JP2018177289A - Aluminum seamless can - Google Patents
Aluminum seamless can Download PDFInfo
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- JP2018177289A JP2018177289A JP2017078918A JP2017078918A JP2018177289A JP 2018177289 A JP2018177289 A JP 2018177289A JP 2017078918 A JP2017078918 A JP 2017078918A JP 2017078918 A JP2017078918 A JP 2017078918A JP 2018177289 A JP2018177289 A JP 2018177289A
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 48
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000010409 ironing Methods 0.000 description 45
- 238000012545 processing Methods 0.000 description 21
- 238000000034 method Methods 0.000 description 19
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- 229910000838 Al alloy Inorganic materials 0.000 description 9
- 238000004080 punching Methods 0.000 description 8
- 239000011777 magnesium Substances 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000003854 Surface Print Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000002966 varnish Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000013585 weight reducing agent Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000010415 tropism Effects 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
Description
本発明は、アルミシームレス缶に関するものであり、より詳細には、胴部が極薄肉化されているアルミシームレス缶に関する。 The present invention relates to an aluminum seamless can, and more particularly, to an aluminum seamless can having an extremely thinned body.
各種金属或いは合金からなる素板を打抜き、次いでパンチとダイスを用いて、絞り−再絞り加工、さらに繰り返しのしごき加工を行うことにより、継ぎ目が無く、外観に優れているばかりか、底蓋の巻締め加工が不要なシームレス缶を製造する方法が、古くから実用化されている。 Not only there are no joints and the appearance is excellent, but by performing punching, redrawing and repeated ironing using blanks made of various metals or alloys and then using punches and dies, the bottom cover A method of producing seamless cans that do not require winding and tightening has been in practical use for a long time.
このようなシームレス缶は、缶胴が薄肉化されているため、軽量性に優れており、特にアルミニウムは加工し易いことから、アルミニウム製のシームレス缶は、飲料等の用途に広く使用されている。 Such a seamless can is excellent in lightness because the can body is thin, and in particular, aluminum is easy to process, and therefore the seamless can made of aluminum is widely used for applications such as beverages. .
ところで、シームレス缶では、缶胴部の薄肉化に伴い、耐圧強度が低下し、例えば容器内圧力（例えば、ビールや炭酸飲料などの内容物による自生圧力）により、缶底部がバックリングするなどの問題を生じる。特にアルミシームレス缶は、このような問題を生じ易く、アルミ素材の化学組成についての検討に加え、底部のバックリングを防止するための缶底部の形状について種々の提案がなされている。 By the way, in a seamless can, the pressure resistance strength decreases with thinning of the can body, and for example, the can bottom buckles due to the pressure in the container (for example, the autogenous pressure due to the contents of beer or carbonated beverage) It causes a problem. In particular, aluminum seamless cans are prone to such problems, and various proposals have been made on the shape of the can bottom for preventing buckling of the bottom, in addition to the study on the chemical composition of the aluminum material.
例えば、特許文献１には、シームレス缶について、底部中心部分を上方に膨らんだドーム部（ボトムパネルドーム部）とし、このドーム周縁に連なる接地部と、接地部から外方に傾斜して延びているチャイム部（ボディウオールテーパー部）とが設けられている底部の形態が示されている。即ち、この形態では、チャイム部の上端が、薄肉化されている胴部に連なっている。
現在、市販されている多くのシームレス缶の底部は、上記のような形態が採用されている。
For example, Patent Document 1 describes a seamless can having a dome portion (bottom panel dome portion) in which a bottom central portion bulges upward, and a grounding portion connected to the periphery of the dome and a slope extending outward from the grounding portion The form of the bottom part provided with the chime part (body wall taper part) is shown. That is, in this form, the upper end of the chime portion is continued to the thinned trunk portion.
At the bottom of many seamless cans currently marketed, the form as described above is adopted.
しかしながら、絞り−しごき加工技術の進歩に伴う缶胴壁の極薄肉化に伴い、耐圧強度の点では満足し得るとしても、軸荷重強度が低下することにより座屈を生じ易くなるという問題があり、このため、その改善が求められている。 However, there is a problem that even if it can be satisfied in terms of the pressure resistance strength along with the extremely thinning of the can body wall accompanying the progress of the drawing-ironing technology, there is a problem that the axial load strength is reduced to cause buckling easily. Because of this, there is a need for improvement.
従って本発明の目的は、缶胴壁の厚みが極めて薄いにもかかわらず、座屈が有効に防止されたアルミシームレス缶を提供することにある。 Therefore, an object of the present invention is to provide an aluminum seamless can in which buckling is effectively prevented although the thickness of the can body wall is extremely thin.
本発明によれば、底部と薄肉化された胴部とを有するアルミシームレス缶において、
前記底部が、中央部に位置する上方に膨らんだドーム部と、該ドーム部周縁から降下した接地部と、該接地部から外方かつ上方に傾斜して延びて前記胴部下端に連なるチャイム部とからなり、
前記ドーム部の中心厚み（Ｔ０）が０．２４５〜０．２６５ｍｍの範囲にあり、
前記胴部における最薄肉部の厚み（ＴＷ）が、前記ドーム部の中心厚み（Ｔ０）の３０〜４２％の範囲にあり、かつ該最薄肉部が胴部長さの少なくとも５０％以上にわたって存在しており、
前記チャイム部と前記胴部との境界Ｘ１から５ｍｍ上方に位置する基準部での胴部厚み（Ｔ１）が０．１３７〜０．１７７ｍｍの範囲にあることを特徴とするアルミシームレス缶が提供される。
According to the present invention, in an aluminum seamless can having a bottom and a thin-walled body,
The bottom portion includes an upwardly expanding dome portion located at a central portion, a ground portion lowered from the periphery of the dome portion, and a chime portion extending outward and upward from the ground portion and extending to the lower end of the trunk portion. Consists of
The center thickness (T0) of the dome portion is in the range of 0.245 to 0.265 mm,
The thickness (TW) of the thinnest portion of the trunk portion is in the range of 30 to 42% of the central thickness (T0) of the dome portion, and the thinnest portion exists over at least 50% or more of the trunk length. Yes,
There is provided an aluminum seamless can characterized in that a body thickness (T1) at a reference portion located 5 mm above the boundary X1 between the chime portion and the body portion is in the range of 0.137 to 0.177 mm. Ru.
本発明のアルミシームレス缶においては、
（１）前記最薄肉部の厚み（ＴＷ）と前記厚み（Ｔ１）との比（ＴＷ／Ｔ１）が０．４９〜０．６９の範囲にあること、
（２）１０８０Ｎ以上の軸荷重強度を有していること、
（３）前記基準部でのビッカース硬度が９５〜１１５の範囲にあること、
が好適である。
In the aluminum seamless can of the present invention,
(1) The ratio (TW / T1) of the thickness (TW) of the thinnest portion to the thickness (T1) is in the range of 0.49 to 0.69,
(2) having an axial load strength of 1080 N or more,
(3) The Vickers hardness in the reference portion is in the range of 95 to 115,
Is preferred.
本発明のアルミシームレス缶は、最薄肉部が胴部長さの少なくとも５０％以上の範囲にあり、底部の中心となるドーム部の中心厚み（Ｔ０）が０．２４５〜０．２６５ｍｍの範囲にある。この中心厚み（Ｔ０）は、この缶の成形に用いる素板の厚みよりもドーミング加工によりやや薄くなっている。従って、本発明において、胴部における最薄肉部の厚み（ＴＷ）が底部におけるドーム部の中心厚み（Ｔ０）の３０〜４２％の範囲にあるということは、このアルミシームレス缶は、素板が薄肉化され、胴部が薄肉化され、かつ胴部における薄肉化胴部の割合が大きいことを示している。 In the aluminum seamless can of the present invention, the thinnest portion is at least 50% or more of the length of the body portion, and the center thickness (T0) of the dome portion to be the center of the bottom portion is in the range of 0.245 to 0.265 mm . The center thickness (T0) is slightly thinner by doming than the thickness of the base plate used to form the can. Therefore, in the present invention, the thickness (TW) of the thinnest portion in the body portion is in the range of 30 to 42% of the center thickness (T0) of the dome portion in the bottom portion. It shows that the thickness is reduced, the thickness of the body is reduced, and the ratio of the thickness of the thinned body in the body is large.
即ち、本発明のアルミシームレス缶は、薄肉の素板を用いて缶胴部が極薄肉に成形加工されているにもかかわらず、底部に近い位置での胴部厚み（Ｔ１）を一定の範囲に設定しておくことにより、例えば１０８０Ｎ以上の極めて高い軸荷重強度を確保することができ、この結果、座屈を有効に防止でき、従って、缶の一層の薄肉化が可能となったものである。
このような高い軸荷重強度を示す本発明のアルミシームレス缶は、ネックイン加工、フランジ加工あるいは充填時の二重巻締加工時等において、缶軸方向への大きな圧縮荷重が加わった場合にも座屈が有効に防止されているため、歩留りが高く、生産性に優れており、工業上極めて有用である。
That is, in the aluminum seamless can of the present invention, although the can body is extremely thinly formed using a thin base plate, the body thickness (T1) at a position close to the bottom is within a certain range By setting to a very high axial load strength of, for example, 1080 N or more, it is possible to effectively prevent buckling and, as a result, to make it possible to further thin the can. is there.
The aluminum seamless can of the present invention exhibiting such high axial load strength can be subjected to a large compressive load in the can axial direction during neck-in processing, flange processing or double-rolling processing at the time of filling, etc. Since the buckling is effectively prevented, the yield is high, the productivity is excellent, and it is extremely useful industrially.
＜アルミシームレス缶の形態＞
本発明のアルミシームレス缶は、後述する薄肉の素板を用いての打抜き、絞り、再絞り−しごき加工及びドーミング加工を行った後、洗浄乾燥、外面印刷、仕上げニス塗布焼付、内面塗料塗布焼付、ネックイン加工及びフランジ加工等の後加工を行うことにより得られるものであり、図１に示す形態を有している。
<Form of aluminum seamless can>
The aluminum seamless can of the present invention is subjected to punching, drawing, redrawing, ironing and doming using a thin base plate described later, followed by washing and drying, outer surface printing, finishing varnish coating and baking, inner coating coating baking It is obtained by performing post-processing such as neck-in processing and flange processing, and has a form shown in FIG.
図１及び要部拡大図である図２を参照して、全体として１０で示す本発明のアルミシームレス缶（以下、単にシームレス缶と呼ぶことがある）は、外面がストレートな直胴形状となっている胴部１と、胴部１の下部を閉じている底部３とを有しており、胴部１の上部は、絞られたネックイン部５に連なっており、ネックイン部５の上端には、フランジ部７が形成されている。
かかる形態において、胴部１と底部３との境界Ｘ１、及び胴部１とネックイン部５との境界Ｘ２を次のように定義する。即ち、境界Ｘ１は、チャイム部３ｃの外面傾斜線と缶胴外面垂直線の交点部位と定義し、境界Ｘ２は、缶胴外面垂直線がネックイン部５への曲線との離脱点と定義する。
With reference to FIG. 1 and FIG. 2 which is an enlarged view of the main part, the aluminum seamless can of the present invention generally indicated by 10 (hereinafter sometimes referred to simply as a seamless can) has a straight body with a straight outer surface. The body 1 and the bottom 3 closing the lower part of the body 1, the upper part of the body 1 being connected to the necked-in portion 5 which is squeezed, the upper end of the neck-in 5 The flange portion 7 is formed on the side wall.
In this embodiment, the boundary X1 between the body 1 and the bottom 3 and the boundary X2 between the body 1 and the neck-in 5 are defined as follows. That is, the boundary X1 is defined as the intersection of the outer inclined line of the chime portion 3c and the vertical surface of the can barrel outer surface, and the boundary X2 is defined as the separation point of the can barrel outer vertical line with the curve to the neck-in portion 5 .
このようなシームレス缶１０において、底部３の中央部分は、上方に膨らんだドーム部３ａとなっており、このドーム部３ａの周縁部分から降下した接地部３ｂが形成されており、さらに、接地部３ｂからは外方且つ上方に向かって傾斜して延びているチャイム部３ｃが形成されており、このチャイム部３ｃの上端が胴部１に連なっている。このような形態の底部３において、チャイム部３ｃと胴部１との間には明確な境界Ｘ１が存在している。
上記のような底部３の形態自体は、従来公知のアルミシームレス缶も同じである。
In such a seamless can 10, the central portion of the bottom portion 3 is a dome portion 3a that bulges upward, and a ground portion 3b that is lowered from the peripheral portion of the dome portion 3a is formed. A chime portion 3c extending outward and upward is formed from 3b, and the upper end of the chime portion 3c is connected to the trunk portion 1. In the bottom 3 of such a configuration, a clear boundary X1 exists between the chime 3c and the body 1.
The form itself of the bottom 3 as described above is the same as that of the conventionally known aluminum seamless can.
本発明のアルミシームレス缶１０においては、先ず、底部３の中心部Ｃ０での厚み（Ｔ０）が０．２４５〜０．２６５ｍｍの範囲にある。即ち、この部分の厚み（Ｔ０）は、後述する打抜き加工、絞り加工、再絞り及びしごき加工、さらにはドーミング加工によってやや薄くなっているが、この厚み（Ｔ０）を基準として、胴部１の薄肉化の程度を評価することができる。 In the aluminum seamless can 10 of the present invention, first, a thickness at the center portion C 0 of the bottom 3 (T0) is in the range of 0.245～0.265Mm. That is, although the thickness (T0) of this portion is slightly reduced by punching, drawing, redrawing, ironing, and doming, which will be described later, with reference to this thickness (T0), The degree of thinning can be evaluated.
また、このようなシームレス缶１０では、胴部１の外面はストレートな直線となっているが、胴部１の長さＨの少なくとも５０％以上好ましくは５０〜９０％の範囲にわたって、最薄肉部Ｙとなっており、この最薄肉部Ｙの下方の領域Ｚが、上方から下方に向かって厚みが漸次増大しているテーパー領域となっている。即ち、胴部１の半分もしくはそれ以上が最薄肉部Ｙとなっているということは、胴部１の少なくとも中心Ｃ１は最薄肉部Ｙとなっている。上記テーパー領域の傾斜角度は一定でもよいが、最薄肉部Ｙからの傾斜角度が徐々に大きくなる２段以上の数段階であることが好ましい。また、曲面状であってもよい。傾斜角度を数段階にすることにより、軸荷重強度が向上するため、容器をより軽量化にすることができる。 In such a seamless can 10, the outer surface of the body 1 is a straight straight line, but the thinnest portion is at least 50% or more, preferably 50 to 90% of the length H of the body 1 The region Z below the thinnest portion Y is a tapered region whose thickness gradually increases from the top to the bottom. That is, when half or more of the trunk portion 1 is the thinnest portion Y, at least the center C 1 of the trunk portion 1 is the thinnest portion Y. The inclination angle of the tapered region may be constant, but it is preferable that the inclination angle from the thinnest portion Y be several steps of two or more steps in which the inclination angle gradually increases. Moreover, it may be curved. Since the axial load strength is improved by making the inclination angle in several steps, the container can be made lighter.
さらに、上記の最薄肉部Ｙでの厚み（ＴＷ）は、前述した底部３の中心部Ｃ０での厚み（Ｔ０）の３０〜４２％、特に３５〜４１％（以下、板厚比と呼称することがある）の範囲にある。即ち、本発明のシームレス缶１０では、後述するしごき加工によって、胴部１の半分以上が成形限界に近い領域まで極薄肉化されている。因みに、板厚比が上記の上限値よりも大きくなるようにしごき加工を行うと、軽量化が不十分になる虞があり、下限値よりも下回ると、しごき加工時に缶胴が破胴し成形できなくなる虞がある。 Furthermore, the thickness at the thinnest portion Y (TW) is from 30 to 42% of the thickness (T0) at the center portion C 0 of the bottom 3 described above, in particular from 35 to 41% (hereinafter, referred to as thickness ratio There is a range of That is, in the seamless can 10 of the present invention, at least half of the body portion 1 is extremely thinned to a region close to the forming limit by the ironing process described later. Incidentally, if ironing is performed so that the thickness ratio is larger than the above upper limit value, there is a possibility that the weight reduction will be insufficient, and if it is smaller than the lower limit value, the can barrel may be broken during molding and formed There is a risk that it will not be possible.
ところで、上記のようにしごき加工により成形限界に近い領域まで極薄肉化が行われると、ネックイン加工、フランジ加工あるいは充填時の二重巻締加工時等に際して胴部１の下方部分に座屈変形が発生する虞が生じるため、従来では、このような極薄肉化が行われたシームレス缶は知られていない。
しかるに、本発明のシームレス缶１０は、上記のような極薄肉化が行われていると同時に、１０８０Ｎ以上、特に１２００Ｎ以上の軸荷重強度を示す。これにより、耐座屈性が大きく向上したものとなっている。
上記の軸荷重強度は、後述する実施例で説明されている方法で測定される（図６参照）。
By the way, if extremely thinning is performed to a region close to the forming limit by ironing as described above, the lower portion of the body portion 1 is buckled at the time of neck-in processing, flange processing, double winding at filling, etc. Since there is a possibility that deformation may occur, conventionally, there is no known seamless can in which such extremely thin wall formation has been performed.
However, the seamless can 10 of the present invention exhibits an axial load strength of at least 1080 N, particularly at least 1200 N, at the same time when the above-described ultra-thin-walling is performed. Thereby, the buckling resistance is greatly improved.
The above-mentioned axial load intensity is measured by the method explained in the example mentioned below (refer to Drawing 6).
本発明においては、上記のように大きな軸荷重強度を持たせるため、チャイム部３ｃの近傍での厚みが若干厚肉となるようにしごき加工が行われている。即ち、チャイム部３ｃと胴部１との境界Ｘ１から５ｍｍ上方に位置する部分１ａでの厚み（Ｔ１）が０．１３７〜０．１７７ｍｍの範囲となるように厚み調整しておくことにより、上記のような軸荷重強度を得ることができる。
即ち、このシームレス缶１０に圧縮荷重が加わると、胴部１の厚みが薄くなる程、単位面積当たりの応力が増大し、この結果、チャイム部３ｃが外側に押し広げられやすくなり、この結果、座屈を生じ易くなる。しかるに、本発明では、胴部１が極薄肉化されているにもかかわらず、チャイム部３ｃの近傍での厚みが上記範囲となるように設定されているため、軸荷重強度が高く、耐座屈性が大きく向上している。
In the present invention, in order to give a large axial load strength as described above, ironing is performed so that the thickness in the vicinity of the chime portion 3c becomes slightly thick. That is, the thickness is adjusted so that the thickness (T1) at the portion 1a located 5 mm above the boundary X1 between the chime portion 3c and the trunk portion 1 is in the range of 0.137 to 0.177 mm. Axial load strength such as
That is, when a compressive load is applied to the seamless can 10, the stress per unit area increases as the thickness of the body portion 1 decreases, and as a result, the chime portion 3c is easily spread outward, and as a result, It tends to cause buckling. However, in the present invention, the thickness in the vicinity of the chime portion 3c is set to be in the above range despite the extremely thin body portion 1 and therefore, the axial load strength is high and the seat resistance is high. The tropism is greatly improved.
座屈変形は境界Ｘ１から１５ｍｍ上方近傍を中心として缶胴が菱形形状に凹む現象であり、凹みの下端が境界Ｘ１から５ｍｍ上方近傍である。即ち、境界Ｘ１から５ｍｍ上方に位置する部分１ａ（以下、基準部と略す）の厚み（Ｔ１）を設定しているのは、この基準部１ａが座屈変形を生じるときの曲げ変形部分であり、その厚みが曲げ変形に対する抵抗となり、軸荷重強度に大きな影響を与えるためである。基準部１ａの板厚設定は、しごきパンチの形状及び最終しごきダイ内径を調整することにより、確実に行うことができる。 The buckling deformation is a phenomenon in which the can body is recessed in a rhombic shape centering on the vicinity of 15 mm above the boundary X1, and the lower end of the recess is in the vicinity of 5 mm above the boundary X1. That is, the thickness (T1) of the portion 1a (hereinafter, referred to as a reference portion) located 5 mm above the boundary X1 is a bending deformation portion when the reference portion 1a causes a buckling deformation. The reason is that the thickness thereof is a resistance to bending deformation, which greatly affects the axial load strength. The thickness setting of the reference portion 1a can be reliably performed by adjusting the shape of the ironing punch and the final ironing die inner diameter.
上記基準部１ａよりもチャイム部３に近い領域では、チャイム部３ｃ上端の円形形状効果により曲げ変形への影響が小さく、軸荷重強度と厚みとの相関性が希薄である。また、上記基準部１ａよりもチャイム部３から遠い領域では、凹み下端の曲げ変形への影響が小さく、軸荷重強度と厚みとの相関性が希薄である。 In the region closer to the chime portion 3 than the reference portion 1a, the circular shape effect at the upper end of the chime portion 3c has less influence on bending deformation, and the correlation between axial load strength and thickness is thin. Further, in a region farther from the chime portion 3 than the reference portion 1a, the influence on the bending deformation of the lower end of the dent is small, and the correlation between the axial load strength and the thickness is thin.
また、本発明においては、基準部１ａでの厚み（Ｔ１）が上記範囲内であると共に、最薄肉部Ｙでの厚み（ＴＷ）と前記厚み（Ｔ１）との比（ＴＷ／Ｔ１）が０．４９〜０．６９の範囲にあることが好適である。このように胴部１の厚みを調整することにより、軸方向荷重に対する応力が均等に分散され、局部的な応力集中が回避され、高い軸荷重強度を確保することができる。この範囲を上回ると軽量化が不十分となる虞があり、下回るとしごき加工での破胴が発生する虞がある。 In the present invention, the thickness (T1) of the reference portion 1a is within the above range, and the ratio (TW / T1) of the thickness (TW) of the thinnest portion Y to the thickness (T1) is 0 It is preferable to be in the range of .49 to 0.69. By adjusting the thickness of the body 1 in this manner, the stress to the axial load is uniformly dispersed, local stress concentration is avoided, and high axial load strength can be secured. If it exceeds this range, the weight reduction may be insufficient, and if it is less than this range, there may be a possibility of occurrence of tearing in ironing.
さらに、本発明のシームレス缶１０では、上記のような厚み調整により軸荷重強度が高く設定されていると共に、基準部１ａでのビッカース硬度が９５〜１１５の範囲にある。本発明では、シームレス缶１０の成形に用いるアルミ素材の材質を選定することにより、この基準部１ａでのビッカース硬度を上記範囲に設定することができる。この範囲を上回るとドーミング加工時にチャイム部にシワが発生する虞があり、下回ると軸荷重強度が不足する虞があり、また底部の耐圧強度が不足する虞がある。 Furthermore, in the seamless can 10 of the present invention, the axial load strength is set high by adjusting the thickness as described above, and the Vickers hardness at the reference portion 1a is in the range of 95 to 115. In the present invention, by selecting the material of the aluminum material used for forming the seamless can 10, the Vickers hardness at the reference portion 1a can be set within the above range. If this range is exceeded, wrinkles may be generated in the chime portion during doming processing, and if it is less than this range, the axial load strength may be insufficient, and the pressure resistance at the bottom may be insufficient.
＜アルミシームレス缶１０の製造＞
上記のような形態を有する本発明のアルミシームレス缶１０は、それ自体公知のアルミ製素板を用いての成形加工により製造される。
成形加工により供されるアルミ製素板は、純アルミニウムであってもよいが、アルミニウムと他の金属との合金、例えば、マグネシウムやマンガンなどを含むアルミニウム合金であることが好ましい。特に、本発明では、高い耐圧強度を確保するという観点から、Ｓｉを０．１〜０．４質量％、Ｆｅを０．２８〜０．５０質量％、Ｃｕを０．１５〜０．２５質量％、Ｍｎを０．８〜１．４質量％、Ｍｇを１．０〜１．６質量％程度含むアルミ合金が好適に使用され、より好適にはＳｉを０．１〜０．４質量％、Ｆｅを０．２８〜０．５０質量％、Ｃｕを０．１５〜０．２５質量％、Ｍｎを０．９〜１．４質量％、Ｍｇを１．３〜１．６質量％程度含むアルミ合金が使用される。
このようなアルミ製素板は、必要により、陽極酸化、化成処理、電解処理等によって表面に酸化膜や表面処理皮膜が形成されていてもよい。
また、過酷なしごき成形に対する耐性を確保及び缶体の耐圧強度や軸荷重強度を得るために、この素板は、２０５℃で１０分間の空焼きを行ったあとの引張強度が２８０〜３３０ＭＰａであることが好ましく、かつ空焼き前の引張強度が２９０〜３６０ＭＰａであることが好ましく、２０５℃で１０分間の空焼きを行ったあとの引張強度が２９５〜３２５ＭＰａであり、かつ空焼き前の引張強度が３１０〜３５０ＭＰａであることがより好ましい。この範囲を上回るとしごき成形時に破胴する虞があり、下回ると耐圧強度や軸荷重強度が不足する虞がある。
<Manufacture of aluminum seamless can 10>
The aluminum seamless can 10 of the present invention having the form as described above is manufactured by a forming process using an aluminum base plate known per se.
The aluminum base plate provided by the forming process may be pure aluminum, but is preferably an alloy of aluminum and another metal, for example, an aluminum alloy containing magnesium, manganese or the like. In particular, in the present invention, from the viewpoint of securing a high compressive strength, 0.1 to 0.4 mass% of Si, 0.28 to 0.50 mass% of Fe, and 0.15 to 0.25 mass of Cu. %, An aluminum alloy containing about 0.8 to 1.4 mass% of Mn and about 1.0 to 1.6 mass% of Mg is preferably used, and more preferably 0.1 to 0.4 mass% of Si And 0.28 to 0.50 mass% of Fe, 0.15 to 0.25 mass% of Cu, 0.9 to 1.4 mass% of Mn, and 1.3 to 1.6 mass% of Mg. Aluminum alloy is used.
Such an aluminum base plate may have an oxide film or a surface treatment film formed on its surface by anodization, chemical conversion treatment, electrolytic treatment, etc., if necessary.
In addition, in order to ensure the resistance to severe vacuum forming and to obtain the pressure strength and axial load strength of the can, this base plate has a tensile strength of 280 to 330 MPa after being baked at 205 ° C. for 10 minutes. And the tensile strength before baking is preferably 290 to 360 MPa, the tensile strength after baking for 10 minutes at 205 ° C. is 295 to 325 MPa, and the tensile strength before baking The strength is more preferably 310 to 350 MPa. If it exceeds this range, there is a possibility that the body will be broken at the time of ironing, and if it is less than this range, the pressure resistance strength and the axial load strength may be insufficient.
上記のようなアルミ製素板を用いての成形加工は、通常通り打抜き加工、絞り加工、しごき加工及びドーミング加工により行われ、ドーミング加工後は、適宜、トリミング、洗浄乾燥、外面印刷、仕上げニス塗布焼付、内面塗料塗布焼付、ネックイン加工及びフランジ加工を行うことにより、図１に示す形態の本発明のアルミシームレス缶１０が得られる。 The forming process using the aluminum base plate as described above is carried out by punching, drawing, ironing and doming as usual, and after doming, trimming, washing and drying, outer surface printing, finish varnish are appropriately performed. By performing coating baking, coating inner baking, neck-in processing and flange processing, the aluminum seamless can 10 of the present invention in the form shown in FIG. 1 is obtained.
前述したアルミ製素材からなる素板１１の厚みは、先にも述べたように、図１における底部３の中心部Ｃ０での厚み（Ｔ０）に近い厚みを有するものであり、本発明では、０．２５５〜０．２７５ｍｍにすることによって缶を軽量化してある。 The thickness of the element plate 11 made of the above-mentioned aluminum material, as described above, are those having a thickness close to the thickness (T0) at the center portion C 0 of the bottom portion 3 in FIG. 1, in the present invention The weight of the can is reduced by setting it to 0.255 to 0.275 mm.
かかる素板１１は、図３（ａ）に示す打抜きパンチ１５と打抜きダイ１７による打抜き加工で円板１３を得、図３（ｂ）に示す絞りダイ２１と絞りパンチ２５で絞りカップ（有底筒状体）１９を得、図４に示すリドローダイ３１、複数のしごきダイ３３ａ〜３３ｃとしごきパンチ４３で再絞りしごき加工を行った後、ドーミングダイ３９でドーミング加工を行い、ストリッパフィンガ３５でパンチ４３から引き抜くことによりブランク缶２０が得られる。ドーミング加工時にはチャイム部外面は、チャイム部形成のためホールドダウンリング３７で押さえられる。ドーミング加工によりパンチ４３に接触している缶胴は約３ｍｍチャイム側に引き込まれる。 The blank 11 is obtained by punching using the punching punch 15 and the punching die 17 shown in FIG. 3 (a), and the drawing cup (bottomed) is obtained by the drawing die 21 and the drawing punch 25 shown in FIG. After cylindrical body 19 is obtained, redraw die drawing 31 with redraw die 31 shown in FIG. 4 and a plurality of ironing dies 33a to 33c and ironing punch 43, drawing is performed by doming die 39 and doping with stripper finger 35 The blank can 20 is obtained by pulling out from 43. At the time of doming processing, the outer surface of the chime portion is held by a hold down ring 37 for forming a chime portion. The can body in contact with the punch 43 is drawn to the side of about 3 mm chime by doming processing.
上記のようなしごき加工工程において、図４では、しごきダイが３個配置されており、３段でしごき加工が行われるようになっているが、このしごきダイの数は３個に限定されるものではなく、目的とする薄肉化の程度に応じて、適宜の数とすることができ、１個のダイで１段でのしごき加工とすることもできるし、２またはそれ以上の数のダイを配置して、複数段でのしごき加工とすることができる。勿論、しごきダイを複数個、加工方向に沿って配列し、しごき加工を多段で行う場合には、加工方向下流側にいくにしたがい、その内径（加工径）が小さくなっている。
何れにしろ、本発明のシームレス缶１０を成形するためには、最後のしごきダイ（図４の例ではダイ３３ｃ）の内径が、図１のシームレス缶１０の最薄肉部Ｙでの外径にほぼ相当する。
このようなしごき加工は、先にも述べたように、最薄肉部Ｙでの厚み（ＴＷ）が底部３の中心部Ｃ０での厚み（Ｔ０）の３０〜４２％、特に３５〜４１％の範囲となるように行われる。
In the above-described ironing process, in FIG. 4, three ironing dies are arranged and three-stage ironing is performed, but the number of ironing dies is limited to three. Depending on the intended degree of thinning, the number may be any number, and one die may be ironing in one stage, or two or more dies. Can be placed in a multi-stage ironing process. Of course, in the case where a plurality of ironing dies are arranged along the machining direction and ironing is performed in multiple stages, the inner diameter (machined diameter) of the dies decreases as it goes downstream in the machining direction.
In any case, in order to form the seamless can 10 of the present invention, the inner diameter of the last ironing die (the die 33c in the example of FIG. 4) is equal to the outer diameter at the thinnest portion Y of the seamless can 10 of FIG. It almost corresponds.
Such ironing processing is, as described above, 30-42% of the thickness (T0) at the center C 0 thickness (TW) of the bottom 3 at the thinnest portion Y, in particular 35 to 41% To be in the range of
さらに、本発明のシームレス缶１０を成形するために、上記のパンチ４３は、下方部分が先細形状となっており、このようなパンチ４３を用いてのしごき加工及びドーミング加工により、胴部１の下方部分に前述したテーパー領域Ｚが形成され且つ基準部１ａでの厚みが所定の範囲となるように設定されている。 Furthermore, in order to form the seamless can 10 of the present invention, the lower part of the above-mentioned punch 43 has a tapered shape, and the ironing and doming processes using such a punch 43 make it possible to The tapered region Z described above is formed in the lower portion, and the thickness of the reference portion 1a is set to be within a predetermined range.
図５に示すようにホールドダウンリング３７の内周面は、図１のシームレス缶１０の底部３のチャイム部３ｃ及び接地部３ｂの側面に対応する形状を有している。
また、ドーミングダイ３９の上面は、シームレス缶１０の底部３の中央部分のドーム部３ａに対応する形状を有している。
As shown in FIG. 5, the inner circumferential surface of the hold down ring 37 has a shape corresponding to the side surface of the chime portion 3c and the ground portion 3b of the bottom portion 3 of the seamless can 10 of FIG.
The upper surface of the doming die 39 has a shape corresponding to the dome portion 3 a of the central portion of the bottom portion 3 of the seamless can 10.
このようにして図１に示されているシームレス缶１０が有する厚み及び形態が形成されることとなる。
例えば、パンチ４３のチャイム部及びその近傍相当部形状としごきダイ３３ｃの内径を調整することにより、境界Ｘ１から５ｍｍ上方の基準部１ａの厚み（Ｔ１）を前述の所定範囲内にし、且つ最薄肉部Ｙの厚み（ＴＷ）と基準部１ａでの厚み（Ｔ１）との比（ＴＷ／Ｔ１）を所定の範囲に調節することができる。
Thus, the thickness and shape of the seamless can 10 shown in FIG. 1 are formed.
For example, the thickness (T1) of the reference portion 1a 5 mm above the boundary X1 is made within the above-mentioned predetermined range by adjusting the inner diameter of the chime portion of the punch 43 and its vicinity corresponding portion and adjusting the inner diameter of the ironing die 33c. The ratio (TW / T1) of the thickness (TW) of the portion Y to the thickness (T1) at the reference portion 1a can be adjusted within a predetermined range.
このようにして得られたブランク缶２０は、次の後工程で、必要により、トリミング、外面印刷、仕上げニス塗布焼付、内面塗料塗布焼付が行われた後、それ自体公知のダイネック加工あるいはロールネック加工等のネックイン加工により、段形状あるいはスムース形状のネックイン部５が形成され、さらに、フランジ加工によりフランジ部７が形成され、図１に示す形態のアルミシームレス缶１０として使用に供される。 The blank can 20 thus obtained is subjected to trimming, outer surface printing, finish varnish coating baking, inner coating coating baking, if necessary, in the next post-process, and then the die neck processing or roll neck which is known per se The neck-in portion 5 having a stepped or smooth shape is formed by neck-in processing such as processing, and further, the flange portion 7 is formed by flange processing, and the aluminum seamless can 10 in the form shown in FIG. .
このような本発明のアルミシームレス缶１０では、前述したしごき加工及びドーミング加工により形状及び厚み調整されているため、ブランク缶２０の時点から軸荷重強度が1０８０Ｎ以上、特に１２００Ｎ以上となっている。 In such an aluminum seamless can 10 of the present invention, since the shape and thickness are adjusted by the above-described ironing and doming, the axial load strength is at least 1080 N, particularly at least 1200 N, from the time of the blank can 20.
本発明のアルミシームレス缶は、胴部壁が極薄肉化されていながら軸荷重強度が高く、耐座屈性が大きく向上しており、ネックイン加工、フランジ加工あるいは充填時の二重巻締加工時等座屈が有効に防止されているため、極薄肉化による軽量化を工業的に実施する上で極めて有用である。 The aluminum seamless can of the present invention has high axial load strength and extremely improved buckling resistance while the body wall is extremely thin, and double-clamping at the time of neck-in processing, flange processing or filling. Since periodical buckling is effectively prevented, it is extremely useful in industrially implementing weight reduction by extremely thinning.
以下の実施例及び比較例において、各種物性の測定は以下の方法により行った。
＜缶肉厚測定方法＞
得られたアルミシームレス缶の測定対象部の缶底中央部、缶胴中央部、及びチャイム部上方近傍を切り出し、樹脂で固定し、断面を切り出し、鏡面に研磨し、該当部の断面について光学顕微鏡と基準スケールを用いて、金属層の厚みを測定した。
測定は、缶胴中心部（Ｃ１）、缶底のドーム中央部（Ｃ０）、及び上記の基準部１ａを測定点とし、それぞれ、厚みＴＷ、Ｔ０、Ｔ１とした。
In the following examples and comparative examples, measurement of various physical properties was performed by the following methods.
<Measurement method of can thickness>
Cut the center of the can bottom, the center of the can body, and the upper part of the chime part of the measurement target part of the obtained aluminum seamless can, fix with resin, cut out the cross section, polish it to a mirror surface, and measure the cross section of the relevant part The thickness of the metal layer was measured using and the reference scale.
Measurement was made into thickness TW, T0, and T1, respectively, with the can barrel central portion (C 1 ), the dome central portion (C 0 ) of the can bottom, and the reference portion 1a described above as measurement points.
＜ビッカース硬度測定方法＞
得られたアルミシームレス缶のチャイム部上方近傍を切り出し、樹脂で固定し、断面を切り出し、鏡面に研磨し、基準部１ａの断面についてＪＩＳ Ｚ２２４４に準じてビッカース硬度（Ｈｖ）を測定した。測定点は基準部１ａである。
<Vickers hardness measurement method>
The upper vicinity of the chime portion of the obtained aluminum seamless can was cut out, fixed with a resin, a cross section was cut out, polished to a mirror surface, and the Vickers hardness (Hv) was measured according to JIS Z2244 for the cross section of the reference portion 1a. The measurement point is the reference part 1a.
＜軸荷重強度の評価＞
得られたアルミシームレス缶の軸荷重強度評価方法を図６に示す。
即ち、図６に示すように、缶１０の開口部に治具１００を挿入し、プレート１１０を介して治具１００の上面と缶底の間に圧縮試験機で荷重をかけ、座屈直前の最大荷重を軸荷重強度とした。
<Evaluation of axial load strength>
The axial load strength evaluation method of the obtained aluminum seamless can is shown in FIG.
That is, as shown in FIG. 6, the jig 100 is inserted into the opening of the can 10, a load is applied between the upper surface of the jig 100 and the can bottom with the compression tester via the plate 110, The maximum load was taken as the axial load strength.
＜缶重量の評価＞
缶重量の評価指標として缶体の金属部分のみの重量を指標とした。即ち、外面印刷、仕上げニス、内面塗料等を設ける前の缶体の重量を測定して、次の評点とした。
○：金属部分重量が１１．０ｇ未満である
×：金属部分重量が１１．０ｇ以上である
<Evaluation of can weight>
The weight of only the metal part of the can body was used as an index for evaluating the can weight. That is, the weight of the can before the application of the outer surface printing, the finishing varnish, the inner surface coating, etc. was measured to obtain the following score.
○: metal part weight is less than 11.0 g ×: metal part weight is 11.0 g or more
＜実施例１＞
組成が、Ｓｉ０．２６質量％、Ｆｅ０．３０質量％、Ｃｕ０．２２質量％、Ｍｎ１．２質量％、Ｍｇ１．３８質量％、残部がアルミニウムであり、厚みが０．２６５ｍｍのアルミニウム合金板を加工用の素板として用意した。この素板の２０５℃、１０分空焼き後の引張り強度（ＪＩＳ Ｚ２２４１、試験片第５号に準拠）は３１５ＭＰａ、空焼き前の引張り強度は３２８ＭＰａであった。
Example 1
Processed is an aluminum alloy sheet having a composition of 0.26% by mass of Si, 0.30% by mass of Fe, 0.22% by mass of Cu, 1.2% by mass of Mn, 1.38% by mass of Mg, and the balance being aluminum. It prepared as a blank for. The tensile strength (JIS Z2241, in accordance with test specimen No. 5) of this sheet after blanking at 205 ° C. for 10 minutes was 315 MPa, and the tensile strength before blanking was 328 MPa.
上記の素板（アルミニウム合金板）を、図３、図４に示す打抜き、絞り、再絞り−しごき（ドーミング加工を含む）、トリミング、洗浄乾燥、外面印刷、仕上げニス塗布焼付、内面塗料塗布焼付、ネックイン加工及びフランジ加工を経て、缶胴内径６６ｍｍ、高さ１２２ｍｍ、開口部内径５５ｍｍの３５０ｍｌ用シームレス缶（絞りしごき缶）を作製した。ネックイン部はダイ加工でスムース形状である。
缶胴形状は、次のとおりである。下記高さは底部の接地部最下端（即ち接地点）からの高さで表示した。
境界Ｘ２高さ：１０３ｍｍ
最薄肉部Ｙ上端高さ：９９ｍｍ
最薄肉部Ｙと第１テーパー領域の境界Ｋ１高さ：４０ｍｍ
第１テーパー領域と第２テーパー領域の境界Ｋ２高さ：１５ｍｍ
基準部１ａ高さ：１２ｍｍ
境界Ｘ１高さ：７ｍｍ
即ち、缶胴ストレート部長さＨ、最薄肉部長さＹ及びテーパー領域Ｚ長さは、以下の通りである。
缶胴ストレート部長さＨ：９６ｍｍ
最薄肉部長さＹ：５９ｍｍ
テーパー領域Ｚ長さ：３３ｍｍ
（第１テーパー領域長さ：２５ｍｍ、第２テーパー領域長さ：８ｍｍ）
The above-mentioned base plate (aluminum alloy plate) is punched, drawn, redrawn, ironed (including doming) shown in FIG. 3 and FIG. 4, trimming, washing and drying, outer surface printing, finishing varnish coating baking, inner coating coating baking After neck-in processing and flange processing, a 350 ml seamless can (can be drawn and drawn) having an inner diameter of 66 mm, a height of 122 mm and an inner diameter of 55 mm was produced. The neck-in part is die-processed and has a smooth shape.
The shape of the can body is as follows. The following height is represented by the height from the lowermost end (ie, the ground contact point) of the bottom portion.
Boundary X2 height: 103 mm
Thinnest section Y upper end height: 99 mm
Boundary K1 height of the thinnest portion Y and the first taper area: 40 mm
Boundary K2 height between the first taper area and the second taper area: 15 mm
Reference part 1a height: 12 mm
Boundary X1 height: 7 mm
That is, the can body straight portion length H, the thinnest portion length Y, and the tapered region Z length are as follows.
Can body straight length H: 96 mm
Thinnest part length Y: 59 mm
Taper area Z length: 33 mm
(First taper area length: 25 mm, second taper area length: 8 mm)
また、しごき加工のパンチ４３の形状、及び最終しごきダイ内径調整により、表１に示すように、底部３の中心部（Ｃ０）での厚み（Ｔ０）、缶胴最薄肉部厚み（ＴＷ）と基準部１ａの厚み（Ｔ１）、（ＴＷ／Ｔ１）比となるように設定した。テーパー領域Ｚにおいて、境界Ｋ２部厚みは、最薄肉部厚みＴＷよりも０．０２４ｍｍ厚くした。
得られたシームレス缶について軸荷重強度、基準部１ａでのビッカース硬度を測定し、結果を表１に示した。
Also, as shown in Table 1, the thickness (T0) at the center (C0) of the bottom 3 and the thickness (TW) of the can body thinnest part as shown in Table 1 due to the shape of the punch 43 and the final ironing die inner diameter adjustment. It set so that it might become thickness (T1) of the reference | standard part 1a and (TW / T1) ratio. In the tapered region Z, the thickness of the boundary K2 portion is 0.024 mm greater than the thickness of the thinnest portion TW.
The axial load strength and the Vickers hardness at the reference portion 1 a of the obtained seamless can were measured, and the results are shown in Table 1.
＜実施例２＞
素板として用いるアルミニウム合金板の組成を、Ｓｉ０．３２質量％、Ｆｅ０．４３質量％、Ｃｕ０．２０質量％、Ｍｎ０．８７質量％、Ｍｇ１．０９質量％に変更し、２０５℃１０分空焼き後の引張り強度が２８４ＭＰａ、空焼き前の引張り強度が３０１ＭＰａの合金板を素板として用いた以外は、実施例１と同様にしてシームレス缶を作製し、軸荷重強度及びビッカース硬度の測定を行った。結果を表１に示す。
Example 2
The composition of the aluminum alloy plate used as the base plate is changed to 0.32 mass% of Si, 0.43 mass% of Fe, 0.20 mass% of Cu, 0.87 mass% of Mn, 1.09 mass% of Mg, and baked at 205 ° C. for 10 minutes. A seamless can was produced in the same manner as in Example 1 except that an alloy plate having a tensile strength of 284 MPa later and a tensile strength before blanking of 301 MPa was used as an element plate, and the axial load strength and Vickers hardness were measured. The The results are shown in Table 1.
＜実施例３＞
しごきパンチ４３の先端近傍形状としごきダイ内径を変更し、基準部１ａでの厚みＴ１を０．１７７ｍｍ、ＴＷを０．０８７ｍｍに変更した以外は実施例１と同様にしてシームレス缶を作製し、軸荷重強度及びビッカース硬度の測定を行った。結果を表１に示す。
Example 3
A seamless can is produced in the same manner as in Example 1 except that the shape near the tip of the ironing punch 43 and the inner diameter of the ironing die are changed, the thickness T1 at the reference portion 1a is changed to 0.177 mm, and the TW is changed to 0.087 mm. The axial load strength and Vickers hardness were measured. The results are shown in Table 1.
＜実施例４＞
しごきパンチ４３の先端近傍形状としごきダイ内径を変更し、基準部１ａでの厚みＴ１を０．１３７ｍｍ、ＴＷを０．０９４ｍｍに変更した以外は実施例１と同様にしてシームレス缶を作製し、軸荷重強度及びビッカース硬度の測定を行った。結果を表１に示す。
Example 4
A seamless can is produced in the same manner as in Example 1 except that the shape near the tip of the ironing punch 43 and the inner diameter of the ironing die are changed, the thickness T1 at the reference portion 1a is changed to 0.137 mm, and the TW is changed to 0.094 mm. The axial load strength and Vickers hardness were measured. The results are shown in Table 1.
＜実施例５＞
素板として用いるアルミニウム合金板の厚みを０．２５５ｍｍに変更し、かつしごきパンチ４３の先端近傍形状としごきダイ内径を変更して基準部１ａでの厚みＴ１を０．１５７ｍｍ、ＴＷを０．０８８ｍｍに変更した以外は実施例１と同様にしてシームレス缶を作製し、軸荷重強度及びビッカース硬度の測定を行った。結果を表１に示す。
Example 5
The thickness of the aluminum alloy plate used as the base plate is changed to 0.255 mm, and the shape near the tip of the ironing punch 43 and the inner diameter of the ironing die are changed to make the thickness T1 at the reference portion 1a 0.157 mm, TW 0.088 mm A seamless can was produced in the same manner as in Example 1 except that it was changed to and the axial load strength and Vickers hardness were measured. The results are shown in Table 1.
＜実施例６＞
素板として用いるアルミニウム合金板の厚みを０．２７５ｍｍに変更し、かつしごきパンチ４３の先端近傍形状としごきダイ内径を変更して基準部１ａでの厚みＴ１を０．１５７ｍｍ、ＴＷを０．０９８ｍｍに変更した以外は実施例１と同様にしてシームレス缶を作製し、軸荷重強度及びビッカース硬度の測定を行った。結果を表１に示す。
Example 6
The thickness of the aluminum alloy plate used as the blank is changed to 0.275 mm, and the shape near the tip of the ironing punch 43 and the inner diameter of the ironing die are changed to make the thickness T1 at the reference portion 1a 0.157 mm, TW 0.098 mm A seamless can was produced in the same manner as in Example 1 except that it was changed to and the axial load strength and Vickers hardness were measured. The results are shown in Table 1.
＜比較例１＞
しごきパンチ４３の先端近傍形状としごきダイ内径を変更し、基準部１ａでの厚みＴ１を０．１３２ｍｍ、ＴＷを０．０９６ｍｍに変更した以外は実施例２と同様にしてシームレス缶を作製し、軸荷重強度及びビッカース硬度の測定を行った。結果を表１に示す。
Comparative Example 1
A seamless can is produced in the same manner as in Example 2 except that the shape near the tip of the ironing punch 43 and the inner diameter of the ironing die are changed, the thickness T1 at the reference portion 1a is changed to 0.132 mm, and the TW is changed to 0.096 mm. The axial load strength and Vickers hardness were measured. The results are shown in Table 1.
＜比較例２＞
しごきパンチ４３の先端近傍形状としごきダイ内径を変更し、基準部１ａでの厚みＴ１を０．１３２ｍｍ、ＴＷを０．０９６ｍｍに変更した以外は実施例１と同様にしてシームレス缶を作製し、軸荷重強度及びビッカース硬度の測定を行った。結果を表１に示す。
Comparative Example 2
A seamless can is produced in the same manner as in Example 1 except that the shape near the tip of the ironing punch 43 and the inner diameter of the ironing die are changed, the thickness T1 at the reference portion 1a is changed to 0.132 mm, and the TW is changed to 0.096 mm. The axial load strength and Vickers hardness were measured. The results are shown in Table 1.
＜比較例３＞
素板として用いるアルミニウム合金板の組成を、Ｓｉ０．３２質量％、Ｆｅ０．４３質量％、Ｃｕ０．２０質量％、Ｍｎ０．８７質量％、Ｍｇ１．０９質量％で、２０５℃１０分空焼き後引張り強度が２８４ＭＰａ、空焼き前引張り強度が３０１ＭＰａで、板厚０．２９０ｍｍに変更し、しごきパンチ４３の先端近傍形状としごきダイ内径を変更し、Ｔ１が０．１４５ｍｍ、ＴＷが０．１０５ｍｍ、境界Ｋ２部厚みが最薄肉部厚みＴＷよりも０．０１７ｍｍ厚くした以外は実施例１と同様にしてシームレス缶を作製し、軸荷重強度及びビッカース硬度の測定を行った。結果を表１に示す。
Comparative Example 3
The composition of the aluminum alloy plate used as the blank is 0.32 mass% of Si, 0.43 mass% of Fe, 0.20 mass% of Cu, 0.87 mass% of Mn, 1.09 mass% of Mg, and after tensile baking at 205 ° C. for 10 minutes The strength is 284MPa, the tensile strength before blanking is 301MPa, the plate thickness is changed to 0.290mm, the shape near the tip of the ironing punch 43 and the inner diameter of the ironing die are changed, T1 is 0.145mm, TW is 0.105mm, the boundary A seamless can was produced in the same manner as in Example 1 except that the K2 part thickness was 0.017 mm thicker than the thinnest part thickness TW, and the axial load strength and Vickers hardness were measured. The results are shown in Table 1.
１：胴部
３：底部
３ａ：ドーム部
３ｂ：接地部
３ｃ：チャイム部
５：ネックイン部
７：フランジ部
１０：アルミシームレス缶
Ｙ：最薄肉部
Ｚ：テーパー領域
２０：ブランク缶
1: Body 3: Bottom 3a: Dome 3b: Ground 3c: Chime 5: Neck in 7 7: Flange 10 10: Aluminum Seamless Can Y: Thinnest portion Z: Taper area 20: Blank can
Claims (4)
前記底部が、中央部に位置する上方に膨らんだドーム部と、該ドーム部周縁から降下した接地部と、該接地部から外方かつ上方に傾斜して延びて前記胴部下端に連なるチャイム部とからなり、
前記ドーム部の中心厚み（Ｔ０）が０．２４５〜０．２６５ｍｍの範囲にあり、
前記胴部における最薄肉部の厚み（ＴＷ）が、前記ドーム部の中心厚み（Ｔ０）の３０〜４２％の範囲にあり、かつ該最薄肉部が胴部長さの少なくとも５０％以上にわたって存在しており、
前記チャイム部と前記胴部との境界Ｘ１から５ｍｍ上方に位置する基準部での胴部厚み（Ｔ１）が０．１３７〜０．１７７ｍｍの範囲にあることを特徴とするアルミシームレス缶。 In an aluminum seamless can having a bottom and a thin-walled body,
The bottom portion includes an upwardly expanding dome portion located at a central portion, a ground portion lowered from the periphery of the dome portion, and a chime portion extending outward and upward from the ground portion and extending to the lower end of the trunk portion. Consists of
The center thickness (T0) of the dome portion is in the range of 0.245 to 0.265 mm,
The thickness (TW) of the thinnest portion of the trunk portion is in the range of 30 to 42% of the central thickness (T0) of the dome portion, and the thinnest portion exists over at least 50% or more of the trunk length. Yes,
An aluminum seamless can characterized in that a body thickness (T1) at a reference portion located 5 mm above the boundary X1 between the chime portion and the body portion is in the range of 0.137 to 0.177 mm.
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| WO2023195220A1 (en) * | 2022-04-04 | 2023-10-12 | 東洋製罐株式会社 | Bottomed metal cylinder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1085873A (en) * | 1996-09-11 | 1998-04-07 | Daiwa Can Co Ltd | Aluminum di shear spun can with rugged pattern in body part, and its manufacture |
| JP2005335726A (en) * | 2004-05-25 | 2005-12-08 | Daiwa Can Co Ltd | Bottle-shaped can manufacturing method |
| JP2009292480A (en) * | 2008-06-02 | 2009-12-17 | Universal Seikan Kk | Aluminum can |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1085873A (en) * | 1996-09-11 | 1998-04-07 | Daiwa Can Co Ltd | Aluminum di shear spun can with rugged pattern in body part, and its manufacture |
| JP2005335726A (en) * | 2004-05-25 | 2005-12-08 | Daiwa Can Co Ltd | Bottle-shaped can manufacturing method |
| JP2009292480A (en) * | 2008-06-02 | 2009-12-17 | Universal Seikan Kk | Aluminum can |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023195220A1 (en) * | 2022-04-04 | 2023-10-12 | 東洋製罐株式会社 | Bottomed metal cylinder |
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