JP3836532B2 - Aluminum alloy plate for building materials and equipment and manufacturing method thereof - Google Patents

Description

【００２１】
このようにして得られた板について、以下に示す処理条件で陽極酸化処理し、厚さ１５μｍの酸化皮膜を形成した。

【００２２】
このようにして得られたサンプルについて、以下の方法で外観の均一性を評価した。
〔評価方法〕
外観を目視により観察し、処理後の外観の均一性が優れているもの◎、良好なもの○、やや劣っているもの△、劣っているもの×として判定を行った。
これらの試験結果を表１に併記した。
【００２３】
表１から明らかなように、本発明の範囲の建材用アルミニウム合金板は、陽極酸化処理後の外観の均一性に優れていることが確認された。
【００２４】
（実施例２）
表２に示した器物用アルミニウム合金溶湯を本発明例、比較例及び従来例として図１に示す双ドラム４、５を用いたハンター法によりそれぞれ板厚７ｍｍおよび１０ｍｍの鋳造板６コイルとした。
なお、上記以外の鋳造条件は、実施例１と同様である。
これら鋳造板コイルを表２に示した条件で、冷間圧延および一部中間焼鈍を行い、さらに冷間圧延を施して厚さ２ｍｍとした。この圧延板に更に４００℃で１０時間の最終焼鈍を施して器物用アルミニウム合金板を製造した。
【００２５】
【表２】

【００２６】
これらの板について、深絞り加工を行って、深さ１００ｍｍ、直径２００ｍｍの鍋状とし、更に実施例１と同様の条件で陽極酸化処理を行い厚さ２０μｍの皮膜を形成した。
このようにして得られた器物の外観を実施例１と同様な基準で評価し、その結果を表２に併記した。
【００２７】
表２から明らかなように、本発明の範囲の器物用アルミニウム合金板は、陽極酸化処理後の外観の均一性に優れていることが確認された。
【００２８】
【発明の効果】
以上の説明から明らかな如く、本発明によれば、連続鋳造圧延法で製造した建材及び器物用アルミニウム合金板は、陽極酸化処理後の外観の均一性に優れており、連続鋳造圧延法のメリットを充分に生かすことができる等工業上顕著な効果を有するものである。
【図面の簡単な説明】
【図１】双ドラムによる可動鋳型装置（ハンター法）で連続鋳造板を製造する一例を示す説明図である。
【図２】双ベルトによる可動鋳型装置（ヘズレー法）で連続鋳造板を製造する一例を示す説明図である。
【符号の説明】
１ 湯溜まり（ヘッドボックス）
２ 鋳造ノズル
３ 溶湯
４、５ ドラム（可動鋳型）
６ 鋳造板
８、９ ベルト（可動鋳型）
１０〜１３ ローラ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aluminum alloy plate for building materials and equipment and a method for producing the same. More specifically, the aluminum alloy plate is produced by a continuous casting and rolling method, and the uniformity of the appearance after anodizing treatment is improved by improving the Al alloy composition. The present invention relates to an improved aluminum alloy plate for building materials and equipment and a method for producing the same.
[0002]
[Prior art]
In general, as a manufacturing method of aluminum alloy sheets for building materials and equipment, a slab cast from a predetermined molten aluminum alloy by a semi-continuous casting method is subjected to a homogenization heat treatment, followed by hot rolling and cold rolling (annealing as necessary). Smelt or molten aluminum alloy is continuously supplied between the movable molds (water-cooled drums 4 and 5 shown in FIG. 1 or water-cooled belts 8 and 9 shown in FIG. 2) to form a cast plate having a thickness of 30 mm or less. This is cold-rolled (may be annealed before, during, and after if necessary) to obtain a plate material of a predetermined size (for example, a plate thickness of 1 to 3 mm), and in the case of building materials, anticorrosion and surface hardening. For the purpose of coloring, etc., anodizing treatment (film thickness of about 20 μm) is applied. In the case of containers, products are processed by molding (deep drawing, overhanging, etc.), and further anodized (film thickness of about 20 μm) It is one Is a basis.
[0003]
However, since the aluminum alloy plate for building materials and equipment is made into a plate by the above process and finally subjected to anodizing treatment as described above, the uniformity of the metal structure of the plate greatly affects the surface quality. That is, if there is variation in the metal structure, the appearance after the anodizing treatment becomes non-uniform in a strip shape or spots, resulting in poor appearance.
[0004]
One of the causes of the variation of the metal structure is non-uniformity of the cast structure.
For example, the cast structure of a slab cast by the semi-continuous casting method generally changes the structure of the chill layer, coarse cell layer, and fine cell layer as it moves from the casting surface to the inside. Here, the combined portion of the chill layer and the coarse cell layer is generally called a picture frame and becomes an unstable metal structure, which adversely affects the surface quality. Therefore, it is generally shaved off by chamfering.
In the production of an aluminum alloy plate by this method, the slab chamfered in this way is subjected to homogenization heat treatment and hot rolling, followed by cold rolling (annealing if necessary) to obtain a predetermined plate.
[0005]
In addition, the continuous casting and rolling method eliminates the ingot homogenization heat treatment and hot rolling steps, and is a very effective method for improving the yield and energy efficiency, and can increase the cooling rate of the molten metal. Since the alloy component is easily forcibly dissolved and the second phase particles are likely to be fine, there is generally an advantage that an aluminum alloy plate excellent in impact resistance, formability and fatigue strength can be obtained.
[0006]
However, in this continuous casting and rolling method, since the mold moves continuously with respect to the molten metal supplied from the basic principle of production, the contact between the molten metal and the movable mold during casting is unstable. For this reason, the cooling rate of the molten metal is likely to vary, which causes a problem that the cast structure of the cast plate becomes non-uniform.
An aluminum alloy rolled sheet produced with such a cast sheet having a non-uniform cast structure has a non-uniform appearance after anodizing and becomes defective.
It is difficult to remove a non-uniform portion of a cast structure of a cast plate produced by the continuous casting and rolling method by chamfering as in the semi-continuous casting method, because the plate thickness is about 30 mm or less and the process is difficult. Usually, this structural variation affects the depth of several millimeters or, depending on the case, to the central portion of the plate thickness even inside the plate thickness, which is not a practical method in view of the yield.
[0007]
As described above, the continuous casting rolling method is an attractive method in terms of production efficiency and characteristics as compared to the semi-continuous casting method, but non-uniformity occurs in the cast structure and it is difficult to remove this part. Finally, anodization treatment was performed, and it was not possible to apply to an aluminum alloy plate for building materials and equipment for which the uniformity of the appearance after the treatment was strictly required.
[0008]
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned problems of the prior art. Specifically, it is an Al alloy plate manufactured by a continuous casting and rolling method, improving the uniformity of the appearance after anodizing treatment, and providing an aminium alloy plate for building materials and equipment excellent in this property and a method for manufacturing the same. That is.
[0009]
[Means for Solving the Problems]
The invention of claim 1 for solving the above-mentioned problem is an aluminum alloy plate formed by a continuous casting and rolling method, and the alloy composition thereof is Fe 0.8 wt% or less, Si 1.0 wt% or less, Cu 0.2 wt% or less, and Be0 An aluminum alloy sheet for building materials and equipment containing one or two of .0002 to 0.01 wt% and Sn 0.001 to 0.10 wt%, the balance being Al and inevitable impurities .
[0010]
The invention of claim 2 is a method for producing an aluminum alloy sheet by a continuous casting and rolling method, Fe 0.8 wt% or less, Si 1.0 wt% or less, Cu 0.2 wt% or less, and Be 0.0002 to 0.01 wt%. , Containing one or two of Sn 0.001 to 0.10 wt%, the balance being Al and inevitable impurities, supplying molten aluminum alloy between the movable molds and continuously casting into a cast plate having a thickness of 30 mm or less This is a method for producing an aluminum alloy plate for building materials and equipment , which is cold-rolled and further cold-rolled.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail below.
The invention of claim 1 is an aluminum alloy plate for building materials and equipment having excellent uniformity after anodizing treatment, which is made of a predetermined alloy composition manufactured by a continuous casting and rolling method.
The composition of the building material and the aluminum alloy for equipment in the present invention will be described below.
Fe is made into the range below 0.8 wt%. Fe has the effect of homogenizing the anodized surface. Fe is an element that combines with other elements in the aluminum alloy to form Al—Fe and Al—Fe—Si intermetallic compounds. Among these intermetallic compounds, 1-20 μm intermetallic compounds are In addition to the effect of crystal grain refinement, it has the effect of forming a uniform and fine anodized surface. However, when the content exceeds 0.8 wt%, the anodized surface becomes non-uniform due to the formation of a coarse compound exceeding 20 μm.
[0012]
Moreover, Si is taken as 1.0 wt% or less. Preferably it is 0.5 wt% or less, more preferably 0.2 wt% or less. Si is usually contained as an impurity, and if it exceeds 1.0 wt%, defects tend to appear with microscopically insufficiently dull spots on the anodized surface, which is not preferable.
Cu is set to a range of 0.2 wt% or less. This is because when Cu exceeds 0.2 wt%, the corrosion resistance decreases.
[0013]
Be is 0.0002 to 0.01 wt%. Be is an element that is not usually contained in the aluminum ingot, but as a result of repeated research by the present inventors, it has an action of suppressing surface oxidation in the aluminum alloy molten metal, and is applied to the casting nozzle during continuous casting. There is an effect of preventing adhesion of oxides, eliminating disturbance in the width direction of the melt, and stabilizing the contact between the melt and the mold during casting. The reason why the range of Be is described above is that when the amount is less than 0.0002 wt%, the above effect cannot be obtained, and when it exceeds 0.01 wt%, the effect is saturated and wasted.
[0014]
Sn is 0.001 to 0.10 wt%. Sn is usually an element that is not contained in the aluminum ingot, but as a result of repeated research by the present inventors, in addition to the same effect as Be, adhesion between the molten aluminum alloy and the mold during continuous casting is achieved. There is a lubricating action to prevent.
In general, in the case of continuous casting, when the molten aluminum alloy comes into contact with the mold and solidifies, the molten metal and the continuously moving mold may be fixed. This fixed part changes the cooling rate and destroys the aluminum coating layer on the mold surface, so that the cast structure in the vicinity of the surface becomes discontinuous, and defects such as stripes occur on the coil surface. The addition of Sn has the effect of preventing this sticking phenomenon and stabilizing the contact between the molten metal and the mold during casting.
This prevention of sticking is less effective if Sn is less than 0.001 wt%, and if it exceeds 0.10 wt%, the effect is saturated and wasted. Therefore, Sn is set to the above range.
In addition, although the said effect is acquired even if one of Be and Sn is added, it is more preferable to add both.
[0015]
As other impurities, there are Mn, Mg, Cr, Ni, V, Zn and the like contained in a normal aluminum metal, but there is no particular problem when these are less than 0.05 wt%. Further, the inclusion of 0.1 wt% or less of each of Ti and B as optional additive elements is effective for refining the solidified structure during casting, as in DC casting.
The building material and the aluminum alloy sheet for equipment having the above-described configuration can obtain a uniform surface by anodizing treatment.
[0016]
The invention of claim 2 relates to a specific manufacturing method for manufacturing the building material and the aluminum alloy sheet for equipment by a continuous casting and rolling method.
That is, aluminum for building materials and equipment characterized by supplying molten aluminum alloy of the above composition between movable molds and continuously casting it into a cast plate having a thickness of 30 mm or less, cold rolling this, and finally cold rolling. It is a manufacturing method of an alloy plate.
Here, the reason for continuous casting on a cast plate having a thickness of 30 mm or less is that, as described above, in the continuous casting and rolling method, the cooling rate of the molten metal can be increased, so that the alloy components are easily forcibly dissolved, and Since the second phase particles tend to be fine, various merits are obtained as material characteristics. However, if the plate thickness exceeds 30 mm, a sufficient cooling rate for forced solid solution cannot be obtained, and the intermetallic compound becomes coarse. Therefore, it is not preferable. On the other hand, if the plate thickness is too thick, the number of rolling operations in the lower process increases, which is not economical. Accordingly, the thinner the plate thickness, the better. However, it is preferably 15 mm or less, more preferably 10 mm or less.
[0017]
In addition, the continuous casting in the continuous casting and rolling method that is the subject here includes the Hunter method using a twin drum, the 3C method, the Hazeley method using a twin belt, and the like. It is not limited at all.
FIGS. 1 and 2 show an example of continuous casting in the present invention, and are explanatory views showing how the continuous cast plate 6 is manufactured by a movable mold apparatus using twin drums 4 and 5 and twin belts 8 and 9, respectively. It is.
First, molten aluminum alloy 3 adjusted to a desired alloy composition is temporarily stored in a hot water pool (usually called a head box) 1 through a trough from a melting and holding furnace (not shown), and then water-cooled through a casting nozzle 2. Is guided to the movable mold (drums 4, 5, belts 8, 9). Reference numeral 6 denotes a cast plate.
[0018]
The cast plate 6 cast as described above is rolled immediately after that, if necessary, or wound as it is on a coil. After that, it is rolled to the desired size by cold rolling (annealing one to several times before, during, and after if necessary) to obtain aluminum alloy sheets for building materials and equipment, and the building materials are further anodized After processing, the container is subjected to forming processing (deep drawing, overhang processing, etc.), and then subjected to further anodizing treatment to obtain a final product.
In the above rolling, the cold rolling rate and annealing conditions are not particularly specified, and arbitrary conditions are possible.
As described above, the aluminum alloy plate for building materials and equipment manufactured by the method of the present invention can obtain a uniform appearance surface by the final anodic oxidation treatment, as will be apparent from the examples described later.
[0019]
【Example】
Example 1
The molten aluminum alloy for building materials shown in Table 1 was made into 6 coils of cast plates having a plate thickness of 7 mm and 10 mm, respectively, by the Hunter method using the twin drums 4 and 5 shown in FIG. 1 as examples of the present invention, comparative examples and conventional examples.
The casting conditions other than the above are as follows.
-Mold release agent: Solution in which fine carbon is dissolved in water-Cast plate width: 1300 mm
-Molten metal temperature: 700 ° C
Casting speed: 1000 mm / min.
Cooling rate: 300 to 700 ° C./sec.
These cast plate coils were cold-rolled by a conventional method, subjected to intermediate annealing under the conditions shown in Table 1, and further cold-rolled to produce a 2 mm thick aluminum alloy plate for building materials.
[0020]
[Table 1]

[0021]
The plate thus obtained was anodized under the following processing conditions to form an oxide film having a thickness of 15 μm.

[0022]
The samples thus obtained were evaluated for appearance uniformity by the following method.
〔Evaluation methods〕
The appearance was visually observed, and the judgment was made as ◎ excellent in uniformity of the appearance after treatment, good ◯, slightly inferior Δ, inferior ×.
These test results are also shown in Table 1.
[0023]
As is clear from Table 1, it was confirmed that the aluminum alloy sheet for building materials within the scope of the present invention was excellent in the uniformity of the appearance after the anodizing treatment.
[0024]
(Example 2)
The molten aluminum alloy for equipment shown in Table 2 was made into 6 coils of cast plates having a plate thickness of 7 mm and 10 mm, respectively, by the Hunter method using the twin drums 4 and 5 shown in FIG. 1 as examples of the present invention, comparative examples and conventional examples.
The casting conditions other than the above are the same as in Example 1.
These cast plate coils were cold-rolled and partially annealed under the conditions shown in Table 2, and further cold-rolled to a thickness of 2 mm. The rolled plate was further subjected to final annealing at 400 ° C. for 10 hours to produce an aluminum alloy plate for equipment.
[0025]
[Table 2]

[0026]
These plates were deep-drawn into a pan shape having a depth of 100 mm and a diameter of 200 mm, and further anodized under the same conditions as in Example 1 to form a film having a thickness of 20 μm.
The appearance of the container thus obtained was evaluated according to the same criteria as in Example 1, and the results are also shown in Table 2.
[0027]
As apparent from Table 2, it was confirmed that the aluminum alloy sheet for equipment within the scope of the present invention was excellent in the uniformity of the appearance after the anodizing treatment.
[0028]
【The invention's effect】
As is clear from the above description, according to the present invention, the aluminum alloy sheet for building materials and equipment manufactured by the continuous casting and rolling method is excellent in the uniformity of the appearance after the anodizing treatment, and the merit of the continuous casting and rolling method. It has a significant industrial effect, such as being able to make full use of.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of manufacturing a continuous cast plate by a movable mold apparatus (hunter method) using a twin drum.
FIG. 2 is an explanatory view showing an example in which a continuous cast plate is manufactured by a movable mold device using a double belt (Hezley method).
[Explanation of symbols]
1 Hot water pool (head box)
2 Casting nozzle 3 Molten metal 4, 5 Drum (movable mold)
6 Casting plates 8, 9 Belt (movable mold)
10-13 Roller

Claims (2)

An aluminum alloy sheet obtained by a continuous casting and rolling method, the alloy composition of which is Fe 0.8 wt% or less, Si 1.0 wt% or less, Cu 0.2 wt% or less, Be 0.0002 to 0.01 wt%, Sn 0.001 to 0. An aluminum alloy plate for building materials and equipment , containing 10 wt% of one or two kinds, the balance being made of Al and inevitable impurities. It is a manufacturing method by continuous casting and rolling of an aluminum alloy plate, Fe 0.8 wt% or less, Si 1.0 wt% or less, Cu 0.2 wt% or less, Be0.0002 to 0.01 wt%, Sn 0.001 to 0.10 wt% 1 or 2 of the following, and the balance is Al and unavoidable impurities are supplied between the movable mold and molten aluminum alloy is continuously cast into a cast plate having a thickness of 30 mm or less, which is cold-rolled, A method for producing an aminium alloy plate for building materials and equipment, characterized by subjecting to final cold rolling .

Images