe: 0.05 to 0.3% by mass, Sc: 0.05 to 0.2% by mass, Zr: 5. The aluminum alloy drawn material according to any one of the preceding items 1 to 4, comprising 0.05 to 0.2% by mass, the balance comprising Al and inevitable impurities.

[6] Aluminum alloy
Mn: 1.0 to 1.8% by mass, Cu: 0.3 to 0.5% by mass, Fe: 0.05 to 0.3% by mass, Sc: 0.05 to 0.2% by mass, Zr: The aluminum alloy drawn material according to any one of the preceding items 1 to 4, comprising 0.05 to 0.2% by mass, Si: 0.25 to 0.35% by mass, and the balance comprising Al and inevitable impurities.

  [7] The aluminum alloy drawn material according to any one of items 1 to 6, wherein the drawn material is a drawn tube.

  [8] The aluminum alloy drawing material as described in any one of 1 to 6 above, wherein the drawing material is a photosensitive drum substrate.

[9] A method for producing an aluminum alloy drawn material, in which an aluminum alloy material is sequentially extruded and drawn.
Aluminum alloy
Mn: 1.0 to 1.8% by mass, Cu: 0.3 to 0.5% by mass, Fe: 0.05 to 0.3% by mass, Sc: 0.05 to 0.2% by mass, Zr: A method for producing an aluminum alloy drawn material, comprising 0.05 to 0.2% by mass, the balance comprising Al and inevitable impurities.

[10] A method for producing an aluminum alloy drawn material by sequentially extruding and drawing an aluminum alloy material,
Aluminum alloy
Mn: 1.0 to 1.8% by mass, Cu: 0.3 to 0.5% by mass, Fe: 0.05 to 0.3% by mass, Sc: 0.05 to 0.2% by mass, Zr: The manufacturing method of the aluminum alloy drawing material characterized by including 0.05-0.2 mass%, Si: 0.25-0.35 mass%, and remainder consisting of Al and an unavoidable impurity.

  [11] The method for producing an aluminum alloy drawn material according to 9 or 10 above, wherein the drawing process is performed with the diameter reduction rate of the material set to 20 to 40%.

  [12] The method for producing an aluminum alloy drawn material according to any one of items 9 to 11, wherein the drawing temperature is set to 100 to 200 ° C and the drawing is performed.

  [13] The method for producing an aluminum alloy drawn material according to any one of items 9 to 12, wherein the drawn material is a drawn tube.

  [14] The method for producing an aluminum alloy drawn material according to any one of items 9 to 12, wherein the drawn material is a photosensitive drum base.

  [15] Mn: 1.0 to 1.8% by mass, Cu: 0.3 to 0.5% by mass, Fe: 0.05 to 0.3% by mass, Sc: 0.05 to 0.2% by mass , Zr: 0.05 to 0.2% by mass, and the balance is made of Al and inevitable impurities.

  [16] Mn: 1.0 to 1.8% by mass, Cu: 0.3 to 0.5% by mass, Fe: 0.05 to 0.3% by mass, Sc: 0.05 to 0.2% by mass , Zr: 0.05 to 0.2% by mass, Si: 0.25 to 0.35% by mass, the balance being made of Al and inevitable impurities.

  [17] The aluminum alloy according to 15 or 16 above, which is used for materials that are sequentially extruded and drawn.

  [18] The aluminum alloy as described in any one of 15 to 17 above, which is used as a material for a photosensitive drum substrate.

  The present invention has the following effects.

  In the invention of [1], an aluminum alloy drawn material having high surface properties can be provided.

  In the invention of [2], a drawn material having extremely high surface properties can be provided.

  In the invention of [3], an aluminum alloy drawn material having high surface properties can be provided.

  In the invention of [4], the surface properties of the drawn material can be reliably increased.

  In the invention of [5], the surface properties of the drawn material can be reliably increased.

  In the invention of [6], the surface properties of the drawn material can be reliably increased. Furthermore, excellent workability is imparted to the aluminum alloy material for producing the drawn material. Therefore, the extrusion process and the drawing process for manufacturing this drawing process can be easily performed.

  In the invention of [7], an aluminum alloy drawn tube having high surface properties can be provided as the drawn material.

  In the invention of [8], an aluminum alloy photosensitive drum substrate having high surface properties can be provided as a drawing material.

  In the invention [9], the aluminum alloy contains a predetermined amount of Mn, Cu, Fe, Sc, and Zr, whereby a drawn material having high surface properties can be produced. In particular, the aluminum alloy contains 0.05 to 0.2% by mass of Sc, so that the crystal grains can be refined. Thereby, the depth and area of the oil pit can be reduced during the drawing process, and the surface properties of the drawn material can be increased. Furthermore, excellent workability (e.g., extrudability and drawing processability) can be imparted to the aluminum alloy material, so that extrusion and drawing processes can be easily performed.

  In the invention of [10], the aluminum alloy in the invention of [9] contains a predetermined amount of Si, whereby the strength of the aluminum alloy material can be increased and the surface properties of the drawn material can be improved reliably. Can be made.

  In the invention [11], the surface properties of the drawn material can be reliably improved by setting the material diameter reduction ratio to 20% or more. In addition, by setting the diameter reduction rate to 40% or less, it is possible to reliably prevent the material from being accidentally cut during the drawing process. Furthermore, the size of the drawn material can be reliably controlled by setting the diameter reduction rate to 20 to 40%.

  In the invention of [12], by setting the drawing temperature to 100 to 200 ° C., it is possible to reliably control the surface properties, lubrication state, and crystal grain refinement of the drawn material.

  In the invention of [13], an aluminum alloy drawn tube having high surface properties can be produced as the drawn material.

  In the invention of [14], a photosensitive drum substrate made of an aluminum alloy having high surface properties can be manufactured as a drawing material.

  In the invention of [15], the aluminum alloy contains Mn, Cu, Fe, Sc, and Zr in predetermined amounts, so that the aluminum alloy can be suitably used as a material for products that require high surface properties. In particular, the aluminum alloy contains 0.05 to 0.2% by mass of Sc, so that the crystal grains can be refined. Thereby, when this aluminum alloy is used as a material for producing a drawn material, for example, the depth and area of the oil pit can be reduced during the drawing process, thereby increasing the surface properties of the drawn material. be able to. Furthermore, excellent workability (eg, extrudability and drawability) can be imparted to the aluminum alloy.

  In the invention of [16], the strength of the aluminum alloy can be increased by containing a predetermined amount of Si in the aluminum alloy according to the invention of [15]. Furthermore, when this aluminum alloy is used as a material for producing a drawn material, for example, the surface properties of the drawn material can be improved reliably.

  In the invention of [17], the surface properties of the drawn material such as the drawn tube and the photosensitive drum base which are produced by the extrusion process and the drawing process can be enhanced.

  In the invention [18], the surface properties of the outer surface of the photosensitive drum substrate can be enhanced.

  Next, an embodiment of the present invention will be described.

  In FIG. 1, reference numeral 1 denotes a photosensitive drum substrate as a drawing material (drawing tube in detail) according to an embodiment of the present invention.

  The photosensitive drum substrate 1 is composed of a drawn tube having an annular cross section manufactured by sequentially extruding and drawing a material of an aluminum alloy according to an embodiment of the present invention. More specifically, the photosensitive drum substrate 1 is composed of an uncut high-precision aluminum alloy drawn tube called an ED tube (Eextrusion Drawing tube) manufactured through an extrusion process and a drawing process in order.

  The photosensitive drum substrate 1 is mounted on, for example, a laser beam printer, a copying machine, a facsimile machine or the like as an electrophotographic apparatus, and a predetermined film such as an OPC (organic photoconductor) film is formed on the outer surface thereof. It is to be coated. The outer diameter of the photosensitive drum substrate 1 is, for example, 15 to 50 mm, its thickness is, for example, 0.5 to 3 mm, and its length is, for example, 200 to 500 mm.

  The aluminum alloy of this embodiment used for the material of the photosensitive drum substrate 1 falls within the category of Al—Mn alloys, specifically, Mn: 1.00-1.80 mass%, Cu: 0.30 to 0.50% by mass, Fe: 0.05 to 0.30% by mass, Sc: 0.05 to 0.20% by mass, Zr: 0.05 to 0.20% by mass, If necessary, Si: 0.25 to 0.35 mass% is contained, and the balance is made of Al and inevitable impurities. That is, this aluminum alloy contains Mn, Cu, Fe, Sc, and Zr as essential additive elements, and further contains Si as an optional additive element as necessary.

  The reason why the Al—Mn alloy is selected as the material for the photosensitive drum substrate 1 is that the Al—Mn alloy is excellent in formability and corrosion resistance, and further, the strength is about 10% higher than that of the 1000 alloy. is there.

  Further, Sc added to the aluminum alloy of the present embodiment alone has an effect of suppressing recrystallization. By adding Sc to the aluminum alloy, recrystallization formed on the surface portion by processing such as drawing processing can be suppressed, thereby leaving a fine crystal structure up to the final product. Furthermore, by adding other elements (Mn, Cu, Fe, Zr, Si), the surface roughness can be maintained at a predetermined value while maintaining the material characteristics.

  Hereinafter, the significance of adding each element to the aluminum alloy and the reason for limiting the addition concentration (that is, the content concentration) of each element will be described.

<About Cu>
Cu is an element that contributes to improving the strength in each temperature region by the solid solution strengthening action. The addition concentration of Cu is set to 0.30 to 0.50 mass%. If the amount is less than 0.30% by mass, the above effect is poor.

<About Mn>
Mn is an element that increases the recrystallization temperature by forming a fine intermetallic compound with Fe or the like contained in aluminum, and further contributes to the improvement of strength. The addition concentration of Mn is set to 1.00-1.80 mass%. If it is less than 1.00% by mass, the above effect is poor, and if it exceeds 1.80% by mass, the corrosion resistance may be lowered.

<About Fe>
Fe is an element that contributes to refinement of crystal grains and improvement in strength. The additive concentration of Fe is set to 0.05 to 0.30 mass%. If the amount is less than 0.05% by mass, the above effect is poor, and if it exceeds 0.30% by mass, a coarse crystallized product is formed, which adversely affects the surface properties.

<About Sc>
Sc is an element that exhibits the effect of suppressing recrystallization by adding this alone, that is, an element that prevents the coarsening of crystal grains. Furthermore, Sc produces Al ₃ Sc having an L1 ₂ structure, and thereby has the effect of accelerating miniaturization when generating crystal grains and improving the strength. The additive concentration of Sc is set to 0.05 to 0.20 mass%. If the amount is less than 0.05% by mass, the above effect is poor, and if it exceeds 0.20% by mass, a large amount of dispersed phase is generated, which increases the strength too much, which is not preferable. Furthermore, when it exceeds 0.20 mass%, it is not appropriate also in terms of cost. A particularly desirable range of Sc addition concentration is 0.15 to 0.20 mass%.

<About Zr>
Zr is an element that can be replaced with Sc of Al ₃ Sc formed when Sc is added. Al ₃ Zr becomes a strengthening phase like Al ₃ Sc and improves the strength. The additive concentration of Zr is set to 0.05 to 0.20 mass%. If the amount is less than 0.05% by mass, the above effect is poor. If the amount exceeds 0.20% by mass, the amount of substitution with Sc increases, and an excessive dispersed phase is formed. As a result, the recrystallization suppressing effect of Sc decreases. Therefore, it is not preferable.

<About Si>
Si is an element that improves castability and further contributes to improvement in strength. Since Si is an optional additive element as described above, the addition concentration of Si is set to 0% by mass or more, preferably 0 to 0.30% by mass, and particularly preferably 0.25 to 0.30% by mass. % Is set. If the amount is less than 0.25% by mass, the above effect is poor, and if it exceeds 0.30% by mass, a coarse crystallized product is formed, which adversely affects the surface properties.

  As described above, the aluminum alloy of the present embodiment is excellent for generation of fine crystal grains and suppression of coarsening of crystal grains by recrystallization. In particular, the aluminum alloy material is sequentially extruded. The photosensitive drum substrate 1 manufactured by processing and drawing processing has a very good influence on the dispersion of oil pits generated on the outer surface thereof.

This aluminum alloy contains Sc, and by adjusting the material composition, the fine effect of the crystal grains is promoted at the time of casting, and further, the crystal grains generated in the subsequent plastic processing (eg, extrusion processing, drawing processing). More specifically, the growth of crystal grains is suppressed so that the average crystal grain size is 50 μm or less. As a result, the depth and area of the oil pits generated on the outer surface of the photosensitive drum substrate 1 can be reduced, and the oil pits can be uniformly dispersed to reduce the generation density of the oil pits. . Specifically, the average depth of the oil pits can be 5 μm or less, further 1 μm or less, and the average area of the oil pits can be 50 μm ² or less, further 20 μm ² or less.

In the photosensitive drum substrate 1, the lower limit of the average oil pit depth is 0 μm, and the lower limit of the average oil pit area is 0 μm ² . Further, the lower limit of the average crystal grain size is desirably smaller, specifically 10 μm.

  Therefore, the aluminum alloy can be suitably used as a material for other drawing materials (for example, drawing tubes) that require high surface properties, such as the photosensitive drum substrate 1.

  Here, the oil pit will be described below.

  During the drawing process, the lubricating oil is introduced in a wedge shape at the contact portion between the material and the mold. At this time, the lubricating oil is trapped in a minute recess on the surface of the material. When the raw material is drawn in the lubrication state as it is, oil pits are formed as concave defects on the outer surface of the obtained photosensitive drum base. Note that when the processing temperature and the diameter reduction rate are in a predetermined condition, the oil pit size may be reduced by leaching out the lubricating oil that has entered the oil pit.

  As shown in FIG. 2, the oil pit 2 is different from other surface concave defects in that the surface portion 3 of the material folded at the time of diameter reduction remains at the bottom. Furthermore, the oil pit 2 is different from other surface concave defects in that the oil pit 2 may remain in a larger area than other surface concave defects. In FIG. 2, the drawing direction H is a direction perpendicular to the paper surface of FIG.

  When the oil pit 2 is generated on the outer surface 1 a of the photosensitive drum substrate 1, the surface roughness of the outer surface 1 a is increased because the surface portion 3 of the folded material remains at the bottom of the oil pit 2. Furthermore, the oil pit 2 itself adversely affects the surface roughness. Therefore, the surface roughness of the outer surface 1a is larger than that when other surface concave defects are generated on the outer surface 1a. Therefore, reducing the depth and area of the oil pit 2 generated on the outer surface 1a of the photosensitive drum substrate 1 means that the photosensitive drum substrate 1 having a small surface roughness of the outer surface 1a, that is, the photosensitive drum substrate 1 having high surface properties. Is very important in obtaining. When the average depth and the average area of the oil pit 2 are larger than predetermined values, the oil pit 2 becomes inappropriate as a photosensitive drum base.

  Next, a method for manufacturing the photosensitive drum base 1 using the aluminum alloy material of this embodiment will be described below.

  First, the billet of this aluminum alloy is manufactured by casting. This process is called “casting process”. Next, the billet is hot-extruded to obtain a hollow material having a circular cross section (specifically, a raw tube). This process is called an “extrusion process”. Next, this material is cold drawn to obtain a long photosensitive drum substrate as a drawn tube. This process is called “drawing process”. Then, the photosensitive drum substrate 1 shown in FIG. 1 can be obtained by cutting the long photosensitive drum substrate into a predetermined length.

  In the drawing process, it is desirable to perform the drawing process by setting the material diameter reduction ratio to 20 to 40%. The reason is as follows.

  By setting the diameter reduction ratio of the material to 20% or more, the surface properties of the outer surface 1a of the obtained photosensitive drum substrate 1 can be reliably improved. Further, by setting the diameter reduction rate to 40% or less, it is possible to reliably prevent the material from being accidentally cut (ie, cut off) during the drawing process. Furthermore, the dimension of the photosensitive drum base | substrate 1 obtained can be reliably controlled by setting a diameter reduction rate to 20 to 40%.

The diameter reduction ratio R of the material is expressed by the following equation (1), where D _{0 is} the outer diameter of the material before drawing and D ₁ is the outer diameter of the material after drawing (that is, the photosensitive drum base 1). Calculated.

R = {1- (D ₁ / D ₀ )} × 100% (1)

  Furthermore, in the drawing process, it is desirable to perform the drawing process by setting the material drawing temperature to 100 to 200 ° C. The drawing temperature varies depending on the contact state of the material with the mold, the diameter reduction ratio of the material, the type of lubricating oil, etc. In the case of this aluminum alloy material, the drawing temperature is set to 100 to 200. By setting the temperature to 0 ° C., it is possible to reliably control the surface state, lubrication state, and crystal grain refinement of the outer surface of the obtained photosensitive drum substrate.

As described above, by manufacturing the photosensitive drum base 1 using the aluminum alloy material of the present embodiment, the average crystal grain size of the photosensitive drum base 1 can be reduced, more specifically, 50 μm or less. . Thereby, the average depth of the oil pits 2 generated on the outer surface 1a of the photosensitive drum substrate 1 can be 5 μm or less, and the average area of the oil pits 2 can be 50 μm ² or less.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be variously modified.

  For example, in this embodiment, the aluminum alloy is used as a material for the photosensitive drum base, but in the present invention, it may be used as a material for other drawing materials.

  Next, some examples and comparative examples of the present invention will be described below.

  As a material for the photosensitive drum base, aluminum alloy billets having chemical components shown in Table 1 were produced by casting. Then, the billet was homogenized by heat-treating the billet. Subsequently, the billet was hot-extruded to obtain a hollow material (element tube) having an annular cross section. In this extrusion process, the extrusion process was performed with the billet temperature set to 500 ° C. and the extrusion speed set to 30 m / min. Subsequently, the raw material was cold drawn to obtain a long photosensitive drum substrate. The photosensitive drum substrate has an outer diameter of 16 mm and a wall thickness of 0.8 mm. In this drawing process, the drawing process was performed with the drawing process temperature set to 100 to 150 ° C. and the material diameter reduction ratio set to 30 to 40%. In addition, the kinematic viscosity and supply amount of the drawing lubricant used during the drawing process are set to be constant, so that the factors affecting the change in the surface roughness of the outer surface of the photosensitive drum substrate Only material was used. Next, the average depth and average area of oil pits generated on the outer surface of the photosensitive drum substrate are measured, the surface roughness Ry of the outer surface of the photosensitive drum substrate, the refinement of crystal grains, the extrudability and the tensile strength. Were evaluated respectively. The results are shown in Table 1.

  In Table 1, each of the aluminum alloys of Examples 1 to 7 and Comparative Examples 1 to 4 contains a predetermined amount of the elements described in the chemical component column, and the remainder is made of aluminum and inevitable impurities.

  Regarding the average depth of oil pits generated on the outer surface of the photosensitive drum substrate, those having an average depth of 5 μm or less are indicated by “◯” and those having an average depth exceeding 5 μm are indicated by “X”.

As for the average area of the oil pits, those having an average area of 50 μm ² or less are indicated by “◯” and those having an average area exceeding 50 μm ² are indicated by “x”.

  As for the surface roughness Ry of the outer surface of the photosensitive drum substrate, the surface roughness Ry is “◯” when the surface roughness Ry is 1.0 μm or less (that is, Ry ≦ 1.0 μm), and exceeds 1.0 μm and 1.5 μm or less ( That is, 1.0 <Ry ≦ 1.5 μm) is represented by “Δ”, and one exceeding 1.5 μm (that is, Ry> 1.5 μm) is represented by “x”. As a result, there was no “x” in all examples and comparative examples. The surface roughness Ry was measured according to JIS (Japanese Industrial Standard) B 0601 (1994).

  Regarding the refinement of crystal grains, those having an average crystal grain size of 50 μm or less are represented by “◯”, those having an average crystal grain size exceeding 50 μm and 100 μm or less are represented by “Δ”, and those having an average crystal grain size exceeding 100 μm are represented by “X”.

Regarding the extrudability, when the pressing ratio was 50, the pressure of 13 MPa (130 kgf / cm ² ) or less was indicated by “◯”, and the pressure exceeding 13 MPa was indicated by “Δ”.

The tensile strength is the tensile strength of the billet of aluminum alloy. The tensile strength is increased by adding Sc to the aluminum alloy. This is due to the effect of refinement of crystal grains and the effect of suppressing the movement of dislocation due to the crystallized product of Al ₃ Sc.

  Here, the measuring method of the average depth of the oil pit is as follows.

  A cross section perpendicular to the drawing direction (that is, the length direction) of the photosensitive drum substrate was polished by using a commercially available sample section preparation device (CP: Cross Section Polisher). Thereafter, the cross section was observed with a SEM at a magnification of 1500 times, and the depth of any one oil pit present in the observation field was measured. This measurement was performed 10 times in total, changing the observation location of the SEM in the cross section each time. And the average value of the measured value of the depth of ten oil pits obtained in this way was defined as “average oil pit depth”.

  The method for measuring the average area of the oil pit is as follows.

  The outer surface of the photosensitive drum substrate was observed with a digital microscope in a field of view of 400 μm × 300 μm, and binarized using a commercially available image processing analyzer. Thereafter, the number and area of oil pits present in the observation field were measured. Then, the area per oil pit was calculated based on these measured values, and this was defined as “average area of oil pits”.

  The method for measuring the average crystal grain size is as follows.

  A cross section perpendicular to the drawing direction of the photosensitive drum substrate was etched. Thereafter, the average crystal grain size was calculated by observing the cross section using a commercially available image processing analyzer (trade name: “LUZEX”). In this calculation, the equivalent circle diameter was applied as the crystal grain size.

  As can be seen from Table 1, when the additive concentration of Sc in the aluminum alloy is too small, the effect of refining crystal grains is small, whereas when the additive concentration of Sc is too large, the fine effect of crystal grains is Although it increased, it was confirmed that the extrudability deteriorated.

Further, as shown in Table 1, in each of Examples 1 to 7, the average crystal grain size of the photosensitive drum substrate 1 is 50 μm or less, and the average depth of oil pits generated on the outer surface of the photosensitive drum substrate is also shown. The average area of the oil pits was 50 μm ² or less.

  As described above, the aluminum alloy according to the present invention can control the state of oil pits by the effect of refining crystal grains by adding a predetermined amount of Sc, and thus has a high surface property. It is possible to produce a drawn material such as.

  INDUSTRIAL APPLICABILITY The present invention can be used for an aluminum alloy drawn material such as a drawn tube and a photosensitive drum base, a manufacturing method thereof, and an aluminum alloy used for the drawn material.

FIG. 1 is a perspective view of a photosensitive drum substrate as an aluminum alloy drawn material according to an embodiment of the present invention. FIG. 2 is an enlarged schematic cross-sectional view of an outer surface portion of the photosensitive drum base.

Explanation of symbols

1: Photosensitive drum substrate (drawing material, drawing tube)
2: Oil pit

Claims (6)

Aluminum alloy drawn material produced by sequentially extruding and drawing aluminum alloy material,
The average depth of the oil pits generated in the surface Ri der less 5 [mu] m,
Aluminum alloy
Mn: 1.0 to 1.8% by mass, Cu: 0.3 to 0.5% by mass, Fe: 0.05 to 0.3% by mass, Sc: 0.05 to 0.2% by mass, Zr: An aluminum alloy drawn material comprising 0.05 to 0.2 mass%, the balance being made of Al and inevitable impurities . Aluminum alloy drawn material produced by sequentially extruding and drawing aluminum alloy material,
The average depth of oil pits generated on the surface is 5 μm or less,
Aluminum alloy
Mn: 1.0 to 1.8% by mass, Cu: 0.3 to 0.5% by mass, Fe: 0.05 to 0.3% by mass, Sc: 0.05 to 0.2% by mass, Zr: An aluminum alloy drawn material comprising 0.05 to 0.2% by mass, Si: 0.25 to 0.35% by mass, the balance comprising Al and inevitable impurities . The aluminum alloy drawn material according to claim 1 or 2 , wherein an average area of the oil pits is 50 µm ² or less.   The aluminum alloy drawn material according to any one of claims 1 to 3, wherein the average crystal grain size is 50 µm or less. The aluminum alloy drawn material according to any one of claims 1 to 4 , wherein the drawn material is a drawn tube. The aluminum alloy drawing material according to any one of claims 1 to 4 , wherein the drawing material is a photosensitive drum base.

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