JP3901764B2 - Method for producing aluminum alloy sheet for foil - Google Patents

Description

【００２８】
これらの箔について、光沢面および艶消し面の光沢度の均一性を以下の要領で評価した。
なお、リップルマークの有無、鋳造組織の均一性は、鋳造板について以下の要領で評価した。
評価方法は、以下の通りである。
（１）鋳造板についてのリップルマークの有無
鋳造板の表面状態を目視にて観察した。
（２）鋳造組織の均一性
鋳造板の表面および長手方向断面について、研磨後エッチングし、鋳造組織の均一性を顕微鏡で観察し、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。
（３）箔の外観の光沢度の均一性
外観を目視により観察し、光沢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２に記した。
【００２９】
【表２】

【００３０】
表１、表２から明らかなように、本発明範囲の条件で製造したアルミニウム合金鋳造板は、表面および組織欠陥がなく、またこの鋳造板から製造された箔は、外観の均一性に優れており、箔として使用可能であることが確認された。
【００３１】
【発明の効果】
以上の説明から明らかな如く、本発明によれば箔地用アルミニウム合金板を連続鋳造圧延法で製造しても、この合金板の製造に適した均一で微細な鋳造組織を有する鋳造板を得ることが出来、箔地用アルミニウム合金板としての使用を可能とするもので、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表面に離型剤を塗布し、これをワイパーで均一にする様子を示す説明図である。
【図２】双ドラムによる可動鋳型表面を回転ブラシで清浄にした後、離型剤を塗布し、これをワイパーで均一にする様子を示す説明図である。
【図３】双ベルトによる可動鋳型表面を回転ブラシで清浄にした後、離型剤を塗布し、これをワイパーで均一にする様子を示す説明図である。
【図４】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５】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
２０ 離型剤塗布装置（一例としてスプレー装置）
２１ 離型剤
３０ ワイパー装置
４０ 回転ブラシ[0001]
BACKGROUND OF THE INVENTION
The present invention is a method for producing an aluminum alloy plate for foil, and more specifically, when this alloy plate is produced by a continuous casting and rolling method, it can be used as an aluminum alloy plate for foil by improving this continuous casting condition. It relates to a manufacturing method.
[0002]
[Prior art]
In general, as a method for producing aluminum alloy sheets for foil, a slab cast from a molten aluminum alloy by a semi-continuous casting method is subjected to homogenization heat treatment and then hot-rolled and cold-rolled (annealed as necessary) or aluminum. The molten alloy is continuously supplied between the movable molds (water-cooled drums 4 and 5 shown in FIG. 4 or water-cooled belts 8 and 9 shown in FIG. 5) to form a cast plate having a thickness of 30 mm or less. It is common to carry out hot rolling (there may be annealing before, during, and after if necessary) to obtain a plate material (foil) having a desired size and performance.
The foil fabric thus manufactured is then rolled in accordance with a conventional method to obtain a foil having a thickness of about 6 to 10 μm.
[0003]
However, since the foil is required to have uniform glossiness of the appearance of the glossy surface and the matte surface, the homogeneity of the metal structure of the foil greatly affects the surface quality. That is, if the metal structure varies, the hardness of the material varies, and the distribution of oil pits formed at the time of foil rolling varies.
Further, the hardness of the material also varies on the matte surface, and the matte state varies, resulting in poor appearance.
[0004]
One of the causes for the variation in the metal structure is non-uniformity in 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 components are easily forcibly dissolved and the second phase particles are likely to be fine, there is a merit that a foil having excellent strength is generally 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, there is a problem that the solidification rate of the molten metal tends to vary, and this causes the cast structure to be non-uniform. As a typical example of the surface defect of the cast plate, there is one generally called “ripple mark” or “level line”. This is considered to occur because the cast structure periodically varies at a pitch of several mm in the longitudinal direction of the cast coil, and appears as a periodic surface defect. It may also appear as an at-random surface defect that may be due to variations in the release agent applied to the movable mold. In the present specification, these surface defects of the cast plate are collectively referred to as a ripple mark.
The part where the surface defects of the cast plate exist, the cast structure of the cast plate is also non-uniform, and the foil alloy Al foil rolled sheet and the foil that is the final product produced thereby have a non-uniform structure, Uneven appearance of gloss occurs on the surface, resulting in poor appearance. It is difficult to remove the non-uniform portion of the cast structure by chamfering as in the semi-continuous casting method, because the plate thickness is about 30 mm or less and difficult in terms of process. Since it affects the depth or the center of the plate thickness depending on the case, it is not a realistic method considering the yield.
[0007]
As described above, the continuous casting and rolling method is an attractive method in terms of production efficiency and characteristics as compared with the semi-continuous casting method, but it is difficult to remove this portion due to non-uniform cast structure and it is difficult to remove this part. Among the alloy foils, it was not possible to apply to foils that strictly required surface gloss uniformity.
[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, continuous casting and rolling of an aluminum alloy sheet for foils that can obtain a highly uniform foil on the glossy surface and the matte surface. In the production by the method, to find a casting condition for obtaining a cast plate having a uniform and fine cast structure suitable for the production of this alloy plate, and to provide a production method usable as an aluminum alloy plate for foils .
[0009]
[Means for Solving the Problems]
Invention of Claim 1 for solving the said subject is a manufacturing method by the continuous casting rolling method of the aluminum alloy board for foil, Fe is 0.2-2.8 wt%, Si is 0.05-0. Contain 3wt% of aluminum alloy molten metal with Al and inevitable impurities remaining between the movable molds and continuously cast it into a cast plate with a thickness of 30mm or less. This is cold-rolled and intermediate-annealed as necessary. Further, in the manufacturing method of final cold rolling, when continuously casting on the cast plate, first, a release agent is applied to the surface of the movable mold, and then the applied release agent is applied to the movement of the movable mold. It is characterized in that continuous casting is performed while uniformly rotating with a wiper that swings to the left or right or a roll-shaped wiper that rotates in accordance with the movement of the movable mold and swings to the left or right with respect to the movement of the movable mold .
[0010]
Further, the invention of claim 2 is a manufacturing method by a continuous casting and rolling method of an aluminum alloy sheet for foil, comprising 0.2 to 2.8 wt% Fe, 0.05 to 0.3 wt% Si, Supply the molten aluminum alloy consisting of Al and inevitable impurities between the movable molds and continuously cast it into a cast plate with a thickness of 30 mm or less. This is cold-rolled, subjected to intermediate annealing as necessary, and finally cold In the production method of rolling, when continuously casting the cast plate, first, the surface of the movable mold is cleaned with a rotating brush, and then the mold release agent is applied to the surface of the movable mold, and then the applied mold release agent is applied. Is continuously cast with a wiper that swings left and right with respect to the movement of the movable mold or a roll-shaped wiper that rotates with the movement of the movable mold and swings with respect to the movement of the movable mold. Special to do It is set to.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail below.
Among the constituent features of the present invention, the Al alloy composition will be described first.
In the present invention, an aluminum alloy containing 0.2 to 2.8 wt% of Fe and 0.05 to 0.3 wt% of Si as the alloy for foil is used, with the balance being Al and inevitable impurities.
Fe is crystallized and dispersed finely as an Al—Fe-based intermetallic compound (second phase particles) during continuous casting. The Al—Fe fine particles have an effect of improving the strength. In order to obtain these effects, the amount of Fe added is 0.2 wt% or more. However, if it exceeds 2.8 wt%, not only the effects are saturated but also the corrosion resistance is lowered. Therefore, Fe is added in the range of 0.2 to 2.8 wt%.
[0012]
Si exhibits an effect of improving strength by coexisting with Fe. In order to obtain this effect, the addition of Si needs to be 0.05 wt%. On the other hand, if the addition of Si exceeds 0.3 wt%, the amount of solid Si increases, causing hardening in the foil rolling process and increasing the number of pinholes. Therefore, Si is added in the range of 0.05 to 0.3 wt%.
[0013]
Other impurities include Cu, Mn, Mg, Zn and the like contained in ordinary aluminum ingots, but there is no particular problem when these are about 0.05 wt% or less. In addition, the inclusion of 0.1 wt% or less of Ti and B as optional additive elements is effective for refining the solidification structure during continuous casting.
[0014]
Next, manufacturing conditions after casting will be described.
In the present invention, when casting the aluminum alloy for foil, a continuous casting and rolling method is used in which the molten metal is directly cast on a cast plate having a thickness of 30 mm or less. Here, the reason why the plate thickness is 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 the second phase particles However, if the plate thickness exceeds 30 mm, a cooling rate sufficient for forced solid solution cannot be obtained and the intermetallic compound becomes coarse, which 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.
[0015]
In addition, the continuous casting in the continuous casting and rolling method which is the object here is the Hunter method using the twin drums 4 and 5 shown in FIG. 4, the 3C method, the Hazeley method using the twin belts 8 and 9 shown in FIG. However, the present invention is not limited to any particular method.
[0016]
The continuous casting of this invention is demonstrated using FIGS.
FIG. 1 is an explanatory diagram showing a state in which a release agent 21 is first applied to the surface of a movable mold by twin drums 4 and 5 by a release agent application device 20 and then uniformed by a wiper 30.
2 and 3 show that the movable mold surface by the twin belts 8 and 9 driven by the twin drums 4 and 5 and the rollers 10 to 13, respectively, is first cleaned by the rotating brush 40 and then released by the release agent coating device 20. It is explanatory drawing which shows a mode that the type | mold agent 21 is apply | coated and this is made uniform with the wiper 30 continuously.
4 and 5 are explanatory views showing an example in which the continuous cast plate 6 is manufactured by the movable mold apparatus using the twin drums 4 and 5 and the twin belts 8 and 9, respectively.
[0017]
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.
The molten metal 3 coming out of the molten metal nozzle 2 comes into contact with the mold and is cooled and solidified. However, in carrying out the present invention, the wettability between the molten metal and the mold at this time is important. I found out that it would happen.
That is, when the wettability between the molten metal and the mold is not uniform, the contact state between the molten metal and the mold is different in the partial portions, and accordingly, the solidification rate of the molten metal differs accordingly, resulting in variations in the cast structure.
[0018]
Usually, continuous casting uses movable molds that enable continuous casting such as drums, belts, and blocks as casting molds as described above, and these molds prevent seizure with aluminum or aluminum alloys. For this purpose, a release agent is applied. As the mold release agent, a solution containing carbon as a main raw material is generally used. As this coating method, a method of remotely coating a mold using a spray or the like is employed.
[0019]
However, in this method, even if the mold release agent applied to the mold is macroscopically uniform, the particles of the mold release agent that are atomized by spraying are only randomly arranged when viewed microscopically. Therefore, a part to which the release agent is attached and a part not to be attached are generated on the mold surface.
Even with such a microscopic difference in the mold surface, the wettability between the molten metal and the mold becomes non-uniform, and the cast structure fluctuates due to the aforementioned reasons.
In addition, aluminum powder, a release agent, and the like remain non-uniformly on the mold surface after casting, which also causes non-uniform wettability of the mold surface.
[0020]
Accordingly, in the present invention of claim 1, to solve this problem, the wiper 30 that is in direct contact with the movable mold is used, and the wiper 30 is swung left and right.
As shown in FIG. 1, the wiper 30 is used after a release agent 21 is applied to a mold by a release agent application device 20 such as a spray device, and is applied by swinging it left and right while contacting the mold surface. The later mold release agent 21 is uniformly extended, and a mold surface with uniform wettability can be obtained. In addition, since the wiper is in contact with the mold, the mold release agent can be extended uniformly and foreign matter adhering to the mold surface can be removed at the same time, so that a uniform mold surface can always be obtained.
In addition, although the mold release agent application apparatus 20 of FIG. 1 showed a mode that it apply | coated by spray with a spray apparatus as an example, it is not limited to this, For example, the member (For example, a space | gap contacted with the mold surface) It may be applied with a nell-like cloth impregnated with a release agent.
[0021]
As described above, swinging the wiper 30 to the left and right with respect to the movement of the mold is effective to make the wettability uniform.
The wiper may be made of heat-resistant rubber or other material that is resistant to heat and friction. However, if a material that can be impregnated with liquid, such as flannel cloth, is used, the excess release agent is removed. In addition to being able to be absorbed by the part, it is also possible to apply the release agent directly by a wiper by supplying a release agent from the outside to this part, and more uniform application than the above-mentioned spray release agent application It becomes possible.
Further, it is more preferable that the wiper is rolled and rotated together with the movement of the mold from the viewpoint of reducing the sag of the mold surface due to friction. At this time, by creating a relative speed between the movement of the mold and the rotation of the roll, it is effective to extend the mold release agent more uniformly.
[0022]
Further, in the present invention of claim 2, as shown in FIGS. 2 and 3, first, the foreign material adhering to the mold surface is removed by the rotating brush 40 to clean the mold surface, and then the release agent coating apparatus 20 (for example, The release agent 21 is applied by spraying or the like, and the applied release agent 21 is continuously cast while being uniformed by the wiper 30 having the same configuration as described above .
As described above, the adhesion of the foreign matter makes the wettability of the mold surface non-uniform as described above, but in the present invention, it is possible to achieve a uniform wettability mold surface by removing this with the rotating brush 40. .
The effect of the present invention can be obtained without any problem if the brush material is made of steel wire, stainless steel wire, nylon or the like that removes only foreign matter without scratching the mold surface.
It is to be noted that using the wiper 30 as described above simultaneously with the rotating brush 40 is a more effective method for making the wettability of the mold surface uniform and thus obtaining a uniform and fine cast structure.
[0023]
It should be noted that other casting conditions such as casting speed, mold cooling temperature and mold gap may be set in consideration of the target product size, characteristics, equipment capacity, etc., and are not defined in the present invention.
[0024]
The cast plate 6 cast as described above is rolled immediately after that, if necessary, or wound as it is on a coil. Further, it is then rolled to the desired size by cold rolling (if necessary, before, during, and after, annealing is performed one to several times) to obtain an aluminum alloy sheet for foil, and this is further rolled according to a conventional method. The foil has a thickness according to the purpose.
[0025]
When used as a foil, the aluminum alloy sheet for foil is required to have uniform appearance on the surface glossy surface and matte surface, and the homogeneity of the metal structure of the foil greatly affects the surface quality of the foil. If there is a variation in this metal structure, the glossiness and the matte surface will vary in glossiness, resulting in poor appearance.
If the above ripple mark (this part has non-uniform metal structure) occurs on the surface of the cast plate manufactured by the continuous casting and rolling method and the aluminum alloy plate for foil, the appearance of the final product foil is uniform. However, the aluminum alloy sheet and foil for foils according to the present invention produced as described above, as will be apparent from the examples described later, are uniform in appearance with the foil and are sufficient as a foil. It can be used.
[0026]
【Example】
The aluminum alloy melts having the chemical compositions shown in Table 1 were casted with thicknesses of 7 mm and 10 mm by the Hunter method using the twin drums 4 and 5 shown in FIGS. 1 and 2 as examples of the present invention, comparative examples and conventional examples, respectively. It was.
In performing these castings, the release agent application device 20 (spray device), the wiper 30 and the rotary brush 40 are combined as shown in Table 1, and the present invention example, comparative example, and conventional example are combined. did.
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 plates 6 were subjected to cold rolling and partial intermediate annealing under the conditions shown in Table 1, and further subjected to cold rolling to produce a 0.4 mm foil aluminum alloy plate.
This was further foil-rolled by a conventional method to obtain a single-side matte foil having a thickness of 15 μm.
In Table 1, an apparatus combination 1 brush, 2 spray, and 3 wiper means that the surface of the movable mold is processed in this order, and molten metal is supplied to the movable mold.
[0027]
[Table 1]

[0028]
About these foils, the uniformity of the glossiness of the glossy surface and the matte surface was evaluated in the following manner.
The presence or absence of the ripple mark and the uniformity of the cast structure were evaluated for the cast plate as follows.
The evaluation method is as follows.
(1) Presence or absence of ripple marks on the cast plate The surface state of the cast plate was visually observed.
(2) Uniformity of the cast structure The surface of the cast plate and the cross section in the longitudinal direction are etched after polishing, and the uniformity of the cast structure is observed with a microscope, and the uniformity is excellent ◎, good one ○, slightly inferior Judgment was carried out as △ which is inferior and x which is inferior.
(3) Uniformity of glossiness of the appearance of the foil The appearance is visually observed and judged as having excellent gloss uniformity ◎, good ○, slightly inferior Δ, inferior ×. went.
These test results are shown in Table 2.
[0029]
[Table 2]

[0030]
As is apparent from Tables 1 and 2, the aluminum alloy cast plate produced under the conditions of the present invention has no surface and structural defects, and the foil produced from this cast plate is excellent in appearance uniformity. It was confirmed that it can be used as a foil.
[0031]
【The invention's effect】
As is apparent from the above description, according to the present invention, a cast plate having a uniform and fine cast structure suitable for the production of this alloy plate is obtained even if the aluminum alloy plate for foil base is produced by the continuous casting and rolling method. It can be used as an aluminum alloy plate for foil, and has a remarkable industrial effect.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a state in which a mold release agent is applied to the surface of a movable mold using a twin drum and made uniform with a wiper.
FIG. 2 is an explanatory view showing a state where a movable mold surface by a twin drum is cleaned with a rotating brush, a release agent is applied, and this is made uniform with a wiper.
FIG. 3 is an explanatory view showing a state where a movable mold surface by a double belt is cleaned with a rotating brush, a release agent is applied, and this is made uniform with a wiper.
FIG. 4 is an explanatory view showing an example in which a continuous cast plate is manufactured by a movable mold apparatus (hunter method) using a twin drum.
FIG. 5 is an explanatory view showing an example in which a continuous cast plate is manufactured by a movable mold apparatus 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 20 Release agent coating device (spray device as an example)
21 Release agent 30 Wiper device 40 Rotating brush

Claims (2)

It is a manufacturing method by a continuous casting and rolling method of an aluminum alloy sheet for foil, containing 0.2 to 2.8 wt% of Fe and 0.05 to 0.3 wt% of Si, with the balance being made of Al and inevitable impurities. In the manufacturing method in which the molten aluminum alloy is supplied between the movable molds and continuously cast into a cast plate having a thickness of 30 mm or less, which is cold-rolled, intermediate-annealed as necessary, and finally cold-rolled. When continuous casting is performed, a mold release agent is first applied to the surface of the movable mold, and then the applied mold release agent is adjusted in accordance with the movement of the wiper that swings left and right with respect to the movement of the movable mold or the movement of the movable mold. A method for producing an aluminum alloy sheet for foils, characterized by performing continuous casting while uniformly rotating with a roll-shaped wiper that rotates and swings to the left and right with respect to the movement of the movable mold . It is a manufacturing method by a continuous casting and rolling method of an aluminum alloy sheet for foil, containing 0.2 to 2.8 wt% of Fe and 0.05 to 0.3 wt% of Si, with the balance being made of Al and inevitable impurities. In the manufacturing method in which the molten aluminum alloy is supplied between the movable molds and continuously cast into a cast plate having a thickness of 30 mm or less, which is cold-rolled, intermediate-annealed as necessary, and finally cold-rolled. In continuous casting, the surface of the movable mold is first cleaned with a rotating brush, and then a release agent is applied to the surface of the movable mold, and then the applied release agent is applied to the movement of the movable mold. For foil fabric, which is continuously cast while rotating uniformly with a wiper that swings to the left or right or a roll-shaped wiper that swings to the left and right with respect to the movement of the movable mold . Arminius Method of manufacturing the alloy plate.

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