JPH03291347A - Aluminum sheet material for photosensitive drum - Google Patents

Abstract

PURPOSE:To stably obtain an Al sheet material for a photosensitive drum easily executable of DI working, in which the roughening of the surface can be prevented as well as having specified earing ratio by specifying the compsn. constituted of Fe, Si and Al and regulating its grain size to a specified one. CONSTITUTION:This Al sheet material for a photosensitive drum has a compsn. contg., by weight, 0.3 to 1.0% Fe, 0.03 to 0.2% Si as well as Fe/Si>3 and the balance Al with inevitable impurities and has <=35mum average grain size of sheet thickness, 2 drawing ratio (blank diameter/punch diameter) and <=3% earing ratio. The sheet material is easily executable of drum forming by DI working and is free from the generation of the roughening of the surface. The above Al sheet material can be obtd. by casting an Al material having a prescribed chemical compsn., thereafter subjecting the material to two stage soaking treatment at about 570 to 620 deg.C and at 450 to 530 deg.C, thereafter subjecting it to hot finish rolling at about 230 to 320 deg.C and thereafter executing cold rolling of about >=50%.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a photosensitive drum material formed into a cylindrical shape by drawing an aluminum plate material and then ironing the material. (Prior Art and Problems to Be Solved) Conventionally, cylindrical products made of aluminum, such as photosensitive drums, have been generally made into pipe shapes by extrusion or drawing. However, from the viewpoint of reducing the thickness of the product and improving the productivity of the processing process, some products may be made from aluminum plates by DI processing (Drawing and Ir.ning). In this case, it is necessary to maintain a high level of dimensional accuracy and surface quality.
It is desirable to use the aluminum material proposed in No. 2-50539. However, pure aluminum such as 1100 is sometimes used to reduce the deformation resistance during DI processing, thereby reducing the capacity of machines such as presses, and to simplify the processing process. Since the plate thickness is relatively thick, such as 2 to 4 mm, it is difficult to prevent rough skin and to stably obtain a material with a selvage ratio of 3% or less. An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an aluminum plate material for photosensitive drums that can be easily subjected to DI processing, can prevent rough skin, and can stably obtain a selvage ratio of 3% or less. It is something to do. (Means for Solving the Problems) In order to solve the above-mentioned problems, the inventors of the present invention have conducted intensive research on the component composition and manufacturing conditions of aluminum materials, and have hereby accomplished the present invention. That is, the aluminum plate material for a photosensitive drum according to the present invention contains Fe: 0.3 to 1.0% and Si: 0.03 to 0.0%.
2 wt%, provided that Fe/Si > 3, the balance is Al and unavoidable impurities, the plate thickness average crystal grain size is 35μ or less, drawing ratio (blank diameter / punch diameter) 2 with an ear rate of 3% or less. The present invention will be explained in more detail below. (Function) First, the reason for limiting the chemical components in the present invention will be explained. Fe: 0.3-1. Q% Fe is an important element that affects directionality (edge ratio), grain refinement, and corrosion resistance, and although directionality is determined by the synergistic effect with Si, it is stable at less than 0.3%. It is difficult to obtain low directionality (±3% or less), there is no effect on crystal grain refinement, and if it exceeds 1.0%, problems arise in corrosion resistance. Therefore, the amount of Fe is 0.3~
The range is 1.0%. 5ilo, 03 to 0.2% Si has little effect when contained alone, but the ratio with Fe, Fe/Si, has an effect on low directionality (±3% or less) and stable production. However, if it is less than 0.03%, expensive metal is used, which increases the cost, and the Fe/Si value fluctuates greatly due to slight variations in the amount of Si, leading to fluctuations in the selvedge ratio. So I don't like it. Also 0, 2
%, it becomes difficult to obtain low directivity (±3% or less). Therefore, the amount of Si is set in the range of 0.03 to 0.2%. However, Fe and Si need to satisfy Fe/Si>3. That is, as Fe/Si increases, the selvage ratio tends to be + (45° selvage in the rolling direction). However, Fe
/Si value of 3 is undesirable because it becomes - (edges parallel and perpendicular to the rolling direction) and it becomes difficult to maintain the edge ratio at 3% or less. Therefore, it is set as Fe/5i)3. Practically speaking, it is preferable to set Si: 0.05 to 0.15% - Fe: 0.45 to 0.75%, and it is designed to satisfy Fe/5i)3 within this range. Note that other elements may be contained to the extent of being impurities. A small amount of Ti (0.05
% or less) is preferable. Some amount of Cu (0,2
% or less) is effective in improving strength. Furthermore, the thickness average grain size of the aluminum plate is 3
It should be 5μ or less. This is directly related to rough skin, and
If it exceeds 5 μm, it is not preferable because it causes width roughness during ironing. Further, the reason why the selvage ratio is set to 3% or less at a drawing ratio (blank diameter/lb) of 2 is that when it exceeds 3%, the dimensional accuracy decreases rapidly. Next, a preferred method for producing an aluminum plate material having the above chemical components, structure, and selvage ratio will be described. Aluminum materials having the above chemical components are melted and cast using a conventional method, and then subjected to a soaking treatment, but it is preferable that the soaking treatment is performed by a combination of a high temperature soaking treatment and a low temperature soaking treatment under the following conditions. . (1) High-temperature soaking treatment held at 570 to 620°C for 2 hours or more (2) Low-temperature soaking at 450 to 530°C. However, the treatment time is not particularly limited. In this case, either a two-stage soaking process in which a low-temperature soaking process is performed immediately after a high-temperature soaking process, or a two-step soaking process in which the product is extracted outside the furnace after the high-temperature soaking process, and then a low-temperature soaking process is performed after cooling. . The coarsened and band-like structure during hot rolling (hereinafter referred to as “
In order to prevent the formation of "fiber structure"), it is preferable to lower the soaking temperature and hot-roll at a relatively low temperature. However, if recrystallization treatment (finish annealing) is performed after cold working, the crystal structure may become coarser. therefore,
First, a high-temperature soaking treatment is performed to sufficiently dissolve crystallized substances during casting. This allows for recrystallization treatment after cold working. Coarsening of the crystal structure can be prevented. Thereafter, a low-temperature soaking treatment is performed to promote fine precipitation of Fe and Si and to prevent the formation of a fiber structure during hot rolling. Note that after high-temperature soaking, hot rolling may be started after cooling to the above-mentioned low-temperature soaking temperature by cooling with water, emulsion oil, etc., but the temperature distribution within the slab may become uneven and the temperature may not reach a constant temperature. It is difficult to maintain, so it is not industrially viable. The finishing temperature of hot rolling in natural plate rolling is 230 to 320°C, and the finished hot rolling thickness is set within a range that can ensure a cold working rate of 50% or more. That is, when the hot rolling finishing temperature is lowered, the selvage ratio tends to be 10, and the required cold working ratio to keep the selvage ratio within 3% may be small. However, if the temperature is less than 230° C., the water-soluble rolling oil used in hot rolling tends to enter the coil during coil winding, which may lead to corrosion, which is not preferable. In addition, if the temperature exceeds 320°C, a recrystallized structure will occur if the temperature is allowed to cool naturally after hot rolling, and it may be necessary to increase the cold working rate, which is not preferable.
0°C is most preferred. In addition, regarding the hot finished plate thickness, increasing the cold working rate prevents surface roughness and makes it relatively easy to keep the selvage rate to 3% or less. But after hot rolling. When the cold working rate to the product plate thickness is less than 50%, the selvage ratio is often - (O'' in the rolling direction, selvage in the 90' direction),
It becomes difficult to maintain it within 3%, and if there is a recrystallized part in the structure after hot rolling, that part may become coarse during the recrystallization treatment after cold working. Also,
If the thickness of the product sheet is thick, it becomes necessary to increase the thickness of the hot-rolled sheet, which is unfavorable in terms of product quality (surface defects, etc.). Therefore, the hot finished plate thickness is set to have a cold working rate of 50% or more. After hot rolling, finish annealing is performed with or without cold rolling. Finish annealing conditions are not particularly limited. (Example) Next, an example of the present invention will be shown. Lost Seed, the aluminum alloy with the chemical composition shown in Table 1 contains 5
After performing soaking treatment for 90'CX 4 hours - +510''CX 1 hour, hot rolling was performed at a finishing temperature of 285 to 252°C, cold rolling was performed at a cold working rate of 70%, and final annealing (
360°C x 2 hours). Table 1 shows the average crystal grain size and coil inner ear ratio (reduction ratio of 50%) of the obtained aluminum plate material. From Table 1, Comparative Example No. 1 in which -Fe/Si is less than 3 has a - selvage ratio, and its variation is large. On the other hand, Ha 3 had a small ear percentage and did not have rough skin.

[Left below]

]11A Fe: 065%, Si: 0.07%, Fe/5i
= 4゜14 aluminum material was subjected to soaking treatment under the conditions shown in Table 2, then hot rolled at a finishing temperature of 245 to 280.
After hot rolling at ℃ and cold rolling at a cold working rate of 70%, finish annealing (360"CX 2 hours) was performed. The roughness of the surface after cupping and the coil inner ear ratio of the obtained aluminum plate material were measured. It is shown in Table 2. From Table 2, F!n3 has no rough skin and has a small ear percentage.

[Left space 1 below] 111 Aluminum materials having the chemical components shown in Table 3 are subjected to soaking treatment, hot rolling, and cold rolling under the conditions shown in the same table, and then finish annealing (360°C x 2 hours) was applied. Table 3 shows the relationship between cold working rate and edge rate. Among the aluminum plates obtained in h1 to Na4, those with selvage ratios within ±3% were subjected to DI processing, and good results were obtained with no rough skin. [Margins below] (Effects of the invention) As detailed above, according to the present invention, even if pure aluminum, which is easy to process by DI, is used, there is no roughening of the skin, and a photosensitive material with a selvage rate of 3% or less can be stably obtained. Aluminum plate material for drums can be provided.

Claims (1)

[Claims] Contains Fe: 0.3 to 1.0% and Si: 0.03 to 0.2 wt% (the same applies hereinafter), provided that Fe/
Si > 3, the balance is Al and unavoidable impurities, the plate thickness average crystal grain size is 35 μm or less, the drawing ratio (blank diameter / punch diameter) is 2, and the selvedge ratio is 3% or less. Features of aluminum plate material for photosensitive drums.