JP2004250790A - Aluminum alloy sheet for bottle can - Google Patents
Aluminum alloy sheet for bottle can Download PDFInfo
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本発明は、絞り加工としごき加工が施されて形成されるボトル形状のアルミニウム缶用のアルミニウム合金板に関し、特に、缶の胴体部に対する口部の絞り比が大きく、且つ、口部の直径が小さいボトル缶に好適なアルミニウム合金板に関する。 The present invention relates to an aluminum alloy plate for a bottle-shaped aluminum can formed by drawing and ironing, and particularly, the drawing ratio of the mouth to the body of the can is large, and the diameter of the mouth is large. The present invention relates to an aluminum alloy plate suitable for a small bottle can.
胴体部とエンド部とタブとを備えてなる従来の２ピース構造のアルミニウム缶においては、所定のアルミニウム合金板にカッピングおよびＤＩ成形（絞り加工、しごき加工）等の缶体成形を施して胴体部を形成した後、この胴体部にネッキングを施して胴体部の径に比べてエンド部の径を小さくしたもの（以下、「２ピースアルミ缶」という。）が主流となっている。このような２ピースアルミ缶では、胴体部の径に対するエンド部の径の絞り比が比較的小さいため、ネッキングが比較的容易であった。 2. Description of the Related Art In a conventional aluminum can having a two-piece structure including a body, an end, and a tab, a predetermined aluminum alloy plate is subjected to can body forming such as cupping and DI forming (drawing and ironing) to form a body. After forming the body, necking is applied to the body to make the diameter of the end smaller than the diameter of the body (hereinafter, referred to as "two-piece aluminum can"). In such a two-piece aluminum can, necking was relatively easy because the drawing ratio of the diameter of the end portion to the diameter of the body portion was relatively small.
一方、近年、胴体部と口部とスクリューキャップを備えてなるボトル形状のアルミニウム缶（以下、「ボトル缶」という。）のニーズが高まり、種々の形態を有するものが開発されてきている。このようなボトル缶においては、胴体部の直径に対する口部の直径の絞り比が前記２ピースアルミ缶に比べて大きいため、ネッキングの際にシワや割れが生じ易かった。 On the other hand, in recent years, there has been an increasing need for a bottle-shaped aluminum can (hereinafter, referred to as a “bottle can”) having a body, a mouth, and a screw cap, and various forms have been developed. In such a bottle can, since the drawing ratio of the diameter of the mouth portion to the diameter of the body portion is larger than that of the two-piece aluminum can, wrinkles and cracks are easily generated at the time of necking.
このようなボトル缶として、主に、胴体部と底部とが各々異なる部材で形成されてなる３ピース構造のボトル缶（スクリューキャップを含む。以下、「３ピースボトル缶」という。）と、胴体部と底部とが一体に形成されてなる２ピース構造のボトル缶（スクリューキャップを含む。以下、「２ピースボトル缶」という。）とが挙げられる。このうち３ピースボトル缶は、一般に、前記従来の２ピースアルミ缶の製造方法の一部を適用して製造されている。（ＰＡＣＫＰＩＡ ２０００／１１ ｐ５６−５９ 「新缶容器「ニューボトル缶」の開発について」参照）。 As such a bottle can, a three-piece bottle can (including a screw cap; hereinafter, referred to as a "three-piece bottle can") having a body portion and a bottom portion formed of different members, respectively, and a body. A two-piece bottle can (including a screw cap; hereinafter, referred to as a "two-piece bottle can") in which a part and a bottom are integrally formed. Of these, three-piece bottle cans are generally manufactured by applying a part of the conventional method for manufacturing a two-piece aluminum can. (See “PACKPIA 2000/11 pp. 56-59“ Development of New Can Container “New Bottle Can” ”).
図３（ａ）は３ピースボトル缶の製造工程の一例を概略的に示す図面、（ｂ）は（ａ）に示す工程によって製造された３ピースボトル缶を模式的に示す斜視図である。図３（ａ）、（ｂ）に示すように、３ピースボトル缶１０では、ＤＩ成形後の缶の底部にネック部３０が形成されるため、胴体部２０の直径Ｄ10に対するネック部３０の直径Ｄ20の絞り比が大きなものでも比較的容易に形成することが可能である。すなわち、３ピースボトル缶においては、胴体部２０に対するネック部３０の絞り比Ｒ2（％）を、Ｒ2＝｛（Ｄ10―Ｄ20）／Ｄ10｝×１００で表すとき、この絞り比Ｒ2が３０％以上である、絞り比が大きなボトル缶でも比較的容易に形成することが可能である。
FIG. 3A is a drawing schematically showing an example of a manufacturing process of a three-piece bottle can, and FIG. 3B is a perspective view schematically showing a three-piece bottle can manufactured by the process shown in FIG. As shown in FIGS. 3A and 3B, in the three-piece bottle can 10, since the
一方、前記３ピースボトル缶に対抗する形で、２ピースボトル缶が実用化された。この２ピースボトル缶では、一般に、従来の２ピースアルミ缶の製造方法の多くが適用され、特にダイネック加工がそのまま用いられている（ＰＡＣＫＰＩＡ ２０００／１２ ｐ１６−２０ 「ボトル缶及びその充填技術の開発」参照）。 On the other hand, two-piece bottle cans have been put into practical use in a manner that opposes the three-piece bottle cans. In this two-piece bottle can, generally, many conventional methods for manufacturing a two-piece aluminum can are applied, and particularly, die neck processing is used as it is (PACKKPIA 2000/12 p16-20 "Development of bottle can and its filling technology"). "reference).
図２に２ピースボトル缶の製造方法を示す。図２に示すように、２ピースボトル缶においては、まず、ボトル缶の胴体部を形成するために所定のアルミニウム合金板ＡにカッピングとＤＩ成形とを施して胴体部と底部とを形成する。次に、トリミング、洗浄・乾燥、印刷・焼付後、前記胴体部の開口部近傍にダイネック加工を施してネック部を形成し、その開口部を口部とする。その後、この口部の近傍の外周にスクリューキャップ取り付け用のネジ切り部を設けて２ピースボトル缶が製造されている。（例えば、特許文献１参照。特許文献１では、１ピースボトル缶と記載されている。） FIG. 2 shows a method for manufacturing a two-piece bottle can. As shown in FIG. 2, in the two-piece bottle can, first, a predetermined aluminum alloy plate A is subjected to cupping and DI molding to form a body of the bottle can, thereby forming a body and a bottom. Next, after trimming, washing / drying, printing and baking, a neck portion is formed near the opening of the body by forming a neck portion, and the opening is used as a mouth. Thereafter, a two-piece bottle can is manufactured by providing a threaded portion for attaching a screw cap on the outer periphery near the mouth. (For example, see Patent Document 1. In Patent Document 1, it is described as a one-piece bottle can.)
そして、前記２ピースボトル缶では、ネック部を形成する際に、ＤＩ成形後の缶（胴体部）の底部をネッキングする３ピースボトル缶と異なり、胴体部の開口部近傍にダイネック加工を施してネック部を形成するため、前記胴体部の直径に対する口部の直径の絞り比を大きくして構成することが困難であった。 In the two-piece bottle can, when forming the neck, unlike the three-piece bottle can which necks the bottom of the can (body) after DI molding, a die neck process is performed near the opening of the body. In order to form the neck, it was difficult to increase the drawing ratio of the diameter of the mouth to the diameter of the body.
すなわち、前記２ピースボトル缶では、一般にＡｌ−Ｍｎ−Ｍｇ系のＪＩＳ３００４合金の硬質板が使用されており、このようなアルミニウム合金の硬質板を用いて前記のように２ピースボトル缶のネック部を形成する場合、このアルミニウム合金板が有する比較的硬い硬質性によって、前記胴体部の直径に対する口部の直径の絞り比を大きくしてボトル缶を形成すると、ネック部にシワや亀裂が発生し易いという問題があった。 That is, in the two-piece bottle can, generally, a hard plate of an Al-Mn-Mg-based JIS 3004 alloy is used. As described above, the neck portion of the two-piece bottle can is formed by using such an aluminum alloy hard plate. When forming a bottle can by forming a bottle can by increasing the drawing ratio of the diameter of the mouth to the diameter of the body, due to the relatively hard hardness of the aluminum alloy plate, wrinkles and cracks are generated in the neck. There was a problem that it was easy.
そして、前記２ピースボトル缶の絞り比を大きくしても、ネック部にシワや亀裂の発生がしにくいボトル缶用アルミニウム合金板として、アルミニウム合金板のＦｅ、Ｓｉ、Ｍｎ、Ｍｇの含有量及び耐力を所定範囲に設定したものが提案されていた（例えば、特許文献１参照）。 And even if the drawing ratio of the two-piece bottle can is increased, the aluminum alloy plate for the bottle can hardly generate wrinkles or cracks in the neck portion, the content of Fe, Si, Mn, and Mg of the aluminum alloy plate and One in which the proof stress is set within a predetermined range has been proposed (for example, see Patent Document 1).
また、一方では、近年、前記２ピースボトル缶内に充填する内容物として、高圧を有する内容物、例えば、高炭酸飲料を使用するニーズも増えてきている。そして、高圧を有する内容物を充填した２ピースボトル缶においては、内容物の漏れ等の低減、またボトル缶の耐圧性を確保するために、キャップを２ピースボトル缶に巻締めする上で、キャップをより深くネジ部に入れることにより、キャップのシール性および耐圧性を高めている。 On the other hand, in recent years, there has been an increasing need to use high-pressure contents, for example, high-carbonated beverages, as contents to be filled in the two-piece bottle can. And in the two-piece bottle can filled with the contents having high pressure, in order to reduce the leakage of the contents and to secure the pressure resistance of the bottle can, in tightening the cap around the two-piece bottle can, By inserting the cap deeper into the threaded portion, the sealing performance and pressure resistance of the cap are enhanced.
しかしながら、前記ボトル缶用アルミニウム合金板を使用して、ネジ山を深くすると、ネジ部の剛性が低下し、キャップ巻締め時に加わるような上からの荷重に絶えきれず変形を起こしてしまう不具合が生じる。ネジ部が変形を起こす荷重（座屈荷重）を向上させるためには、アルミニウム合金板の強度を上げることが望ましいが、強度の高いアルミニウム合金板を使用した場合、２ピースボトル缶のネッキングおよびネジ成形において成形性が低下し、ネック部およびネジ部にシワ、亀裂などが発生しやすいという問題があった。また、アルミニウム合金板の板厚を厚くすることで強度を上げることができるが、ボトル缶底部の肉厚が厚くなり、コスト高となり経済的でない。 However, when the screw thread is deepened using the aluminum alloy plate for a bottle can, the rigidity of the screw portion is reduced, and there is a problem in that the screw portion is constantly deformed by a load applied from above, which is applied when the cap is tightened. Occurs. It is desirable to increase the strength of the aluminum alloy plate in order to improve the load (buckling load) that causes the screw portion to deform. However, when a high-strength aluminum alloy plate is used, necking and screwing of a two-piece bottle can are performed. There has been a problem that the moldability in molding is reduced, and wrinkles, cracks, and the like are easily generated in the neck portion and the screw portion. Although the strength can be increased by increasing the thickness of the aluminum alloy plate, the thickness of the bottom of the bottle can is increased, which increases the cost and is not economical.
そこで、本発明は、このような問題点に鑑み、創案されたもので、その目的は、胴体部の直径に対する口部の直径の絞り比を大きくしたボトル缶においても、ネック部にシワや亀裂およびネジ部に変形（シワや亀裂）を発生させない、しかも、ネジ部の座屈荷重に優れ、ボトル缶底部の肉厚も厚くならないようなボトル缶用アルミニウム合金板を提供することにある。 Accordingly, the present invention has been made in view of such problems, and has as its object to provide wrinkles or cracks in the neck even in a bottle can in which the drawing ratio of the diameter of the mouth to the diameter of the body is increased. Another object of the present invention is to provide an aluminum alloy plate for a bottle can that does not generate deformation (wrinkles or cracks) in the screw portion, has excellent buckling load on the screw portion, and does not increase the thickness of the bottom portion of the bottle can.
本発明者等は、前記した課題を解決するために鋭意検討した結果、Ｆｅ、Ｓｉ、Ｍｎ、ＭｇおよびＣｕの含有量、板厚、２１０℃で１０分間保持した後の０．２％耐力を適正な範囲に規制することによって、アルミニウム合金板の成形性、すなわち、ＤＩ成形、ネッキング等の成形性を向上させることができ、その結果として胴体部の直径に対する口部の直径の絞り比を大きくして、従来の３ピースボトル缶が有するネック部と同程度の形状を備える２ピースボトル缶を形成しても、ネック部およびネジ部にシワや亀裂を発生させない、しかも、ネジ部の座屈荷重に優れ、ボトル缶底部の肉厚も厚くならないボトル缶用アルミニウム合金板を具現化することができることを見いだし、本発明を創作するに至った。 The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that the content of Fe, Si, Mn, Mg and Cu, the plate thickness, and the 0.2% proof stress after holding at 210 ° C. for 10 minutes. By regulating to an appropriate range, the formability of the aluminum alloy plate, that is, the formability such as DI forming and necking can be improved, and as a result, the drawing ratio of the diameter of the mouth portion to the diameter of the body portion can be increased. Then, even if a two-piece bottle can having the same shape as the neck part of the conventional three-piece bottle can is formed, wrinkles and cracks are not generated in the neck part and the screw part, and the buckling of the screw part The present inventors have found that an aluminum alloy plate for a bottle can that is excellent in load and does not increase the thickness of the bottom of the bottle can can be realized, and has led to the creation of the present invention.
すなわち、本発明の請求項１に係るボトル缶用アルミニウム合金板は、胴体部と、底部と、ネジ切り加工が施されたネジ部を備えた口部とが一体に形成されてなるボトル缶において、このボトル缶の胴体部の直径をＤ1とし、口部の直径をＤ2として、前記胴体部の直径に対する口部の直径の絞り比Ｒ1（％）をＲ1＝｛（Ｄ1−Ｄ2）／Ｄ1｝×１００として表したとき、前記絞り比Ｒ1が２０％以上であるボトル缶に用いられるＡｌを主成分とするアルミニウム合金板であって、前記アルミニウム合金板は、Ｆｅを０．２〜０．７質量％、Ｓｉを０．１質量％以上０．５質量％未満、Ｍｎを０．５〜１．２質量％、Ｍｇを１．２質量％を超え１．５質量％以下、Ｃｕを０．１〜０．３質量％含有し、残部がＡｌと不可避的不純物とからなる組成を有し、且つ、前記アルミニウム合金板の板厚が０．３〜０．５ｍｍ、且つ、前記アルミニウム合金板の２１０℃で１０分間保持した後の０．２％耐力が２５０〜２６５Ｎ／ｍｍ2であるように構成される。 That is, the aluminum alloy plate for a bottle can according to claim 1 of the present invention is a bottle can in which a body, a bottom, and a mouth having a threaded portion are integrally formed. , the diameter of the body portion of the bottle can as D 1, the diameter of the mouth portion as D 2, aperture ratio of the diameter of the mouth portion to the diameter of the body portion R 1 a (%) R 1 = {( D 1 - D 2 ) / D 1 ｝ × 100, an aluminum alloy plate containing Al as a main component used for a bottle can having the drawing ratio R 1 of 20% or more, wherein the aluminum alloy plate is made of Fe 0.2 to 0.7% by mass, 0.1 to less than 0.5% by mass of Si, 0.5 to 1.2% by mass of Mn, and 1.5 to 1.5% by mass of Mg. 0.1% to 0.3% by mass of Cu, with the balance being Al and unavoidable impurities It has formed, and the plate thickness of the aluminum alloy plate 0.3 to 0.5 mm, and 0.2% proof stress after holding for 10 minutes at 210 ° C. of the aluminum alloy plate 250~265N / mm It is configured to be 2 .
このように構成すれば、アルミニウム合金板がＦｅ、Ｓｉ、Ｍｎ、Ｍｇ、Ｃｕを所定量含有することにより、アルミニウム合金板中の結晶粒が微細化されると共に、金属間化合物が形成され、その金属間化合物が適正に分散されて、アルミニウム合金板をボトル缶に成形し易くなる。また、Ｍｎ、Ｍｇ、Ｃｕを含有することにより、アルミニウム合金板の強度が上昇すると共に、Ｍｇの含有により、アルミニウム合金板にネック部およびネジ部を成形し易くなる。また、アルミニウム合金板が所定範囲の０．２％耐力を有することにより、成形の際に、素材強度が成形可能な範囲となると共に、ボトル缶の耐圧性が高まる。 With this configuration, the aluminum alloy plate contains Fe, Si, Mn, Mg, and Cu in a predetermined amount, whereby the crystal grains in the aluminum alloy plate are refined and an intermetallic compound is formed. Since the intermetallic compound is properly dispersed, the aluminum alloy plate can be easily formed into a bottle can. Further, by containing Mn, Mg, and Cu, the strength of the aluminum alloy plate is increased, and by containing Mg, it becomes easy to form a neck portion and a screw portion on the aluminum alloy plate. In addition, when the aluminum alloy plate has a 0.2% proof stress in a predetermined range, the material strength is in a range in which the material can be molded during molding, and the pressure resistance of the bottle can is increased.
請求項２に係るボトル缶用アルミニウム合金板は、前記アルミニウム合金板の組成において、（Ｆｅ含有量＋１．０７×Ｍｎ含有量）が１．３０質量％を超え１．５５質量％未満、且つ、（Ｍｎ含有量＋Ｍｇ含有量）が１．７５質量％を超え２．３５質量％未満であるように構成される。
The aluminum alloy sheet for a bottle can according to
このように構成すれば、（Ｆｅ含有量＋１．０７×Ｍｎ含有量）および（Ｍｎ含有量＋Ｍｇ含有量）を所定範囲に規制することにより、金属間化合物分布と強度が最適化し、しごき加工時およびネジ加工時の成形性が向上する。 According to this structure, the distribution and strength of the intermetallic compound are optimized by regulating (Fe content + 1.07 × Mn content) and (Mn content + Mg content) within a predetermined range. And the formability during screw processing is improved.
請求項３に係るボトル缶用アルミニウム合金板は、前記アルミニウム合金板の４５°耳の耳率が、直径が６６ｍｍのアルミニウム合金板からなるブランク板を直径が４０ｍｍのポンチで絞った際に算出されるものであって、前記耳率が３．０％以下であるように構成されている。このように構成すれば、ボトル缶を成形する際に行われるネッキングにおいて、ボトル缶のネック部のトリミングしろを少なくできると共に、ネック部の板厚が均一となる。
The aluminum alloy plate for a bottle can according to
以上説明した通り、本発明に係るボトル缶用アルミニウム合金板によれば、Ｆｅ、Ｓｉ、Ｍｎ、Ｍｇ、Ｃｕの含有量、板厚および０．２％耐力を所定の範囲内に規制したので、成形性が高くなり、従来の３ピースボトル缶が有する胴体部の直径に対する口部の直径の絞り比と同程度の絞り比で成形しても、ネック部やネジ部にシワや亀裂を発生しない２ピースボトル缶を容易に製造することが可能なボトル缶用アルミニウム合金板を提供することができる。 As described above, according to the aluminum alloy sheet for a bottle can according to the present invention, the content, the thickness, and the 0.2% proof stress of Fe, Si, Mn, Mg, and Cu are regulated within a predetermined range. The moldability is high, and even if it is molded at a draw ratio similar to the draw ratio of the mouth diameter to the body diameter of the conventional three-piece bottle can, no wrinkles or cracks occur in the neck or screw portion. An aluminum alloy plate for a bottle can that can easily produce a two-piece bottle can can be provided.
また、本発明に係るボトル缶用アルミニウム合金板によれば、（Ｆｅ含有量＋１．０７×Ｍｎ含有量）および（Ｍｎ含有量＋Ｍｇ含有量）を所定の範囲に規制したので、成形性がさらに高くなり、シワや亀裂を発生しない２ピースボトル缶を容易に製造することが可能なボトル缶用アルミニウム合金板を提供することができる。 Further, according to the aluminum alloy sheet for a bottle can according to the present invention, (Fe content + 1.07 × Mn content) and (Mn content + Mg content) are regulated to predetermined ranges, so that the formability is further improved. It is possible to provide an aluminum alloy plate for a bottle can, which can easily produce a two-piece bottle can that does not generate wrinkles or cracks.
特に、前記胴体部の所定部分にダイネック加工を施してネック部を形成する際に、胴体部の側面方向に対して胴体部とネック部とを結ぶ側面の方向がなす角度が従来の３ピースボトル缶と同程度となるように２ピースボトル缶を形成しても、シワや割れの発生しないボトル缶用アルミニウム合金板を提供することができる。 In particular, when a neck portion is formed by subjecting a predetermined portion of the body portion to die necking, the angle formed by the direction of the side surface connecting the body portion and the neck portion to the side direction of the body portion is a conventional three-piece bottle. Even if a two-piece bottle can is formed so as to have the same size as the can, it is possible to provide an aluminum alloy plate for a bottle can that does not cause wrinkles or cracks.
本発明に係るボトル缶用アルミニウム合金板によれば、前記アルミニウム合金板の４５°耳の耳率を所定の範囲内に規制したので、ボトル缶成形時に施されるトリミングのトリミングしろが少なくなると共に、ネック部の板厚が均一となり、シワや亀裂が発生しないボトル缶用アルミニウム合金板を提供することができる。 According to the aluminum alloy plate for a bottle can according to the present invention, the ear ratio of the 45 ° ear of the aluminum alloy plate is regulated within a predetermined range, so that the trimming margin applied at the time of forming the bottle can is reduced. Further, it is possible to provide an aluminum alloy plate for a bottle can in which the thickness of the neck portion is uniform and wrinkles and cracks do not occur.
以下、本発明の好ましい実施の形態について図面を参照して詳細に説明する。
図１はボトル缶用アルミニウム合金板が適用される一例のボトル缶を模式的に示す斜視図、図２はボトル缶用アルミニウム合金板が適用されるボトル缶の製造工程の一例を概略的に示す説明図である。なお、本発明はこの実施の形態にのみに限定されるものではなく、本発明の技術的思想に基づく限りにおいて適宜に変更することが可能である。
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view schematically showing an example of a bottle can to which an aluminum alloy plate for a bottle can is applied, and FIG. 2 schematically shows an example of a manufacturing process of a bottle can to which an aluminum alloy plate for a bottle can be applied. FIG. It should be noted that the present invention is not limited to this embodiment only, and can be appropriately changed as long as it is based on the technical idea of the present invention.
図１に示すように、本発明に係るボトル缶１は、胴体部２とネック部３と底部６とがＤＩ成形により一体に成形加工されてなる２ピースボトル缶である。すなわち、ボトル缶１は、胴体部２とこの胴体部２の所定部分にネック部３が形成され、このネック部３のエンド部には口部４が形成されている。そしてこの口部４の近傍の外周にはキャップ取り付け用のネジ切り加工が施されてネジ部５が設けられている。そして、この口部４と対向する部分の底部６が胴体部２と連続して構成されている。
As shown in FIG. 1, a bottle can 1 according to the present invention is a two-piece bottle can in which a
そして、本発明に係るボトル缶用アルミニウム合金板が適用されるボトル缶にあっては、図１に示すように、ボトル缶１の胴体部２の直径Ｄ1に対する口部４の直径Ｄ2の絞り比Ｒ1（％）が２０％以上として構成される。すなわち、絞り比Ｒ1（％）を、Ｒ1＝｛（Ｄ1−Ｄ2）／Ｄ1｝×１００とするとき、Ｒ1≧２０（％）となるように構成される。ここで、前記「絞り比」とは、ボトル缶の製造工程で、ネッキングが施される前の直径に対するネッキングが施された後の直径の減少割合を意味するものである。
Then, in the bottle can to which the aluminum alloy plate for a bottle can according to the present invention is applied, as shown in FIG. 1, the diameter D 2 of the mouth 4 with respect to the diameter D 1 of the
したがって、ボトル缶の製造工程で、ネッキングが施される前の胴体部（開口部）の直径が、ネッキングが施されて口部が形成された後の胴体部の直径と略同一であれば、「口部の絞り比」は前式で表される。一方、例えば、ネッキングによって口部が形成された後、胴体部が変形されるなどして、ネッキング前の胴体部（開口部）の直径とネッキングにより口部が形成された後の胴体部の直径とが異なる場合には、前式に含まれるＤ1は、ネッキング前の胴体部（開口部）の直径となる。なお、ここでは、ボトル缶１の製造工程で、ネッキング前の胴体部（開口部）の直径がネッキング後の胴体部の直径と略同一である場合を例に挙げて説明している。 Therefore, in the manufacturing process of the bottle can, if the diameter of the body (opening) before necking is substantially the same as the diameter of the body after the neck is formed and the mouth is formed, "Mouth aperture ratio" is expressed by the previous equation. On the other hand, for example, after the mouth is formed by necking, the body is deformed, and so on. The diameter of the body (opening) before necking and the diameter of the body after the mouth is formed by necking. If the bets are different, D 1 included in the above equation is a body portion of the previous necking (opening) in diameter. Here, in the manufacturing process of the bottle can 1, a case where the diameter of the body (opening) before necking is substantially the same as the diameter of the body after necking is described as an example.
そして、このように、本発明に係るボトル缶用アルミニウム合金板が適用されるボトル缶の胴体部の直径に対する口部の直径の絞り比を２０％以上としてもシワや亀裂が発生しないようにするために、ボトル缶用アルミニウム合金板のＦｅ、Ｓｉ、Ｍｎ、ＭｇおよびＣｕの各含有量と、板厚と、２１０℃で１０分間保持した後の０．２％耐力とを適正な範囲内に規制している。そこで、まずこれらを数値限定した理由について説明する。 As described above, wrinkles and cracks are prevented from occurring even if the drawing ratio of the diameter of the mouth to the diameter of the body of the bottle can to which the aluminum alloy plate for a bottle can according to the present invention is applied is 20% or more. Therefore, the content of each of Fe, Si, Mn, Mg and Cu, the thickness of the aluminum alloy plate for a bottle can, and the 0.2% proof stress after holding at 210 ° C. for 10 minutes are within proper ranges. Regulating. Therefore, the reason for limiting these values first will be described.
《Ｆｅの含有量：０．２〜０．７質量％》
Ｆｅは、アルミニウム合金板中の結晶粒を微細化させるとともに、金属間化合物であるＡｌ−Ｍｎ−Ｆｅ−Ｓｉ（α相）を適正に分散させて、成形性を向上させるために効果的な成分である。すなわち、アルミニウム合金板中のＦｅの含有量が０．２質量％未満では、その効果が充分に得られず、またＦｅの含有量が０．７質量％を超えると化合物（α相）の粗大化による成形性の低下が生じ易くなる。したがって、アルミニウム合金板中のＦｅの含有量は０．２〜０．７質量％とする。
<< Fe content: 0.2 to 0.7% by mass >>
Fe is an effective component for refining crystal grains in an aluminum alloy plate and dispersing Al-Mn-Fe-Si (α phase), which is an intermetallic compound, to improve formability. It is. That is, if the content of Fe in the aluminum alloy plate is less than 0.2% by mass, the effect cannot be sufficiently obtained, and if the content of Fe exceeds 0.7% by mass, the compound (α phase) becomes coarse. This tends to cause a decrease in moldability due to the formation. Therefore, the content of Fe in the aluminum alloy plate is set to 0.2 to 0.7% by mass.
《Ｓｉの含有量：０．１質量％以上０．５質量％未満》
Ｓｉは、アルミニウム合金板中で金属間化合物であるＡｌ−Ｍｎ−Ｆｅ−Ｓｉ（α相）を形成させて成形性を向上させるのに効果的な成分である。すなわち、アルミニウム合金板中のＳｉの含有量が０．１質量％未満では、その効果が小さ過ぎ、またＳｉの含有量が０．５質量％以上では再結晶を阻害し、耳率が不安定になる。したがって、アルミニウム合金板中のＳｉの含有量は０．１質量％以上０．５質量％未満とする。
<< Si content: 0.1% by mass or more and less than 0.5% by mass >>
Si is an effective component for improving the formability by forming Al-Mn-Fe-Si (α phase) as an intermetallic compound in an aluminum alloy plate. That is, when the content of Si in the aluminum alloy plate is less than 0.1% by mass, the effect is too small, and when the content of Si is 0.5% by mass or more, recrystallization is inhibited, and the ear ratio is unstable. become. Therefore, the content of Si in the aluminum alloy plate is set to 0.1% by mass or more and less than 0.5% by mass.
《Ｍｎの含有量：０．５〜１．２質量％》
Ｍｎは、アルミニウム合金板の強度上昇に寄与するとともに、金属間化合物であるＡｌ−Ｍｎ−Ｆｅ−Ｓｉ（α相）を適正に分散させて、しごき成形性を向上させるのに効果的な成分である。すなわち、アルミニウム合金板中のＭｎの含有量が０．５質量％未満では、それらの効果が充分に得られず、またＭｎの含有量が１．２質量％を超えるとＭｎＡｌ6の巨大な初晶が晶出し、成形性が低下する。したがって、アルミニウム合金板中のＭｎの含有量は、０．５〜１．２質量％とする。
<< Mn content: 0.5 to 1.2% by mass >>
Mn is a component that contributes to the increase in strength of the aluminum alloy sheet and is an effective component for appropriately dispersing Al-Mn-Fe-Si (α phase), which is an intermetallic compound, and improving ironing formability. is there. That is, if the content of Mn in the aluminum alloy plate is less than 0.5% by mass, these effects cannot be sufficiently obtained, and if the content of Mn exceeds 1.2% by mass, a huge initial amount of MnAl 6 is obtained. Crystals are crystallized, and formability decreases. Therefore, the content of Mn in the aluminum alloy plate is set to 0.5 to 1.2% by mass.
《Ｍｇの含有量：１．２質量％を超え１．５質量％以下》
Ｍｇは、アルミニウム合金中に単独で固溶してアルミニウム合金板の強度上昇に寄与する。また、Ｍｇは、後記するようなアルミニウム合金板中にＣｕが固溶している場合、Ａｌ−Ｃｕ−Ｍｇ系の金属間化合物を析出させて、ボトル缶成形時のベーキングによるアルミニウム合金板の軟化防止に有効な成分である。
<< Mg content: more than 1.2% by mass and 1.5% by mass or less >>
Mg alone forms a solid solution in the aluminum alloy and contributes to an increase in strength of the aluminum alloy plate. When Cu is dissolved in an aluminum alloy plate as described later, Mg precipitates an Al-Cu-Mg intermetallic compound and softens the aluminum alloy plate by baking during bottle can molding. It is an effective ingredient for prevention.
すなわち、アルミニウム合金板中のＭｇの含有量が前記範囲内であれば前記したいずれの効果も充分に得ることができるが、Ｍｇの含有量が１．２質量％以下では必要な座屈荷重が確保できず、１．５質量％を超えるとネッキング後の素材耐力および伸びが成形可能な範囲を超えてしまう。したがって、アルミニウム合金板中のＭｇの含有量は、１．２質量％を超え１．５質量％以下とする。 That is, if the content of Mg in the aluminum alloy plate is within the above range, any of the above-mentioned effects can be sufficiently obtained, but if the content of Mg is 1.2% by mass or less, a necessary buckling load is reduced. If it exceeds 1.5% by mass, the yield strength and elongation after necking exceed the moldable range. Therefore, the content of Mg in the aluminum alloy plate is set to more than 1.2% by mass and 1.5% by mass or less.
《Ｃｕの含有量：０．１〜０．３質量％》
Ｃｕは、アルミニウム合金の強度上昇に効果的であるとともに、アルミニウム合金板中に固溶している場合、Ａｌ−Ｃｕ−Ｍｇ系の金属間化合物を析出させて、ボトル缶成形時のベーキングによるアルミニウム合金板の軟化防止に有効な成分である。すなわち、アルミニウム合金板中のＣｕの含有量が０．１質量％未満ではこれらの効果が小さく、またＣｕの含有量が０．３質量％を超えるとアルミニウム合金板の強度上昇の効果が過剰となって好ましくない。したがって、アルミニウム合金板中のＣｕの含有量は０．１〜０．３質量％とする。
<< Cu content: 0.1 to 0.3% by mass >>
Cu is effective in increasing the strength of the aluminum alloy, and when solid-dissolved in the aluminum alloy plate, precipitates an Al-Cu-Mg-based intermetallic compound to form aluminum by baking during bottle can molding. It is an effective component for preventing the softening of the alloy sheet. That is, when the content of Cu in the aluminum alloy plate is less than 0.1% by mass, these effects are small, and when the content of Cu exceeds 0.3% by mass, the effect of increasing the strength of the aluminum alloy plate is excessive. It is not preferable. Therefore, the content of Cu in the aluminum alloy plate is set to 0.1 to 0.3% by mass.
なお、本発明においては、不可避的不純物として、Ｃｒ：０．１質量％以下、Ｚｎ：０．５質量％以下、Ｔｉ：０．１質量％以下、Ｚｒ：０．１質量％以下、Ｂ：０．１質量％以下の含有は本発明の効果を妨げるものではなく、このような不可避的不純物の含有は許容される。 In the present invention, as unavoidable impurities, Cr: 0.1% by mass or less, Zn: 0.5% by mass or less, Ti: 0.1% by mass or less, Zr: 0.1% by mass or less, B: The content of 0.1% by mass or less does not hinder the effect of the present invention, and the content of such inevitable impurities is allowed.
《板厚：０．３〜０．５ｍｍ》
前記絞り比の大きいボトル缶を成形するためには、ネック部およびネジ部の板厚を従来のボトル缶より厚くする必要がある。板厚が０．３ｍｍ未満では、必要な素材を確保するためにブランク径（図２のカッピング時のカップを成形する前のブランク板の径）を大きくしなければならず、絞り成形が難しくなる。また、板厚が０．５ｍｍを超えるとボトル缶の底部の肉厚が過剰に厚くなり、コスト高になり、経済的でなくなる。したがって、板厚は０．３〜０．５ｍｍとする。
<< Thickness: 0.3 ~ 0.5mm >>
In order to form a bottle can having a large drawing ratio, the neck portion and the screw portion need to be thicker than conventional bottle cans. If the plate thickness is less than 0.3 mm, the blank diameter (the diameter of the blank plate before forming the cup at the time of cupping in FIG. 2) must be increased in order to secure a necessary material, and draw forming becomes difficult. . On the other hand, if the plate thickness exceeds 0.5 mm, the thickness of the bottom of the bottle can becomes excessively large, which increases the cost and is not economical. Therefore, the plate thickness is set to 0.3 to 0.5 mm.
《０．２％耐力：２５０〜２６５Ｎ／ｍｍ2》
この０．２％耐力は、アルミニウム合金板を２１０℃で１０分間保持した後、引張試験を行い得られたものである。本発明に係るボトル缶用アルミニウム合金板にＤＩ成形、トリミングを行った後、ボトル缶の胴体部の直径に対する口部の直径の比率である絞り比を２０％以上として、絞り比の高いネッキングを施してボトル缶を形成する際、アルミニウム合金板の０．２％耐力が２５０Ｎ／ｍｍ2未満では、形成されたボトル缶の座屈荷重が十分ではなく、２６５Ｎ／ｍｍ2を超えるとネッキング後の素材耐力および伸びが成形可能な範囲を超えてしまう。したがって、アルミニウム合金板の０．２％耐力は２５０〜２６５Ｎ／ｍｍ2とする。
<< 0.2% proof stress: 250-265 N / mm 2 >>
The 0.2% proof stress was obtained by holding the aluminum alloy plate at 210 ° C. for 10 minutes and then performing a tensile test. After performing DI molding and trimming on the aluminum alloy plate for a bottle can according to the present invention, the necking having a high drawing ratio is set to 20% or more, which is a ratio of the diameter of the mouth portion to the diameter of the body portion of the bottle can. subjected during the formation of the bottle can, in the 0.2% proof stress is less than 250 N / mm 2 of the aluminum alloy plate, of the formed bottle can buckling load is not sufficient, after necking exceeds 265N / mm 2 The yield strength and elongation of the material exceed the range that can be molded. Therefore, the 0.2% proof stress of the aluminum alloy plate is set to 250 to 265 N / mm 2 .
また、ボトル缶用アルミニウム合金板の組成において、（Ｆｅ含有量＋１．０７×Ｍｎ含有量）および（Ｍｎ含有量＋Ｍｇ含有量）を所定範囲内に規制することにより、シワや亀裂の発生がさらに防止される。以下に、これらを数値限定した理由について説明する。 Further, in the composition of the aluminum alloy plate for a bottle can, by regulating (Fe content + 1.07 × Mn content) and (Mn content + Mg content) within a predetermined range, wrinkles and cracks are further reduced. Is prevented. Hereinafter, the reasons for limiting the numerical values will be described.
《（Ｆｅ含有量＋１．０７×Ｍｎ含有量）が１．３０質量％を超え１．５５質量％未満、且つ、（Ｍｎ含有量＋Ｍｇ含有量）が１．７５質量％を超え２．３５質量％未満》
本発明では、金属間化合物分布と強度を最適化することにより、成形性により優れた高強度材を得ることができる。すなわち、（Ｆｅ含有量＋１．０７×Ｍｎ含有量）が１．３０質量％以下では、しごき加工時の成形性がやや低下し、また１．５５質量％以上では、ネジ加工時に表面の亀裂（塗膜亀裂）を多少招き、内容物の品質維持が万全ではなくなる。また、（Ｍｎ含有量＋Ｍｇ含有量）が１．７５質量％以下では、強度がやや低下し、さらに、２．３５質量％以上では、しごき加工時の成形性およびネジ加工時の成形性（塗膜性能）がやや低下する。
したがって、Ｆｅ、Ｍｎ、Ｍｇは、上記関係式を満足することが好ましい。
更に好ましくは、（Ｍｎ含有量＋Ｍｇ含有量）が１．９０質量％を超え２．２０質量％未満である。
<< (Fe content + 1.07 × Mn content) is more than 1.30% by mass and less than 1.55% by mass, and (Mn content + Mg content) is more than 1.75% by mass and 2.35% by mass %Less than"
In the present invention, a high-strength material having more excellent moldability can be obtained by optimizing the distribution and strength of the intermetallic compound. That is, when (Fe content + 1.07 × Mn content) is 1.30% by mass or less, the formability at the time of ironing is slightly lowered, and at 1.55% by mass or more, cracks on the surface during screwing ( This causes some cracks in the coating film, and the quality of the content is not maintained perfectly. When the (Mn content + Mg content) is 1.75% by mass or less, the strength is slightly reduced. When the content is 2.35% by mass or more, the formability during ironing and the formability during screw processing (coating) are reduced. Film performance) slightly decreases.
Therefore, it is preferable that Fe, Mn, and Mg satisfy the above relational expression.
More preferably, (Mn content + Mg content) is more than 1.90% by mass and less than 2.20% by mass.
また、ボトル缶用アルミニウム合金板の４５°耳の耳率を適正な範囲内に規制することにより、シワや亀裂の発生がさらに防止される。以下に、これらを数値限定した理由について説明する。 Further, by restricting the ear ratio of the 45 ° ear of the aluminum alloy plate for a bottle can within an appropriate range, the occurrence of wrinkles and cracks is further prevented. Hereinafter, the reasons for limiting the numerical values will be described.
《４５°耳の耳率：３．０％以下》
４５°耳の耳率は、直径が６６ｍｍのアルミニウム合金板からなるブランク板を直径が４０ｍｍのポンチで絞り、このようにして形成した絞りカップのカップ高さに対する４５°耳の耳高さの割合として下式によって算出した。
<< Earth ratio of 45 ° ear: 3.0% or less >>
The ear ratio of the 45 ° ear is a ratio of the ear height of the 45 ° ear to the cup height of the drawn cup formed by squeezing a blank plate made of an aluminum alloy plate having a diameter of 66 mm with a punch having a diameter of 40 mm. Was calculated by the following equation.
上式において、ｈＸはアルミニウム合金板の圧延方向に対してＸ°方向の絞りカップの高さｈを表す。そして、本発明に係るボトル缶用アルミニウム合金板に、ボトル缶の胴体部の直径に対する口部の直径の比率である絞り比を２０％以上として絞り比の高いネッキングを施した場合、このアルミニウム合金板が有する耳率に応じてネッキング中に４５°耳が発達する。その際、この４５°耳が過度に発達した場合には、ネック成形性が阻害されないようにネッキングの途中で数回程度のトリミングを行なうことが必要となる。 In the above equation, hX represents the height h of the drawing cup in the X ° direction with respect to the rolling direction of the aluminum alloy sheet. When the aluminum alloy plate for a bottle can according to the present invention is subjected to necking with a high draw ratio by setting the draw ratio, which is the ratio of the diameter of the mouth portion to the diameter of the body portion of the bottle can, to 20% or more, this aluminum alloy A 45 ° ear develops during necking depending on the ear coverage of the board. At this time, when the 45 ° ear is excessively developed, it is necessary to perform trimming about several times during necking so that neck formability is not hindered.
すなわち、アルミニウム合金板の４５°耳の耳率が３．０％を超えるとネッキング中の４５°耳が過剰に高くなってトリミングしろやトリミング回数を増加させなければならず、また、ネック部の板厚が周方向で不均一となるため、ネック成形性が低下するなどの不具合が生じる。したがって、本発明に係るボトル缶用アルミニウム合金板にあっては、４５°耳の耳率を３．０％以下とすることが好ましい。 That is, when the ear ratio of the 45 ° ear of the aluminum alloy plate exceeds 3.0%, the 45 ° ear during necking becomes excessively high, so that the margin for trimming and the number of times of trimming must be increased. Since the plate thickness becomes uneven in the circumferential direction, problems such as a decrease in neck formability occur. Therefore, in the aluminum alloy plate for a bottle can according to the present invention, the ear ratio of the 45 ° ear is preferably 3.0% or less.
なお、この４５°耳の耳率は３．０％以下であればマイナスの大きさであってもよいが、過度に低くなると、例えば０°または１８０°方向で発生した耳による耳切れの発生や前記と同様にトリミングの必要性等の問題が出てくる場合があるため、この４５°耳の耳率は−１．０〜３．０％の範囲内であることが望ましい。これにより、２０％以上という高い絞り比でネッキングした場合にも、ネッキング後に発生する４５°耳の山と谷との差が０．７ｍｍ以下となり、ネック成形性およびトリミング性が良好となる。 The ear ratio of the 45 ° ear may be a negative value as long as the ear ratio is 3.0% or less, but if the ear ratio is excessively low, for example, the occurrence of ear breakage due to the ear generated in the 0 ° or 180 ° direction. In some cases, problems such as the necessity of trimming may occur in the same manner as described above. Therefore, the ear ratio of the 45 ° ear is preferably in the range of −1.0 to 3.0%. As a result, even when necking is performed at a high drawing ratio of 20% or more, the difference between the peak and the valley at the 45 ° ear generated after necking is 0.7 mm or less, and the neck formability and trimming properties are improved.
次に、本発明に係るボトル缶用アルミニウム合金板にあっては、従来のアルミニウム合金板の製造方法を用いて製造することができる。すなわち、本発明に係るボトル缶用アルミニウム合金板は、まず、常法に従って本発明に係る組成を有するアルミニウム合金板の鋳塊を作製し、このアルミニウム合金板の鋳塊に均質化熱処理を施した後、熱間圧延を施し、続いて、焼鈍処理を施した後、冷間圧延処理を施して作製することができる。なお、前記熱間圧延と冷間圧延との間に行われる焼鈍処理は省略することも可能である。 Next, the aluminum alloy plate for a bottle can according to the present invention can be manufactured using a conventional method for manufacturing an aluminum alloy plate. That is, the aluminum alloy plate for a bottle can according to the present invention was prepared by first preparing an ingot of an aluminum alloy plate having a composition according to the present invention according to a conventional method, and subjecting the ingot of the aluminum alloy plate to a homogenizing heat treatment. Thereafter, it can be manufactured by performing hot rolling, subsequently performing an annealing process, and then performing a cold rolling process. Note that the annealing performed between the hot rolling and the cold rolling can be omitted.
なお、ここで常法とは、板厚５００〜６００ｍｍに鋳造し、面削後に５５０〜６２０℃の均質化熱処理を施して熱間圧延を行う。熱間圧延では、板厚２〜５ｍｍでコイル状に巻き取るが、その時の温度は３００℃以上が望ましい。巻き取り時の温度が３２０℃を越える場合には、その後の焼鈍を省略できる。更にその後、冷間圧延を施して所定の板厚０．３〜０．５ｍｍに仕上げる。また、０．２％耐力および４５°耳の耳率の制御は主として化学成分と熱間圧延時の巻き取り温度をコントロールして行う。巻き取り温度３００℃未満では再結晶が不十分となり、０．２％耐力が上昇し、４５°耳率も高くなる。 Here, the ordinary method is to cast a steel sheet to a thickness of 500 to 600 mm, perform a homogenizing heat treatment at 550 to 620 ° C. after face milling, and perform hot rolling. In hot rolling, the sheet is wound into a coil with a thickness of 2 to 5 mm, and the temperature at that time is desirably 300 ° C. or higher. When the temperature at the time of winding exceeds 320 ° C., subsequent annealing can be omitted. After that, cold rolling is performed to finish to a predetermined thickness of 0.3 to 0.5 mm. The 0.2% proof stress and the 45 ° ear ratio are controlled mainly by controlling the chemical components and the winding temperature during hot rolling. If the winding temperature is lower than 300 ° C., recrystallization becomes insufficient, the 0.2% proof stress increases, and the 45 ° ear ratio increases.
その後、図２に示すように、２ピースボトル缶の製造方法である、カッピング、ＤＩ成形、トリミング、洗浄（図示省略）、印刷（図示省略）、ベーキング（図示省略）、ネッキング等の工程を経て所定の形状に成形加工され、さらに口部の近傍の外周にスクリューキャップ取り付け用のネジ切り加工が施されてネジ部が形成され、口部の直径が、胴体部の直径に対して小さく形成された２ピースボトル缶が得られる。 Then, as shown in FIG. 2, through the steps of manufacturing two-piece bottle cans, such as cupping, DI molding, trimming, cleaning (not shown), printing (not shown), baking (not shown), necking, and the like. It is formed into a predetermined shape, and a threading process for attaching a screw cap is performed on the outer periphery near the mouth to form a screw portion, and the diameter of the mouth portion is formed smaller than the diameter of the body portion. A two-piece bottle can is obtained.
なお、本発明に係るボトル缶用アルミニウム合金板が適用されるボトル缶においては、図１に示すようなネック部３と胴体部２とを結ぶ側面が胴体部２の側面となす角度は、前記絞り比が本発明で規制する範囲内であれば、特に限定されるものではない。また、本発明に係るボトル缶用アルミニウム合金板が適用されるボトル缶に用いられるスクリューキャップは、特に限定されるものではなく、従来、通常に使用されているものを準用することができる。
In a bottle can to which the aluminum alloy plate for a bottle can according to the present invention is applied, the angle formed by the side surface connecting the
以上、本発明に係るボトル缶用アルミニウム合金板の実施の形態として、本発明に好適な図１に示すような形状を有するボトル缶を用いて説明したが、本発明はこのような実施の形態のみに限定されるものではなく、本発明で規制する前記の絞り比が２０％以上であるようなボトル缶であればよい。例えば、本発明に係るボトル缶用アルミニウム合金板は、胴体部の側面が湾曲した形状にも適用することが可能である。 As described above, an embodiment of the aluminum alloy plate for a bottle can according to the present invention has been described using a bottle can having a shape as shown in FIG. 1 which is suitable for the present invention. The present invention is not limited to this, and any bottle can be used as long as the above-mentioned restriction ratio regulated by the present invention is 20% or more. For example, the aluminum alloy plate for a bottle can according to the present invention can be applied to a shape in which a side surface of a body portion is curved.
以下、本発明に係るボトル缶用アルミニウム合金板について、実施例を挙げて具体的に説明する。なお、本発明は、この実施例のみに限定されるものではなく、本発明の技術的思想に基づく限りにおいて適宜に変更することが可能である。 Hereinafter, the aluminum alloy plate for a bottle can according to the present invention will be specifically described with reference to examples. It should be noted that the present invention is not limited to only this embodiment, and can be appropriately modified as long as it is based on the technical idea of the present invention.
（第１の実施例）
本発明に係るボトル缶用アルミニウム合金板の必要条件を満たす実施例（Ｎｏ．１〜７）と本発明の必要条件を満たさない比較例（Ｎｏ．１〜１７）の供試材の構成を表１に、各々の供試材について行ったボトル缶の各特性に関する評価結果を表２に示す。
(First embodiment)
Table 1 shows the configurations of the test materials of Examples (Nos. 1 to 7) satisfying the requirements of the aluminum alloy plate for bottle cans according to the present invention and Comparative Examples (Nos. 1 to 17) not satisfying the requirements of the present invention. Table 1 shows the results of the evaluation of the properties of the bottle cans performed on each test material.
（供試材の作製）
表１に示す成分を有したアルミニウム合金板の供試材を、従来の通常の方法で製造した。また、０．２％耐力および４５°耳の耳率は、前記の手法によって各供試材のＮ数を２として測定し、その平均値から求めた。
(Preparation of test material)
A test material of an aluminum alloy plate having the components shown in Table 1 was produced by a conventional method. Further, the 0.2% proof stress and the ear ratio of the 45 ° ear were measured by the above-described method with the N number of each test material being 2, and the average value was obtained.
（供試材の評価方法）
（１）しごき成形性
アルミニウム合金板に対して胴体部の直径が６６ｍｍとなるようにＤＩ成形（絞り加工、しごき加工）を施し、ＤＩ成形品を１００００缶作製した。なお、最終しごき加工率を４５％と破断しやすい条件にして、破断促進試験とした。そして、前記ＤＩ成形品１００００缶について、破断が発生した缶の数によって、このしごき成形性を評価した。すなわち、破断が発生した缶が１００００缶中、１缶以下であったものを「○（良好）」、２〜４缶であったものを「△（概ね良好）」、５缶を超えたものを「×（不良）」とした。
(Method of evaluating test materials)
(1) Ironing Formability DI forming (drawing and ironing) was performed on the aluminum alloy plate so that the body part had a diameter of 66 mm, and 10,000 DI-formed products were produced. The breaking acceleration test was performed under the condition that the final ironing rate was 45% and the condition was easy to break. Then, the ironing formability of 10,000 DI cans was evaluated by the number of broken cans. That is, if the number of cans that broke was 10000 or less, 1 (or less) cans were evaluated as “○ (good)”, 2 to 4 cans were evaluated as “△ (generally good)”, and more than 5 cans Was evaluated as “× (bad)”.
（２）ネック成形性
前記ＤＩ成形品に、トリミング、洗浄、ベーキング（最高保持温度：２１０℃）行ない、続いて口部の直径が４０ｍｍとなる（胴体部の直径に対する口部の直径の絞り比が３９．４％である状態）までダイネック方式によりネッキングを施し、ネッキング品を作製した。そして、前記ネッキング品について、シワの発生具合によって、ネック成形性を評価した。すなわち、シワの発生が全く見られなかったものを「○（良好）」、シワの発生が若干見られたものを「△（概ね良好）」、顕著なシワの発生が見られたものを「×（不良）」とした。
(2) Neck Formability The DI molded product is subjected to trimming, washing, and baking (maximum holding temperature: 210 ° C.), and then the diameter of the mouth becomes 40 mm (drawing ratio of the diameter of the mouth to the diameter of the body). Was 39.4%) to form a necked product. With respect to the necked product, neck formability was evaluated according to the degree of wrinkling. That is, "○ (good)" indicates that no wrinkles were observed, "△ (generally good)" indicates that some wrinkles were observed, and "を (generally good)" indicates that wrinkles were observed. × (bad) ”.
（３）トリミング性
前記ネッキング品について、４５°耳の山と谷との差によって、トリミング性を評価した。すなわち、４５°耳の山と谷との差が０．５ｍｍ未満であったものを「○（良好）」、０．５〜０．７ｍｍであったものを「△（概ね良好）」、０．７ｍｍを超えたものを「×（不良）」とした。
(3) Trimming property The trimming property of the necked product was evaluated by the difference between the peak and the valley of the 45 ° ear. That is, when the difference between the peak and the valley at the 45 ° ear was less than 0.5 mm, “○ (good)”, and when the difference was 0.5 to 0.7 mm, “△ (generally good)”, 0 Those exceeding 0.7 mm were designated as “x (bad)”.
（４）ネジ成形性
前記ネッキング品にネジ・カーリング成形を施してボトル缶を作製した。そして、そのボトル缶のネジ部の割れ等の発生状況によって、ネジ成形性を評価した。すなわち、割れや顕著なクビレがないものを「○（良好）」、クビレが若干あるものを「△（概ね良好）」、亀裂や割れが発生したものを「×（不良）」とした。
(4) Screw Formability A bottle can was produced by subjecting the necked product to screw curling. The screw formability was evaluated based on the occurrence of cracks in the screw portion of the bottle can. That is, a sample having no cracks or remarkable cracks was evaluated as “○ (good)”, a sample having slight cracks was evaluated as “Δ (generally good)”, and a sample having cracks or cracks was evaluated as “x (bad)”.
（５）座屈荷重
前記ボトル缶に上部から荷重を加えていき、ボトル缶が塑性変形したときのピーク荷重を測定し、５缶の平均値を座屈荷重として評価した。高耐圧の内容物を巻締めすることを考慮して、座屈荷重が１８００Ｎ以上のものを良好とした。
(5) Buckling load A load was applied to the bottle can from above, the peak load when the bottle can was plastically deformed was measured, and the average value of the five cans was evaluated as the buckling load. Considering that the contents with high pressure resistance were wound around, those having a buckling load of 1800 N or more were evaluated as good.
表１、２に示すように、本発明に係るボトル缶用アルミニウム合金板の必要条件を全て満たす実施例１〜７にあっては、いずれもボトル缶の成形時に要求されるしごき成形性、ネック成形性、トリミング性、ネジ成形性が「○（良好」および座屈荷重が充分であり、ボトル缶の成形時に要求される特性が充分に満たされているという結果が得られた。 As shown in Tables 1 and 2, in Examples 1 to 7 which satisfy all the necessary conditions for the aluminum alloy plate for bottle cans according to the present invention, the ironing formability and neck required for molding bottle cans are all required. The results were that the formability, trimming property, and screw formability were “○ (good)”, the buckling load was sufficient, and the characteristics required at the time of molding the bottle can were sufficiently satisfied.
それに対して、本発明の必要条件を満たさない比較例１〜１７においては、Ｓｉ、Ｆｅ、Ｍｎ、Ｍｇ、Ｃｕ含有量、（Ｆｅ含有量＋１．０７×Ｍｎ含有量）、（Ｍｎ含有量＋Ｍｇ含有量）、耳率、板厚および０．２％耐力のいずれかが本発明で規制する範囲外であるため、本発明に係るボトル缶の成形時に要求される特性が充分に満たされていないという結果が得られた。 On the other hand, in Comparative Examples 1 to 17 that do not satisfy the necessary conditions of the present invention, the contents of Si, Fe, Mn, Mg, and Cu, (Fe content + 1.07 × Mn content), (Mn content + Mg content) Content), ear ratio, plate thickness, and 0.2% proof stress are out of the range regulated by the present invention, and thus the properties required at the time of molding the bottle can according to the present invention are not sufficiently satisfied. The result was obtained.
すなわち、表１、２に示すように、比較例１、２は、Ｓｉ、Ｍｇの含有量、耳率、０．２％耐力が本発明で規制する範囲から外れている（ただし、耳率は望ましい範囲から外れている）。その結果、しごき成形性、ネック成形性が「△（概ね良好）」、トリミング性の評価が「△（概ね良好）」または「×（不良）」、座屈荷重も充分でないことがわかる。 That is, as shown in Tables 1 and 2, in Comparative Examples 1 and 2, the content of Si and Mg, the ear ratio, and the 0.2% proof stress were out of the range regulated by the present invention (however, the ear ratio was Outside the desired range). As a result, it can be seen that the ironing formability and the neck formability were “△ (generally good)”, the evaluation of the trimming property was “△ (generally good)” or “× (bad)”, and the buckling load was not sufficient.
また、比較例３、４はＦｅ、Ｍｇの含有量、（Ｆｅ含有量＋１．０７×Ｍｎ含有量）、耳率、０．２％耐力が本発明で規制する範囲から外れている（ただし、耳率は望ましい範囲から外れている）。その結果、しごき成形性、ネック成形性が「△（概ね良好）」、トリミング性の評価が「△（概ね良好）」または「×（不良）」、座屈荷重も充分でないことがわかる。 In Comparative Examples 3 and 4, the contents of Fe and Mg, (Fe content + 1.07 × Mn content), ear ratio, and 0.2% proof stress were out of the range regulated by the present invention (however, Ear rate is outside the desired range). As a result, it can be seen that the ironing formability and the neck formability were “△ (generally good)”, the evaluation of the trimming property was “△ (generally good)” or “× (bad)”, and the buckling load was not sufficient.
また、比較例５はＭｎ、Ｍｇの含有量、（Ｆｅ含有量＋１．０７×Ｍｎ含有量）、（Ｍｎ含有量＋Ｍｇ含有量）、０．２％耐力が本発明で規制する範囲から外れている。その結果、しごき成形性が「×（不良）」、座屈強度が充分でないことがわかる。また、比較例６は、Ｍｎ、Ｍｇの含有量、（Ｆｅ含有量＋１．０７×Ｍｎ含有量）が本発明で規制する範囲から外れている。その結果、しごき成形性、ネック成形性が「△（概ね良好）」であることがわかる。 In Comparative Example 5, the Mn and Mg contents, (Fe content + 1.07 × Mn content), (Mn content + Mg content), and 0.2% proof stress were out of the range regulated by the present invention. I have. As a result, it was found that the ironing formability was “× (poor)” and the buckling strength was not sufficient. In Comparative Example 6, the contents of Mn and Mg and (Fe content + 1.07 × Mn content) were out of the range regulated by the present invention. As a result, it can be seen that the ironing formability and the neck formability are “△ (generally good)”.
また、比較例７はＭｇの含有量、０．２％耐力が本発明で規制する下限値未満で、トリミング性が「△（概ね良好）」、座屈荷重が充分でないことがわかる。また、比較例８はＭｇの含有量、（Ｍｎ含有量＋Ｍｇ含有量）、０．２％耐力が本発明で規制する上限値を超え、ネック成形性、トリミング性が「×（不良）」、ネジ成形性が「△（概ね良好）」であることがわかる。 Comparative Example 7 shows that the content of Mg and the 0.2% proof stress are less than the lower limits regulated by the present invention, the trimming property is “△ (generally good)”, and the buckling load is not sufficient. In Comparative Example 8, the Mg content, (Mn content + Mg content), and the 0.2% proof stress exceeded the upper limit values regulated by the present invention, and the neck moldability and trimming properties were “× (bad)”. It can be seen that the screw formability is “△ (generally good)”.
また、比較例９はＭｇ、Ｃｕの含有量、０．２％耐力が本発明で規制する下限値未満で、座屈荷重が充分でないことがわかる。また、比較例１０はＭｇの含有量が本発明で規制する下限値未満、Ｃｕの含有量、０．２％耐力が本発明で規制する上限値を超え、ネック成形性、トリミング性、ネジ成形性が「×（不良）」であることがわかる。 Further, in Comparative Example 9, the content of Mg and Cu and the 0.2% proof stress were less than the lower limits regulated by the present invention, and it was found that the buckling load was not sufficient. In Comparative Example 10, the content of Mg was less than the lower limit regulated by the present invention, the content of Cu, the 0.2% proof stress exceeded the upper limit regulated by the present invention, and the neck formability, trimming property, and screw forming were limited. It can be seen that the property is “× (bad)”.
また、比較例１１、１２はＭｇの含有量、耳率、０．２％耐力が本発明で規制する範囲から外れている（ただし、耳率は望ましい範囲から外れている）。その結果、ネック成形性、トリミング性が「△（概ね良好）」、「×（不良）」、座屈荷重が充分でないことがわかる。 In Comparative Examples 11 and 12, the Mg content, the ear ratio, and the 0.2% proof stress were out of the ranges regulated by the present invention (however, the ear ratio was out of the desired range). As a result, it can be seen that the neck formability and the trimming property are “△ (generally good)” and “× (poor)” and the buckling load is not sufficient.
また、比較例１３は板厚が本発明で規制する下限値未満で、しごき成形性が「×（不良）」、トリミング性が「△（概ね良好）」であることがわかる。また、比較例１４は板厚が本発明で規制する上限値を超え、表１に記載された特性は「○（良好）」であるが、ボトル缶底部の肉厚が厚くなり経済的でない。つまり、ボトル缶底部の肉厚が薄いボトル缶に対してコスト高となる。 In Comparative Example 13, the sheet thickness was less than the lower limit value regulated by the present invention, and the ironing formability was “× (poor)” and the trimming property was “△ (generally good)”. Further, in Comparative Example 14, the plate thickness exceeded the upper limit value regulated by the present invention, and the characteristics described in Table 1 are “○ (good)”, but the thickness of the bottom portion of the bottle can is large, which is not economical. In other words, the cost is higher for a bottle can having a thin bottom at the bottom of the bottle can.
また、比較例１５は０．２％耐力が本発明で規制する下限値未満で、座屈荷重が充分でないことがわかる。また、比較例１６は０．２％耐力が本発明で規制する上限値を超え、ネック成形性、ネジ成形性が「×（不良）」、トリミング性が「△（概ね良好）」であることがわかる。 In addition, in Comparative Example 15, the 0.2% proof stress is less than the lower limit value regulated by the present invention, and the buckling load is not sufficient. Further, in Comparative Example 16, the 0.2% proof stress exceeded the upper limit value regulated by the present invention, the neck formability and the screw formability were “× (bad)”, and the trimming property was “△ (generally good)”. I understand.
さらに、比較例１７は（Ｆｅ含有量＋１．０７×Ｍｇ含有量）、（Ｍｎ含有量＋Ｍｇ含有量）、０．２％耐力が本発明で規制する下限値未満で、しごき加工性が「×（不良）」、座屈荷重が充分でない。 Further, in Comparative Example 17, (Fe content + 1.07 x Mg content), (Mn content + Mg content), the 0.2% proof stress were less than the lower limit value regulated by the present invention, and the ironing workability was "x". (Poor), buckling load is not sufficient.
（第２の実施例）
本発明に係るボトル缶用アルミニウム合金板の供試材（実施例８〜１１）を、第１の実施例と同様の方法で製造し、その構成を表３に示す。ただし、実施例８の供試材は実施例１と同様とした。これらの供試材を、第１の実施例と同様な評価方法で評価し、その評価結果を表４に示す。ただし、各特性の評価は、ＤＩ成形品５００００缶を用いて行った。
(Second embodiment)
Test materials (Examples 8 to 11) of the aluminum alloy plate for bottle cans according to the present invention were manufactured by the same method as in the first example, and the configuration is shown in Table 3. However, the test material of Example 8 was the same as that of Example 1. These test materials were evaluated by the same evaluation method as in the first example, and the evaluation results are shown in Table 4. However, evaluation of each characteristic was performed using 50,000 cans of DI molded products.
表３、４に示すように、実施例８は、Ｓｉ、Ｆｅ、Ｍｎ、Ｍｇ、Ｃｕ含有量、（Ｆｅ含有量＋１．０７×Ｍｎ含有量）、（Ｍｎ含有量＋Ｍｇ含有量）、耳率、板厚および０．２％耐力の全ての構成が本発明で規制する範囲内である。その結果、しごき成形性、ネック成形性、トリミング性、ネジ成形性および座屈荷重の全てが「○（良好）」であり、ボトル缶の成形時に要求される特性が充分に満たされているという結果が得られた。 As shown in Tables 3 and 4, in Example 8, Si, Fe, Mn, Mg, and Cu contents, (Fe content + 1.07 × Mn content), (Mn content + Mg content), ear ratio , Plate thickness and 0.2% proof stress are all within the range regulated by the present invention. As a result, ironing formability, neck formability, trimming property, screw formability, and buckling load were all “good”, indicating that the properties required for forming bottle cans were sufficiently satisfied. The result was obtained.
また、実施例９、１０は（Ｆｅ含有量＋１．０７×Ｍｎ含有量）が本発明の請求項２で規制する範囲から外れ、実施例１１は（Ｆｅ含有量＋１．０７×Ｍｎ含有量）および（Ｍｎ含有量＋Ｍｇ含有量）が本発明の請求項２で規制する範囲から外れる。しかしながら、しごき成形性、ネック成形性、トリミング性、ネジ成形性が「○（良好）」または「△（概ね良好）」、座屈荷重が充分であり、ボトル缶の成形時に要求される特性が満たされているという結果が得られた。
In Examples 9 and 10, (Fe content + 1.07 × Mn content) is out of the range regulated by
１ ボトル缶（２ピースボトル缶）
２、２０ 胴体部
３、３０ ネック部
４、４０ 口部
５、５０ ネジ部
６、６０ 底部
１０ ボトル缶（３ピースボトル缶）
Ｄ1、Ｄ10 胴体部の直径
Ｄ2、Ｄ20 口部の直径
1 bottle can (2 piece bottle can)
2,20
D 1 , D 10 Body diameter D 2 , D 20 mouth diameter
Claims (3)
前記アルミニウム合金板は、Ｆｅを０．２〜０．７質量％、Ｓｉを０．１質量％以上０．５質量％未満、Ｍｎを０．５〜１．２質量％、Ｍｇを１．２質量％を超え１．５質量％以下、Ｃｕを０．１〜０．３質量％含有し、残部がＡｌと不可避的不純物とからなる組成を有し、且つ
前記アルミニウム合金板の板厚が０．３〜０．５ｍｍ、且つ
前記アルミニウム合金板の２１０℃で１０分間保持した後の０．２％耐力が２５０〜２６５Ｎ／ｍｍ2であることを特徴とするボトル缶用アルミニウム合金板。 A body portion, a bottom portion, the bottle can which a mouth portion having a threaded portion threaded processing has been performed is formed integrally, and the diameter of the body portion of the bottle can as D 1, the diameter of the mouth Is defined as D 2 , and the drawing ratio R 1 (%) of the diameter of the mouth portion to the diameter of the body portion is expressed as R 1 = {(D 1 −D 2 ) / D 1 } × 100. 1 is an aluminum alloy plate containing Al as a main component used for a bottle can having 20% or more,
The aluminum alloy plate contains 0.2 to 0.7% by mass of Fe, 0.1 to less than 0.5% by mass of Si, 0.5 to 1.2% by mass of Mn, and 1.2% by mass of Mg. More than 1.5% by mass and not more than 1.5% by mass, containing 0.1 to 0.3% by mass of Cu, with the balance being composed of Al and unavoidable impurities, and having a thickness of 0 An aluminum alloy plate for bottle cans, characterized in that the aluminum alloy plate has a 0.2% proof stress of 250 to 265 N / mm 2 after being held at 210 ° C. for 10 minutes.
（Ｆｅ含有量＋１．０７×Ｍｎ含有量）が１．３０質量％を超え１．５５質量％未満、且つ、（Ｍｎ含有量＋Ｍｇ含有量）が１．７５質量％を超え２．３５質量％未満であることを特徴とする請求項１に記載のボトル缶用アルミニウム合金板。 In the composition of the aluminum alloy plate,
(Fe content + 1.07 × Mn content) is more than 1.30% by mass and less than 1.55% by mass, and (Mn content + Mg content) is more than 1.75% by mass and 2.35% by mass. The aluminum alloy plate for a bottle can according to claim 1, wherein the thickness is less than.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006097076A (en) * | 2004-09-29 | 2006-04-13 | Kobe Steel Ltd | Aluminum-alloy sheet for bottle can, and its manufacturing method |
| JP2007246998A (en) * | 2006-03-16 | 2007-09-27 | Kobe Steel Ltd | Aluminum alloy sheet for bottle can, and method for manufacturing the same |
| EP1944384A1 (en) * | 2005-11-02 | 2008-07-16 | Kabushiki Kaisha Kobe Seiko Sho | Cold-rolled aluminum alloy sheet for bottle can with excellent neck part formability and process for producing the cold-rolled aluminum alloy sheet |
| JP2011084775A (en) * | 2009-10-15 | 2011-04-28 | Mitsubishi Alum Co Ltd | Aluminum alloy sheet for can barrel having excellent redraw formability, and method for producing the same |
| JP2011208283A (en) * | 2011-05-30 | 2011-10-20 | Kobe Steel Ltd | Aluminum alloy sheet for bottle can |
| JP6405014B1 (en) * | 2017-09-20 | 2018-10-17 | 株式会社Uacj | Aluminum alloy plate for bottle can body and manufacturing method thereof |
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| JP2002256366A (en) * | 2001-02-27 | 2002-09-11 | Kobe Steel Ltd | Aluminum sheet for bottle |
| JP2003082429A (en) * | 2001-09-11 | 2003-03-19 | Kobe Steel Ltd | Aluminum alloy sheet for bottle can |
| JP2004010941A (en) * | 2002-06-05 | 2004-01-15 | Mitsubishi Alum Co Ltd | Aluminum alloy sheet for bottle-type beverage can |
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2004
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002256366A (en) * | 2001-02-27 | 2002-09-11 | Kobe Steel Ltd | Aluminum sheet for bottle |
| JP2003082429A (en) * | 2001-09-11 | 2003-03-19 | Kobe Steel Ltd | Aluminum alloy sheet for bottle can |
| JP2004010941A (en) * | 2002-06-05 | 2004-01-15 | Mitsubishi Alum Co Ltd | Aluminum alloy sheet for bottle-type beverage can |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006097076A (en) * | 2004-09-29 | 2006-04-13 | Kobe Steel Ltd | Aluminum-alloy sheet for bottle can, and its manufacturing method |
| EP1944384A1 (en) * | 2005-11-02 | 2008-07-16 | Kabushiki Kaisha Kobe Seiko Sho | Cold-rolled aluminum alloy sheet for bottle can with excellent neck part formability and process for producing the cold-rolled aluminum alloy sheet |
| EP1944384A4 (en) * | 2005-11-02 | 2009-10-28 | Kobe Steel Ltd | Cold-rolled aluminum alloy sheet for bottle can with excellent neck part formability and process for producing the cold-rolled aluminum alloy sheet |
| JP2007246998A (en) * | 2006-03-16 | 2007-09-27 | Kobe Steel Ltd | Aluminum alloy sheet for bottle can, and method for manufacturing the same |
| JP2011084775A (en) * | 2009-10-15 | 2011-04-28 | Mitsubishi Alum Co Ltd | Aluminum alloy sheet for can barrel having excellent redraw formability, and method for producing the same |
| JP2011208283A (en) * | 2011-05-30 | 2011-10-20 | Kobe Steel Ltd | Aluminum alloy sheet for bottle can |
| JP6405014B1 (en) * | 2017-09-20 | 2018-10-17 | 株式会社Uacj | Aluminum alloy plate for bottle can body and manufacturing method thereof |
| WO2019058935A1 (en) * | 2017-09-20 | 2019-03-28 | 株式会社Uacj | Aluminum alloy plate for bottle-shaped can body and manufacturing method thereof |
| JP2019056134A (en) * | 2017-09-20 | 2019-04-11 | 株式会社Uacj | Aluminum alloy sheet for bottle can shell and method of producing the same |
| KR20190135524A (en) | 2017-09-20 | 2019-12-06 | 가부시키가이샤 유에이씨제이 | Aluminum alloy plate for bottle can body and manufacturing method |
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