JP2018099710A - DI can and bottle can - Google Patents

DI can and bottle can Download PDF

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JP2018099710A
JP2018099710A JP2016246846A JP2016246846A JP2018099710A JP 2018099710 A JP2018099710 A JP 2018099710A JP 2016246846 A JP2016246846 A JP 2016246846A JP 2016246846 A JP2016246846 A JP 2016246846A JP 2018099710 A JP2018099710 A JP 2018099710A
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axis
thickness
wall
bottle
flange portion
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鎌田　元彦
Motohiko Kamata
元彦 鎌田
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Altemira Can Co Ltd
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Universal Can Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a DI can in which weight saving of a can body is achieved and molding failure during DI processing can be suppressed, and a bottle can which is manufactured based on the DI can.SOLUTION: A bottomed cylindrical DI can W2 includes a can body 3 and a can bottom 2. The can body 3 comprises: a flange part 9 which is arranged at an opening end part 4 of the can body 3; a wall part 10 which is arranged in the can bottom 2 side along a can axis C direction in comparison with the flange part 9 and an inner diameter of which is larger than that of the flange part 9; and a taper part 11 which is along the can axis C direction between the flange part 9 and the wall part 10, and an inner diameter of which gradually increases along the can axis C direction from the flange part 9 to the wall part 10. A length L of the taper part 11 in the can axis C direction is 25-40 mm.SELECTED DRAWING: Figure 4

Description

本発明は、ＤＩ缶及びボトル缶に関する。   The present invention relates to a DI can and a bottle can.

従来、例えば下記特許文献１に示されるようなボトル缶が知られている。
ボトル缶は、アルミニウム合金材料等の圧延材（板材）を打ち抜き加工して円板状のブランクとし、該ブランクにカッピング加工を施してカップ状体とし、該カップ状体にＤＩ加工（絞りしごき加工）を施して有底筒状のＤＩ缶とし、該ＤＩ缶にネッキング加工、ねじ成形加工、カール加工、スロットル加工等を施すことによりボトル状に製缶される。なお、「ＤＩ」とはＤｒａｗｉｎｇ＆Ｉｒｏｎｉｎｇの略称である。
ボトル缶には、飲料等の内容物が充填され、その開口端部にキャップが取り付けられて密封される。 Conventionally, for example, a bottle can as shown in Patent Document 1 below is known.
The bottle can is made by punching a rolled material (plate material) such as an aluminum alloy material into a disk-shaped blank, cupping the blank to form a cup-shaped body, and DI processing (squeezing and ironing on the cup-shaped body) ) To form a bottomed cylindrical DI can, and the DI can is made into a bottle by performing necking processing, screw forming processing, curling processing, throttle processing, and the like. “DI” is an abbreviation for “Drawing & Ironing”.
The bottle can is filled with contents such as a beverage, and a cap is attached to the opening end of the bottle can to seal it.

ボトル缶の中間成形体（缶基体）であるＤＩ缶は、缶胴と缶底とを備えている。缶胴は円筒状をなしており、缶胴の外周面は、缶軸方向の全長にわたって一定の外径に形成されている。缶胴は、缶胴の開口端部に配置されたフランジ部と、フランジ部よりも缶軸方向に沿う缶底側に配置され、フランジ部よりも内径が大きいウォール部と、缶軸方向に沿うフランジ部とウォール部との間に配置された段部と、を備えている（下記特許文献１の図３０を参照）。つまり缶胴のフランジ部は、ウォール部に比べて肉厚が大きくされていて、これにより缶胴の開口端部における強度や成形性が確保されている。   A DI can which is an intermediate molded body (can base body) of a bottle can includes a can body and a can bottom. The can body has a cylindrical shape, and the outer peripheral surface of the can body is formed with a constant outer diameter over the entire length in the can axis direction. The can body is disposed at the opening end of the can body, on the can bottom side along the can axis direction than the flange portion, the wall portion having an inner diameter larger than the flange portion, and along the can axis direction. A step portion disposed between the flange portion and the wall portion (see FIG. 30 of Patent Document 1 below). In other words, the flange portion of the can body is thicker than the wall portion, thereby ensuring the strength and formability at the open end of the can body.

ところで近年、ＣＯ２排出量削減等環境保護の観点から、使用する原材料の削減による、アルミニウム缶の軽量化の要請が強くなっている。具体的には、０．１ｇ以上（約１％以上）の缶重量削減を目指した軽量缶の開発が必要とされている。一缶あたり、０．１ｇの削減でも、アルミニウム缶市場年間１８０億缶に適用できれば、大きな環境負荷低減が達成できる。 By the way, in recent years, from the viewpoint of environmental protection such as CO 2 emission reduction, there is an increasing demand for weight reduction of aluminum cans by reducing raw materials used. Specifically, development of a lightweight can aimed at reducing the weight of a can of 0.1 g or more (about 1% or more) is required. Even with a reduction of 0.1 g per can, if it can be applied to 18 billion cans per year in the aluminum can market, a significant reduction in environmental impact can be achieved.

特開２００６−６２７５５号公報JP 2006-62755 A

従来のＤＩ缶は、下記の課題を有していた。
缶胴を軽量化するには、フランジ部の肉厚を維持したままウォール部の肉厚を薄くすることが好ましい。しかしながらこの場合、フランジ部とウォール部との間の段差（内径差）が大きくなり、ＤＩ加工時に使用されるパンチが、缶胴を成形した後にフランジ部とウォール部との間の段部に引っ掛かって抜けにくくなったり、缶胴を均一にしごき加工できなくなったりして、座屈や肉欠け（缶軸回りに均一にしごき加工できない現象）等の成形不良が生じやすくなる。 Conventional DI cans have the following problems.
In order to reduce the weight of the can body, it is preferable to reduce the thickness of the wall portion while maintaining the thickness of the flange portion. However, in this case, the step (inner diameter difference) between the flange portion and the wall portion becomes large, and the punch used at the time of DI processing is caught on the step portion between the flange portion and the wall portion after the can body is formed. This makes it difficult to pull out, or makes the can body uniform and cannot be ironed, and tends to cause molding defects such as buckling and chipping (a phenomenon that cannot be ironed uniformly around the can axis).

本発明は、このような事情に鑑みてなされたものであって、缶胴を軽量化しつつも、ＤＩ加工時の成形不良を抑制できるＤＩ缶及び該ＤＩ缶を基に製造されたボトル缶を提供することを目的としている。   The present invention has been made in view of such circumstances, and a DI can that can suppress molding defects during DI processing and a bottle can manufactured based on the DI can while reducing the weight of the can body. It is intended to provide.

本発明の一態様は、缶胴と缶底とを備えた有底筒状のＤＩ缶であって、前記缶胴は、前記缶胴の開口端部に配置されたフランジ部と、前記フランジ部よりも缶軸方向に沿う前記缶底側に配置され、前記フランジ部よりも内径が大きいウォール部と、缶軸方向に沿う前記フランジ部と前記ウォール部との間に配置され、缶軸方向に沿って前記フランジ部から前記ウォール部に向かうに従い徐々に内径が大きくなるテーパー部と、を備え、前記テーパー部の缶軸方向の長さが、２５〜４０ｍｍであることを特徴とする。
また本発明の一態様は、上述のＤＩ缶から製缶されたボトル缶であって、前記缶胴に、缶軸方向に沿って前記缶底から前記開口端部側へ向かうに従い徐々に縮径するネック部と、前記ネック部の前記開口端部側に隣接配置され、ねじ成形部が形成された口金部と、を備えたことを特徴とする。 One aspect of the present invention is a bottomed cylindrical DI can having a can body and a can bottom, wherein the can body includes a flange portion disposed at an open end of the can body, and the flange portion. Is disposed on the bottom side of the can along the can axis direction, and is disposed between the wall portion having a larger inner diameter than the flange portion, the flange portion and the wall portion along the can axis direction, and in the can axis direction. And a taper portion having an inner diameter that gradually increases from the flange portion toward the wall portion. The length of the taper portion in the can axis direction is 25 to 40 mm.
Moreover, one aspect of the present invention is a bottle can made from the above-mentioned DI can, and gradually decreases in diameter toward the opening end side from the can bottom along the can axis direction to the can body. And a base portion that is arranged adjacent to the opening end portion side of the neck portion and has a screw forming portion.

本発明のＤＩ缶及び該ＤＩ缶を基に製造されたボトル缶によれば、ＤＩ缶の缶胴におけるフランジ部とウォール部との間に、缶軸方向に沿ってフランジ部からウォール部に向かうに従い徐々に内径が大きくなるテーパー部が形成されている。そして、テーパー部の缶軸方向に沿う長さが、２５〜４０ｍｍであるので、下記の作用効果を奏する。   According to the DI can of the present invention and the bottle can manufactured based on the DI can, the flange portion and the wall portion in the can body of the DI can are directed from the flange portion to the wall portion along the can axis direction. Accordingly, a tapered portion whose inner diameter gradually increases is formed. And since the length along the can axis direction of a taper part is 25-40 mm, there exists the following effect.

すなわち、テーパー部の缶軸方向の長さが２５ｍｍ以上であるので、このテーパー部の缶軸に対する傾斜が緩やかとなり、ＤＩ加工時に缶胴を絞りしごき加工したパンチが、テーパー部に引っ掛かることなく抜けやすい。また、パンチによって缶胴を均一にしごき加工しやすくなる。従って、たとえウォール部の肉厚を薄くして缶胴を軽量化しても、缶胴に座屈や肉欠け等の成形不良を生じにくくすることができる。
また、テーパー部の缶軸方向の長さが４０ｍｍ以下であるので、上述したテーパー部による作用効果を奏しつつも、薄肉とされたウォール部の缶軸方向の長さを十分に大きく確保して、缶胴の軽量化を確実に図ることができる。 That is, since the length of the taper portion in the can axis direction is 25 mm or more, the inclination of the taper portion with respect to the can shaft becomes gentle, and the punch obtained by squeezing and squeezing the can body during DI processing is pulled out without being caught by the taper portion. Cheap. In addition, the can body is made uniform by punching and easy to iron. Therefore, even if the thickness of the wall portion is reduced to reduce the weight of the can body, it is possible to make it difficult to cause molding defects such as buckling and chipping in the can body.
In addition, since the length of the tapered portion in the can axis direction is 40 mm or less, the length of the thin wall portion in the can axis direction is secured sufficiently large while achieving the above-described effects of the tapered portion. The can body can be reliably reduced in weight.

以上より本発明によれば、缶胴を軽量化しつつも、ＤＩ加工時の成形不良を抑制できる。   As described above, according to the present invention, it is possible to suppress molding defects during DI processing while reducing the weight of the can body.

また、上記ＤＩ缶において、前記フランジ部と前記ウォール部との肉厚差が、０．０９０ｍｍ以上であることが好ましい。   In the DI can, it is preferable that a thickness difference between the flange portion and the wall portion is 0.090 mm or more.

この場合、フランジ部とウォール部との肉厚差が０．０９０ｍｍ以上であるので、その分、ウォール部の肉厚を薄くして、缶の軽量化を図ることができる。なお、好ましくは、前記肉厚差は０．１ｍｍ以上であり、さらに好ましくは、前記肉厚差は０．１２０ｍｍ以上である。   In this case, since the thickness difference between the flange portion and the wall portion is 0.090 mm or more, the thickness of the wall portion can be reduced correspondingly to reduce the weight of the can. In addition, Preferably, the said thickness difference is 0.1 mm or more, More preferably, the said thickness difference is 0.120 mm or more.

また、上記ＤＩ缶において、前記ウォール部の肉厚が、０．１ｍｍ以下であることが好ましい。   In the DI can, the wall portion preferably has a wall thickness of 0.1 mm or less.

この場合、ウォール部の肉厚が０．１ｍｍ以下と確実に薄くされて、缶が軽量化される。   In this case, the wall thickness is reliably reduced to 0.1 mm or less, and the can is reduced in weight.

また、上記ＤＩ缶において、前記缶底の肉厚が、０．３１ｍｍ以下であることが好ましい。   In the DI can, the thickness of the bottom of the can is preferably 0.31 mm or less.

この場合、ブランクの元板厚が維持される缶底の肉厚が０．３１ｍｍ以下と確実に薄くされて、缶を効果的に軽量化できる。   In this case, the thickness of the bottom of the can in which the original plate thickness of the blank is maintained is reliably reduced to 0.31 mm or less, and the can can be effectively reduced in weight.

本発明のＤＩ缶及び該ＤＩ缶を基に製造されたボトル缶によれば、缶胴を軽量化しつつも、ＤＩ加工時の成形不良を抑制できる。   According to the DI can of the present invention and the bottle can manufactured based on the DI can, it is possible to suppress molding defects during DI processing while reducing the weight of the can body.

本発明の一実施形態に係るボトル缶の一例を示す半縦断面図である。It is a half longitudinal section showing an example of a bottle can concerning one embodiment of the present invention. ボトル缶の製造方法を説明するフローチャートである。It is a flowchart explaining the manufacturing method of a bottle can. ボトル缶の製造工程における缶の形状の変化を説明する図である。It is a figure explaining the change of the shape of the can in the manufacturing process of a bottle can. ボトル缶となる缶基体のＤＩ缶を示す縦断面図である。It is a longitudinal cross-sectional view which shows DI can of the can base | substrate used as a bottle can.

以下、本発明の一実施形態に係るボトル缶１及びその中間成形体（缶基体）であるＤＩ缶Ｗ２について、図面を参照して説明する。なお、本実施形態の説明に用いる図面は、本発明の特徴をわかりやすくするために、要部となる部分を拡大、強調、抜粋して示している場合があり、各構成要素の寸法比率などが実際のものと同じであるとは限らない。   Hereinafter, a bottle can 1 according to an embodiment of the present invention and a DI can W2 that is an intermediate molded body (can base body) thereof will be described with reference to the drawings. Note that the drawings used in the description of the present embodiment may show enlarged, emphasized, and excerpted portions that are essential parts in order to make the features of the present invention easier to understand. Is not always the same as the actual one.

図１に示されるように、ボトル缶１は有底筒状をなしており、缶の周壁である缶胴３と、缶の底壁である缶底２と、を備えている。缶胴３の中心軸及び缶底２の中心軸は、互いに同軸に配置されており、本実施形態ではこれらの共通軸を缶軸Ｃという。
また、缶軸Ｃが延在する方向（缶軸Ｃに沿う方向）を缶軸Ｃ方向という。缶軸Ｃ方向のうち、缶底２から缶胴３の開口端部４側へ向かう方向を上方といい、開口端部４から缶底２側へ向かう方向を下方という。
また、缶軸Ｃに直交する方向を径方向という。径方向のうち、缶軸Ｃに接近する向きを径方向の内側といい、缶軸Ｃから離間する向きを径方向の外側という。
また、缶軸Ｃ回りに周回する方向を周方向という。 As shown in FIG. 1, the bottle can 1 has a bottomed cylindrical shape, and includes a can body 3 that is a peripheral wall of the can and a can bottom 2 that is a bottom wall of the can. The central axis of the can body 3 and the central axis of the can bottom 2 are arranged coaxially with each other. In the present embodiment, these common axes are referred to as a can axis C.
The direction in which the can axis C extends (the direction along the can axis C) is referred to as the can axis C direction. Of the can axis C direction, the direction from the can bottom 2 toward the opening end 4 of the can body 3 is referred to as “upper”, and the direction from the opening end 4 toward the can bottom 2 is referred to as “down”.
A direction perpendicular to the can axis C is referred to as a radial direction. Of the radial directions, the direction approaching the can axis C is referred to as the inside in the radial direction, and the direction away from the can axis C is referred to as the outside in the radial direction.
Further, a direction around the can axis C is referred to as a circumferential direction.

缶胴３は、その開口端部４以外の部位に形成された胴部５と、開口端部４に形成されたネック部６及び口金部７と、を備える。
胴部５は、缶軸Ｃ方向に沿って略一定の外径とされた円筒状をなしており、缶胴３における最大径部分である。ネック部６は、胴部５の上方に隣接配置されており、缶軸Ｃ方向に沿って缶底２から開口端部４側（つまり上方）へ向かうに従い徐々に縮径して形成されている。口金部７は、ネック部６の上方に隣接配置されており、ねじ成形部８が形成されている。口金部７は、缶胴３における最小径部分である。 The can body 3 includes a body portion 5 formed at a portion other than the opening end portion 4, and a neck portion 6 and a base portion 7 formed at the opening end portion 4.
The body portion 5 has a cylindrical shape with a substantially constant outer diameter along the can axis C direction, and is the maximum diameter portion in the can body 3. The neck portion 6 is disposed adjacent to the upper portion of the body portion 5, and is formed with a diameter gradually reduced from the can bottom 2 toward the opening end portion 4 side (that is, upward) along the can axis C direction. . The base portion 7 is disposed adjacent to the upper portion of the neck portion 6, and a screw forming portion 8 is formed. The base portion 7 is a minimum diameter portion in the can body 3.

缶底２は、缶軸Ｃ方向に沿って缶底２から開口端部４側（上方）へ向けて窪むドーム部２ａと、ドーム部２ａの外周縁部に連なり、缶軸Ｃ方向に沿って開口端部４から缶底２側（下方）へ向けて突出するとともに周方向に延びる環状凸部（リム）２ｂと、を備える。環状凸部２ｂは、缶底２において最も下方に突出するノーズ部（接地部）と、ノーズ部の径方向の内側に位置する内周壁（インナーウォール）と、ノーズ部の径方向の外側に位置する外周壁（アウターウォール）と、を備える。   The can bottom 2 is connected to the dome portion 2a that is recessed from the can bottom 2 toward the opening end 4 side (upward) along the can axis C direction, and the outer peripheral edge of the dome portion 2a, and extends along the can axis C direction. And an annular convex portion (rim) 2b that protrudes from the open end 4 toward the can bottom 2 side (downward) and extends in the circumferential direction. The annular convex portion 2b is located on the outer side of the nose portion (inner wall) positioned on the radially inner side of the nose portion, a nose portion (grounding portion) that protrudes downward in the can bottom 2, and a radially inner side of the nose portion An outer peripheral wall (outer wall).

次に、ボトル缶１の製造工程の一例について説明する。
図２に示されるように、ボトル缶１は、板材打ち抜き工程Ｓ０１、カッピング工程（絞り工程）Ｓ０２、ＤＩ工程（絞りしごき工程）Ｓ０３、トリミング工程Ｓ０４、印刷・塗装（缶外面）工程Ｓ０５、塗装（缶内面）工程Ｓ０６、ネッキング工程Ｓ０７、トリミング工程Ｓ０８、ねじ成形工程Ｓ０９、カール工程Ｓ１０及びスロットル工程Ｓ１１等を経て、製缶される。 Next, an example of the manufacturing process of the bottle can 1 will be described.
As shown in FIG. 2, the bottle can 1 includes a plate blanking process S01, a cupping process (drawing process) S02, a DI process (drawing and ironing process) S03, a trimming process S04, a printing / painting (can outer surface) process S05, and a coating process. (Can inner surface) The can is manufactured through a process S06, a necking process S07, a trimming process S08, a screw forming process S09, a curling process S10, a throttle process S11, and the like.

板材打ち抜き工程Ｓ０１では、アルミニウム合金材料等からなる圧延材（板材）を打ち抜き加工して、図３（ａ）に示されるような、円板状のブランクＷ０を成形する。
カッピング工程（絞り工程）Ｓ０２では、ブランクＷ０をカッピングプレスによって絞り加工（カッピング加工）して、図３（ｂ）に示されるようなカップ状体Ｗ１に成形する。 In the plate material punching step S01, a rolled material (plate material) made of an aluminum alloy material or the like is punched to form a disk-shaped blank W0 as shown in FIG.
In the cupping step (drawing step) S02, the blank W0 is drawn (capping) by a cupping press and formed into a cup-like body W1 as shown in FIG.

ＤＩ工程（絞りしごき工程）Ｓ０３では、ＤＩ缶製造装置によってカップ状体Ｗ１に再絞り及びしごき加工を施して、図３（ｃ）に示されるように、缶胴３と缶底２とを備えた有底円筒状のＤＩ缶Ｗ２を成形する。特に図示していないが、ＤＩ缶製造装置は、往復直線運動機構と、往復直線運動機構にラム軸等を介して接続されるパンチと、パンチが挿通される貫通孔が形成された複数のダイスと、最前端のダイスの端面に配置したカップ状体Ｗ１内に挿入され、該カップ状体Ｗ１の底壁を前記端面に押し付けて固定するカップホルダースリーブと、を備えている。
またＤＩ工程Ｓ０３において、缶底２には、ドーム部２ａと環状凸部２ｂとが成形される。 In the DI step (drawing and squeezing step) S03, the cup-shaped body W1 is re-drawn and squeezed by a DI can manufacturing apparatus, and as shown in FIG. 3 (c), a can body 3 and a can bottom 2 are provided. A bottomed cylindrical DI can W2 is formed. Although not specifically illustrated, the DI can manufacturing apparatus includes a reciprocating linear motion mechanism, a punch connected to the reciprocating linear motion mechanism via a ram shaft, and a plurality of dies formed with through holes through which the punch is inserted. And a cup holder sleeve that is inserted into the cup-shaped body W1 disposed on the end face of the frontmost die and presses and fixes the bottom wall of the cup-shaped body W1 against the end face.
In the DI step S03, the dome portion 2a and the annular convex portion 2b are formed on the can bottom 2.

ＤＩ工程Ｓ０３を経たＤＩ缶Ｗ２は、缶胴３の開口端部４に耳が形成されていて高さが不均一であるので、トリミング工程Ｓ０４において、トリミング装置を用いて開口端部４のトリミング加工を行い、図３（ｄ）に示されるように、缶胴３の開口端部４の高さが全周にわたって均等に揃えられたＤＩ缶Ｗ２とする。   Since the DI can W2 that has undergone the DI process S03 has ears formed at the opening end 4 of the can body 3 and has a non-uniform height, the trimming of the opening end 4 is performed using a trimming device in the trimming process S04. Processing is performed to obtain a DI can W2 in which the height of the opening end 4 of the can body 3 is evenly aligned over the entire circumference as shown in FIG.

次いで、ＤＩ缶Ｗ２を洗浄して油分等を除去した後に、表面処理を施して乾燥し、ＤＩ缶Ｗ２の外面の印刷及び塗装を行い（印刷・塗装（缶外面）工程Ｓ０５）、ＤＩ缶Ｗ２の内面の塗装を行う（塗装（缶内面）工程Ｓ０６）ことにより、図３（ｅ）に示されるようなＤＩ缶Ｗ２とする。   Next, after the DI can W2 is washed to remove oil and the like, it is subjected to surface treatment and dried, and the outer surface of the DI can W2 is printed and coated (printing / coating (can outer surface) step S05). Is applied to the inner surface (coating (can inner surface) step S06), thereby obtaining a DI can W2 as shown in FIG.

このＤＩ缶Ｗ２を、ボトル缶製造装置に移送する。ボトル缶製造装置では、複数種類のダイ加工ツール（ネッキング成形金型）を用いて、缶胴３の開口端部４及びその近傍に段階的にダイ加工（ネッキング加工）を施すことにより、ネック部６及び口金部７を成形する（ネッキング工程Ｓ０７）。また必要に応じて、複数種類のダイ加工同士の間に、トリミング加工ツールを用いて、高さが不揃いとなった開口端部４のトリミング加工を行う（トリミング工程Ｓ０８）。これにより、図３（ｆ）に示されるように、缶胴３にネック部６及び口金部７を有するボトル缶Ｗ３が成形される。   This DI can W2 is transferred to a bottle can manufacturing apparatus. In the bottle can manufacturing apparatus, a neck portion is formed by performing die processing (necking processing) stepwise on the opening end portion 4 of the can body 3 and its vicinity using a plurality of types of die processing tools (necking molds). 6 and the cap part 7 are molded (necking step S07). If necessary, a trimming process is performed between the plurality of types of die processing using the trimming processing tool on the opening end 4 where the heights are uneven (trimming step S08). As a result, as shown in FIG. 3 (f), a bottle can W 3 having the neck portion 6 and the base portion 7 is formed on the can body 3.

次いで、缶胴３の口金部７に、ねじ成形加工ツールを用いてねじ成形加工を施す（ねじ成形工程Ｓ０９）。また口金部７に、カール加工ツールを用いてカール加工を施し（カール工程Ｓ１０）、スロットル加工ツール（カールかしめ加工ツール）を用いてスロットル加工（スロットル工程Ｓ１１）を施す。
これにより、図３（ｇ）に示されるようなボトル缶１が製缶される。ボトル缶１には、スロットル工程Ｓ１１よりも後工程において飲料等の内容物が充填され、口金部７にキャップが取り付けられて密封される。 Next, the cap part 7 of the can body 3 is subjected to screw forming using a screw forming tool (screw forming step S09). Further, the base part 7 is subjected to curling processing using a curling tool (curling step S10), and throttle processing (throttle step S11) using a throttle processing tool (curling caulking processing tool).
Thereby, the bottle can 1 as shown in FIG.3 (g) is manufactured. The bottle can 1 is filled with contents such as beverages in a later process than the throttle process S11, and a cap is attached to the cap part 7 and sealed.

次に、本実施形態のボトル缶１の中間成形体（缶基体）であるＤＩ缶Ｗ２について説明する。
図４に示されるように、ＤＩ缶Ｗ２は、缶胴３と缶底２とを備えており、有底筒状をなしている。缶胴３は円筒状をなしており、缶胴３の外周面は、缶軸Ｃ方向の全長にわたって一定の外径に形成されている。 Next, a DI can W2 that is an intermediate molded body (can base body) of the bottle can 1 of the present embodiment will be described.
As shown in FIG. 4, the DI can W2 includes a can body 3 and a can bottom 2, and has a bottomed cylindrical shape. The can body 3 has a cylindrical shape, and the outer peripheral surface of the can body 3 is formed to have a constant outer diameter over the entire length in the can axis C direction.

缶胴３は、該缶胴３の開口端部４に配置されたフランジ部９と、フランジ部９よりも缶軸Ｃ方向に沿う缶底２側（つまり下方）に配置され、フランジ部９よりも内径が大きいウォール部１０と、缶軸Ｃ方向に沿うフランジ部９とウォール部１０との間に配置され、缶軸Ｃ方向に沿ってフランジ部９からウォール部１０に向かうに従い徐々に内径が大きくなるテーパー部１１と、を備えている。
このＤＩ缶Ｗ２が、ボトル缶製造装置によってボトル缶１に製缶されるときに、フランジ部９がネック部６及び口金部７に成形され、ウォール部１０及びテーパー部１１が胴部５とされる。 The can body 3 is disposed on the flange portion 9 disposed at the open end 4 of the can body 3 and on the can bottom 2 side (that is, lower side) along the can axis C direction than the flange portion 9. Are arranged between the wall portion 10 having a large inner diameter and the flange portion 9 and the wall portion 10 along the can axis C direction, and the inner diameter gradually increases from the flange portion 9 toward the wall portion 10 along the can axis C direction. And a taper portion 11 that increases.
When the DI can W2 is manufactured into the bottle can 1 by the bottle can manufacturing apparatus, the flange portion 9 is formed into the neck portion 6 and the base portion 7, and the wall portion 10 and the taper portion 11 are defined as the body portion 5. The

図４において、フランジ部９の肉厚（厚さ）Ｆは、缶軸Ｃ方向に沿って一定とされている。ウォール部１０の肉厚Ｗは、フランジ部９の肉厚Ｆよりも小さくされており、缶軸Ｃ方向に沿って一定である（ただし缶底２に接続する下端部を除く）。なお、本実施形態でいう「肉厚が一定」とは、最大肉厚と最少肉厚との差が０．０２０ｍｍ以下であることを指し、さらに好ましくは、前記差が０．０１０ｍｍ以下であるとよい。テーパー部１１の肉厚は、缶軸Ｃ方向に沿ってフランジ部９からウォール部１０に向かうに従い徐々に小さくされている。   In FIG. 4, the thickness (thickness) F of the flange portion 9 is constant along the can axis C direction. The wall portion 10 has a wall thickness W smaller than a wall thickness F of the flange portion 9 and is constant along the direction of the can axis C (except for a lower end portion connected to the can bottom 2). In the present embodiment, “the wall thickness is constant” means that the difference between the maximum wall thickness and the minimum wall thickness is 0.020 mm or less, and more preferably, the difference is 0.010 mm or less. Good. The thickness of the taper portion 11 is gradually reduced from the flange portion 9 toward the wall portion 10 along the can axis C direction.

そして、テーパー部１１の缶軸Ｃ方向に沿う長さＬが、２５〜４０ｍｍである。
また、フランジ部９の肉厚Ｆとウォール部１０の肉厚Ｗとの差、つまりフランジ部９とウォール部１０との肉厚差（Ｆ−Ｗ）が、０．０９０ｍｍ以上である。本実施形態の例では、この肉厚差（Ｆ−Ｗ）が０．１ｍｍ以上であり、さらに好ましくは、０．１２０ｍｍ以上である。
また、ウォール部１０の肉厚Ｗは、０．１ｍｍ以下である。
また、缶底２の肉厚Ｂは、０．３１ｍｍ以下である。缶底２の肉厚Ｂは、ブランクＷ０の板厚（元板厚）と略同一である。 And the length L along the can-axis C direction of the taper part 11 is 25-40 mm.
Further, the difference between the thickness F of the flange portion 9 and the thickness W of the wall portion 10, that is, the thickness difference (F−W) between the flange portion 9 and the wall portion 10 is 0.090 mm or more. In the example of this embodiment, this thickness difference (FW) is 0.1 mm or more, and more preferably 0.120 mm or more.
Moreover, the wall thickness W of the wall part 10 is 0.1 mm or less.
The wall thickness B of the can bottom 2 is 0.31 mm or less. The thickness B of the can bottom 2 is substantially the same as the thickness (original thickness) of the blank W0.

以上説明した本実施形態に係るＤＩ缶Ｗ２及び該ＤＩ缶Ｗ２を基に製造されたボトル缶１によれば、ＤＩ缶Ｗ２の缶胴３におけるフランジ部９とウォール部１０との間に、缶軸Ｃ方向に沿ってフランジ部９からウォール部１０に向かうに従い徐々に内径が大きくなるテーパー部１１が形成されている。そして、テーパー部１１の缶軸Ｃ方向に沿う長さＬが、２５〜４０ｍｍであるので、下記の作用効果を奏する。   According to the DI can W2 and the bottle can 1 manufactured based on the DI can W2 according to the present embodiment described above, the can is between the flange portion 9 and the wall portion 10 in the can body 3 of the DI can W2. A tapered portion 11 having an inner diameter that gradually increases from the flange portion 9 toward the wall portion 10 along the axis C direction is formed. And since the length L along the can-axis C direction of the taper part 11 is 25-40 mm, there exists the following effect.

すなわち、テーパー部１１の缶軸Ｃ方向の長さＬが２５ｍｍ以上であるので、このテーパー部１１の缶軸Ｃに対する傾斜が緩やかとなり、ＤＩ加工時に缶胴３を絞りしごき加工したパンチが、テーパー部１１に引っ掛かることなく抜けやすい。また、パンチによって缶胴３を均一にしごき加工しやすくなる。従って、たとえウォール部１０の肉厚Ｗを薄くして缶胴３を軽量化しても、缶胴３に座屈や肉欠け等の成形不良を生じにくくすることができる。
また、テーパー部１１の缶軸Ｃ方向の長さＬが４０ｍｍ以下であるので、上述したテーパー部１１による作用効果を奏しつつも、薄肉とされたウォール部１０の缶軸Ｃ方向の長さを十分に大きく確保して、缶胴３の軽量化を確実に図ることができる。 That is, since the length L of the taper portion 11 in the can axis C direction is 25 mm or more, the inclination of the taper portion 11 with respect to the can axis C becomes gentle, and the punch obtained by squeezing and squeezing the can body 3 during DI processing is tapered. It is easy to come off without being caught by the part 11. Moreover, it becomes easy to iron the can body 3 uniformly by punching. Therefore, even if the wall thickness 10 of the wall portion 10 is reduced to reduce the weight of the can body 3, it is possible to make it difficult to cause molding defects such as buckling and chipping in the can body 3.
Further, since the length L of the tapered portion 11 in the can axis C direction is 40 mm or less, the length of the thin wall portion 10 in the can axis C direction can be obtained while achieving the above-described effects of the tapered portion 11. It is possible to ensure a sufficiently large size and reliably reduce the weight of the can body 3.

以上より本実施形態によれば、缶胴３を軽量化しつつも、ＤＩ加工時の成形不良を抑制できる。   As described above, according to the present embodiment, it is possible to suppress molding defects during DI processing while reducing the weight of the can body 3.

また本実施形態では、ＤＩ缶Ｗ２のフランジ部９とウォール部１０との肉厚差（Ｆ−Ｗ）が、０．０９０ｍｍ以上であるので、その分、ウォール部１０の肉厚Ｗを薄くして、缶の軽量化を図ることができる。なお、好ましくは、前記肉厚差（Ｆ−Ｗ）は０．１ｍｍ以上であり、さらに好ましくは、前記肉厚差（Ｆ−Ｗ）は０．１２０ｍｍ以上である。   Moreover, in this embodiment, since the thickness difference (FW) of the flange part 9 and the wall part 10 of DI can W2 is 0.090 mm or more, the thickness W of the wall part 10 is made thin by that much. Thus, the weight of the can can be reduced. In addition, Preferably, the said thickness difference (FW) is 0.1 mm or more, More preferably, the said thickness difference (FW) is 0.120 mm or more.

また本実施形態では、ウォール部１０の肉厚Ｗが、０．１ｍｍ以下であるので、ウォール部１０を確実に薄肉化でき、缶が軽量化される。
また、ブランクＷ０の元板厚が維持される缶底２の肉厚Ｂが、０．３１ｍｍ以下と確実に薄くされていて、缶を効果的に軽量化できる。 Moreover, in this embodiment, since the wall thickness W of the wall part 10 is 0.1 mm or less, the wall part 10 can be reduced in thickness reliably and a can can be reduced in weight.
Further, the thickness B of the can bottom 2 where the original plate thickness of the blank W0 is maintained is reliably reduced to 0.31 mm or less, and the can can be effectively reduced in weight.

なお、本発明は前述の実施形態に限定されるものではなく、下記に説明するように、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。   The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention, as will be described below.

前述の実施形態では、ＤＩ缶Ｗ２のフランジ部９とウォール部１０との肉厚差（Ｆ−Ｗ）が０．０９０ｍｍ以上であるとしたが、これに限定されるものではなく、肉厚差（Ｆ−Ｗ）は０．０９０ｍｍ未満であってもよい。
また、ウォール部１０の肉厚Ｗが０．１ｍｍ以下であるとしたが、肉厚Ｗは０．１ｍｍより大きくてもよい。
また、缶底２の肉厚Ｂが０．３１ｍｍ以下であるとしたが、肉厚Ｂは０．３１ｍｍより大きくてもよい。 In the above-described embodiment, the thickness difference (F−W) between the flange portion 9 and the wall portion 10 of the DI can W2 is 0.090 mm or more. However, the thickness difference is not limited to this. (F-W) may be less than 0.090 mm.
Moreover, although the wall thickness 10 of the wall part 10 was 0.1 mm or less, the wall thickness W may be larger than 0.1 mm.
Moreover, although the thickness B of the can bottom 2 is 0.31 mm or less, the thickness B may be larger than 0.31 mm.

また、ボトル缶１の製造工程の中にボトムリフォーム工程が含まれていてもよい。ボトムリフォーム工程では、例えば成形ローラやポンチ爪等を用い、缶底２の環状凸部２ｂの内周壁及び外周壁の少なくともいずれかを押圧して、環状凸部２ｂに径方向に窪む凹部を成形する。ボトムリフォーム工程にて缶底２に凹部が形成されることにより、缶の耐圧強度（バルジ強度）が高まり、ボトムグロースやバックリングを効果的に抑制することができる。また耐圧強度が高められるため、缶の材料の選定幅（選択の自由度）が広がる。   Moreover, the bottom reforming process may be included in the manufacturing process of the bottle can 1. In the bottom reforming process, for example, using a forming roller, a punch claw, or the like, at least one of the inner peripheral wall and the outer peripheral wall of the annular convex portion 2b of the can bottom 2 is pressed to form a concave portion that is recessed in the radial direction on the annular convex portion 2b. Mold. By forming a recess in the can bottom 2 in the bottom reforming step, the pressure resistance (bulge strength) of the can is increased, and bottom growth and buckling can be effectively suppressed. In addition, since the pressure resistance is increased, the range of selection of the can material (degree of freedom of selection) is expanded.

その他、本発明の趣旨から逸脱しない範囲において、前述の実施形態、変形例及びなお書き等で説明した各構成（構成要素）を組み合わせてもよく、また、構成の付加、省略、置換、その他の変更が可能である。また本発明は、前述した実施形態によって限定されることはなく、特許請求の範囲によってのみ限定される。   In addition, in the range which does not deviate from the meaning of this invention, you may combine each structure (component) demonstrated by the above-mentioned embodiment, a modification, and a remark etc., addition of a structure, omission, substitution, others It can be changed. Further, the present invention is not limited by the above-described embodiments, and is limited only by the scope of the claims.

以下、本発明を実施例により具体的に説明する。ただし本発明はこの実施例に限定されるものではない。   Hereinafter, the present invention will be specifically described by way of examples. However, the present invention is not limited to this embodiment.

本発明の実施例１〜４として、前述した実施形態のＤＩ缶Ｗ２をカップ状体Ｗ１からＤＩ成形した。つまり、実施例１〜４のＤＩ缶Ｗ２は、テーパー部１１の缶軸Ｃ方向の長さＬが２５〜４０ｍｍである。また、従来の比較例として、前述の実施形態のＤＩ缶Ｗ２を基本形状としつつも、テーパー部１１の缶軸Ｃ方向の長さＬが２０ｍｍであるものをカップ状体Ｗ１からＤＩ成形した。各ＤＩ缶Ｗ２におけるテーパー部１１の長さＬ、缶底２の厚さＢ、フランジ部９の厚さＦ、ウォール部１０の厚さＷ、及び肉厚差（Ｆ−Ｗ）については、下記表１の通りである。   As Examples 1 to 4 of the present invention, the DI can W2 of the embodiment described above was DI molded from the cup-shaped body W1. That is, as for DI can W2 of Examples 1-4, length L of taper part 11 in the direction of can axis C is 25-40 mm. In addition, as a conventional comparative example, a DI can W2 of the above-described embodiment was used as a basic shape, and a taper portion 11 having a length L in the can axis C direction of 20 mm was DI molded from a cup-shaped body W1. The length L of the tapered portion 11, the thickness B of the can bottom 2, the thickness F of the flange portion 9, the thickness W of the wall portion 10, and the wall thickness difference (F−W) in each DI can W2 are as follows. It is as Table 1.

そして、各ＤＩ缶Ｗ２の仕様にてＤＩ成形を行い、成形性（成形不良の有無）について評価した。なお、評価の基準は下記の通りとした。
・「良好」…ＤＩ成形した１００缶あたりに、缶胴３に座屈や肉欠け等の成形不良が見受けられるものが、０缶であった場合。
・「不良」…ＤＩ成形した１００缶あたりに、缶胴３に座屈や肉欠け等の成形不良が見受けられるものが、１缶以上あった場合。 Then, DI molding was performed according to the specifications of each DI can W2, and the moldability (presence of molding defects) was evaluated. The evaluation criteria were as follows.
-“Good”: When 100 cans that were DI molded were found to have molding defects such as buckling or chipping in the can body 3, 0 cans.
-"Bad": When there are one or more cans in which a molding defect such as buckling or lack of meat is found in the can body 3 per 100 DI molded cans.

Figure 2018099710
Figure 2018099710

表１の結果より、本発明の実施例１〜４においては、ＤＩ成形の評価がすべて「良好」となり、加工後のＤＩ缶Ｗ２に座屈や肉欠け等の成形不良が生じなかった。一方、比較例は、加工後のＤＩ缶Ｗ２に座屈や肉欠け等の成形不良が見受けられ、ＤＩ成形の評価が「不良」であった。   From the results of Table 1, in Examples 1 to 4 of the present invention, the evaluations of DI molding were all “good”, and molding failures such as buckling and chipping did not occur in the processed DI can W2. On the other hand, in the comparative example, molding failures such as buckling and chipping were found in the processed DI can W2, and the evaluation of the DI molding was “bad”.

本発明のＤＩ缶及び該ＤＩ缶を基に製造されたボトル缶によれば、缶胴を軽量化しつつも、ＤＩ加工時の成形不良を抑制できる。従って、産業上の利用可能性を有する。   According to the DI can of the present invention and the bottle can manufactured based on the DI can, it is possible to suppress molding defects during DI processing while reducing the weight of the can body. Therefore, it has industrial applicability.

１ ボトル缶
２ 缶底
３ 缶胴
４ 開口端部
６ ネック部
７ 口金部
８ ねじ成形部
９ フランジ部
１０ ウォール部
１１ テーパー部
Ｂ 缶底の肉厚
Ｃ 缶軸
Ｆ フランジ部の肉厚
Ｌ テーパー部の缶軸方向の長さ
Ｗ ウォール部の肉厚
Ｗ２ ＤＩ缶 DESCRIPTION OF SYMBOLS 1 Bottle can 2 Can bottom 3 Can trunk 4 Open end 6 Neck part 7 Base part 8 Screw forming part 9 Flange part 10 Wall part 11 Tapered part B Thickness of can bottom C Can shaft F Thickness of flange part L Taper part Can axial length W Wall thickness W2 DI can

Claims (5)

缶胴と缶底とを備えた有底筒状のＤＩ缶であって、
前記缶胴は、
前記缶胴の開口端部に配置されたフランジ部と、
前記フランジ部よりも缶軸方向に沿う前記缶底側に配置され、前記フランジ部よりも内径が大きいウォール部と、
缶軸方向に沿う前記フランジ部と前記ウォール部との間に配置され、缶軸方向に沿って前記フランジ部から前記ウォール部に向かうに従い徐々に内径が大きくなるテーパー部と、を備え、
前記テーパー部の缶軸方向の長さが、２５〜４０ｍｍであることを特徴とするＤＩ缶。 A bottomed cylindrical DI can with a can body and a can bottom,
The can body is
A flange portion disposed at an open end of the can body;
A wall portion that is disposed on the can bottom side along the can axis direction than the flange portion, and has a larger inner diameter than the flange portion,
A taper portion that is disposed between the flange portion and the wall portion along the can axis direction, and has an inner diameter that gradually increases from the flange portion toward the wall portion along the can axis direction;
The DI can characterized in that the taper portion has a length in the can axis direction of 25 to 40 mm. 請求項１に記載のＤＩ缶であって、
前記フランジ部と前記ウォール部との肉厚差が、０．０９０ｍｍ以上であることを特徴とするＤＩ缶。 The DI can according to claim 1,
A DI can characterized in that a thickness difference between the flange portion and the wall portion is 0.090 mm or more. 請求項１又は２に記載のＤＩ缶であって、
前記ウォール部の肉厚が、０．１ｍｍ以下であることを特徴とするＤＩ缶。 The DI can according to claim 1 or 2,
A DI can characterized in that the wall portion has a thickness of 0.1 mm or less. 請求項１〜３のいずれか一項に記載のＤＩ缶であって、
前記缶底の肉厚が、０．３１ｍｍ以下であることを特徴とするＤＩ缶。 The DI can according to any one of claims 1 to 3,
A DI can having a thickness of the can bottom of 0.31 mm or less. 請求項１〜４のいずれか一項に記載のＤＩ缶から製缶されたボトル缶であって、
前記缶胴に、
缶軸方向に沿って前記缶底から前記開口端部側へ向かうに従い徐々に縮径するネック部と、
前記ネック部の前記開口端部側に隣接配置され、ねじ成形部が形成された口金部と、を備えたことを特徴とするボトル缶。 A bottle can made from the DI can according to any one of claims 1 to 4,
In the can body,
A neck portion that gradually decreases in diameter as it goes from the bottom of the can toward the opening end along the can axis direction;
A bottle can comprising: a base portion disposed adjacent to the opening end portion side of the neck portion and having a screw forming portion formed thereon.
JP2016246846A 2016-12-20 2016-12-20 DI can and bottle can Pending JP2018099710A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023084891A1 (en) * 2021-11-09 2023-05-19 東洋製罐グループホールディングス株式会社 Resin-coated aluminum-alloy drawn-and-ironed can

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0929370A (en) * 1995-07-25 1997-02-04 Kobe Steel Ltd Forming method for aluminum can body
JP2005335726A (en) * 2004-05-25 2005-12-08 Daiwa Can Co Ltd Bottle-shaped can manufacturing method
JPWO2007052364A1 (en) * 2005-11-04 2009-04-30 東洋製罐株式会社 Method of drawing and ironing resin-coated metal plate and resin-coated drawing and ironing can using the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0929370A (en) * 1995-07-25 1997-02-04 Kobe Steel Ltd Forming method for aluminum can body
JP2005335726A (en) * 2004-05-25 2005-12-08 Daiwa Can Co Ltd Bottle-shaped can manufacturing method
JPWO2007052364A1 (en) * 2005-11-04 2009-04-30 東洋製罐株式会社 Method of drawing and ironing resin-coated metal plate and resin-coated drawing and ironing can using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023084891A1 (en) * 2021-11-09 2023-05-19 東洋製罐グループホールディングス株式会社 Resin-coated aluminum-alloy drawn-and-ironed can

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