JP4079484B2

JP4079484B2 - Lubricating medium application method and apparatus for forming aluminum alloy plate

Info

Publication number: JP4079484B2
Application number: JP29172397A
Authority: JP
Inventors: 秀俊内田; 努古山; 勉森山
Original assignee: Sumitomo Light Metal Industries Ltd
Current assignee: Sumitomo Light Metal Industries Ltd
Priority date: 1997-10-08
Filing date: 1997-10-08
Publication date: 2008-04-23
Anticipated expiration: 2017-10-08
Also published as: JPH11114493A

Description

【０００１】
【発明の属する技術分野】
本発明は、成形加工用アルミニウム合金板の潤滑媒体塗布方法および装置、とくに、自動車外板など輸送機器材料として使用されるＡｌ−Ｍｇ−Ｓｉ系合金板に潤滑媒体を塗布する方法および最終熱処理された該アルミニウム合金板に潤滑媒体を塗布する装置の改良に関する。
【０００２】
【従来の技術】
自動車外板をはじめとする輸送機器用材料として、従来、各種のアルミニウム合金が開発されている。このうち、自動車外板材としては、多くのＡｌ−Ｍｇ系合金、Ａｌ−Ｍｇ−Ｓｉ系合金が提案され、一部実用化されている。
【０００３】
自動車外板材に要求される性能としては、▲１▼成形性に優れていること、▲２▼成形加工後の表面外観に優れていること、▲３▼プレス加工時にプレス型の形状が正確に出ること、すなわち形状凍結性に優れていること、▲４▼高強度を有すること、▲５▼耐デント性をそなえていること、▲６▼耐食性を有することなどが挙げられるが、アルミニウム合金板は、自動車外板として長年使用されている鋼板に比べ、とくに成形性が劣り、この点についての改善が望まれている。
【０００４】
自動車外板材の製造において、Ａｌ−Ｍｇ系合金板、Ａｌ−Ｍｇ−Ｓｉ系合金板などの成形加工用アルミニウム合金板は、表面に潤滑油などの各種の潤滑媒体を塗布されるが、発明者らは、この場合における潤滑媒体の塗布条件と成形性との関連性について検討していく過程において、板表面に塗布された潤滑媒体のレベリングが、成形性に効果を有することを見出し本発明に至った。
【０００５】
【発明が解決しようとする課題】
本発明は、上記の知見に基づいてなされたものであり、その目的は、とくに自動車外板など輸送機器用の成形加工用アルミニウム合金板に潤滑媒体を塗布する場合における潤滑媒体の塗布条件を改良して、さらに優れた成形性を与えるための成形加工用アルミニウム合金板の潤滑媒体塗布方法および装置を提供することにある。
【０００６】
【課題を解決するための手段】
上記の目的を達成するための本発明による成形加工用アルミニウム合金板の潤滑媒体塗布方法は、成形加工用Ａｌ−Ｍｇ−Ｓｉ系合金板の表面に、潤滑媒体を塗布した後、３０〜１００℃の温度で塗布された潤滑媒体のレベリング処理を行うことを特徴とする。
【０００７】
また、成形加工用Ａｌ−Ｍｇ−Ｓｉ系合金板の表面に、粘度が１〜２０ｃＳｔの潤滑媒体を塗布した後、３０〜８０℃の温度で塗布された潤滑媒体のレベリング処理を行うことを第２の特徴とし、成形加工用Ａｌ−Ｍｇ−Ｓｉ系合金板の表面に、粘度が２０〜１００ｃＳｔの潤滑媒体を塗布した後、５０〜１００℃の温度で塗布された潤滑媒体のレベリング処理を行うことを第３の特徴とする。
【０００９】
さらに、潤滑媒体の塗布およびレベリング処理が、成形加工用Ａｌ−Ｍｇ−Ｓｉ系合金板の最終熱処理後に行われることを第４の特徴とする。
【００１０】
本発明による成形加工用アルミニウム合金板の潤滑媒体塗布装置は、請求項１または２記載の成形加工用アルミニウム合金板の潤滑媒体塗布方法を実施するための装置であって、最終熱処理を施すための加熱装置と冷却装置とを有する連続焼鈍炉、連続焼鈍炉の後段に配置された巻取り装置または切断装置を備え、冷却装置と巻取り装置または冷却装置と切断装置の間に、潤滑媒体塗布装置および潤滑媒体のレベリング装置を介設してなり、最終熱処理された成形加工用Ａｌ−Ｍｇ−Ｓｉ系合金板の表面に潤滑媒体が塗布され、塗布された潤滑媒体が３０〜１００℃の温度でレベリング処理された後、巻取られまたは切断されるようにしたことを構成上の特徴とする。
【００１１】
【発明の実施の形態】
本発明において、成形加工用アルミニウム合金としては、Ａｌ−Ｍｇ−Ｓｉ系合金（６０００系合金）が対象となるが、本発明はとくに、Ｍｇ：０．３〜１．５％（質量％、以下同じ）、Ｓｉ：０．３〜１．５％を含有し、またはさらに１％以下のＣｕ、Ｍｎ、０．５％以下のＣｒ、Ｖ、Ｆｅ、０．１％以下のＴｉ、Ｂのうちの１種または２種以上を含有し、残部Ａｌおよび不純物からなるＡｌ−Ｍｇ−Ｓｉ系合金に対して好適に適用される。以下、成形加工用アルミニウム合金とは、成形加工用Ａｌ−Ｍｇ−Ｓｉ系合金をいう。
【００１２】
本発明は、上記の成形加工用アルミニウム合金板の表面に、潤滑油などの潤滑媒体を塗布した後、所定の温度で塗布された潤滑媒体のレベリング処理を行うことを特徴とする。潤滑媒体の塗布およびレベリング処理は、成形加工用アルミニウム合金板の製造工程において、最終熱処理の後に行うのが好ましい。
【００１３】
通常、成形加工用アルミニウム合金板の最終熱処理は連続焼鈍炉で行われるので、潤滑媒体塗布装置およびレベリング装置を、連続焼鈍炉と連続焼鈍炉の後段に位置する巻取り装置または切断装置からなる処理ライン内に組み込むのが製造工程上効率的である。具体的には、図１に示すように、潤滑媒体塗布装置５およびレベリング装置６を、加熱装置２と冷却装置３を備えた連続焼鈍炉１の冷却装置３と巻取り装置４との間に配置する。７は出側アキュムレータである。連続焼鈍炉の後段に切断装置が配設される場合には、冷却装置と切断装置のシヤーおよびパイリング装置との間にこれらの装置を配置するのが望ましい。
【００１４】
本発明の態様は、成形加工用アルミニウム合金板の表面に、潤滑油などの潤滑媒体を塗布した後、３０〜１００℃の温度で塗布された潤滑媒体のレベリング処理を行うことにある。レベリング処理温度が３０℃未満では成形性向上の効果が十分でなく、１００℃を越える温度で処理すると、潤滑媒体の揮発量が多くなって塗布量が不均一となり易く、また、Ａｌ−Ｍｇ−Ｓｉ系合金板において、時効硬化が進行するおそれがあり好ましくない。
【００１５】
レベリング処理時間については、とくに限定はなく、潤滑媒体の種類などに応じて種々の処理時間をとることができる。一時的に所定の温度域に達することにより効果が得られる。潤滑媒体の劣化がなければ、長時間のレベリング処理を行っても問題はない。
【００１６】
最も好ましいレベリング処理条件は、潤滑媒体の粘度および種類によって異なる。本発明の第２の態様は、成形加工用アルミニウム合金板の表面に、粘度が１〜２０ｃＳｔの潤滑媒体を塗布した後、３０〜８０℃の温度で塗布された潤滑媒体のレベリング処理を行うことにある。第３の態様として、粘度が２０〜１００ｃＳｔの流動性の低い潤滑媒体を塗布した場合には、５０〜１００℃の高温で塗布された潤滑媒体のレベリング処理を行うことが好ましい。
【００１８】
なお、成形用アルミニウム合金板において、軟化、溶体化処理などの最終熱処理は、４５０℃以上の温度で行われることが多いため、熱処理時、アルミニウム合金板の表面に酸化皮膜が生成する。この酸化皮膜は表面処理性や接着性を悪影響を及ぼすことが少なくなく、これが潤滑媒体の塗布を害すると判断される場合には、酸やアルカリにより酸化皮膜を除去した後、潤滑媒体の塗布、レベリング処理を行っても同様の効果を達成することができる。
【００１９】
【実施例】
以下、本発明の実施例を比較例と対比して説明する。
実施例１、比較例１
Ｍｇ:4.5％、Ｓｉ:0.3％、Ｃｕ:0.3％、Ｍｎ:0.2％を含有し、残部Ａｌおよび不純物からなるＡｌ−Ｍｇ系合金の鋳塊を、常法に従って均質化処理した後、厚さ０．４ｍｍまで熱間圧延し、さらに１ｍｍ厚さまで冷間圧延を行った。ついで、冷間圧延板について５５０℃の温度で２０秒間保持する熱処理を行い、室温まで急冷した。
【００２０】
得られたアルミニウム合金板に、粘度３ｃＳｔの潤滑油Ａを５００ｍｇ／ｍ²、粘度７０ｃＳｔの潤滑油Ｂを１ｇ／ｍ²の割合で塗布し、表１に示す条件でレベリング処理を行った後、直径１００ｍｍ球頭張出試験を実施した。結果を表１に示す。
【００２１】
【表１】

【００２２】
表１に示すように、本発明に従う試験材Ｎｏ．１、２は優れた張出成形高さを示したが、試験材Ｎｏ．４、５は、潤滑油塗布後、レベリング処理を行わなかったため、張出成形性が劣っている。
【００２３】
実施例２
Ｍｇ:0.5％、Ｓｉ:1.2％を含有し、残部Ａｌおよび不純物からなるＡｌ−Ｍｇ−Ｓｉ系合金の鋳塊を、常法に従って均質化処理した後、厚さ０．４ｍｍまで熱間圧延し、さらに１ｍｍ厚さまで冷間圧延を行った。ついで、冷間圧延板について５５０℃の温度で２０秒間保持する熱処理を行い、室温まで急冷した。
【００２４】
得られたアルミニウム合金板に、粘度３ｃＳｔの潤滑油Ａを５００ｍｇ／ｍ²、粘度７０ｃＳｔの潤滑油Ｂを１ｇ／ｍ²、ワックス系の潤滑油Ｃを２ｍｇ／ｍ²の割合で塗布し、表２に示す条件でレベリング処理を行った後、直径１００ｍｍ球頭張出試験を実施した。結果を表２に示す。表２にみられるように、本発明に従う試験材Ｎｏ．５〜１１はいずれも、優れた張出成形性をそなえており、潤滑媒体の粘度、種類に対応したレベリング処理を行った試験材Ｎｏ．５〜６、９、１１はとくに良好な張出成形高さを示した。
【００２５】
【表２】

【００２６】
比較例２
実施例２と同様、Ｍｇ:0.5％、Ｓｉ:1.2％を含有し、残部Ａｌおよび不純物からなるＡｌ−Ｍｇ−Ｓｉ系合金の鋳塊を、常法に従って均質化処理した後、厚さ０．４ｍｍまで熱間圧延し、さらに１ｍｍ厚さまで冷間圧延を行った。ついで、冷間圧延板について５５０℃の温度で２０秒間保持する熱処理を行い、室温まで急冷した。
【００２７】
得られたアルミニウム合金板に、実施例２と同じく、粘度３ｃＳｔの潤滑油Ａを５００ｍｇ／ｍ²、粘度７０ｃＳｔの潤滑油Ｂを１ｇ／ｍ²、ワックス系の潤滑油Ｃを２ｍｇ／ｍ²の割合で塗布し、表３に示す条件でレベリング処理を行った後、直径１００ｍｍ球頭張出試験を実施した。結果を表３に示す。
【００２８】
【表３】

【００２９】
表３に示すように、試験材Ｎｏ．１２、１４、１５は、潤滑油塗布後にレベリング処理を行わなかったため張出成形性が劣る。試験材Ｎｏ．１３は、レベリング処理温度が高過ぎるため、時効硬化が進行し、成形性が低下している。
【００３０】
【発明の効果】
本発明によれば、潤滑油などの潤滑媒体を塗布された成形加工用アルミニウム合金板の成形性がより向上し、自動車外板用として十分な成形性をそなえた板材を得ることが可能となる。
【図面の簡単な説明】
【図１】本発明に係る潤滑媒体塗布装置およびレベリング処理装置を組込んだ連続焼鈍ラインの概略を示す図である。
【符号の説明】
１連続焼鈍炉
２加熱装置
３冷却装置
４巻取り装置
５潤滑媒体塗布装置
６レベリング処理装置
７アキュムレータ
Ｓアルミニウム合金板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for applying a lubricating medium to an aluminum alloy plate for forming, particularly a method for applying a lubricating medium to an Al-Mg-Si based alloy plate used as a transport equipment material such as an automobile outer plate and a final heat treatment. The present invention also relates to an improvement in an apparatus for applying a lubricating medium to the aluminum alloy plate.
[0002]
[Prior art]
Conventionally, various aluminum alloys have been developed as materials for transportation equipment including automobile outer plates. Among these, as an automobile outer plate material, many Al—Mg alloys and Al—Mg—Si alloys have been proposed and partially put into practical use.
[0003]
The performance required for automotive outer plate materials is as follows: (1) excellent formability, (2) excellent surface appearance after forming, and (3) the shape of the press die is accurate during pressing. Aluminum alloy sheet, that is, excellent in shape freezing property, (4) having high strength, (5) having dent resistance, (6) having corrosion resistance, etc. Compared with steel plates that have been used for many years as automobile outer plates, formability is particularly inferior, and improvements in this respect are desired.
[0004]
In the production of automotive outer plate materials, aluminum alloy sheets for forming such as Al—Mg alloy plates and Al—Mg—Si alloy plates are coated with various lubricating media such as lubricating oil on the surface. Found that the leveling of the lubricating medium applied to the plate surface has an effect on the formability in the process of examining the relationship between the application conditions of the lubricating medium and the formability in this case. It came.
[0005]
[Problems to be solved by the invention]
The present invention has been made on the basis of the above knowledge, and its object is to improve the application conditions of the lubricating medium particularly when the lubricating medium is applied to an aluminum alloy plate for molding for transportation equipment such as an automobile outer plate. An object of the present invention is to provide a lubricating medium coating method and apparatus for forming aluminum alloy plates for providing better formability.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the lubricating medium coating method of the aluminum alloy plate for forming according to the present invention is performed at 30 to 100 ° C. after applying the lubricating medium to the surface of the Al—Mg—Si based alloy plate for forming. and performing a leveling process at temperatures coated lubricating medium.
[0007]
In addition, after applying a lubricating medium having a viscosity of 1 to 20 cSt on the surface of the Al—Mg—Si based alloy plate for forming, the leveling treatment of the lubricating medium applied at a temperature of 30 to 80 ° C. is performed. According to the second feature, a lubricating medium having a viscosity of 20 to 100 cSt is applied to the surface of the Al-Mg-Si alloy plate for forming, and then the lubricating medium applied at a temperature of 50 to 100 ° C is subjected to a leveling process. This is the third feature.
[0009]
Furthermore , the fourth feature is that the lubricating medium is applied and leveled after the final heat treatment of the Al—Mg—Si alloy plate for forming .
[0010]
An apparatus for applying a lubricating medium for forming aluminum alloy sheets according to the present invention is an apparatus for carrying out the method for applying a lubricating medium for forming aluminum alloy sheets according to

claim

1 or 2 for applying a final heat treatment. A continuous annealing furnace having a heating device and a cooling device, a winding device or a cutting device arranged at a subsequent stage of the continuous annealing furnace, and a lubricating medium coating device between the cooling device and the winding device or between the cooling device and the cutting device The lubricating medium is applied to the surface of the final heat-treated Al-Mg-Si alloy plate, and the applied lubricating medium is at a temperature of 30 to 100 ° C. It is a structural feature that the film is wound or cut after being leveled.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the aluminum alloy for forming is an Al—Mg—Si based alloy (6000 based alloy). In particular, the present invention is Mg: 0.3 to 1.5% (mass%, below) The same), Si: 0.3 to 1.5%, or further 1% or less of Cu, Mn, 0.5% or less of Cr, V, Fe, 0.1% or less of Ti, B It is suitably applied to an Al—Mg—Si alloy containing one or more of the above, and the balance Al and impurities. Hereinafter, the aluminum alloy for forming means an Al—Mg—Si based alloy for forming.
[0012]
The present invention is characterized in that after a lubricating medium such as lubricating oil is applied to the surface of the above-described aluminum alloy plate for forming, a leveling process is performed on the applied lubricating medium at a predetermined temperature. The lubrication medium application and leveling treatment are preferably performed after the final heat treatment in the manufacturing process of the aluminum alloy sheet for forming.
[0013]
Usually, the final heat treatment of the aluminum alloy sheet for forming is performed in a continuous annealing furnace. Therefore, the lubricating medium coating device and the leveling device are processed by a winding device or a cutting device located at the subsequent stage of the continuous annealing furnace and the continuous annealing furnace. Incorporation in the line is efficient in the manufacturing process. Specifically, as shown in FIG. 1, the lubricating medium coating device 5 and the leveling device 6 are arranged between the cooling device 3 and the winding device 4 of the continuous annealing furnace 1 provided with the heating device 2 and the cooling device 3. Deploy. Reference numeral 7 denotes an output side accumulator. In the case where a cutting device is disposed in the subsequent stage of the continuous annealing furnace, it is desirable to dispose these devices between the cooling device and the shear and the pyring device of the cutting device.
[0014]
An aspect of the present invention is to perform a leveling treatment of a lubricating medium applied at a temperature of 30 to 100 ° C. after applying a lubricating medium such as lubricating oil to the surface of the aluminum alloy plate for forming. If the leveling treatment temperature is less than 30 ° C., the effect of improving the moldability is not sufficient, and if the treatment is performed at a temperature exceeding 100 ° C., the amount of volatilization of the lubricating medium increases and the coating amount tends to become non-uniform, and Al—Mg— In Si-based alloy plates, age hardening may proceed, which is not preferable.
[0015]
The leveling treatment time is not particularly limited, and various treatment times can be taken depending on the type of the lubricating medium. The effect is obtained by temporarily reaching a predetermined temperature range. If there is no deterioration of the lubricating medium, there is no problem even if the leveling process is performed for a long time.
[0016]
The most preferred leveling conditions vary depending on the viscosity and type of lubricating medium. In the second aspect of the present invention, after applying a lubricating medium having a viscosity of 1 to 20 cSt to the surface of the aluminum alloy plate for forming, the lubricating medium applied at a temperature of 30 to 80 ° C. is leveled. It is in. As a third aspect, when a low fluidity lubricating medium having a viscosity of 20 to 100 cSt is applied, the lubricating medium applied at a high temperature of 50 to 100 ° C. is preferably subjected to a leveling process.
[0018]
In addition, in the aluminum alloy plate for shaping | molding, since final heat processing, such as a softening and solution treatment, is often performed at the temperature of 450 degreeC or more, an oxide film produces | generates on the surface of an aluminum alloy plate at the time of heat processing. This oxide film often has an adverse effect on the surface treatment properties and adhesion, and when it is judged that this damages the application of the lubricating medium, after removing the oxide film with an acid or alkali, The same effect can be achieved even if the leveling process is performed.
[0019]
【Example】
Examples of the present invention will be described below in comparison with comparative examples.
Example 1 and Comparative Example 1
An ingot of an Al-Mg alloy containing Mg: 4.5%, Si: 0.3%, Cu: 0.3%, Mn: 0.2%, and remaining Al and impurities is homogenized according to a conventional method, and then the thickness is increased. Hot-rolled to 0.4 mm and further cold-rolled to a thickness of 1 mm. Subsequently, the cold-rolled sheet was heat-treated at a temperature of 550 ° C. for 20 seconds and rapidly cooled to room temperature.
[0020]
After the lubricating oil A having a viscosity of 3 cSt was applied to the obtained aluminum alloy plate at a ratio of 500 mg / m ² and the lubricating oil B having a viscosity of 70 cSt at a rate of 1 g / m ² , the leveling treatment was performed under the conditions shown in Table 1. A 100 mm diameter ball overhang test was performed. The results are shown in Table 1.
[0021]
[Table 1]

[0022]
As shown in Table 1, the test material No. Nos. 1 and 2 showed excellent overhang forming height. Nos. 4 and 5 were inferior in stretch formability because no leveling treatment was performed after the lubricant was applied.
[0023]
Example 2
An ingot of Al-Mg-Si alloy containing 0.5% Mg and 1.2% Si and the balance Al and impurities is homogenized according to a conventional method and then hot-rolled to a thickness of 0.4 mm. Further, cold rolling was performed to a thickness of 1 mm. Subsequently, the cold-rolled sheet was heat-treated at a temperature of 550 ° C. for 20 seconds and rapidly cooled to room temperature.
[0024]
The resulting aluminum alloy plate was coated with a lubricating oil A having a viscosity of 3 cSt at a rate of 500 mg / m ² , a lubricating oil B having a viscosity of 70 cSt at 1 g / m ² , and a wax-based lubricating oil C at a rate of ² mg / m ^2. After performing the leveling process under the conditions shown in No. 2, a 100 mm diameter ball bulge test was performed. The results are shown in Table 2. As can be seen in Table 2, the test material No. All of Nos. 5 to 11 have excellent stretch formability, and the test materials No. 5 and No. 11 were subjected to leveling treatment corresponding to the viscosity and type of the lubricating medium. 5-6, 9 and 11 showed particularly good overhanging height.
[0025]
[Table 2]

[0026]
Comparative Example 2
As in Example 2, an ingot of an Al—Mg—Si alloy containing Mg: 0.5% and Si: 1.2% and comprising the balance Al and impurities was homogenized according to a conventional method, and then a thickness of 0. Hot-rolled to 4 mm, and further cold-rolled to a thickness of 1 mm. Subsequently, the cold-rolled sheet was heat-treated at a temperature of 550 ° C. for 20 seconds and rapidly cooled to room temperature.
[0027]
To the resulting aluminum alloy plate, as in the second embodiment, the lubricating oil A 500 mg / m ² of viscosity 3 cSt, 1 g / m ² of lubricant B of viscosity 70 cSt, the lubricant C of the wax system 2 mg / m ² After coating at a ratio and performing a leveling process under the conditions shown in Table 3, a 100 mm diameter ball head overhang test was performed. The results are shown in Table 3.
[0028]
[Table 3]

[0029]
As shown in Table 3, the test material No. Nos. 12, 14 and 15 are inferior in stretch formability because the leveling treatment was not performed after applying the lubricating oil. Test material No. In No. 13, since the leveling treatment temperature is too high, age hardening progresses and the moldability is lowered.
[0030]
【The invention's effect】
According to the present invention, the formability of a forming aluminum alloy plate coated with a lubricating medium such as lubricating oil is further improved , and a plate material having sufficient formability for an automobile outer plate can be obtained. .
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a continuous annealing line incorporating a lubricating medium coating apparatus and a leveling processing apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Continuous annealing furnace 2 Heating device 3 Cooling device 4 Winding device 5 Lubricating medium coating device 6 Leveling processing device 7 Accumulator S Aluminum alloy plate

Claims

After applying a lubricating medium having a viscosity of 1 to 20 cSt (except for a wax-based lubricating medium, the same applies hereinafter) to the surface of the Al-Mg-Si alloy plate for forming, it was applied at a temperature of 30 to 80 ° C. A method for applying a lubricating medium to an aluminum alloy plate for forming, characterized by performing a leveling process on the lubricating medium.

The surface of the Al-Mg-Si alloy plate for forming was coated with a lubricating medium having a viscosity of 20 to 100 cSt (excluding a wax-based lubricating medium, the same applies hereinafter), and then applied at a temperature of 50 to 100 ° C. A method for applying a lubricating medium to an aluminum alloy plate for forming, characterized by performing a leveling process on the lubricating medium.

Coating and leveling process of the lubricating medium, according to claim 1 or 2 lubricating medium application method of the molding processing aluminum alloy plate, wherein the performed after the final heat treatment of the molding for Al-Mg-Si alloy plates.

It is an apparatus for implementing the lubricating medium coating method of the aluminum alloy plate for forming according to claim 1 or 2, comprising a heating apparatus and a cooling apparatus for performing a final heat treatment. It is equipped with a winding device or a cutting device arranged in a subsequent stage, and is provided with a lubricating medium coating device and a lubricating medium leveling device between the cooling device and the winding device or the cooling device and the cutting device, and is subjected to final heat treatment. A lubricating medium is applied to the surface of the Al-Mg-Si alloy plate for forming, and the applied lubricating medium is leveled at a temperature of 30 to 100 ° C. and then wound or cut. An apparatus for applying a lubricating medium for an aluminum alloy plate for forming, characterized in that: