JP5247996B2 - Aluminum alloy plate for can body excellent in circulation pinhole resistance and method for producing can body excellent in distribution pinhole resistance - Google Patents
Aluminum alloy plate for can body excellent in circulation pinhole resistance and method for producing can body excellent in distribution pinhole resistance Download PDFInfo
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- JP5247996B2 JP5247996B2 JP2006212418A JP2006212418A JP5247996B2 JP 5247996 B2 JP5247996 B2 JP 5247996B2 JP 2006212418 A JP2006212418 A JP 2006212418A JP 2006212418 A JP2006212418 A JP 2006212418A JP 5247996 B2 JP5247996 B2 JP 5247996B2
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Description
本発明は、耐流通ピンホール性に優れる缶ボディ用アルミニウム合金板および耐流通ピンホール性に優れる缶ボディの製造方法に関する。 The present invention relates to an aluminum alloy plate for a can body that is excellent in resistance to distribution pinholes and a method for producing a can body that is excellent in resistance to distribution pinholes .
一般に缶ボディとしては、その開口端部に缶蓋が巻締められる缶や、開口端部にキャップが螺着されるボトル缶等があり、飲料等の内容物が充填、密封され、市場において流通している。このような缶ボディは、従来、ＪＩＳ３００４（ＡＡ３００４）またはＪＩＳ３１０４（ＡＡ３１０４）のＡｌ合金からなる板材に絞り加工およびしごき加工を施すことによって行われるＤＩ加工で形成されている。このようなしごき加工は、通常３回に分けて行われることにより、缶ボディが製缶される。
そして、その胴部は、最薄部における肉厚が約０．１０６ｍｍとされ、引張強さと０．２％耐力との差が２７ＭＰａ以下とされる。
In general, the can body includes a can with a can lid wound around its open end and a bottle can with a cap screwed into its open end, filled with beverages and other contents, and distributed in the market. doing. Such a can body is conventionally formed by DI processing performed by drawing and ironing a plate material made of an Al alloy of JIS3004 (AA3004) or JIS3104 (AA3104). Such a ironing process is usually performed in three times to produce a can body.
And the thickness of the trunk | drum is about 0.106 mm in the thinnest part, and the difference of tensile strength and 0.2% yield strength shall be 27 Mpa or less.
従来、上述のような缶ボディの流通過程において、例えば、缶ボディの胴部に先鋭体が接触又は衝突したり、あるいは隣接した缶ボディの胴部同士が衝突したり、缶と缶の間に異物が挟まった状態で擦れること等により、流通ピンホールと呼ばれる微小な孔等の破断
が発生し、その内容物が漏洩する等の問題があった。
Conventionally, in the distribution process of the can body as described above, for example, the sharp body contacts or collides with the body portion of the can body, the body portions of adjacent can bodies collide, or between the cans and the cans. Due to rubbing in a state where foreign matter is sandwiched, there is a problem that breakage of a minute hole or the like called a distribution pinhole occurs and the contents leak.
上述のようなピンホールが生じる問題を解決するための有効な手段として、胴部の肉厚を大きくすることが考えられるものの、この場合、缶ボディ材の量も増大するので、製造コストが増大するのを回避できなかった。 Although it is conceivable to increase the thickness of the barrel as an effective means for solving the above-described problem of pinholes, in this case, the amount of can body material also increases, which increases the manufacturing cost. I couldn't avoid it.
このような問題を解決するため、例えば、Ｍｎ：０．８〜１．５％及びＭｇ：０．８〜１．３％を質量％で含有したアルミニウム合金材からなり、破断伸びが６〜１０％とされた缶ボディが提案されている（例えば、特許文献１）。
特許文献１に記載の缶ボディでは、缶ボディ材の成分組成を上述としたうえで、製缶後の破断伸びを６〜１０％として構成することにより、素材の板厚を薄くした場合であっても、胴部の突き刺し強度が向上するとされている。 In the can body described in Patent Document 1, the component composition of the can body material is set as described above, and the elongation at break after canning is configured to be 6 to 10%, thereby reducing the thickness of the material. However, it is said that the piercing strength of the trunk portion is improved.
しかしながら、特許文献１に記載の缶ボディ材の構成では、素材の板厚を薄くした場合に底部も薄くなり、底部の耐圧強度が低下する虞がある。このため、素材自体の強度を高くする必要があるが、素材の強度を高くすると、しごき加工による成形時に胴部の破断（胴切れ）が生じ易くなるという問題がある。
このような胴切れを防止するためには、１回のしごき加工でのしごき率を低くするために、しごき加工の回数を増やすことが有効であるが、上述したように、従来から用いられているＤＩ加工方法においては、しごきが通常３回で行われており、しごき回数を増やす場合には従来の工程設備を使用することができないという問題があった。
However, in the configuration of the can body material described in Patent Document 1, when the plate thickness of the material is reduced, the bottom portion is also thinned, and the pressure strength of the bottom portion may be reduced. For this reason, it is necessary to increase the strength of the raw material itself. However, if the strength of the raw material is increased, there is a problem in that the body portion is likely to be broken (cut out) during molding by ironing.
In order to prevent such a barrel cut, it is effective to increase the number of ironing processes in order to reduce the ironing rate in one ironing process. However, as described above, it has been conventionally used. In the conventional DI processing method, ironing is usually performed three times, and there is a problem that conventional process equipment cannot be used when the number of times of ironing is increased.
本発明は上記事情に鑑みてなされたものであり、製造コストを増大させることなくピンホールの発生を防ぐことができる、耐流通ピンホール性に優れる缶ボディ材を提供すること、および耐流通ピンホール性に優れる缶ボディの製造方法の提供を目的とする。 The present invention has been made in view of the above circumstances, and can provide a can body material that can prevent the occurrence of pinholes without increasing the manufacturing cost and has excellent distribution pinhole resistance, and distribution resistance pins. It aims at providing the manufacturing method of the can body which is excellent in hall | hole property .
本発明は、以下に関する。
（１）請求項１に記載の発明
胴部の厚さが０．１１０ｍｍ超０．１２５ｍｍ以下であり、所定ブランク径Ｄ１の円板状の板材から絞り加工により所定カップ径Ｄ２の第一のカップ状缶体を形成し、再絞り加工により所定胴部径Ｄ３の第二のカップ状缶体を形成する場合においてＤ１／Ｄ３で示される総絞り比が２．０〜２．７であり、且つ、前記第二のカップ状缶体をしごき加工により最終缶ボディとする際、前記円板状の板材の板厚をＴ１、最終缶ボディ胴部最薄部厚さをＴ２とした場合、（Ｔ１−Ｔ２）／Ｔ１×１００（％）で示される総しごき率が５０％以上６０％未満の缶ボディの製造に用いる缶ボディ用アルミニウム合金板であって、質量％で、Ｓｉ：０．１５〜０．５％、Ｆｅ：０．３〜０．６％、Ｃｕ：０．１５〜０．５％、Ｍｎ：０．７〜１．２％、Ｍｇ：０．８〜２．０％を含有し、残部が不可避不純物を含むＡｌからなり、前記円板状の板材の板厚が０．２５０ｍｍ以上０．２７５ｍｍ未満であり、ベーキング後の素材耐力が２６５ＭＰａ以上であり、ベーキング後の素材の引張強さと耐力の差が２８ＭＰａ以上であり、ＤＩ加工及び塗装焼付けによる製缶後の缶ボディの胴部の引張強さが３３０ＭＰａ超３８０ＭＰａ以下であるとともに、前記胴部の伸びが４％以上であることを特徴とする、耐流通ピンホール性に優れる缶ボディ用アルミニウム合金板。
（２）請求項２に記載の発明
さらに、質量％でＺｎ：０．０５〜０．３０％、Ｔｉ：０．０５〜０．１５％の内の１種又は２種を含有することを特徴とする請求項１に記載の耐流通ピンホール性に優れる缶ボディ用アルミニウム合金板。
（３）請求項３に記載の発明
質量％で、Ｓｉ：０．１５〜０．５％、Ｆｅ：０．３〜０．６％、Ｃｕ：０．１５〜０．５％、Ｍｎ：０．７〜１．２％、Ｍｇ：０．８〜２．０％を含有し、残部が不可避不純物を含むＡｌからなるアルミニウム合金からなり、ベーキング後の素材耐力が２６５ＭＰａ以上であり、ベーキング後の素材の引張強さと耐力の差が２８ＭＰａ以上であるアルミニウム合金板を絞り加工してカップ状缶体を形成し、カップ状缶体をしごき加工して缶ボディを形成する耐流通ピンホール性に優れる缶ボディの製造方法であり、板厚が０．２５０ｍｍ以上０．２７５ｍｍ未満であり、前記アルミニウム合金板からなる所定ブランク径Ｄ１の円板状の板材から絞り加工により所定カップ径Ｄ２の第一のカップ状缶体を形成し、再絞り加工により所定胴部径Ｄ３の第二のカップ状缶体を形成する場合においてＤ１／Ｄ３で示される総絞り比を２．０〜２．７とし、且つ、前記第二のカップ状缶体をしごき加工により最終缶ボディとする際、前記円板状の板材の板厚をＴ１、最終缶ボディ胴部最薄部厚さをＴ２とした場合、（Ｔ１−Ｔ２）／Ｔ１×１００（％）で示される総しごき率を５０％以上６０％未満として胴部の厚さが０．１１０ｍｍ超０．１２５ｍｍ以下であり、ＤＩ加工及び塗装焼付けによる製缶後の缶ボディの胴部の引張強さが３３０ＭＰａ超３８０ＭＰａ以下であり、前記胴部の伸びが４％以上である缶ボディを製造することを特徴とする耐流通ピンホール性に優れる缶ボディの製造方法。
（４）請求項４に記載の発明
さらに、質量％でＺｎ：０．０５〜０．３０％、Ｔｉ：０．０５〜０．１５％の内の１種又は２種を含有するアルミニウム合金を用いることを特徴とする請求項３に記載の耐流通ピンホール性に優れる缶ボディの製造方法。
The present invention relates to the following.
(1) Invention of Claim 1 The thickness of a trunk | drum is 0.110 mm or more and 0.125 mm or less, and the 1st cup of predetermined cup diameter D2 by drawing from the disk-shaped board | plate material of predetermined blank diameter D1. And when the second cup-shaped can body having a predetermined body diameter D3 is formed by redrawing, the total drawing ratio indicated by D1 / D3 is 2.0 to 2.7, and When the second cup-shaped can body is made into a final can body by ironing, when the plate thickness of the disk-shaped plate material is T1, and the final can body body thinnest part thickness is T2, (T1 -T2) An aluminum alloy plate for a can body used for manufacturing a can body having a total ironing ratio represented by T1 × 100 (%) of 50% or more and less than 60%, and Si: 0.15 in mass%. 0.5%, Fe: 0.3-0.6%, Cu: 0.15-0.5%, n: 0.7 to 1.2% Mg: contains 0.8 to 2.0%, the balance being Al contain inevitable impurities, the thickness of the disc-shaped plate member is more than 0.250 mm 0 Less than 275 mm, the material strength after baking is 265 MPa or more, the difference between the tensile strength and the strength of the material after baking is 28 MPa or more, and the body part of the can body after can making by DI processing and paint baking An aluminum alloy plate for a can body having excellent flow-through pinhole resistance, characterized by having a tensile strength of more than 330 MPa and not more than 380 MPa and an elongation of the body portion of 4% or more.
(2) Invention of Claim 2 Furthermore, it contains 1 type or 2 types in Zn: 0.05-0.30% and Ti: 0.05-0.15% by the mass%, It is characterized by the above-mentioned. The aluminum alloy plate for can bodies having excellent flow-resistant pinhole properties according to claim 1.
(3) The invention according to claim 3
In mass%, Si: 0.15-0.5%, Fe: 0.3-0.6%, Cu: 0.15-0.5%, Mn: 0.7-1.2%, Mg: It is made of an aluminum alloy composed of Al containing 0.8 to 2.0% and the balance containing inevitable impurities, the material yield strength after baking is 265 MPa or more, and the difference between the tensile strength and the yield strength of the material after baking is 28 MPa. This is a method for producing a can body excellent in flow-resistant pinhole resistance, in which the aluminum alloy plate is drawn to form a cup-shaped can body, and the cup-shaped can body is ironed to form a can body. The first cup-shaped can body having a predetermined cup diameter D2 is formed by drawing from a disk-shaped plate material having a predetermined blank diameter D1 made of the aluminum alloy plate, and redrawed from 0.250 mm to less than 0.275 mm. Predetermined body diameter by processing 3 when the second cup-shaped can body is formed, the total drawing ratio indicated by D1 / D3 is set to 2.0 to 2.7, and the second can-shaped can body is subjected to ironing to obtain a final can body. When the thickness of the disk-shaped plate material is T1, and the final can body body thinnest thickness is T2, the total ironing ratio represented by (T1-T2) / T1 × 100 (%) 50% or more and less than 60%, the thickness of the barrel is more than 0.110 mm and less than 0.125 mm, and the tensile strength of the barrel of the can body after can manufacturing by DI processing and paint baking is more than 330 MPa and less than 380 MPa A method for producing a can body having excellent circulation pinhole resistance, characterized in that a can body having an elongation of 4% or more is produced.
(4) Invention of Claim 4
Further, an aluminum alloy containing one or two of Zn: 0.05 to 0.30% and Ti: 0.05 to 0.15% by mass% is used. The manufacturing method of the can body excellent in circulation pinhole property of description.
缶ボディの耐流通ピンホール性を向上させるためには、缶ボディの胴部の板厚を厚くすることが最も効果的である。一方、胴部の板厚を厚くすると、製缶に必要な缶ボディ材の必要量も増大するため、経済的でなくなる。
そこで、缶ボディの底部を薄く形成することにより、必要な缶ボディ材の量を少なくする必要がある。缶ボディの底部は、しごき成形されないため、底部を薄くするためには素材板厚を薄くする必要がある。また、底部が薄くなると該底部の耐圧強度が低下するため、素材自体の強度を高める必要がある。しかしながら、素材の強度を高くすると、しごき成形時に胴部の破断（胴切れ）が生じ易くなる。
本発明者らが鋭意検討した結果、素材の板厚を薄く形成し、且つ製缶された缶ボディ胴部の板厚を厚く形成することにより、総しごき率を低くすることができ、胴切れが生じにくくなることから、素材強度を高くしても、胴切れが発生するのを従来と同レベルに抑制できることを知見した。また、素材強度を高くすることにより、製缶後の缶ボディ胴部の強度も高くできるので、よりピンホールを生じにくくなることを見出し、本発明を完成した。
In order to improve the distribution pinhole resistance of the can body, it is most effective to increase the thickness of the body portion of the can body. On the other hand, when the plate thickness of the body portion is increased, the necessary amount of can body material necessary for can making increases, which is not economical.
Therefore, it is necessary to reduce the amount of can body material required by forming the bottom of the can body thin. Since the bottom of the can body is not ironed, it is necessary to reduce the material plate thickness in order to make the bottom thinner. Moreover, since the pressure resistance strength of the bottom portion decreases when the bottom portion becomes thin, it is necessary to increase the strength of the material itself. However, when the strength of the material is increased, the body portion is likely to be broken (runout) during ironing.
As a result of intensive studies by the present inventors, it is possible to reduce the total ironing rate by forming a thin plate thickness of the raw material and forming a thick plate body of the can body body, Therefore, it has been found that even if the material strength is increased, it is possible to suppress the occurrence of torsion to the same level as before. In addition, by increasing the strength of the material, the strength of the can body body after canning can be increased, and it has been found that pinholes are less likely to occur, and the present invention has been completed.
本発明の耐流通ピンホール性に優れる缶ボディ用アルミニウム合金板は、上述の組成のアルミニウム合金からなり、上述の構成とすることにより、素材板厚を０．２５０ｍｍ以上０．２７５ｍｍ未満と薄くし、且つ胴部板厚を０．１１０ｍｍ超０．１２５ｍｍ以下と厚くしているので、ＤＩ加工による製缶の際の総絞り比を２．０〜２．７の範囲に、総しごき率を５０％以上６０％未満に小さくすることができる。
総しごき率が低くなると、胴部切れが生じにくくなるので、ベーキング後の素材耐力を２６５ＭＰａ以上、ベーキング後の素材の引張強さと耐力の差を２８ＭＰａ以上として従来よりも素材強度を高くした場合であっても、胴部切れが発生するのを抑制することが可能となる。また、素材強度を高くすることにより、ＤＩ加工及び塗装焼付けによる製缶後の缶ボディの胴部の引張強さを３３０ＭＰａ超３８０ＭＰａ以下と高くできるので、よりピンホールを生じにくくなり、焼付けによる加熱により胴部の伸びを４％以上にできる。
従って、本発明の缶ボディ用アルミニウム合金板を用いることにより、製造コストを増大させることなく、耐流通ピンホール性に優れた缶ボディを得ることができる。
The aluminum alloy plate for can bodies having excellent anti-pinhole resistance of the present invention is made of an aluminum alloy having the above-mentioned composition. By adopting the above-described configuration, the thickness of the material plate is reduced to 0.250 mm or more and less than 0.275 mm. In addition, since the body plate thickness is increased to more than 0.110 mm and less than 0.125 mm , the total drawing ratio in the case of can manufacturing by DI processing is in the range of 2.0 to 2.7, and the total ironing rate is 50. % To less than 60% .
When the total ironing ratio is low, the body part is less likely to be cut. Therefore, the material strength after baking is 265 MPa or more, and the difference in tensile strength and proof strength of the material after baking is 28 MPa or more. Even if it exists, it becomes possible to suppress that a torso part cut | disconnect occurs. Further, by increasing the material strength, since the tensile strength of the barrel portion of the can body after forming a can by DI processing and baking can be increased more than 330MPa ultra 380 MPa, Ri of less likely to occur more pinholes, by baking Ru can elongation of the body portion 4% or more by heating.
Therefore, by using the aluminum alloy plate for a can body of the present invention, a can body excellent in circulation pinhole resistance can be obtained without increasing the production cost.
以下、本発明に係る耐流通ピンホール性に優れる缶ボディ用アルミニウム合金板（以下、缶ボディ用アルミニウム合金板と略称することがある）の実施の形態について説明する。
本実施形態の缶ボディ用アルミニウム合金板は、質量％で、Ｓｉ：０．１５〜０．５％、Ｆｅ：０．３〜０．６％、Ｃｕ：０．１５〜０．５％、Ｍｎ：０．７〜１．２％、Ｍｇ：０．８〜２．０％（好ましくは１．５％未満）を含有し、残部が不可避不純物を含むＡｌからなり、板厚が０．２５０以上０．２７５ｍｍ未満であり、ベーキング後の素材の引張強さと耐力との差が２８ＭＰａ以上である缶ボディ用アルミニウム合金板であって、ＤＩ加工及び塗装焼付けによる製缶後の缶ボディの胴部の引張強さが３３０ＭＰａ超３８０ＭＰａ以下（好ましくは３４０ＭＰａ超）であるとともに、前記胴部の伸びが４％以上として概略構成されている。
本実施形態の缶ボディ用アルミニウム合金板は、胴部の厚さが０．１１０ｍｍ超０．１２５ｍｍ以下であり、製造時の総絞り比が２．０〜２．７であり、且つ総しごき率が５０％以上６０％未満の缶ボディの製造に用いるのに適する。
Hereinafter, embodiments of an aluminum alloy plate for a can body (hereinafter, may be abbreviated as an aluminum alloy plate for a can body) having excellent flow-resistant pinhole properties according to the present invention will be described.
The aluminum alloy plate for a can body of the present embodiment is in mass%, Si: 0.15 to 0.5%, Fe: 0.3 to 0.6%, Cu: 0.15 to 0.5%, Mn : 0.7-1.2%, Mg: 0.8-2.0% (preferably less than 1.5%), the balance is made of Al containing inevitable impurities, and the plate thickness is 0.250 or more An aluminum alloy plate for a can body having a difference between the tensile strength and the yield strength of the material after baking of 28 MPa or more, which is less than 0.275 mm, and which is formed on the body of the can body after canning by DI processing and paint baking. The tensile strength is more than 330 MPa and less than 380 MPa (preferably more than 340 MPa), and the elongation of the body portion is roughly configured to be 4% or more.
The aluminum alloy plate for a can body of the present embodiment has a body thickness of more than 0.110 mm and not more than 0.125 mm, a total drawing ratio at the time of manufacture of 2.0 to 2.7, and a total ironing rate Is suitable for use in the production of can bodies having a ratio of 50% to less than 60%.
また、本発明の缶ボディ用アルミニウム合金板は、アルミニウム鋳塊に対して５６０℃〜融点未満の温度範囲で均質化処理を施した後、熱間圧延を行うか、あるいは、更に冷間圧延、および／または、中間焼鈍を施すことによって所定板厚に形成された後、最終圧下率４５％〜８５％の冷間仕上げ圧延を施すことにより、素材としての最終板厚（０．２５０ｍｍ以上０．２７５ｍｍ未満）に形成される。 In addition, the aluminum alloy plate for a can body of the present invention is subjected to homogenization treatment in a temperature range of 560 ° C. to less than the melting point for the aluminum ingot, and then hot-rolled, or further cold-rolled, And / or after having formed into predetermined sheet thickness by performing intermediate annealing, the final sheet thickness (0.250 mm or more and 0.2. Less than 275 mm).
［成分組成］
以下、本発明の缶ボディ用アルミニウム合金板において限定する成分組成について説明する。
なお、以下に記載する各元素の含有量は、特に規定しない限り質量％であり、また、特に規定しない限り上限と下限を含むものとする。従って、例えば０.１５〜０.５％は、０.１５％以上、０.５％以下を意味する。
[Ingredient composition]
Hereinafter, the component composition limited in the aluminum alloy plate for can bodies of this invention is demonstrated.
In addition, content of each element described below is mass% unless otherwise specified, and includes an upper limit and a lower limit unless otherwise specified. Therefore, for example, 0.15 to 0.5% means 0.15% or more and 0.5% or less.
「Ｓｉ」０.１５〜０.５％
Ｓｉは、本発明の缶ボディ用アルミニウム合金板において、同時に含有されるＭｇ等とともに化合物を形成し、固溶硬化、析出硬化及び分散硬化作用で強度を向上させる他、Ａｌ−Ｍｎ−Ｆｅ系金属間化合物を形成して、しごき成型時にダイスに対する焼き付きを防止する効果を有する。
Ｓｉの含有量が０．１５％未満だと、十分な強度が得られず、また、金属間化合物寸法が大きくなる。また、所望の潤滑性能を発揮できず、ダイス（金型）への焼き付きを防止するのに不充分となる。
Ｓｉの含有量が０.５％を越えると、強度が高くなりすぎ、缶ボディとして製缶した際に胴切れが生じ易くなり、加工性が劣化する。
また、Ｍｇ、Ｃｕ、Ａｌとの金属間化合物が溶体化できなくなり、靭性が低下し、ピンホールが生じやすくなる。
従って、Ｓｉの含有量は、０．１５〜０．５％の範囲内とすることが好ましい。
"Si" 0.15-0.5%
In the aluminum alloy plate for can bodies of the present invention, Si forms a compound together with Mg or the like contained at the same time, and improves the strength by solid solution hardening, precipitation hardening and dispersion hardening, and Al-Mn-Fe based metal An intermetallic compound is formed, and has the effect of preventing seizure on the die during ironing molding.
If the Si content is less than 0.15%, sufficient strength cannot be obtained, and the intermetallic compound size increases. Further, the desired lubrication performance cannot be exhibited, which is insufficient to prevent seizure on the die (die).
If the Si content exceeds 0.5%, the strength becomes too high, and when a can body is produced as a can body, it becomes easy to be cut out of the cylinder and the workability deteriorates.
Moreover, the intermetallic compound with Mg, Cu, and Al cannot be solutionized, the toughness is lowered, and pinholes are easily generated.
Therefore, the Si content is preferably in the range of 0.15 to 0.5%.
「Ｆｅ」０.３〜０.６％
Ｆｅは、本発明の缶ボディ用アルミニウム合金板において、Ａｌ−Ｍｎ−Ｆｅ系金属間化合物の析出量を増加させ、結晶の微細化と、しごき成形加工時にダイスに対して焼き付きが生じるのを防止する効果を有する。
Ｆｅの含有量が０.３％未満だと、Ａｌ−Ｍｎ−Ｆｅ系金属間化合物の析出量が少なくなりすぎ、しごき金型への焼き付が生じやすくなる。
Ｆｅの含有量が０.６％を超えると、Ａｌ−Ｍｎ−Ｆｅ系金属間化合物の量が多くなりすぎ、靭性低下によって加工性が劣化し、ピンホールが生じやすくなる。
従って、Ｆｅの含有量は、０．３〜０．６％の範囲内とすることが好ましい。
"Fe" 0.3-0.6%
Fe increases the precipitation amount of Al-Mn-Fe intermetallic compounds in the aluminum alloy sheet for can bodies of the present invention, and prevents the formation of fine crystals and seizure to the die during ironing processing. Has the effect of
If the Fe content is less than 0.3%, the amount of Al-Mn-Fe-based intermetallic compound deposited becomes too small, and seizure to the ironing mold tends to occur.
If the Fe content exceeds 0.6%, the amount of Al—Mn—Fe intermetallic compound becomes too large, and the workability deteriorates due to a decrease in toughness, and pinholes are likely to occur.
Therefore, the Fe content is preferably in the range of 0.3 to 0.6%.
「Ｃｕ」０.１５〜０.５％
Ｃｕは、本発明の缶ボディ用アルミニウム合金板において、Ｍｇ等と金属間化合物を形成し、固溶硬化、析出硬化及び分散硬化作用で強度を高める効果を有する。
Ｃｕの含有量が０.１５％未満だと、充分な強度向上効果が得られない。
Ｃｕの含有量が０.５％を越えると、強度が高くなりすぎ、缶ボディとして製缶した際に胴切れが生じ易くなる。また、Ｍｇ、Ｓｉ、Ａｌとの金属間化合物が溶体化できなくなり、靭性低下によって加工性が劣化し、ピンホールが生じやすくなる。
従って、Ｃｕの含有量は、０．１５〜０．５％の範囲内とすることが好ましい。
"Cu" 0.15-0.5%
Cu forms an intermetallic compound with Mg or the like in the aluminum alloy plate for a can body of the present invention, and has an effect of increasing strength by solid solution hardening, precipitation hardening, and dispersion hardening.
If the Cu content is less than 0.15%, a sufficient strength improvement effect cannot be obtained.
If the Cu content exceeds 0.5%, the strength becomes too high, and when the can body is produced as a can body, it becomes easy for the barrel to be cut. In addition, the intermetallic compound with Mg, Si, and Al cannot be in solution, and the workability deteriorates due to a decrease in toughness, and pinholes are likely to occur.
Therefore, the Cu content is preferably in the range of 0.15 to 0.5%.
「Ｍｎ」０.７〜１.２％
Ｍｎは、本発明の缶ボディ用アルミニウム合金板において、Ａｌ−Ｍｎ−Ｆｅ系金属間化合物を形成し、晶出相及び分散相となって分散硬化作用を発揮するとともに、しごき成型加工時にダイスに対して焼き付きが生じるのを防止する効果を有する。
Ｍｎの含有量が０.７％未満だと、Ａｌ−Ｍｎ−Ｆｅ系金属間化合物の量が少なくなりすぎて充分な硬化特性が得られず、しごき金型への焼き付が生じやすくなる。
Ｍｎの含有量が１.２％を越えると、Ａｌ−Ｍｎ−Ｆｅ系金属間化合物の量が多くなりすぎ、靭性低下によって加工性が劣化し、ピンホールが生じやすくなる。
従って、Ｍｎの含有量は、０.７〜１.２％の範囲内とすることが好ましく、１．０％以下とすることがより好ましい。
"Mn" 0.7-1.2%
In the aluminum alloy plate for can bodies of the present invention, Mn forms an Al-Mn-Fe intermetallic compound, becomes a crystallization phase and a dispersed phase, exhibits a dispersion hardening action, and is used as a die during ironing molding processing. On the other hand, it has the effect of preventing seizure.
When the content of Mn is less than 0.7%, the amount of Al—Mn—Fe intermetallic compound becomes too small to obtain sufficient curing characteristics, and seizure to the ironing mold tends to occur.
When the content of Mn exceeds 1.2%, the amount of Al—Mn—Fe intermetallic compound is excessively increased, workability is deteriorated due to a decrease in toughness, and pinholes are easily generated.
Therefore, the Mn content is preferably in the range of 0.7 to 1.2%, more preferably 1.0% or less.
「Ｍｇ」０．８〜２．０％（好ましくは、１．５％未満）
Ｍｇは、本発明の缶ボディ用アルミニウム合金板において、固溶体強化作用を有し、圧延加工時に加工硬化性を高めるとともに、ＳｉやＣｕと共存することで分散硬化と析出硬化作用を発揮し、強度を向上させる。
Ｍｇの含有量が０．８％未満だと、上述した充分な効果が得られない。
Ｍｇの含有量が２．０％を超えると、強度が高くなりすぎて加工性、特にカール加工性が劣化し、缶ボディとして製缶した際に胴切れが生じ易くなる。
従って、Ｍｇの含有量は、０．８〜２．０％の範囲内とすることがより好ましく、１．５％未満とすることがより好ましい。
"Mg" 0.8-2.0% (preferably less than 1.5%)
In the aluminum alloy plate for can bodies of the present invention, Mg has a solid solution strengthening action, enhances work hardening at the time of rolling, and exhibits dispersion hardening and precipitation hardening action by coexisting with Si and Cu. To improve.
If the Mg content is less than 0.8%, the above-described sufficient effect cannot be obtained.
If the Mg content exceeds 2.0%, the strength becomes too high, and the workability, particularly curl workability, is deteriorated, and when the can body is produced as a can body, it becomes easy to cause a barrel break.
Therefore, the Mg content is more preferably in the range of 0.8 to 2.0%, and more preferably less than 1.5%.
「Ｚｎ及びＴｉ」Ｚｎ：０．０５〜０．３０％、Ｔｉ０．０５〜０．１５％
本発明の缶ボディ用アルミニウム合金板は、さらに必要に応じて、質量％でＺｎ：０．０５〜０．３０％、Ｔｉ：０．０５〜０．１５％の内の１種又は２種を含有する成分組成とすることができる。
Ｚｎは、析出するＭｇ、Ｓｉ、Ｃｕの金属間化合物を微細化する作用を有する。
Ｚｎの含有量が０．０５％未満だと、上述した充分な効果が得られない。
Ｚｎの含有量が０．３０％を越えると、加工性と耐食性が劣化する。
従って、Ｚｎの含有量は、０．０５〜０．３０％の範囲内とすることが好ましい。
“Zn and Ti” Zn: 0.05 to 0.30%, Ti 0.05 to 0.15%
The aluminum alloy plate for a can body according to the present invention may further include one or two of Zn: 0.05 to 0.30% and Ti: 0.05 to 0.15% by mass as necessary. It can be set as the component composition to contain.
Zn has the effect | action which refines | miniaturizes the intermetallic compound of Mg, Si, and Cu to precipitate.
If the Zn content is less than 0.05%, the above-described sufficient effect cannot be obtained.
If the Zn content exceeds 0.30%, workability and corrosion resistance deteriorate.
Therefore, the Zn content is preferably in the range of 0.05 to 0.30%.
Ｔｉは、本発明の缶ボディ用アルミニウム合金板において、結晶粒を微細化し、加工性を改善する効果を有する。
Ｔｉの含有量が０．０５％未満だと、上述した充分な効果が得られない。
Ｔｉの含有量が０．１５％を越えると、粗大な化合物が生じて加工性が劣化する。
従って、Ｔｉの含有量は、０．０５〜０．１５％の範囲内とすることが好ましい。
Ti has the effect of refining crystal grains and improving workability in the aluminum alloy plate for can bodies of the present invention.
When the Ti content is less than 0.05%, the above-described sufficient effect cannot be obtained.
If the Ti content exceeds 0.15%, a coarse compound is produced and the workability is deteriorated.
Therefore, the Ti content is preferably in the range of 0.05 to 0.15%.
［缶ボディ用アルミニウム合金板の板厚］
本発明の缶ボディ用アルミニウム合金板の板厚は、０．２５０ｍｍ以上０．２７５ｍｍ未満の範囲であることが好ましい。
板厚が０．２５０ｍｍ未満だと、製缶して缶ボディとした際の十分な耐圧強度が得られなくなる。
また、板厚が０．２７５ｍｍ以上だと、缶ボディの底部の重量が重くなり、製造コストが上昇して経済的でない。
[Thickness of aluminum alloy sheet for can body]
It is preferable that the plate | board thickness of the aluminum alloy plate for can bodies of this invention is the range of 0.250 mm or more and less than 0.275 mm.
When the plate thickness is less than 0.250 mm, sufficient pressure resistance strength cannot be obtained when the can is made into a can body.
On the other hand, if the plate thickness is 0.275 mm or more, the weight of the bottom of the can body becomes heavy, and the manufacturing cost increases, which is not economical.
［リオイル量］
本発明の缶ボディ用アルミニウム合金板では、冷間仕上圧延後、板の表面に５０〜３００ｍｇ／ｍ２の潤滑剤をリオイル（塗油）する。リオイルには、深絞り成形の直前に塗油する潤滑剤と親和性が高い潤滑剤を用いれば良く、例えば、深絞り成形の直前に塗油する潤滑剤と同じものを用いることができる。
予め、合金板素材に潤滑剤を少量リオイルしておくことにより、深絞り成形直前に潤滑剤を塗油する際に均一に塗油されるようになり、深絞り、及び、しごき成形の際の潤滑効果が高まり、特にしごき成形時の胴切れを抑制することができる。
リオイル量は、５０〜３００ｍｇ／ｍ２の範囲であることが好ましい。この範囲であれば、上述の効果が充分に得られる。
また、リオイル量は、より好ましくは２００ｍｇ／ｍ２以下である。
[Re-oil amount]
In the aluminum alloy plate for a can body of the present invention, after cold finish rolling, 50 to 300 mg / m 2 of lubricant is reoiled (oiled) on the surface of the plate. For the reoil, a lubricant having a high affinity with the lubricant applied immediately before deep drawing may be used. For example, the same lubricant as that applied immediately before deep drawing may be used.
By pre-lubricating a small amount of lubricant on the alloy plate material in advance, it will be applied evenly when applying the lubricant immediately before deep drawing, and during deep drawing and ironing The lubrication effect is enhanced, and it is possible to suppress the cylinder breakage particularly during ironing.
The reoil amount is preferably in the range of 50 to 300 mg / m 2 . If it is this range, the above-mentioned effect is fully acquired.
The reoil amount is more preferably 200 mg / m 2 or less.
［ベーキング後の素材の引張強さと耐力の差（ベーキング：２１０℃×１０分）］
ＤＩ加工後の缶ボディは、洗浄、化成処理後の乾燥時、外面印刷または内面塗装後の焼付け処理によって１８０〜２３０℃の温度に加熱される。この加熱により、一般に、缶底部や胴部の強度が変化する。この、加熱後の強度は、ＤＩ成形時の歪量によって異なる。底部はＤＩ成形時の歪みが小さいため、その加熱後の強度はＤＩ加工前の素材であるアルミニウム合金板を加熱した後の強度とほぼ等しくなる。このため、底部の強度の目安として、素材であるアルミニウム合金板をベーキング（加熱）した後の強度を用いることができる。本発明では、このための加熱条件を、２１０℃×１０分としている。
本発明の缶ボディ用アルミニウム合金板における、ベーキング後の素材の引張強さと耐力の差（ＡＢ・ＴＳ−ＡＢ・ＹＳ）は、２８ＭＰａ以上であることが好ましく、３５ＭＰａ以上であることがより好ましい。
ベーキング後の素材耐力としては、２１０℃の温度で１０分間のベーキングを行った後の耐力で２６５ＭＰａ以上であることが好ましい。また、同様に、ベーキング後の素材の引張強さは、２９３ＭＰａ以上であることが好ましい。
上述の条件でベーキングした後の素材の引張強さと耐力の差が上述の範囲内であれば、加工硬化能が高く、製缶後の缶胴の引張強さ、延性が高くなり、ピンホールを生じにくくなる。ベーキング後の素材の引張強さと耐力の差を大きくするためには、最終冷延率を低くすれば良いが、最終冷延率を低くするとベーキング後の素材耐力も低くなるので、所定の素材耐力を得るためには、Ｍｇ、Ｃｕ、Ｓｉ等の成分を増加させることや、中間焼鈍を高温で行ない、Ｍｇ、Ｃｕ、Ｓｉを溶体化する等の方法が有効である。
[Difference between tensile strength and yield strength after baking (baking: 210 ° C x 10 minutes)]
The can body after DI processing is heated to a temperature of 180 to 230 ° C. by drying after cleaning and chemical conversion treatment, or by baking treatment after external printing or internal coating. This heating generally changes the strength of the can bottom and the trunk. The strength after heating differs depending on the amount of strain during DI molding. Since the distortion at the bottom is small during DI molding, the strength after heating is almost equal to the strength after heating the aluminum alloy plate, which is a material before DI processing. For this reason, the intensity | strength after baking (heating) the aluminum alloy plate which is a raw material can be used as a standard of the intensity | strength of a bottom part. In the present invention, the heating condition for this is 210 ° C. × 10 minutes.
In the aluminum alloy plate for can bodies of the present invention, the difference in tensile strength and proof stress (AB · TS−AB · YS) of the material after baking is preferably 28 MPa or more, and more preferably 35 MPa or more.
The material yield strength after baking is preferably 265 MPa or more as the yield strength after baking at a temperature of 210 ° C. for 10 minutes. Similarly, the tensile strength of the material after baking is preferably 293 MPa or more.
If the difference between the tensile strength and the yield strength of the material after baking under the above conditions is within the above range, the work hardening ability is high, the tensile strength and ductility of the can body after canning become high, and pinholes It becomes difficult to occur. In order to increase the difference between the tensile strength and the yield strength of the material after baking, the final cold rolling rate should be lowered. However, the lower the final cold rolling rate, the lower the material strength after baking. In order to obtain the above, methods such as increasing the components such as Mg, Cu, and Si, or performing intermediate annealing at a high temperature to form a solution of Mg, Cu, and Si are effective.
［総しごき率及び総絞り比について］
本発明の缶ボディ用アルミニウム合金板は、胴部の厚さ（最薄部厚さ）が０．１１０ｍｍ超０．１２５ｍｍ以下の缶ボディの製造に用いられる。また、本発明の缶ボディ用アルミニウム合金板は、ＤＩ加工時の総しごき率が５０％以上６０％未満の缶ボディの製造に用いる。ここで、総しごき率は、次式（４）で表される。
総しごき率（％） ＝ （元の板厚Ｔ１−最終缶ボディ胴部最薄部厚さＴ２）／元の板厚Ｔ１ × １００ ・・・（４）
上記（４）式において、最終缶ボディ胴部最薄部厚さＴ２は、塗膜無しの厚さである。
本発明の缶ボディ用アルミニウム合金板は、素材板厚が０．２５０ｍｍ以上０．２７５ｍｍ未満であり、最小のしごき率は、元板厚が０．２５０ｍｍで胴部厚さが０．１２５ｍｍである場合の５０％となる。
[About the total ironing ratio and the total drawing ratio]
The aluminum alloy plate for a can body according to the present invention is used for manufacturing a can body having a body thickness (thickest thickness) of more than 0.110 mm and not more than 0.125 mm. Moreover, the aluminum alloy plate for can bodies of the present invention is used for producing a can body having a total ironing rate during DI processing of 50% or more and less than 60%. Here, the total ironing rate is expressed by the following equation (4).
Total ironing rate (%) = (original plate thickness T1—final can body body thinnest portion thickness T2) / original plate thickness T1 × 100 (4)
In the above formula (4), the final can body trunk thinnest part thickness T2 is a thickness without a coating film.
The aluminum alloy plate for a can body of the present invention has a material plate thickness of 0.250 mm or more and less than 0.275 mm, and the minimum ironing rate is 0.250 mm for the original plate thickness and 0.125 mm for the body thickness. 50% of the case.
ここで、総しごき率を６０％以上とした場合、本発明の缶ボディ用アルミニウム合金板は素材強度が高いため、しごき成形時に胴切れが発生しやすく生産性が低下する。一方、総しごき率が５０％より低い場合とは、素材板厚が０．２５０ｍｍよりも小さい場合か、あるいは、胴部板厚が０．１２５ｍｍよりも大きい場合である。
素材板厚が０．２５０ｍｍより小さい場合、充分な耐圧強度が得られない。また、胴部板厚が０．１２５ｍｍより大きい場合、耐ピンホール性は向上するものの、実用的な見地からは過剰強度となり、必要な素材の量が増えるため、経済的でない。従って、総しごき率は５０％以上であることが必要である。
Here, when the total ironing ratio is set to 60% or more, the aluminum alloy plate for can bodies of the present invention has high material strength, so that a cylinder breakage is likely to occur during ironing forming, and productivity is lowered. On the other hand, the case where the total ironing rate is lower than 50% is the case where the material plate thickness is smaller than 0.250 mm, or the case where the body portion plate thickness is larger than 0.125 mm.
When the material plate thickness is smaller than 0.250 mm, sufficient pressure resistance cannot be obtained. Further, when the body plate thickness is larger than 0.125 mm, the pinhole resistance is improved, but from the practical viewpoint, it becomes excessive strength and the amount of necessary material increases, which is not economical. Therefore, the total ironing rate needs to be 50% or more.
また、本発明の缶ボディ用アルミニウム合金板は、ＤＩ加工時の総絞り比が２．０〜２．７である缶ボディの製造に用いられる。
総絞り比が２．７より大きいと、２回の絞り工程で絞った場合に、絞り成形時に材料の破断が生じ易くなる。一方、上記素材板厚Ｔ１、最終缶ボディ胴部最薄部厚さＴ２、及び総しごき率の制約下で実用的な容量の缶ボディを得るためには、総絞り比を２．０以上とする必要がある。例えば、一般的に用いられている缶胴径６６ｍｍで容量が３５０ｃｃの缶ボディを成形する場合には、総絞り比を２．２〜２．４とすることが好ましい。また、缶胴径約６６ｍｍで容量が約５００ｃｃの缶ボディを成形する場合には、総絞り比を２．４５〜２．６５とすることが好ましい。
Moreover, the aluminum alloy plate for can bodies of the present invention is used for manufacturing a can body having a total drawing ratio of 2.0 to 2.7 during DI processing.
If the total drawing ratio is greater than 2.7, the material is likely to break during drawing when drawn in two drawing steps. On the other hand, in order to obtain a can body having a practical capacity under the constraints of the material plate thickness T1, the final can body body thinnest part thickness T2, and the total ironing rate, the total drawing ratio is set to 2.0 or more. There is a need to. For example, when a can body having a can body diameter of 66 mm and a capacity of 350 cc, which is generally used, is formed, the total drawing ratio is preferably set to 2.2 to 2.4. Further, when a can body having a can body diameter of about 66 mm and a capacity of about 500 cc is molded, the total drawing ratio is preferably set to 2.45 to 2.65.
ここで、総絞り比Ａとは、カップ絞り比Ｂ（図１（ａ）〜（ｂ）の工程）と、再絞り比Ｃ（図１（ｂ）〜（ｃ）の工程）を掛け合わせた値であり、次式（１）〜（３）で表される。
カップ絞り比Ｂ ＝ ブランク径Ｄ１／カップ径Ｄ２ ・・・（１）
再絞り比Ｃ ＝ カップ径Ｄ２／胴部径Ｄ３ ・・・（２）
総絞り比Ａ ＝ カップ絞り比Ｂ×再絞り比Ｃ ＝ ブランク径Ｄ１／胴部径Ｄ３ ・・・（３）
Here, the total drawing ratio A is obtained by multiplying the cup drawing ratio B (steps of FIGS. 1A to 1B) and the redrawing ratio C (steps of FIGS. 1B to 1C). It is a value and is represented by the following formulas (1) to (3).
Cup drawing ratio B = Blank diameter D1 / Cup diameter D2 (1)
Redrawing ratio C = Cup diameter D2 / body diameter D3 (2)
Total drawing ratio A = Cup drawing ratio B × Redrawing ratio C = blank diameter D1 / body part diameter D3 (3)
［ＤＩ加工及び塗装焼付けによる製缶後の缶ボディ胴部の引張強さ］
本発明の缶ボディ用アルミニウム合金板をＤＩ加工及び塗装焼付けして得られる缶ボディの胴部の引張強さは、３３０ＭＰａ超３８０ＭＰａ以下であることが好ましい。
ＤＩ加工及び塗装焼付けによる製缶後の缶ボディ胴部の引張強さが３３０ＭＰａ以下だと、充分な耐流通ピンホール性が得られず、また、３８０ＭＰａを超えると、胴切れが生じ易くなるとともに生産性が低下する。
また、ＤＩ加工及び塗装焼付けによる製缶後の缶ボディ胴部の引張強さは、より好ましくは３４０ＭＰａ超である。
[Tensile strength of can body body after canning by DI processing and paint baking]
It is preferable that the tensile strength of the body part of the can body obtained by DI processing and paint baking of the aluminum alloy plate for can bodies of the present invention is more than 330 MPa and not more than 380 MPa.
If the tensile strength of the body of the can body after making cans by DI processing and paint baking is 330 MPa or less, sufficient distribution-resistant pinhole properties cannot be obtained, and if it exceeds 380 MPa, it becomes easy to cause a cylinder breakage. Productivity decreases.
Further, the tensile strength of the can body trunk after canning by DI processing and paint baking is more preferably over 340 MPa.
［ＤＩ加工及び塗装焼付けによる製缶後の缶胴部の伸び］
本発明の缶ボディ用アルミニウム合金板をＤＩ加工及び塗装焼付けして得られる缶ボディの胴部の伸びは４％以上であることが好ましく、５％以上であることが最も好ましい。
ＤＩ成形直後の胴部は、伸びが低く、また脆いためにピンホールを生じやすい。成形された缶ボディは、洗浄及び化成処理して乾燥し、外面塗装印刷及び内面塗装を行った後の焼付けで加熱されることにより、強度は低下するが、延性を回復する。
上述のような加熱の条件を制御することによって、胴部の伸びを上記下限値以上とすることが必要となるが、例えば１０分間、一定温度で加熱する場合、１８０℃の温度では充分でなく、１９０℃以上の温度で加熱する必要がある。
[Elongation of can body after can making by DI processing and paint baking]
The elongation of the body portion of the can body obtained by DI processing and paint baking of the aluminum alloy plate for can bodies of the present invention is preferably 4% or more, and most preferably 5% or more.
The body portion immediately after DI molding has low elongation and is fragile, so pinholes are likely to occur. The molded can body is dried by washing and chemical conversion treatment, and is heated by baking after the outer surface coating printing and inner surface coating, whereby the ductility is restored although the strength is lowered.
By controlling the heating conditions as described above, it is necessary to make the elongation of the body portion equal to or more than the lower limit. However, for example, when heating at a constant temperature for 10 minutes, a temperature of 180 ° C. is not sufficient. It is necessary to heat at a temperature of 190 ° C. or higher.
［金属間化合物の数］
本発明の缶ボディ用アルミニウム合金板は、円相当径が１〜１０μｍの金属間化合物の数が、３０００〜４８００個／ｍｍ２であることが好ましい。成分組成を上述のように規定し、且つ５６０℃〜融点未満の温度で均質化処理を行なうことにより、この範囲の金属間化合物の分布が得られる。
金属間化合物の数が３０００個／ｍｍ２未満だと、金属間化合物の量が少なくなりすぎ、しごき金型への焼き付が生じやすくなる。
金属間化合物の数が４８００個／ｍｍ２を超えると、金属間化合物の量が多くなりすぎ、靱性が低下し、ピンホールが生じ易くなる。
また、金属間化合物の数は、４４００個／ｍｍ２以下がより好ましい。
[Number of intermetallic compounds]
In the aluminum alloy plate for can bodies of the present invention, the number of intermetallic compounds having an equivalent circle diameter of 1 to 10 μm is preferably 3000 to 4800 pieces / mm 2 . By defining the component composition as described above and performing the homogenization at a temperature of 560 ° C. to less than the melting point, the distribution of intermetallic compounds in this range can be obtained.
When the number of intermetallic compounds is less than 3000 / mm 2 , the amount of intermetallic compounds becomes too small, and seizure to the ironing mold tends to occur.
When the number of intermetallic compounds exceeds 4800 / mm 2 , the amount of intermetallic compounds becomes too large, the toughness is lowered, and pinholes are likely to occur.
The number of intermetallic compounds is more preferably 4400 / mm 2 or less.
［金属間化合物の面積率］
本発明の缶ボディ用アルミニウム合金板は、円相当径が１〜１０μｍの金属間化合物の面積率が１．５〜２．５％であることが好ましい。
金属間化合物の面積率が１．５％未満だと、金属間化合物の量が少なくなりすぎ、しごき金型への焼き付が生じやすくなる。
金属間化合物の面積率２．５％を超えると、金属間化合物の量が多くなりすぎ、靭性が低下し、ピンホールが生じやすくなる。
また、金属間化合物の面積率は、２．２％以下であることがより好ましい。
[Area ratio of intermetallic compounds]
In the can body aluminum alloy plate of the present invention, the area ratio of the intermetallic compound having an equivalent circle diameter of 1 to 10 μm is preferably 1.5 to 2.5%.
When the area ratio of the intermetallic compound is less than 1.5%, the amount of the intermetallic compound is too small, and seizure to the ironing mold is likely to occur.
When the area ratio of the intermetallic compound exceeds 2.5%, the amount of the intermetallic compound is excessively increased, the toughness is lowered, and pinholes are easily generated.
The area ratio of the intermetallic compound is more preferably 2.2% or less.
［ＤＩ加工による製缶工程］
以下、図１を用いて、缶ボディ用アルミニウム合金材にＤＩ加工を施して製缶し、缶ボディ１０を得る工程の一例を説明する。
[Can manufacturing process by DI processing]
Hereinafter, an example of a process of obtaining a
まず、図１（ａ）に示すように、缶ボディ用アルミニウム合金材に打ち抜き加工を施し、直径が１４９ｍｍの円板状の板材を得る。
ついで、この円板状の板材に絞り加工を施し、図１（ｂ）に示すような、軸線方向における高さが４２ｍｍ、外径が８８．２ｍｍとされたカップ状缶体を形成する。ここで、円板状の板材は、厚さが０．２５０ｍｍ以上０．２７５ｍｍ未満とされている。
First, as shown in FIG. 1 (a), a can body aluminum alloy material is punched to obtain a disk-shaped plate material having a diameter of 149 mm.
Next, the disk-shaped plate member is drawn to form a cup-shaped can body having a height in the axial direction of 42 mm and an outer diameter of 88.2 mm as shown in FIG. Here, the disc-shaped plate material has a thickness of 0.250 mm or more and less than 0.275 mm.
次いで、図１（ｂ）に示すカップ状缶体に再絞り加工を施し、図１（ｃ）に示すような外形６６ｍｍのカップ状缶体とする。ここで、Ｄ１とＤ３との比は、２．０〜２．７とされており、図示例では１４９／６６＝２．２６である。
次いで、総しごき率が５０％以上６０％未満となるように、しごき加工を施し、図１（ｄ）に示すような有底筒状缶体を形成する。この有底筒状体の開口端部は、その缶軸方向に波打つような凹凸形状とされる。
Next, the cup-shaped can body shown in FIG. 1B is redrawn to obtain a cup-shaped can body having an outer diameter of 66 mm as shown in FIG. Here, the ratio between D1 and D3 is set to 2.0 to 2.7, and in the illustrated example, 149/66 = 2.26.
Next, ironing is performed so that the total ironing rate is 50% or more and less than 60%, thereby forming a bottomed cylindrical can body as shown in FIG. The opening end portion of the bottomed cylindrical body has an uneven shape that undulates in the direction of the can axis.
次いで、図１（ｄ）に示す有底筒状体の開口端部を切断して、缶軸方向における大きさ、つまり高さをその全周に亙って約１２３．５ｍｍと同等にし、外径が６５ｍｍ以上６７ｍｍ以下とされた胴部１１と底部１２とを有する横断面円形の缶ボディ１０を形成する。本例では、図２に示すように、底部１２が、胴部１１の缶軸方向における内側に向けて凹むドーム部１２ａを備えるとともに、このドーム部１２ａの外周縁部が胴部１１の缶軸方向における外側に向けて突出する環状凸部１２ｃとされている。この環状凸部１２ｃの缶軸方向における頂部が、缶ボディ１０が正立姿勢となるように、この缶ボディ１０を接地面Ｌ上に配置したときに、接地面Ｌに接する接地部１２ｂとされる。
Next, the open end of the bottomed cylindrical body shown in FIG. 1 (d) is cut so that the size in the can axis direction, that is, the height is equal to about 123.5 mm over the entire circumference. A can
以上説明したように、本実施形態の耐流通ピンホール性に優れる缶ボディ用アルミニウム合金板によれば、成分組成を上述の範囲内とし、また、素材の板厚を０．２５０ｍｍ以上０．２７５ｍｍ未満と薄く構成し、且つ製缶された缶ボディの胴部の板厚を０．１１０ｍｍ超０．１２５ｍｍ以下と厚く構成することにより、総しごき率を５０％以上６０％未満と低くすることが可能となるため、胴切れが生じにくくなる。これにより、素材強度を、ベーキング後の素材耐力で２６５ＭＰａ以上と高くした場合でも、胴切れが発生するのを抑制することができる。
また、素材強度を高くすることにより、ＤＩ加工及び塗装焼付けによる製缶後の缶ボディ胴部の強度を、引張強さで３３０ＭＰａ超３８０ＭＰａ以下（好ましくは３４０ＭＰａ超）と高くできるので、前記胴部の突き刺し強度が向上し、胴部にピンホールが生じるのを抑制することができる。
また、素材板厚を薄くすることにより、缶ボディの重量を従来と同等に抑制することができる。
従って、本発明の缶ボディ用アルミニウム合金板を用いることにより、製造コストを増大させることなく、耐流通ピンホール性に優れた缶ボディを得ることができる。
As described above, according to the aluminum alloy plate for a can body excellent in flow-resistant pinhole property of the present embodiment, the component composition is within the above range, and the thickness of the material is 0.250 mm or more and 0.275 mm. By making the body thickness of the body of the can body made as thick as less than 0.110 mm and less than 0.125 mm, the total ironing rate can be lowered to 50% or more and less than 60%. Since it becomes possible, it becomes difficult to produce a torso cut. Thereby, even when the strength of the material is increased to 265 MPa or more as the material yield strength after baking, it is possible to suppress the occurrence of torsion.
Moreover, by increasing the material strength, the strength of the can body barrel after canning by DI processing and paint baking can be increased to a tensile strength of more than 330 MPa and less than 380 MPa (preferably more than 340 MPa). This improves the piercing strength and prevents the pinhole from occurring in the body portion.
Further, by reducing the thickness of the material plate, the weight of the can body can be suppressed to the same level as in the past.
Therefore, by using the aluminum alloy plate for a can body of the present invention, a can body excellent in circulation pinhole resistance can be obtained without increasing the production cost.
以下、実施例を示して、本発明の耐流通ピンホール性に優れる缶ボディ用アルミニウム合金板を更に詳しく説明するが、本発明はこの実施例に限定されるものでは無い。
本実施例では、下記表１及び表２に示す成分組成及び製造条件にて、以下の工程で本発明の耐流通ピンホール性に優れる缶ボディ用アルミニウム合金板（実施例）及び比較例の缶ボディ用アルミニウム合金板を作製し、後述の各項目について評価を行った。
Hereinafter, although an Example is shown and the aluminum alloy plate for can bodies excellent in the distribution | circulation resistance pinhole property of this invention is demonstrated in more detail, this invention is not limited to this Example.
In this example, the cans of the aluminum alloy plates for can bodies (Examples) and the cans of the comparative examples, which have excellent flow-resistant pinhole properties according to the present invention in the following steps, with the component compositions and production conditions shown in Tables 1 and 2 below. An aluminum alloy plate for a body was prepared and evaluated for each item described below.
［缶ボディ用アルミニウム合金板作製工程］
下記表１に示す成分を含有するアルミニウム合金を溶解し、この溶湯を常法により脱ガス、介在物除去を行い、半連続鋳造により厚さ５５０ｍｍ、幅１．５ｍ、長さ４．５ｍのスラブに鋳造した。次いで、スラブに表１に示す温度で均熱化処理を施した後、熱間圧延を施した。そして、表１に示す条件で必要に応じて冷間圧延及び中間焼鈍を行った後、最終冷間圧延を施して、板厚を０．２７０ｍｍとした実施例１〜６及び比較例１〜４の缶ボディ用アルミニウム合金板、並びに板厚を０．２９５ｍｍとした比較例５の缶ボディ用アルミニウム合金板を得た。なお、実施例１〜６、比較例１〜５の缶ボディ用アルミニウム合金板には、下記表１に示す量でリオイルを施した。
上述のようにして得られた缶ボディ用アルミニウム合金板の各サンプルについて、ＥＰＭＡ（Ｅｌｅｃｔｒｏｎ Ｐｒｏｂｅ Ｍｉｃｒｏ Ａｎａｌｙｓｅｒ）を用いてＳＥＭ画像及び組成像を画像解析し、Ｍｎを含有する金属間化合物を測定することにより、円相当径が１〜１０μｍの金属間化合物の数及び面積率を調べた。この際、各サンプルの表面を、圧延痕が消えるまで研磨した後、合金板表面に対して垂直方向の画像を観察し、解析を行なった。
また、缶ボディ用アルミニウム合金板の各サンプルについて、２１０℃で１０分加熱後（ベーキング後）の０．２％耐力ＹＳを測定した。
[Production process of aluminum alloy plate for can body]
An aluminum alloy containing the components shown in Table 1 below was melted, the molten metal was degassed and inclusions removed by conventional methods, and a slab having a thickness of 550 mm, a width of 1.5 m, and a length of 4.5 m was obtained by semi-continuous casting. Cast into. Next, the slab was subjected to a soaking treatment at the temperature shown in Table 1, and then subjected to hot rolling. And after performing cold rolling and intermediate annealing as needed under the conditions shown in Table 1, Examples 1 to 6 and Comparative Examples 1 to 4 having a final thickness of 0.270 mm were applied. An aluminum alloy plate for a can body and an aluminum alloy plate for a can body of Comparative Example 5 having a plate thickness of 0.295 mm were obtained. In addition, reoil was given to the aluminum alloy plates for can bodies of Examples 1 to 6 and Comparative Examples 1 to 5 in the amounts shown in Table 1 below.
For each sample of an aluminum alloy plate for a can body obtained as described above, an SEM image and a composition image are image-analyzed using EPMA (Electron Probe Micro Analyzer), and an intermetallic compound containing Mn is measured. Thus, the number and area ratio of intermetallic compounds having an equivalent circle diameter of 1 to 10 μm were examined. At this time, the surface of each sample was polished until the rolling marks disappeared, and then an image perpendicular to the surface of the alloy plate was observed and analyzed.
Moreover, about each sample of the aluminum alloy plate for can bodies, 0.2% yield strength YS after heating at 210 degreeC for 10 minutes (after baking) was measured.
［缶ボディの製缶］
上述の工程で得られた各実施例及び比較例の缶ボディ用アルミニウム合金板を打ち抜き、直径が１４１ｍｍ、または１４９ｍｍとされた円板状の板材（図１（ａ）参照）を得た。この円板状の板材にＤＩ加工を施し、胴部の最薄部肉厚Ｔ２が下記表２に示す肉厚になるまで絞り加工及びしごき加工を行い、各実施例及び比較例の缶ボディ（３５０ｃｃ缶）を得た。なお、この際の総絞り比及び総しごき率を、前式（１）〜（４）式によって求め、下記表２に示した。
[Can body manufacturing]
The aluminum alloy plate for can bodies of each Example and Comparative Example obtained in the above-described steps was punched out to obtain a disk-shaped plate material having a diameter of 141 mm or 149 mm (see FIG. 1 (a)). This disk-shaped plate material is subjected to DI processing, and drawing and ironing are performed until the thinnest part thickness T2 of the body reaches the thickness shown in Table 2 below. 350 cc can) was obtained. In addition, the total drawing ratio and the total ironing ratio at this time were determined by the previous formulas (1) to (4) and are shown in Table 2 below.
上述のようにしてＤＩ加工した各実施例及び比較例の缶ボディに対し、以下に説明する方法で外面塗装及び外面印刷、並びに内面塗装を行なった。
まず、塗料としてエポキシ系塗料及びアクリル系塗料を使用し、文字情報等の印刷部分も含め、缶ボディの外面に５０ｍｇ／ｄｍ２の膜厚で塗布した。そして、この缶ボディをオーブンに入れ、１８０℃の温度で３０秒間、加熱乾燥した。
また、上述のようにして外面塗装を施した缶ボディの内面に、スプレーを使用してエポキシ塗料を４０ｍｇ／ｄｍ２の膜厚で塗布した。そして、この缶ボディをオーブンに入れ、２００℃の温度で６０秒間、加熱乾燥した。
The can body of each of the examples and comparative examples subjected to DI processing as described above was subjected to outer surface coating, outer surface printing, and inner surface coating by the method described below.
First, an epoxy paint and an acrylic paint were used as paints, and applied to the outer surface of the can body at a film thickness of 50 mg / dm 2 including printed portions such as character information. And this can body was put into oven and heat-dried at the temperature of 180 degreeC for 30 second.
Moreover, the epoxy paint was apply | coated by the film thickness of 40 mg / dm < 2 > using the spray to the inner surface of the can body which gave the outer surface coating as mentioned above. And this can body was put into oven and heat-dried at the temperature of 200 degreeC for 60 second.
［缶ボディの評価項目］
上述の工程で得られた各実施例及び比較例の缶ボディについて、缶ボディの胴部における引張強さＴＳ、伸び率、及び突き刺し強度を測定した。
引張強さＴＳ及び伸び率は、各実施例及び比較例の缶ボディから引張試験片を採取し、全長７５ｍｍ、平行部長３６ｍｍ、平行部幅１０ｍｍ、つかみ部幅１５ｍｍ、肩半径１５ｍｍの寸法形状に加工した試験片を用いて評価した。この際、缶の接地部から缶軸方向上方に６０ｍｍ離れた部分が引張試験片の中心となり、引張方向が缶軸方向となるようにした。そして、外面及び内面の塗装を、硝酸を用いて脱膜処理した後、引張試験を行うことにより、引張強さＴＳ及び伸び率を測定した。
また、突き刺し強度は、室温（２０℃）雰囲気中において、缶ボディに０．１９６ＭＰａの内圧をかけた状態とし、缶ボディ胴部のうち、接地部から缶軸方向上方に６０ｍｍ離れた部分を、曲率半径２．２５ｍｍとされた押圧子によって径方向内方に向けて押圧し、穴があいた時の押圧力で評価した。この際、押圧子の胴部の径方向内方へ向けた移動速度を２５ｍｍ／ｍｉｎとした。
[Can body evaluation items]
About the can body of each Example obtained by the above-mentioned process and the comparative example, tensile strength TS in the trunk | drum of a can body, elongation rate, and piercing strength were measured.
Tensile strength TS and elongation rate were obtained by collecting tensile test pieces from the can body of each example and comparative example, and having a total length of 75 mm, a parallel part length of 36 mm, a parallel part width of 10 mm, a grip part width of 15 mm, and a shoulder radius of 15 mm Evaluation was performed using the processed specimen. At this time, the portion 60 mm away from the can's ground contact portion in the upper direction of the can axis was the center of the tensile test piece, and the tensile direction was the can axis direction. Then, after the coating of the outer surface and the inner surface was removed using nitric acid, a tensile test was performed to measure the tensile strength TS and the elongation.
Further, the piercing strength is a state in which an internal pressure of 0.196 MPa is applied to the can body in a room temperature (20 ° C.) atmosphere, and a portion of the can body trunk that is 60 mm away from the grounding portion upward in the can axis direction, The pressure was applied inward in the radial direction with a pressing element having a curvature radius of 2.25 mm, and the evaluation was performed by the pressing force when a hole was formed. At this time, the moving speed of the body of the presser toward the inside in the radial direction was set to 25 mm / min.
各実施例、比較例の組成成分、製造条件並びに評価試験結果を表１及び表２に示す。
なお、表１の中間焼鈍の欄に示すＩＡ−ＣＡＬとは、合金板作製工程において、冷間圧延と冷間圧延との間で連続中間焼鈍を行なったことを示し、また、ＨＯＴ−ＣＡＬとは、合金板作製工程において、熱間圧延と冷間圧延との間で連続焼鈍を行なったことを示している。
Tables 1 and 2 show the composition components, production conditions, and evaluation test results of the examples and comparative examples.
In addition, IA-CAL shown in the column of intermediate annealing in Table 1 indicates that continuous intermediate annealing was performed between cold rolling and cold rolling in the alloy plate manufacturing process, and HOT-CAL Shows that continuous annealing was performed between hot rolling and cold rolling in the alloy plate manufacturing process.
［評価結果］
表１及び表２に示すように、本発明で規定する成分組成を有し、本発明で規定する機械的特性条件を有して得られた、実施例１〜６に示す本発明の缶ボディ用アルミニウム合金板は、何れも、アルミニウム合金板素材のベーキング後の引張強さと耐力の差ＡＢ・ＴＳ−ＡＢ・ＹＳが３１ＭＰａ以上であった。また、何れも、ＤＩ加工及び塗装焼付けによる製缶後の缶ボディ胴部の引張強さＴＳが３３６Ｍｐａ以上であり、伸び率が４．１％以上、突き刺し強度が１３９ＭＰａ以上であった。また、ＤＩ工程（製缶工程）における胴切れ発生率は、０〜１０ｐｐｍの範囲内であった。
このように、実施例１〜６に示す本発明の缶ボディ用アルミニウム合金板は、何れも高い機械的特性を有し、耐流通ピンホール性に優れていることが明らかであるとともに、製造効率に優れていることが明らかである。
[Evaluation results]
As shown in Tables 1 and 2, the can body of the present invention shown in Examples 1 to 6 having the component composition defined in the present invention and having the mechanical characteristic conditions defined in the present invention All of the aluminum alloy plates for use had a difference in tensile strength and proof stress after baking of the aluminum alloy plate material AB · TS−AB · YS of 31 MPa or more. In all cases, the tensile strength TS of the can body barrel after canning by DI processing and paint baking was 336 Mpa or more, the elongation was 4.1% or more, and the piercing strength was 139 MPa or more. In addition, the rate of occurrence of cylinder breakage in the DI process (can manufacturing process) was in the range of 0 to 10 ppm.
Thus, it is clear that the aluminum alloy plates for can bodies of the present invention shown in Examples 1 to 6 all have high mechanical characteristics and excellent flow-resistant pinhole properties, and production efficiency. It is clear that this is superior.
これに対し、比較例１の缶ボディ用アルミニウム合金板は、ベーキング後の素材耐力ＹＳ（０．２％耐力）が２５３ＭＰａとされており、ＤＩ加工及び塗装焼付けによる製缶後の胴部の引張強さが３２８ＭＰａであった。比較例１の缶ボディ用アルミニウム合金板は、ベーキング後の素材の引張強さと耐力の差こそ２８ＭＰａであったものの、突き刺し強度が１３２ＭＰａとなっており、実施例１〜６の缶ボディ用アルミニウム合金板に比べて劣る結果となった。 On the other hand, the aluminum alloy plate for can bodies of Comparative Example 1 has a material yield strength YS (0.2% yield strength) after baking of 253 MPa, and the tension of the barrel after canning by DI processing and paint baking The strength was 328 MPa. The aluminum alloy plate for can body of Comparative Example 1 had a piercing strength of 132 MPa although the difference between the tensile strength and the proof stress of the material after baking was 28 MPa, and the aluminum alloy for can body of Examples 1 to 6 The result was inferior to the board.
また、比較例２の缶ボディ用アルミニウム合金板は、ベーキング後の素材耐力ＹＳが２６４ＭＰａとされており、ＤＩ加工及び塗装焼付けによる製缶後の胴部の引張強さが３２６ＭＰａであった。比較例２の缶ボディ用アルミニウム合金板は、ベーキング後の素材の引張強さと耐力が２６ＭＰａとなり、また、突き刺し強度が１３３ＭＰａとなっており、実施例１〜６の缶ボディ用アルミニウム合金板に比べて劣る結果となった。 Moreover, the aluminum alloy plate for can bodies of Comparative Example 2 had a material yield strength YS after baking of 264 MPa, and the tensile strength of the body after canning by DI processing and paint baking was 326 MPa. The aluminum alloy plate for can bodies of Comparative Example 2 has a tensile strength and yield strength of the material after baking of 26 MPa and a piercing strength of 133 MPa, which is compared with the aluminum alloy plates for can bodies of Examples 1 to 6. The result was inferior.
また、比較例３の缶ボディ用アルミニウム合金板は、ベーキング後の素材耐力ＹＳが２６７ＭＰａ、引張強さが２９２ＭＰａとされており、また、ＤＩ加工及び塗装焼付けによる製缶後の胴部の伸びが３．８％と本発明で規定する範囲を下回っており、製缶後の引張強さが３３１ＭＰａであった。比較例３の缶ボディ用アルミニウム合金板は、ベーキング後の素材の引張強さと耐力の差が２５ＭＰａとなり、また、突き刺し強度が１３１ＭＰａと、実施例１〜６の缶ボディ用アルミニウム合金板に比べて劣る結果となった。 In addition, the aluminum alloy plate for can body of Comparative Example 3 has a material yield strength YS after baking of 267 MPa and a tensile strength of 292 MPa. Also, the elongation of the body after the can is made by DI processing and paint baking is increased. The tensile strength after canning was 331 MPa, being 3.8%, which is below the range specified in the present invention. The aluminum alloy plate for can body of Comparative Example 3 has a difference between the tensile strength and the proof stress of the material after baking of 25 MPa, and the piercing strength is 131 MPa, compared with the aluminum alloy plate for can body of Examples 1-6. The result was inferior.
また、比較例４の缶ボディ用アルミニウム合金板は、Ｍｇの含有量が２．２９％であるとともに、ＤＩ加工及び塗装焼付けによる製缶後の引張強さが３８２ＭＰａと本発明の規定範囲外となっており、ベーキング後の素材耐力ＹＳが３１５ＭＰａ、引張強さが３５２ＭＰａであった。比較例４の缶ボディ用アルミニウム合金板は、ベーキング後の素材の引張強さと耐力の差が３７ＭＰａであり、突き刺し強度が１４９ＭＰａと高かったものの、胴切れ発生率が２００ｐｐｍとなっており、実施例１〜６の缶ボディ用アルミニウム合金板に比べて劣る結果となった。 Further, the aluminum alloy plate for can body of Comparative Example 4 has a Mg content of 2.29%, and the tensile strength after canning by DI processing and paint baking is 382 MPa, which is outside the specified range of the present invention. The material yield strength YS after baking was 315 MPa, and the tensile strength was 352 MPa. The aluminum alloy plate for can body of Comparative Example 4 has a difference between the tensile strength and the proof stress of the material after baking is 37 MPa and the piercing strength is as high as 149 MPa, but the rate of occurrence of torsion is 200 ppm. It was inferior to the aluminum alloy plates for can bodies of 1-6.
また、比較例５の缶ボディ用アルミニウム合金板は、素材の板厚が０．２９５ｍｍ、ＤＩ加工及び塗装焼付けによる製缶後の胴部の最薄部肉厚Ｔ２が０．１０６ｍｍと本発明の規定範囲外となっている。従って、総しごき率が６４％と、本発明の規定範囲外となっている。比較例５の缶ボディ用アルミニウム合金板は、ベーキング後の素材の引張強さと耐力の差こそ３９ＭＰａであったものの、突き刺し強度が１２５ＭＰａであるとともに、胴切れ発生率が３００ｐｐｍとなっており、実施例１〜６の缶ボディ用アルミニウム合金板に比べて劣る結果となった。 Further, the aluminum alloy plate for the can body of Comparative Example 5 has a material thickness of 0.295 mm, and the thinnest portion thickness T2 of the barrel after can processing by DI processing and paint baking is 0.106 mm. It is out of the specified range. Therefore, the total ironing rate is 64%, which is outside the specified range of the present invention. The aluminum alloy plate for the can body of Comparative Example 5 had a difference between the tensile strength and the yield strength of the material after baking of 39 MPa, but the piercing strength was 125 MPa and the rate of occurrence of torsion was 300 ppm. It was inferior to the aluminum alloy plate for can bodies of Examples 1-6.
以上の結果により、本発明で規定された各種特性を有する缶ボディ用アルミニウム合金材が、高い機械的特性を有し、耐流通ピンホール性に優れていることが明らかである。 From the above results, it is clear that the aluminum alloy material for can bodies having various characteristics defined in the present invention has high mechanical characteristics and excellent circulation pinhole resistance.
１０…缶ボディ、１１…胴部、１２…底部
10 ... can body, 11 ... body, 12 ... bottom
Claims (4)
質量％で、Ｓｉ：０．１５〜０．５％、Ｆｅ：０．３〜０．６％、Ｃｕ：０．１５〜０．５％、Ｍｎ：０．７〜１．２％、Ｍｇ：０．８〜２．０％を含有し、残部が不可避不純物を含むＡｌからなり、
前記円板状の板材の板厚が０．２５０ｍｍ以上０．２７５ｍｍ未満であり、ベーキング後の素材耐力が２６５ＭＰａ以上であり、ベーキング後の素材の引張強さと耐力の差が２８ＭＰａ以上であり、ＤＩ加工及び塗装焼付けによる製缶後の缶ボディの胴部の引張強さが３３０ＭＰａ超３８０ＭＰａ以下であるとともに、前記胴部の伸びが４％以上であることを特徴とする、耐流通ピンホール性に優れる缶ボディ用アルミニウム合金板。 The body portion has a thickness of more than 0.110 mm and not more than 0.125 mm, and a first cup-shaped can body having a predetermined cup diameter D2 is formed by drawing from a disk-shaped plate material having a predetermined blank diameter D1, and then redrawing When the second cup-shaped can body having the predetermined body diameter D3 is formed, the total drawing ratio indicated by D1 / D3 is 2.0 to 2.7, and the second cup-shaped can body is When making the final can body by ironing, assuming that the thickness of the disk-shaped plate material is T1, and the final can body thickness is T2, (T1-T2) / T1 × 100 (%) A can body aluminum alloy plate used for manufacturing a can body having a total ironing ratio of 50% or more and less than 60%,
In mass%, Si: 0.15-0.5%, Fe: 0.3-0.6%, Cu: 0.15-0.5%, Mn: 0.7-1.2%, Mg: Containing 0.8 to 2.0%, the balance is made of Al containing inevitable impurities,
The thickness of the disk-shaped plate material is 0.250 mm or more and less than 0.275 mm, the material yield strength after baking is 265 MPa or more, the difference between the tensile strength and the yield strength of the material after baking is 28 MPa or more, DI The tensile strength of the body portion of the can body after can making by processing and paint baking is more than 330 MPa and not more than 380 MPa, and the elongation of the body portion is 4% or more. Excellent aluminum alloy plate for can body.
板厚が０．２５０ｍｍ以上０．２７５ｍｍ未満であり、前記アルミニウム合金板からなる所定ブランク径Ｄ１の円板状の板材から絞り加工により所定カップ径Ｄ２の第一のカップ状缶体を形成し、再絞り加工により所定胴部径Ｄ３の第二のカップ状缶体を形成する場合においてＤ１／Ｄ３で示される総絞り比を２．０〜２．７とし、且つ、前記第二のカップ状缶体をしごき加工により最終缶ボディとする際、前記円板状の板材の板厚をＴ１、最終缶ボディ胴部最薄部厚さをＴ２とした場合、（Ｔ１−Ｔ２）／Ｔ１×１００（％）で示される総しごき率を５０％以上６０％未満として胴部の厚さが０．１１０ｍｍ超０．１２５ｍｍ以下であり、ＤＩ加工及び塗装焼付けによる製缶後の缶ボディの胴部の引張強さが３３０ＭＰａ超３８０ＭＰａ以下であり、前記胴部の伸びが４％以上である缶ボディを製造することを特徴とする耐流通ピンホール性に優れる缶ボディの製造方法。A plate thickness of 0.250 mm or more and less than 0.275 mm, and forming a first cup-shaped can body having a predetermined cup diameter D2 by drawing from a disk-shaped plate material having a predetermined blank diameter D1 made of the aluminum alloy plate, When the second cup-shaped can body having a predetermined body diameter D3 is formed by redrawing, the total drawing ratio indicated by D1 / D3 is 2.0 to 2.7, and the second cup-shaped can When the body is made into a final can body by ironing, when the thickness of the disk-shaped plate material is T1 and the final can body body thinnest part thickness is T2, (T1-T2) / T1 × 100 ( %) And the thickness of the barrel is more than 0.110 mm and not more than 0.125 mm, and the tension of the barrel of the can body after canning by DI processing and paint baking Strength is over 330MPa and over 380MPa , And the production method of the can body having excellent fluid-tight communication pinhole resistance, characterized in that to produce a can body elongation of the body portion is 4% or more.
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