JPH0366382B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a deep-drawn aluminum alloy soft plate used for household appliances, etc., and a method for manufacturing the same. (Prior art and problems to be solved) Currently, thick materials of 1 mm or more, such as household utensils and copy drum materials manufactured by deep drawing, are
JISA1100 aluminum alloy soft material is often used. However, this A1100 alloy originally had poor directionality, and the so-called selvage during deep drawing was -10% to +10%.
It can occur in a range as large as %. This not only causes process cracks and surface scratches, but also increases the amount of trimming after deep drawing, resulting in low yield and high costs.
Therefore, an aluminum material with low directionality has been required. On the other hand, utensils are manufactured in small quantities and in a wide variety of products, each with a different thickness of material.If the selvage ratio varies greatly depending on the thickness of the material, processing conditions must be changed depending on the thickness of each material. There is a problem. For this reason, there has been a strong demand for a material whose selvedge ratio does not change even when the plate thickness changes. The present invention has been made in view of this situation, and even if the final cold working rate before the softening treatment is greatly changed, in other words, even for various product plate thicknesses, the selvedge generated during deep drawing can be reduced. Small change, -3
The object of the present invention is to provide an aluminum alloy soft plate having a thickness of 1 mm or more, which has extremely small directionality and excellent formability within the range of % to +3%, and a method for manufacturing the same. (Means for Solving the Problems) In order to achieve the above object, the present inventor has developed a method according to various product plate thicknesses, that is, the final cold working rate before softening treatment is in the range of 50 to 95%. As a result of intensive research in order to find a method that can significantly reduce the selvage rate even when the amount of Fe and Si is changed, we have determined that the crystal grain size of the ingot, homogenization treatment, and hot rolling conditions for aluminum alloys with specific compositions with regulated amounts of Fe and Si have been improved. It was discovered that the problem could be dealt with by controlling the problem, and the present invention was created based on this discovery. That is, in the present invention, Fe and Si are at each point A (Fe: 0.2%, Si: 0.6%) and B (Fe: 0.2%) shown in FIG.
%, Si: 0.1%), C (Fe: 0.9%, Si: 0.8%), D
(Fe: 0.4%, Si: 0.8%), and if necessary, further include Ti: 0.01~0.2%.
Mg: 0.2~20%, Cu: 0.05~0.5%, Mn: 0.03~
0.5%, Cr: 0.03 to 0.4%, and Zr: 0.01 to 0.2%, with the remainder consisting of Al and impurities, and after cold rolling at a processing rate of 50 to 95%, it becomes soft. The object of the present invention is to provide a soft aluminum alloy plate for deep drawing, which has a deep drawing edge of -3% to +3% and excellent directionality, and is characterized by being a chemically treated plate with a thickness of 1 mm or more. In addition, the present invention, which relates to the method for manufacturing the aluminum alloy soft plate, provides an aluminum alloy having the above composition, and an ingot having a crystal grain size of 3 mm or less.
℃×2～24hr treatment followed by 400～500℃×2×24hr
After 2 homogenization treatments, 480~250
Hot rolling between ℃ and then processing rate 50~95%
It is characterized by cold rolling and softening treatment. The present invention will be explained in more detail below. First, the reason for limiting the chemical components in the present invention will be explained. Si: Si is an important element that suppresses changes (variations) in deep drawing edges, and it exhibits a great effect when combined with Fe in the range shown in Figure 1. However, an amount of Si outside the range shown in FIG. 1 is not preferable because the effect is small or the effect is saturated. Fe: Fe, together with Si, is an important element that suppresses deep-drawn ears, but it exhibits a great effect when combined with Si in the range shown in Figure 1. However, an amount of Fe outside the range shown in FIG. 1 is not preferable because the effect is small or the effect is saturated. The range shown in Figure 1 is A (Fe: 0.2%,
Si: 0.6%), B (Fe: 0.2%, Si: 0.1%), C
(Fe: 0.9%, Si: 0.8%), D (Fe: 0.4%, Si: 0.8
%), which was discovered through experimental research by the present inventor. In the present invention, these Si and Fe are essential elements, but if necessary, at least one of Ti, Mg, Cu, Mn, Cr, and Zr can be added in an appropriate amount. Ti: Ti is effective in stabilizing the structure, and if it is less than 0.01%, the effect will be small, and if it exceeds 0.2%, giant compounds may occur, so it should be in the range of 0.01 to 0.2%. Mg: Mg does not deteriorate other properties, improves material strength, and has the effect of suppressing variation in selvedge ratio. However, if it is less than 0.2%, the effect is small;
If it exceeds 2.0%, giant compounds may occur, so it should be in the range of 0.2 to 2.0%. Cu: Cu has the effect of improving the anodizing treatment of pottery products, and if it is less than 0.05%, the effect is small.
If it exceeds 0.5%, the workability will be poor, so 0.05~0.5%
The range shall be . Mn, Cr, Zr: Mn, Cr, and Zr improve strength and are effective in stabilizing the structure. However, each 0.03%,
If it is less than 0.03% or 0.01%, the effect will be small, and if it is more than 0.5%, 0.4%, or 0.2%, giant compounds may occur, so Mn should be 0.03 to 0.5.
%, Cr is in the range of 0.03 to 0.4%, and Zr is in the range of 0.01 to 0.2%. It goes without saying that the amount of impurities should be kept as low as possible without impairing the effects of the present invention. Next, a method for manufacturing an aluminum alloy according to the present invention will be explained. The aluminum alloy with the above composition is melted by a conventional method, but when casting, the crystal grain size of the ingot is 3 mm.
It is necessary to do the following. Grain size is 3
If it exceeds mm, the positive side ear will become stronger, which is not preferable. Such an ingot is subjected to homogenization treatment and then hot rolled, but first the homogenization treatment must be performed twice under specific conditions. In other words, the first homogenization treatment was carried out at 500 to 600℃
2 to 24 hours, and the second time is carried out at 400 to 500°C for 2 to 24 hours. When the homogenization temperature exceeds 600℃ and 500℃ for the first and second time, respectively, the positive side ear becomes stronger.
Further, if the temperature is lower than 500°C and 400°C, respectively, the − side ear becomes strong, which is not preferable. On the other hand, the heating time is
If it is shorter than 2 hours, the effect will be small, and if it is longer than 24 hours, the effect will be saturated, so it is not preferable. In addition, hot rolling after homogenization treatment is performed at a temperature of 480 to 250℃.
It must be carried out at a temperature of Hot rolling temperature is 480℃
If it is higher than 250°C, the negative side ear will become stronger, and if it is lower than 250°C, the positive side ear will become stronger, which is not preferable. After hot rolling, cold rolling and softening treatment are performed, but cold rolling is generally applied to pure aluminum alloys for deep drawing at a final cold rolling reduction of 50 to 95% depending on the product thickness. Similar cold rolling is applied to the aluminum alloy of the above composition of the present invention,
Subjected to softening treatment. In that case, the deep-drawn selvedge after the softening treatment can be controlled within -3% to +3% even for various product plate thicknesses depending on the processing rate described above, and the variation in the selvedge ratio can be reduced. Furthermore, since deep-drawn products can generally be mass-produced with a yield in the range of -3% to +3% of the raw material, the present invention enables mass-production and reduces costs. Note that the conditions for the softening treatment are not particularly limited, and the treatment can be performed in the same manner as in the past. Next, examples of the present invention will be shown. (Example) An aluminum alloy having the chemical composition shown in Table 1 is melted by a conventional method to form an ingot with a thickness of 400 tons and a crystal grain size shown in Table 2. A sample material was manufactured. In the present invention example (condition A), the ingot was heated to 550°C.
After soaking for 24 hours, homogenization treatment was performed twice, followed by soaking at 450℃ for 24 hours, and then at 430 to 300℃.
After hot rolling to 7mmt, cold rolling was performed at a processing rate of 50 to 95% to obtain the thickness shown in Table 2, and the final thickness was 340mm.
A softening treatment was performed at ℃×2 hours. On the other hand, in the first comparative example (condition B), after the ingot was subjected to homogenization treatment at 500°C x 24 hours,
Hot rolling, cold rolling, and softening treatment were performed under the same conditions as in the examples of the present invention. In the second comparative example (condition C), after the ingot was homogenized at 500°C for 24 hours,
It was hot rolled at ~400°C to a thickness of 7 mm, followed by cold rolling and softening treatment under the same conditions as the examples of the present invention. The obtained sample material was reduced by 50% using a die with a punch diameter of 40 mm, and the 45° direction edge (+) and the 0-90° direction edge (-) were measured. The results are also listed in Table 1. As is clear from Table 2, in the examples of the present invention, the deep-drawn selvage ratio is extremely small regardless of whether the plate thickness is the same or the plate thickness is changed. On the other hand, in the case of the comparative example, even if the composition is within the range of the present invention, if either the crystal grain size of the ingot or the manufacturing conditions are outside the range of the present invention, the selvedge ratio is large, and is on the + or - side. Furthermore, even if the composition is outside the range of the present invention, if the crystal grain size and manufacturing conditions of the ingot are within the range of the present invention, the selvedge ratio is similarly large and variations occur on the + side or - side. Moreover, this tendency occurs even for sheets of the same thickness.

【table】

【table】

[Table] (Effects of the invention) As detailed above, according to the present invention, the plate thickness 1
In addition to regulating the composition of aluminum alloy soft plates for deep drawing of mm or more, we also control the grain size of the ingot and the conditions of homogenization treatment and hot rolling.
Deep drawing selvage remains -3% to +3 even when processed into various thicknesses.
% and can provide high quality aluminum material with excellent directionality. Moreover, since the selvage ratio is small, mass production is possible and costs can be reduced.

[Brief explanation of drawings]

Figure 1 shows the aluminum alloy for deep drawing.
FIG. 3 is a diagram showing the range of the present invention regarding the amount of Fe and Si.

Claims (1)

[Claims] 1% by weight (the same applies hereinafter), Fe and Si are present at each point A (Fe: 0.2%, Si: 0.6%) and B (Fe: 0.6%) shown in FIG.
0.2%, Si: 0.1%), C (Fe: 0.9%, Si: 0.8%),
Contains D (Fe: 0.4%, Si: 0.8%) in an amount within the range, with the remainder consisting of Al and unavoidable impurities, and is softened after cold rolling at a processing rate of 50 to 95%. An aluminum alloy soft plate for deep drawing with excellent directionality and a deep drawing selvage within -3% to +3%, characterized in that the plate has a thickness of 1 mm or more. 2 Fe and Si are at each point A shown in Figure 1 (Fe: 0.2%,
Si: 0.6%), B (Fe: 0.2%, Si: 0.1%), C
(Fe: 0.9%, Si: 0.8%), D (Fe: 0.4%, Si: 0.8
%), and further Ti: 0.01~
0.2%, Mg: 0.2~2.0%, Cu: 0.05~0.5%,
Mn: 0.03-0.5%, Cr: 0.03-0.4% and Zr: 0.01
~0.2%, with the remainder consisting of Al and impurities, and has a processing rate of 50
~95% cold rolled and softened plate thickness 1mm
The deep-drawn selvedge, which is characterized by being a board of -3
Aluminum alloy soft plate for deep drawing with excellent directionality within %~+3%. 3 Fe and Si are at each point A shown in Figure 1 (Fe: 0.2%,
Si: 0.6%), B (Fe: 0.2%, Si: 0.1%), C
(Fe: 0.9%, Si: 0.8%), D (Fe: 0.4%, Si: 0.8
%), with the remainder consisting of Al and impurities, for ingots with a crystal grain size of 3 mm or less, 500 to 600% x 2 to
After 24 hours of homogenization treatment, followed by two homogenization treatments of 400 to 500℃ x 2 to 24 hours, hot rolling was performed at 480 to 250℃, followed by cold rolling at a working rate of 50 to 95%. A method for producing a soft aluminum alloy plate for deep drawing with a thickness of 1 mm or more and excellent directionality, which comprises rolling and softening treatment. 4 Fe and Si are at each point A shown in Figure 1 (Fe: 0.2%,
Si: 0.6%), B (Fe: 0.2%, Si: 0.1%), C
(Fe: 0.9%, Si: 0.8%), D (Fe: 0.4%, Si: 0.8
%), and further Ti: 0.01~
0.2%, Mg: 0.2~2.0%, Cu: 0.05~0.5%,
Mn: 0.03-0.5%, Cr: 0.03-0.4% and Zr: 0.01
500 to 600 for aluminum alloys containing at least one of ~0.2% and the balance consisting of Al and impurities, and ingots with a crystal grain size of 3 mm or less
Treatment at 400-500℃ for 2-24 hours followed by 2-24 hours at ℃
After 2 homogenization treatments, 480~250
Hot rolling between ℃ and then processing rate 50~95%
1. A method for producing a soft aluminum alloy plate for deep drawing with a thickness of 1 mm or more, which has excellent directionality and is characterized by cold rolling and softening treatment.