JP2016107340A - Punch sleeve and method for manufacturing di can using the same - Google Patents

Punch sleeve and method for manufacturing di can using the same Download PDF

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JP2016107340A
JP2016107340A JP2015225159A JP2015225159A JP2016107340A JP 2016107340 A JP2016107340 A JP 2016107340A JP 2015225159 A JP2015225159 A JP 2015225159A JP 2015225159 A JP2015225159 A JP 2015225159A JP 2016107340 A JP2016107340 A JP 2016107340A
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diameter
opening end
punch sleeve
planned
end portion
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政幸 武井
Masayuki Takei
政幸 武井
山下　淳
Atsushi Yamashita
淳 山下
友明 飯村
Tomoaki Iimura
友明 飯村
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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 make it possible to remarkably suppress the occurrence of wrinkles and make it possible to improve column strength when forming a constricted part in a subsequent step in a can body of a DI can subjected to DI processing by using a punch sleeve.SOLUTION: A punch sleeve 30 is provided for subjecting a cup-shaped body to DI processing to form a bottomed, cylindrical DI can. A can body 11 includes: a part 18 to be reduced in diameter which is positioned on a side closer to a can bottom than an opening end part 11a, and which is to be subjected to diameter-reducing processing in such a way that a diameter becomes smaller from the can bottom toward the side of the opening end part 11a; and a part 19 to be expanded in diameter which is positioned between the opening end part 11a and the part 18 to be reduced in diameter, and which is to be subjected to diameter-expanding processing in such a way that the diameter becomes larger from the can bottom toward the side of the opening end part 11a. In the outer peripheral surface of the punch sleeve 30, in a range corresponding to a region along a can axis O direction of the can body 11 at least from the opening end part 11a to the part 18 to be reduced in diameter, an outer diameter difference between a part corresponding to the opening end part 11a and a part corresponding to a portion other than the opening end part 11a is less than 10 μm.SELECTED DRAWING: Figure 6

Description

本発明は、２ピース缶やボトル缶等の缶体に用いられる有底筒状のＤＩ缶を製造する際に使用されるパンチスリーブ、及びこれを用いたＤＩ缶の製造方法に関するものであり、特に、缶胴（ウォール）に、該缶胴における他の部位よりも小径とされたくびれ部を有するＤＩ缶の製造に適したパンチスリーブ、及びこれを用いたＤＩ缶の製造方法に関する。   The present invention relates to a punch sleeve used in manufacturing a bottomed cylindrical DI can used for a can such as a two-piece can and a bottle can, and a method for manufacturing a DI can using the punch sleeve, In particular, the present invention relates to a punch sleeve suitable for manufacturing a DI can having a constricted portion whose diameter is smaller than that of other portions in the can body (wall), and a method for manufacturing a DI can using the same.

飲料等の内容物が充填、密封される缶体として、缶胴（ウォール）と缶底（ボトム）を有する有底筒状のＤＩ缶と、該ＤＩ缶の開口端部に巻締められる円板状の缶蓋と、を備えた２ピース缶が知られている。また、ＤＩ缶の開口端部にキャップが螺着されたボトル缶も周知である。   A bottomed cylindrical DI can having a can body (wall) and a bottom (bottom) as a can that is filled and sealed with beverages and the like, and a disc that is wound around the open end of the DI can A two-piece can having a can-shaped can lid is known. A bottle can in which a cap is screwed to the opening end of the DI can is also well known.

このような缶体に用いられるＤＩ缶は、アルミニウム合金材料の板材にカッピング工程（絞り工程）及びＤＩ工程（絞りしごき工程）を施すことにより、有底筒状に形成される。
なお、カッピング工程では、板材にカッピング加工（絞り加工）を施して、板材からＤＩ缶へ移行する成形中間体であるカップ状体とし、ＤＩ工程では、カップ状体の内部に、円筒状のパンチスリーブを挿入し、該カップ状体に対してＤＩ（Ｄｒａｗｉｎｇ＆Ｉｒｏｎｉｎｇ）加工を施しつつ、パンチスリーブの外周面の形状に対応する缶胴内周面の形状とされたＤＩ缶を成形する。 A DI can used for such a can body is formed into a bottomed cylindrical shape by subjecting a plate of aluminum alloy material to a cupping step (drawing step) and a DI step (drawing and ironing step).
In the cupping process, the plate material is cupped (drawn) to form a cup-shaped body that is a molding intermediate that moves from the plate material to the DI can. In the DI process, a cylindrical punch is placed inside the cup-shaped body. While inserting a sleeve and performing DI (Drawing & Ironing) processing on the cup-shaped body, a DI can having the shape of the inner peripheral surface of the can body corresponding to the shape of the outer peripheral surface of the punch sleeve is formed.

下記特許文献１には、パンチスリーブが開示されている。この特許文献１の図１及び図３に示されるように、パンチスリーブの外周面のうち、缶胴の開口端部に対応する上端部は、該上端部以外の部位よりも縮径して形成されており、このようなパンチスリーブによってＤＩ加工されたＤＩ缶においては、缶胴の開口端部の肉厚が、缶胴の開口端部以外の部位の肉厚よりも厚くなっている（下記特許文献３の図１３を参照）。
また、下記特許文献２においても、パンチスリーブの外周面のうち、缶胴の開口端部に対応する上端部が、該上端部以外の部位よりも縮径して形成されたものが開示されている（特許文献２の図１を参照）。なお、特許文献２においては、該特許文献２の図６に示されるように、上記パンチスリーブによりＤＩ加工された缶胴の開口端部（図６のグラフ中の符号Ｃ３）と、該開口端部以外の部位（図６のグラフ中の符号Ａ３）との肉厚差が、約１００μｍ程度とされている。また、特許文献２の図２等には、上記パンチスリーブが設けられたＤＩ加工装置が開示されている。 The following Patent Document 1 discloses a punch sleeve. As shown in FIG. 1 and FIG. 3 of this patent document 1, the upper end portion corresponding to the opening end portion of the can body is formed with a diameter smaller than the portion other than the upper end portion in the outer peripheral surface of the punch sleeve. In the DI can which is DI processed by such a punch sleeve, the thickness of the opening end portion of the can barrel is thicker than the thickness of the portion other than the opening end portion of the can barrel (see below). (See FIG. 13 of Patent Document 3).
Also, in the following Patent Document 2, an outer peripheral surface of the punch sleeve is disclosed in which an upper end portion corresponding to the opening end portion of the can body is formed with a diameter smaller than a portion other than the upper end portion. (See FIG. 1 of Patent Document 2). In Patent Document 2, as shown in FIG. 6 of Patent Document 2, the opening end (reference numeral C3 in the graph of FIG. 6) of the can body DI-processed by the punch sleeve, and the opening end The thickness difference from the portion other than the portion (reference numeral A3 in the graph of FIG. 6) is about 100 μm. Further, FIG. 2 and the like of Patent Document 2 disclose a DI processing apparatus provided with the punch sleeve.

ここで、本願明細書に添付した図８は、従来のＤＩ缶の缶胴１００、及び缶胴１００内に挿入されたパンチスリーブ１１０の部分断面図を示しており、図中に符号Ｏで示されるものは缶胴１００の缶軸であって、缶軸Ｏはパンチスリーブ１１０の中心軸と同軸に配置されている。
図８に示されるように、従来のパンチスリーブ１１０においては、その缶胴１００の開口端部１００ａに対応する部分（図８における上端部）の外径が、缶胴１００の開口端部１００ａ以外の部位に対応する部分（図８における上端部以外の部分）の外径に比べて、小径となっている。また、このパンチスリーブ１１０を用いてＤＩ加工された缶胴１００においては、その開口端部１００ａの肉厚が、該開口端部１００ａ以外の部位の肉厚よりも厚くされている。
具体的には、缶胴１００の内周面のうち開口端部１００ａは、該開口端部１００ａ以外の部位よりも径方向の内側へ向けて突出しており、開口端部１００ａとそれ以外の部位との間には、段部（段差）が形成される。 Here, FIG. 8 attached to the present specification shows a partial cross-sectional view of a conventional can body 100 of a DI can and a punch sleeve 110 inserted into the can body 100, and is indicated by a symbol O in the drawing. The can axis is a can axis of the can body 100, and the can axis O is arranged coaxially with the central axis of the punch sleeve 110.
As shown in FIG. 8, in the conventional punch sleeve 110, the outer diameter of the portion corresponding to the opening end portion 100a of the can body 100 (the upper end portion in FIG. 8) is other than the opening end portion 100a of the can body 100. Compared to the outer diameter of the part corresponding to this part (part other than the upper end part in FIG. 8), the diameter is small. Further, in the can body 100 processed by DI using this punch sleeve 110, the thickness of the opening end portion 100a is made thicker than the thickness of the portion other than the opening end portion 100a.
Specifically, the opening end portion 100a of the inner peripheral surface of the can body 100 protrudes inward in the radial direction from the portion other than the opening end portion 100a, and the opening end portion 100a and the other portion. A step (step) is formed between the two.

このように缶胴１００の開口端部１００ａの肉厚が厚くされることで、ネッキング工程やフランジング工程により成形加工された開口端部１００ａの強度が確保される。
なお、従来では、缶胴１００の開口端部１００ａ以外の部位の肉厚については、缶胴１００の材料使用量の削減及び軽量化を図る観点から、缶胴１００の開口端部１００ａよりも薄肉に形成される。 By increasing the thickness of the open end 100a of the can body 100 in this way, the strength of the open end 100a formed by the necking process or the flanging process is ensured.
Conventionally, the thickness of the portion other than the opening end portion 100a of the can body 100 is thinner than the opening end portion 100a of the can body 100 from the viewpoint of reducing the amount of material used in the can body 100 and reducing the weight. Formed.

下記特許文献４には、缶胴に、該缶胴における他の部位よりも小径とされたくびれ部を有する缶体が開示されている。このようなくびれ部を形成することにより、缶体のデザイン性を高めたり、持ちやすさ（グリップ性）を向上することができる。   Patent Document 4 listed below discloses a can body having a constricted portion that has a smaller diameter than other portions of the can body. By forming such a constricted portion, the design of the can body can be improved and the ease of holding (grip property) can be improved.

特開平５−２６１４４９号公報JP-A-5-261449 特開２００９−８２９８９号公報JP 2009-82989 A 特許第２６７６２０９号公報Japanese Patent No. 2676209 特開２００３−３０５５２３号公報JP 2003-305523 A

しかしながら、従来のパンチスリーブを用いたＤＩ缶の製造においては、下記の課題を有していた。
上述のパンチスリーブを用いたＤＩ加工（ＤＩ工程）後に行われる、缶胴にくびれ部を成形するくびれ部成形工程においては、図７（ａ）に示されるように、まず缶胴１１の内部及び外部に縮径用金型（パンチ３５及びダイス３６）を嵌合し、該缶胴１１の開口端部１１ａよりも缶底１２側に位置する縮径予定部（図４に符号１８で示される部分）に、缶軸Ｏ方向に沿って缶底１２から開口端部１１ａ側へ向かうに従い小径となる縮径加工を施し（縮径工程）、次いで図７（ｂ）に示されるように、缶胴１１の内部に拡径用金型（パンチ４０）を嵌合し、該缶胴１１の開口端部１１ａと縮径予定部との間に位置する拡径予定部（図４に符号１９で示される部分）に、缶軸Ｏ方向に沿って缶底１２から開口端部１１ａ側へ向かうに従い大径となる拡径加工を施す（拡径工程）。 However, the production of DI cans using conventional punch sleeves has the following problems.
In the constricted portion forming step for forming the constricted portion in the can body performed after the DI processing (DI step) using the punch sleeve described above, first, as shown in FIG. A diameter-reducing mold (punch 35 and die 36) is fitted to the outside, and a diameter-reduced portion (indicated by reference numeral 18 in FIG. 4) is located closer to the can bottom 12 than the open end 11a of the can body 11. Part) is subjected to a diameter reduction process (diameter reduction process) that becomes a smaller diameter from the bottom 12 to the opening end 11a side along the can axis O direction, and then, as shown in FIG. A diameter-expansion mold (punch 40) is fitted inside the barrel 11, and a diameter-expansion planned portion (reference numeral 19 in FIG. 4) is located between the opening end portion 11a of the can barrel 11 and the planned diameter-reduction portion. In the portion shown), the diameter increases from the can bottom 12 toward the open end 11a along the can axis O direction. The expanded processing performed (enlarged step).

具体的には、くびれ部成形工程のうち、図７（ａ）に示される縮径工程では、縮径用金型３５、３６とＤＩ缶１０とを缶軸Ｏ方向に相対的に接近移動させつつ、縮径用金型のパンチ３５とダイス３６の間に、ＤＩ缶１０の缶胴１１をその開口端部１１ａから進入させて、該缶胴１１の開口端部１１ａから縮径予定部までの領域の全体を縮径加工していく。
このため、図８に示される従来の缶胴１００の開口端部１００ａの形状である場合、パンチ３５とダイス３６との径方向の金型間距離（金型同士のクリアランス）は、該缶胴１００のうち開口端部１００ａの肉厚に応じて設定される。 Specifically, in the constriction portion forming step, in the constriction step shown in FIG. 7A, the constriction dies 35 and 36 and the DI can 10 are relatively moved in the can axis O direction. On the other hand, the can body 11 of the DI can 10 enters between the opening end portion 11a between the punch 35 and the die 36 of the diameter reducing die, and from the opening end portion 11a of the can body 11 to the planned diameter reducing portion. The entire area is reduced in diameter.
Therefore, in the case of the shape of the open end portion 100a of the conventional can body 100 shown in FIG. 8, the distance between the dies in the radial direction between the punch 35 and the die 36 (clearance between the dies) is the same. 100 is set according to the thickness of the opening end 100a.

しかしながら、従来の缶胴１００を縮径加工した際において、該缶胴１００にしわが生じやすいという課題があった。
また、缶胴にくびれ部を有する缶体においては、コラム強度（缶軸方向の荷重に対する強度）を高めることに、改善の余地があった。 However, when the diameter of the conventional can body 100 is reduced, there is a problem that the can body 100 is likely to be wrinkled.
Further, in the can body having the constricted portion in the can body, there is room for improvement in increasing the column strength (strength against the load in the can axis direction).

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、パンチスリーブを用いてＤＩ加工したＤＩ缶の缶胴に、その後工程においてくびれ部を成形するときに、該缶胴にしわが発生することを顕著に抑制でき、かつ、ＤＩ加工したＤＩ缶のコラム強度を高めることができるパンチスリーブ、及びこれを用いたＤＩ缶の製造方法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 when a constricted portion is formed in a can body of a DI can that has been DI processed using a punch sleeve in a subsequent process, the can body is wrinkled. It is an object of the present invention to provide a punch sleeve that can remarkably suppress this and increase the column strength of a DI processed DI can, and a method of manufacturing a DI can using the punch sleeve.

前記目的を達成するために、本発明の発明者は、このようなＤＩ缶の製造について鋭意研究を重ねた結果、缶胴の開口端部よりも缶底側に位置する部分において、缶胴と縮径用金型（パンチ、ダイス）との隙間が大きくなると、縮径加工時に缶胴にしわが発生しやすくなる、という知見を得るに至った。   In order to achieve the object, the inventor of the present invention has conducted extensive research on the production of such a DI can, and as a result, in the portion located on the bottom side of the can bottom from the opening end of the can barrel, It has been found that when the gap with the diameter reducing die (punch, die) becomes large, wrinkles are likely to occur in the can body during the diameter reducing process.

本発明は、このような知見に基づいてなされたものであり、カップ状体の内部に挿入され、該カップ状体にＤＩ加工を施して、缶胴と缶底を備える有底筒状のＤＩ缶を成形するのに用いられるパンチスリーブであって、前記缶胴は、該缶胴の開口端部よりも前記缶底側に位置するとともに、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小径となる縮径加工を施すことが予定される縮径予定部と、該缶胴の前記開口端部と前記縮径予定部との間に位置するとともに、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大径となる拡径加工を施すことが予定される拡径予定部と、を有し、当該パンチスリーブの外周面のうち、このパンチスリーブにより成形される前記缶胴の缶軸方向に沿う少なくとも前記開口端部から前記縮径予定部までの領域に対応する範囲における、前記開口端部に対応する部分と、該開口端部以外の部位に対応する部分と、の外径差が、１０μｍ未満であることを特徴とする。
また本発明は、カップ状体にＤＩ加工を施して、缶胴と缶底を備える有底筒状のＤＩ缶とするＤＩ工程と、前記缶胴の内部及び外部に縮径用金型を嵌合し、該缶胴の開口端部よりも前記缶底側に位置する縮径予定部に、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小径となる縮径加工を施した後、前記缶胴の内部に拡径用金型を嵌合し、該缶胴の前記開口端部と前記縮径予定部との間に位置する拡径予定部に、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大径となる拡径加工を施すことにより、前記缶胴にくびれ部を成形するくびれ部成形工程と、を有するＤＩ缶の製造方法であって、前記ＤＩ工程では、前述したパンチスリーブを前記カップ状体の内部に挿入し、該カップ状体にＤＩ加工を施すことを特徴とする。 The present invention has been made based on such knowledge, and is inserted into the cup-shaped body, subjected to DI processing on the cup-shaped body, and has a bottomed cylindrical DI having a can body and a can bottom. A punch sleeve used for molding a can, wherein the can body is located on the can bottom side with respect to an opening end of the can body, and the opening end extends from the can bottom along a can axis direction. A diameter reduction planned part that is planned to be reduced in diameter toward the part side, and located between the opening end part of the can body and the diameter reduction scheduled part, and in the can axis direction A diameter-expanded portion that is planned to be subjected to a diameter-expansion process that increases in diameter as it goes from the bottom of the can toward the opening end side, and the punch sleeve has an outer peripheral surface. At least the opening end portion along the can axis direction of the can body formed by A difference in outer diameter between a portion corresponding to the opening end portion and a portion corresponding to a portion other than the opening end portion in a range corresponding to a region up to the diameter reduction planned portion is less than 10 μm. And
Further, the present invention provides a DI process in which a cup-shaped body is subjected to DI processing to form a bottomed cylindrical DI can having a can body and a bottom, and a diameter reducing mold is fitted inside and outside the can body. In addition, a diameter reduction process is performed on the planned diameter reduction portion located closer to the bottom of the can than the opening end of the can body, and the diameter of the diameter decreases as it goes from the bottom of the can toward the opening end along the axial direction of the can. After being applied, a diameter-expansion mold is fitted into the inside of the can body, and the diameter-expanded portion located between the opening end portion and the diameter-reduced planned portion of the can body is arranged in the can axis direction. A constricted portion forming step of forming a constricted portion in the can body by performing a diameter expanding process that increases in diameter along the direction from the can bottom to the open end side. In the DI step, the punch sleeve described above is inserted into the cup-shaped body, and DI processing is performed on the cup-shaped body. To.

本発明のパンチスリーブ及びこれを用いたＤＩ缶の製造方法では、パンチスリーブの外周面のうち、該パンチスリーブにより成形される缶胴の缶軸方向に沿う少なくとも開口端部から拡径予定部を含む縮径予定部までの領域に対応する範囲における、開口端部に対応する部分と、開口端部以外の部位に対応する部分と、の外径差が、１０μｍ未満とされている。つまり、このパンチスリーブは概ね一定の外径に形成されている。
従って、このパンチスリーブを用いたＤＩ加工（ＤＩ工程）において、缶胴のうち、缶軸方向に沿う少なくとも開口端部から拡径予定部を含む縮径予定部までの領域を、例えば缶胴の肉厚差が１５μｍ以下となるように、一定の肉厚（互いに同一の肉厚）で成形することができる。 In the punch sleeve of the present invention and the DI can manufacturing method using the punch sleeve, a diameter expansion scheduled portion is formed from at least the opening end portion along the can axis direction of the can body formed by the punch sleeve, of the outer peripheral surface of the punch sleeve. The outer diameter difference between the portion corresponding to the opening end portion and the portion corresponding to the portion other than the opening end portion in the range corresponding to the region up to the planned diameter reduction portion is less than 10 μm. That is, the punch sleeve is formed with a substantially constant outer diameter.
Therefore, in the DI processing (DI process) using this punch sleeve, the region from at least the opening end along the can axis direction to the reduced diameter portion including the increased diameter portion of the can body, for example, It can be formed with a constant thickness (the same thickness as each other) so that the difference in thickness is 15 μm or less.

具体的には、ＤＩ工程において上記パンチスリーブを使用することにより、缶胴における開口端部、拡径予定部及び縮径予定部の内周面を、例えば互いの内周面同士が面一となるように成形することができる。また、缶胴における開口端部、拡径予定部及び縮径予定部の外周面については、従来と同様のＤＩ加工により、互いの外周面同士が面一となるように、かつ、互いの間に段部（段差）を形成することなく、平坦に成形できる。
従って、缶胴のうち缶軸方向に沿う少なくとも開口端部から縮径予定部までの領域を、一定の肉厚（厚さ）でＤＩ加工できるのである。
これにより、ＤＩ工程後にＤＩ缶に施されるくびれ部成形工程（缶胴の縮径予定部に縮径加工を施し（縮径工程）、次いで缶胴の拡径予定部に拡径加工を施す（拡径工程））において、下記の優れた作用効果を奏する。 Specifically, by using the punch sleeve in the DI step, the inner peripheral surfaces of the opening end portion, the diameter expansion planned portion and the diameter reduction planned portion in the can body, for example, the inner peripheral surfaces thereof are flush with each other. It can shape | mold so that it may become. In addition, the outer peripheral surfaces of the opening end portion, the diameter expansion planned portion, and the diameter reduction planned portion of the can body are arranged so that the outer peripheral surfaces are flush with each other by DI processing similar to the conventional one. It can be formed flat without forming a step (step).
Therefore, DI processing can be performed with a constant thickness (thickness) in at least the region from the opening end to the diameter reduction planned portion along the can axis direction in the can body.
As a result, a constriction part forming step applied to the DI can after the DI step (reducing the diameter reduction portion of the can body (reducing step)), and then applying the diameter expansion processing to the diameter expansion portion of the can body (Expansion process)) has the following excellent effects.

すなわち、くびれ部成形工程において、缶胴の内部及び外部に縮径用金型（パンチ及びダイス）を嵌合し、縮径予定部を縮径加工するにあたり、各縮径用金型（パンチ、ダイス）と、缶胴との径方向の隙間（金型と缶胴とのクリアランス）を、例えば２５μｍ以下程度にまで小さく抑えることができる。
詳しくは、上述のように、缶胴の缶軸方向に沿う少なくとも開口端部から縮径予定部までの領域を「一定の肉厚」にＤＩ成形した中でも、厳密には、成形後の缶胴の前記領域には僅かに肉厚差が生じている（詳しくは後述する）。そこで、缶胴の前記領域のうち肉厚が最も大きくなる部分の前記クリアランスを１０μｍに設定し、缶胴の前記領域における最大肉厚差が１５μｍである場合に、これらの和（２５μｍ）以下にまで、実際の前記クリアランスが抑えられる。 That is, in the constriction part forming step, the diameter reducing molds (punch and die) are fitted inside and outside the can body, and the diameter reducing planned part is subjected to diameter reduction processing. A gap in the radial direction between the die and the can body (clearance between the mold and the can body) can be reduced to, for example, about 25 μm or less.
Specifically, as described above, even though the region of at least the opening end portion along the can axis direction of the can barrel from the planned diameter reduction portion is DI-molded to a “constant thickness”, strictly speaking, after forming the can barrel There is a slight difference in thickness in the region (details will be described later). Therefore, when the clearance of the portion where the thickness is the largest in the region of the can body is set to 10 μm, and the maximum thickness difference in the region of the can body is 15 μm, the sum (25 μm) or less thereof is reduced. Until the actual clearance is reduced.

具体的に、縮径加工時においては、缶胴の外部に配置される縮径用金型（ダイス）と、缶胴とは、該缶胴の開口端部から縮径予定部までの領域全体において密着させられる。また、缶胴の内部に配置される縮径用金型（パンチ）と、該缶胴における縮径予定部よりも開口端部側に位置する部位とは、その径方向の隙間が上記クリアランス程度にまで小さく抑えられて接近配置される。   Specifically, at the time of diameter reduction, the diameter reduction die (die) arranged outside the can body and the can body are the entire region from the opening end of the can body to the planned diameter reduction portion. In close contact. Further, the diameter-reducing die (punch) disposed inside the can body and the portion located closer to the opening end than the planned diameter reducing portion in the can body have a radial clearance that is about the above clearance. It is kept close to a small size.

つまり、各縮径用金型と缶胴とを、缶軸方向に相対的に接近移動させつつ、該缶胴の開口端部から縮径予定部までの領域を、これら金型間に嵌合して縮径加工するときに、各縮径用金型が缶胴に対して内部と外部からそれぞれ密着するように接近配置させられるため、加工される缶胴の前記領域の全体が、金型間で意図しない向きに移動しにくくなり、しわの発生が顕著に抑制されるのである。   In other words, the respective molds for diameter reduction and the can body are moved relatively close to each other in the can axis direction, and the region from the opening end of the can body to the planned diameter reduction portion is fitted between these molds. When the diameter reduction processing is performed, the respective diameter reduction molds are arranged close to each other so as to be in close contact with the can body from the inside and the outside. It becomes difficult to move in an unintended direction, and the generation of wrinkles is remarkably suppressed.

このように、縮径用金型が、缶胴における開口端部のみならず、該開口端部からその缶底側に位置する縮径予定部までの広い領域を、径方向の両側から支持しつつ、缶胴にくびれ部を成形することができる。
これにより、くびれ部を成形する際に、缶胴にしわが生じることを顕著に抑制でき、加工精度を安定して高めることができる。 In this way, the diameter reducing mold supports not only the opening end portion of the can body, but also a wide region from the opening end portion to the planned diameter reducing portion located on the bottom side of the can from both sides in the radial direction. Meanwhile, the constricted portion can be formed on the can body.
Thereby, when forming a constriction part, it can suppress notably that wrinkles arise in a can body, and can improve processing accuracy stably.

ここで、本明細書でいうパンチスリーブの「一定の外径」、及び、缶胴の「一定の肉厚」について、詳しく説明する。
ＤＩ工程においては、カップ状体の内部に円筒状又は円柱状のパンチスリーブを挿入し、該カップ状体に対してＤＩ加工を施しつつ、パンチスリーブの外周面の形状に対応する缶胴内周面の形状とされたＤＩ缶を成形する。
つまり、本発明のＤＩ缶を成形するためのパンチスリーブの外周面は、該外周面のうち、缶胴の内周面における缶軸方向の少なくとも開口端部から縮径予定部までの領域に対応する部位が、パンチスリーブの中心軸方向（缶軸方向）に沿う全域にわたって一定の外径とされる。詳しくは、パンチスリーブの外周面のうち、このパンチスリーブにより成形される缶胴の缶軸方向に沿う少なくとも開口端部から縮径予定部までの領域に対応する範囲における、開口端部に対応する部分と、該開口端部以外の部位に対応する部分と、の外径差が、１０μｍ未満に設定される。 Here, the “constant outer diameter” of the punch sleeve and the “constant wall thickness” of the can body described in the present specification will be described in detail.
In the DI process, a cylindrical or columnar punch sleeve is inserted into the cup-shaped body, and the inner surface of the can body corresponding to the shape of the outer peripheral surface of the punch sleeve is subjected to DI processing on the cup-shaped body. A DI can having a surface shape is formed.
That is, the outer peripheral surface of the punch sleeve for forming the DI can of the present invention corresponds to the region from the outer peripheral surface to at least the opening end portion in the can axial direction on the inner peripheral surface of the can body to the reduced diameter planned portion. The part to be made has a constant outer diameter over the entire region along the center axis direction (can axis direction) of the punch sleeve. Specifically, in the outer peripheral surface of the punch sleeve, it corresponds to the opening end in a range corresponding to a region from at least the opening end to the planned diameter reduction portion along the can axis direction of the can body formed by the punch sleeve. The difference in outer diameter between the portion and the portion corresponding to the portion other than the opening end is set to be less than 10 μm.

すなわち、パンチスリーブの外周面を「一定の外径」に形成する場合には、その外径差は数μｍ程度（例えば２μｍ）に設定される。
一方、このパンチスリーブを用いて成形されるＤＩ缶の缶胴においては、缶胴のうち缶軸方向の少なくとも開口端部から縮径予定部までの領域を「一定の肉厚」に成形したとしても、ＤＩ缶の材料の異方性や個体差などにより、実際には１５μｍ以下の寸法誤差が生じることは免れない。
このため、本明細書でいう缶胴の「一定の肉厚」とは、具体的には、缶胴のうち缶軸方向の少なくとも開口端部から縮径予定部までの領域において、開口端部とそれ以外の部位との肉厚の差（絶対値）が、１５μｍ以下であることを指す。
なお、より詳しくは、缶胴の肉厚は、缶軸方向に沿う同一位置であっても、缶軸回りの周方向においてはばらつきが生じる（材料の異方性により肉厚差が生じる）ものであり、このため本明細書でいう「肉厚」とは、缶胴の缶軸方向に沿う同一位置において、周方向に等間隔をあけた複数箇所（例えば周方向均等に８箇所）で測定した肉厚の平均値を指す。 That is, when the outer peripheral surface of the punch sleeve is formed to have a “constant outer diameter”, the outer diameter difference is set to about several μm (for example, 2 μm).
On the other hand, in the can body of a DI can formed using this punch sleeve, it is assumed that a region from at least the opening end in the can axis direction to the planned diameter reduction portion of the can body is formed to a “constant thickness”. However, it is inevitable that a dimensional error of 15 μm or less actually occurs due to anisotropy or individual differences in the material of the DI can.
For this reason, the “certain wall thickness” of the can body as used in the present specification specifically refers to the opening end portion in at least the region of the can body in the can axis direction from the opening end portion to the diameter reduction planned portion. It means that the difference (absolute value) in wall thickness between the part and other parts is 15 μm or less.
In more detail, the thickness of the can body varies in the circumferential direction around the can axis even at the same position along the can axis direction (thickness difference occurs due to material anisotropy). For this reason, “thickness” as used in this specification is measured at a plurality of locations (for example, eight locations equally in the circumferential direction) at equal intervals in the circumferential direction at the same position along the can axis direction of the can body. It means the average value of the thickness.

また、缶胴において、缶軸方向に沿う少なくとも開口端部と縮径予定部との間の領域を一定の肉厚とするにあたっては、缶胴の開口端部の肉厚を、従来のＤＩ缶における缶胴の開口端部の肉厚と同等程度に確保することが好ましい。
つまり本発明においては、缶胴の開口端部の肉厚を確保すれば、前記領域のうち開口端部以外の部位の肉厚についても同様に確保されるため、くびれ部成形後の缶胴の強度を十分に高めることができる。
このように、本発明の特別な構成を採用することにより、ＤＩ缶の構造を複雑にすることなく、コラム強度を高めることが可能になる。 Further, in the can body, in order to make the region between at least the opening end portion and the diameter reduction planned portion along the can axis direction constant thickness, the thickness of the opening end portion of the can body is changed to the conventional DI can. It is preferable to ensure the same thickness as the thickness of the opening end of the can body.
That is, in the present invention, if the thickness of the opening end portion of the can body is secured, the thickness of the region other than the opening end portion in the region is also secured in the same manner. The strength can be sufficiently increased.
Thus, by adopting the special configuration of the present invention, it is possible to increase the column strength without complicating the structure of the DI can.

以上より本発明によれば、パンチスリーブを用いてＤＩ加工したＤＩ缶の缶胴に、その後工程においてくびれ部を成形するときに、該缶胴にしわが発生することを顕著に抑制でき、かつ、ＤＩ加工したＤＩ缶のコラム強度を高めることができるのである。   From the above, according to the present invention, when forming a constricted portion in the subsequent process of the DI can body processed by DI using a punch sleeve, it is possible to remarkably suppress the occurrence of wrinkles in the can body, and The column strength of DI processed DI cans can be increased.

また、本発明のパンチスリーブにおいて、前記缶胴は、前記開口端部及び該開口端部の前記缶底側に隣接する部位を有し、前記缶底よりも肉厚が薄くされた缶胴本体と、前記缶胴本体と前記缶底の間に位置してこれらを連結するとともに、前記缶胴本体から前記缶底側へ向かうに従い漸次肉厚が厚くなる缶胴連結部と、を有し、前記拡径予定部及び前記縮径予定部は、前記缶胴本体に配置されており、当該パンチスリーブの外周面のうち、このパンチスリーブにより成形される前記缶胴の前記缶胴本体における、前記開口端部に対応する部分と、該開口端部以外の部位に対応する部分と、の外径差が、１０μｍ未満であることとしてもよい。   Further, in the punch sleeve according to the present invention, the can body includes the opening end portion and a portion adjacent to the can bottom side of the opening end portion, and the can body main body is thinner than the can bottom. And a can body connecting portion that is located between the can body main body and the can bottom and connects them, and gradually increases in thickness as it goes from the can body main body to the can bottom side, The diameter-expanded portion and the diameter-reduced portion are arranged in the can body main body, and the outer surface of the punch sleeve, the can body formed by the punch sleeve in the can body main body, The difference in outer diameter between the portion corresponding to the opening end and the portion corresponding to the portion other than the opening end may be less than 10 μm.

上記構成のように、パンチスリーブの外周面のうち、このパンチスリーブにより成形される缶胴の缶胴本体における、開口端部に対応する部分と、該開口端部以外の部位に対応する部分と、の外径差が１０μｍ未満であり、つまりパンチスリーブの外周面のうち、缶胴における缶胴本体に対応する部位が、パンチスリーブの中心軸方向の全域にわたって一定の外径に形成されていると、このパンチスリーブを用いたＤＩ加工（ＤＩ工程）により、缶胴本体を、缶軸方向の全域にわたって一定の肉厚で成形することができる。   As in the above configuration, of the outer peripheral surface of the punch sleeve, a portion corresponding to the opening end in the can body main body of the can body formed by the punch sleeve, and a portion corresponding to a portion other than the opening end The outer diameter difference is less than 10 μm, that is, the portion of the outer peripheral surface of the punch sleeve corresponding to the can body main body is formed with a constant outer diameter over the entire region in the central axis direction of the punch sleeve. And by the DI processing (DI process) using this punch sleeve, the can body main body can be formed with a constant thickness over the entire region in the can axis direction.

これにより、ＤＩ缶における缶胴本体のうち開口端部よりも缶底側に位置する拡径予定部及び縮径予定部を、該缶胴本体の所期する位置に種々に配置することができる。
従って、ＤＩ缶のデザイン性や持ちやすさ（グリップ性）等の種々の要望に、容易に対応可能である。
また、ＤＩ加工した缶胴にくびれ部を成形することにより、本発明とは異なり例えばインパクト成形加工等でくびれ部を成形するような場合に比べて、缶胴表面に光沢が出やすくなり、美麗な外観を付与することができるとともに、製品価値を高めることが可能になる。 Thereby, the diameter expansion plan part and diameter reduction plan part which are located in the can bottom side rather than an opening end part among can body main parts in DI can can be variously arranged in the position which this can body main part expects. .
Accordingly, it is possible to easily meet various requests such as the design and ease of holding (grip) of the DI can.
Also, by forming the constricted portion in the DI processed can body, unlike the present invention, for example, the constricted portion is more easily glossed than in the case where the constricted portion is formed by impact molding or the like. A good appearance can be given and the product value can be increased.

また、本発明のパンチスリーブにおいて、前記外径差が、５μｍ以下であることが好ましい。   In the punch sleeve of the present invention, it is preferable that the outer diameter difference is 5 μm or less.

この場合、上述の缶胴にしわが発生することを抑制できるという効果が、より格別顕著なものとなる。   In this case, the effect that it can suppress that a wrinkle generate | occur | produces in the above-mentioned can body becomes especially remarkable.

本発明に係るパンチスリーブ、及びこれを用いたＤＩ缶の製造方法によれば、パンチスリーブを用いてＤＩ加工したＤＩ缶の缶胴に、その後工程においてくびれ部を成形するときに、該缶胴にしわが発生することを顕著に抑制でき、かつ、ＤＩ加工したＤＩ缶のコラム強度を高めることができる。   According to the punch sleeve according to the present invention and the DI can manufacturing method using the punch sleeve, when the constricted portion is formed in the DI can can cylinder processed by the punch sleeve in the subsequent process, the can cylinder The occurrence of wrinkles can be remarkably suppressed, and the column strength of the DI processed DI can can be increased.

本発明の一実施形態に係るパンチスリーブを用いてＤＩ加工したＤＩ缶であり、詳しくはこのＤＩ加工（ＤＩ工程）後において、くびれ部成形工程を含む後工程を経て作製されたＤＩ缶を示す斜視図である。1 is a DI can that is DI processed using a punch sleeve according to an embodiment of the present invention, and more specifically, shows a DI can that is manufactured through a post-process including a constricted portion forming step after the DI processing (DI step). It is a perspective view. 本発明の一実施形態に係るＤＩ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 DI can which concerns on one Embodiment of this invention. 本発明の一実施形態に係るＤＩ缶の製造方法（カッピング加工、ＤＩ加工及びトリミング加工）を説明する図である。It is a figure explaining the manufacturing method (Capping process, DI process, and trimming process) of DI can which concerns on one Embodiment of this invention. ＤＩ加工後のＤＩ缶の縦断面図である。It is a longitudinal cross-sectional view of DI can after DI processing. 図４のＡ部を拡大して示す図である。It is a figure which expands and shows the A section of FIG. 本発明の一実施形態に係るパンチスリーブと、このパンチスリーブを用いたＤＩ缶の製造方法（ＤＩ加工）を説明する部分縦断面図である。It is a fragmentary longitudinal cross-section explaining the punch sleeve which concerns on one Embodiment of this invention, and the manufacturing method (DI process) of DI can using this punch sleeve. 本発明の一実施形態に係るＤＩ缶の製造方法における（ａ）縮径加工、（ｂ）拡径加工、（ｃ）ネッキング加工、を説明する部分縦断面図である。It is a fragmentary longitudinal cross-section explaining (a) diameter reduction processing, (b) diameter expansion processing, and (c) necking processing in the manufacturing method of the DI can which concerns on one Embodiment of this invention. 従来のパンチスリーブと、このパンチスリーブを用いたＤＩ缶の製造方法（ＤＩ加工）を説明する部分縦断面図である。It is a fragmentary longitudinal cross-section explaining the conventional punch sleeve and the manufacturing method (DI process) of DI cans using this punch sleeve.

以下、図面を参照し、本発明の一実施形態に係るＤＩ缶１０及びその製造方法、並びに、ＤＩ缶１０の製造（ＤＩ加工）に用いられるパンチスリーブ３０について説明する。
図１に示されるように、本実施形態のＤＩ缶１０は、飲料等の内容物が充填・密封される缶体（２ピース缶）に用いられるものである。缶体は、有底筒状のＤＩ缶１０と、該ＤＩ缶１０の開口端部１１ａに巻締められる円板状の缶蓋（不図示）と、を備えている。なお、本実施形態のＤＩ缶１０は、２１１／２０４径缶に用いられるものであるが、これに限定されるものではなく、それ以外の例えば２１１／２０６径缶等に用いられてもよい。また、それよりも缶の外径が細い２０４／２００径缶や、２０４／２０２径缶等に適用してもよい。 Hereinafter, a DI can 10 according to an embodiment of the present invention, a manufacturing method thereof, and a punch sleeve 30 used for manufacturing the DI can 10 (DI processing) will be described with reference to the drawings.
As shown in FIG. 1, the DI can 10 of this embodiment is used for a can (two-piece can) filled and sealed with contents such as a beverage. The can body includes a bottomed cylindrical DI can 10 and a disk-shaped can lid (not shown) wound around the open end 11 a of the DI can 10. In addition, although the DI can 10 of this embodiment is used for a 211/204 diameter can, it is not limited to this, For example, it may be used for a 211/206 diameter can. Further, the present invention may be applied to a 204/200 diameter can or a 204/202 diameter can whose outer diameter is thinner than that.

図１及び図４に示されるように、ＤＩ缶１０は、円筒状をなす缶胴（ウォール）１１と、概ね円板状をなす缶底（ボトム）１２と、を備えている。
図４において、缶胴１１及び缶底１２は、互いに同軸に配置されており、本明細書では、これらの共通軸を缶軸Ｏという。
また、缶軸Ｏに沿う方向（缶軸Ｏ方向）のうち、缶胴１１の開口端部１１ａから缶底１２側へ向かう方向を下方、缶底１２から開口端部１１ａ側へ向かう方向を上方という。
また、缶軸Ｏに直交する方向を径方向といい、径方向のうち、缶軸Ｏに接近する向きを径方向の内側といい、缶軸Ｏから離間する向きを径方向の外側という。
また、缶軸Ｏ回りに周回する方向を周方向という。 As shown in FIGS. 1 and 4, the DI can 10 includes a cylindrical can body (wall) 11 and a generally disc-shaped can bottom (bottom) 12.
In FIG. 4, the can body 11 and the can bottom 12 are arranged coaxially with each other, and these common axes are referred to as a can axis O in this specification.
Of the directions along the can axis O (the direction of the can axis O), the direction from the open end 11a of the can body 11 toward the can bottom 12 is downward, and the direction from the can bottom 12 toward the open end 11a is upward. That's it.
A direction orthogonal to the can axis O is referred to as a radial direction, and a direction approaching the can axis O in the radial direction is referred to as an inner side in the radial direction, and a direction away from the can axis O is referred to as an outer side in the radial direction.
Further, a direction around the can axis O is referred to as a circumferential direction.

缶胴１１における上端部は、缶の外部に開口する開口端部１１ａとなっている。内容物は、この開口端部１１ａを通してＤＩ缶１０内に充填される。また、缶胴１１における下端部は、缶底１２により閉じられている。缶胴１１の外径は、例えば６５〜６７ｍｍである。   The upper end of the can body 11 is an open end 11a that opens to the outside of the can. The contents are filled into the DI can 10 through the open end 11a. The lower end of the can body 11 is closed by the can bottom 12. The outer diameter of the can body 11 is, for example, 65 to 67 mm.

図１に示されるように、缶胴１１には、該缶胴１１における他の部位よりも小径とされたくびれ部１７が形成されている。くびれ部１７は、缶胴１１における上端部（開口端部１１ａ）と下端部（後述する缶胴連結部１６）との間の中間部に形成されている。   As shown in FIG. 1, the can body 11 is formed with a constricted portion 17 having a smaller diameter than other portions of the can body 11. The constricted part 17 is formed in the intermediate part between the upper end part (opening end part 11a) in the can body 11, and a lower end part (can body connection part 16 mentioned later).

図１に示されるＤＩ缶１０の外観視において、くびれ部１７は、缶胴１１に凹曲面状に形成されている。具体的に、この外観視においてくびれ部１７は、缶胴１１の前記中間部における他の部位よりも径方向の内側へ向けて窪んでいるとともに、周方向に沿って缶胴１１の全周に延びる環状をなしている。
くびれ部１７が、前記中間部における該くびれ部１７以外の部位に対して径方向の内側へ後退させられる（窪む）深さは、例えば４〜１５ｍｍであり、本実施形態では８ｍｍ程度である。 In the external view of the DI can 10 shown in FIG. 1, the constricted portion 17 is formed on the can body 11 in a concave curved surface shape. Specifically, in this external view, the constricted portion 17 is recessed toward the inner side in the radial direction with respect to the other portion of the intermediate portion of the can body 11 and is disposed on the entire circumference of the can body 11 along the circumferential direction. It has an extending ring shape.
The depth at which the constricted portion 17 is retracted (recessed) inward in the radial direction with respect to the portion other than the constricted portion 17 in the intermediate portion is, for example, 4 to 15 mm, and is about 8 mm in the present embodiment. .

図４及び図５に示されるように、缶胴１１は、開口端部１１ａを含む缶胴本体１５と、缶胴本体１５と缶底１２の間に位置してこれらを連結する缶胴連結部１６と、を有している。
缶胴本体１５は、開口端部１１ａ及び該開口端部１１ａの缶底１２側に隣接する部位を有し、缶底１２よりも肉厚が薄くされている。前述したくびれ部１７は、缶胴本体１５における開口端部１１ａ以外の部位に配置される。図４に示されるＤＩ缶１０の縦断面視において、くびれ部１７は、缶胴本体１５の内側（径方向の内側）へ向けて窪む凹曲線状をなしている。 As shown in FIGS. 4 and 5, the can body 11 includes a can body main body 15 including an open end 11a, and a can body connecting portion that is located between the can body main body 15 and the can bottom 12 and connects them. 16.
The can body 15 has an open end 11 a and a portion adjacent to the open bottom 11 side of the open end 11 a, and is thinner than the can bottom 12. The aforementioned constricted portion 17 is disposed at a portion other than the opening end portion 11 a in the can body main body 15. In the longitudinal sectional view of the DI can 10 shown in FIG. 4, the constricted portion 17 has a concave curve shape that is recessed toward the inside (radially inside) of the can body main body 15.

図５に示されるＤＩ缶１０の部分縦断面視において、缶胴連結部１６は、缶胴本体１５から缶底１２側へ向かうに従い漸次肉厚が厚くされている。缶胴連結部１６の上端部は、缶胴本体１５の下端部に対して、段部（段差）を形成することなくなだらかに繋がっており、缶胴連結部１６の下端部は、缶底１２の後述するヒール部１２ｃの上端部に対して、段部を形成することなくなだらかに繋がっている。
缶胴連結部１６は、缶胴１１の下端部に位置して、缶胴本体１５から缶底１２へと該下端部の肉厚をなだらかに変化（増加）させる、肉厚遷移部となっている。 In the partial vertical cross-sectional view of the DI can 10 shown in FIG. 5, the can body coupling portion 16 is gradually thickened from the can body main body 15 toward the can bottom 12 side. The upper end portion of the can body connecting portion 16 is gently connected to the lower end portion of the can body main body 15 without forming a stepped portion (step), and the lower end portion of the can body connecting portion 16 is connected to the can bottom 12. The heel portion 12c, which will be described later, is gently connected without forming a stepped portion.
The can body connecting portion 16 is located at the lower end portion of the can body 11 and is a thickness transition portion that gently changes (increases) the thickness of the lower end portion from the can body main body 15 to the can bottom 12. Yes.

なお、図４及び図５に符号Ｈ１で示される直線（２点鎖線）は、缶胴１１における缶胴本体１５と缶胴連結部１６との境界を表す仮想の水平面（缶軸Ｏに垂直な平面）である。本実施形態では、ＤＩ缶１０の下端（後述する接地部１２ｂ）から仮想の水平面Ｈ１までの缶軸Ｏ方向に沿う距離が、例えば２２ｍｍ程度となっている。なお、ＤＩ缶１０の下端から仮想の水平面Ｈ１までの缶軸Ｏ方向の距離は、３５０ｍｌ缶の場合と５００ｍｌ缶の場合とで、互いに略同一である。   4 and 5 is a virtual horizontal plane (perpendicular to the can axis O) representing the boundary between the can body main body 15 and the can body connecting portion 16 in the can body 11. Plane). In the present embodiment, the distance along the can axis O direction from the lower end of the DI can 10 (a grounding portion 12b described later) to the virtual horizontal plane H1 is, for example, about 22 mm. The distance in the direction of the can axis O from the lower end of the DI can 10 to the virtual horizontal plane H1 is substantially the same for the 350 ml can and the 500 ml can.

図４及び図５において、缶底１２は、缶軸Ｏ上に位置するとともに、上方（缶胴１１の内部）に向けて膨出するように形成されたドーム部１２ａと、該ドーム部１２ａの外周縁部と缶胴１１の下端部（缶胴連結部１６）とを接続するヒール部１２ｃと、を備えている。   4 and 5, the can bottom 12 is located on the can axis O, and is formed so as to bulge upward (inside the can body 11), and the dome portion 12a. A heel portion 12c that connects the outer peripheral edge portion and the lower end portion of the can body 11 (can body connecting portion 16).

図５に示される縦断面視で、ヒール部１２ｃは、缶胴連結部１６から下方に向かうに従い漸次径方向の内側へ向けて傾斜している。またこの縦断面視で、ヒール部１２ｃにおける缶胴連結部１６との接続部分（つまりヒール部１２ｃの上端部）は、径方向の外側かつ下方へ向けて突出する凸曲線状をなしている。   In the longitudinal sectional view shown in FIG. 5, the heel portion 12 c is gradually inclined inward in the radial direction as it goes downward from the can body coupling portion 16. In addition, in this longitudinal sectional view, the connection portion of the heel portion 12c with the can body coupling portion 16 (that is, the upper end portion of the heel portion 12c) has a convex curve shape protruding outward in the radial direction and downward.

また、缶底１２におけるドーム部１２ａとヒール部１２ｃとの接続部分は、このＤＩ缶１０が正立姿勢（図４に示される、缶胴１１の開口端部１１ａが上方を向く姿勢）となるように接地面（載置面）上に載置されたときに、接地面に接する接地部１２ｂとなっている。接地部１２ｂは、缶底１２において最も下方に向けて突出しているとともに、周方向に沿って延びる環状をなしている。   Further, at the connection portion between the dome portion 12a and the heel portion 12c in the can bottom 12, the DI can 10 is in an upright posture (the posture in which the opening end portion 11a of the can body 11 faces upward as shown in FIG. 4). Thus, when placed on the grounding surface (mounting surface), the grounding portion 12b is in contact with the grounding surface. The ground contact portion 12b protrudes downward most in the can bottom 12 and has an annular shape extending along the circumferential direction.

なお、図４及び図５において、符号Ｈ２で示される直線（２点鎖線）は、ヒール部１２ｃの上端部がなす凸曲線の曲率半径の中心を通り、缶軸Ｏに垂直な仮想の水平面を表している。
本明細書では、ＤＩ缶１０の周壁（外周壁）のうち、仮想の水平面Ｈ２の上方に位置する部位が缶胴１１とされ、仮想の水平面Ｈ２の下方に位置する部位が缶底１２とされている。具体的には、ＤＩ缶１０の周壁において、仮想の水平面Ｈ２の下方に位置する缶底１２の部分が、ヒール部１２ｃとなっている。 4 and 5, a straight line (two-dot chain line) indicated by reference numeral H2 passes through the center of the radius of curvature of the convex curve formed by the upper end of the heel portion 12c and is a virtual horizontal plane perpendicular to the can axis O. Represents.
In the present specification, of the peripheral wall (outer peripheral wall) of the DI can 10, a portion located above the virtual horizontal plane H <b> 2 is the can body 11, and a portion located below the virtual horizontal plane H <b> 2 is the can bottom 12. ing. Specifically, on the peripheral wall of the DI can 10, the portion of the can bottom 12 located below the virtual horizontal plane H2 is a heel portion 12c.

次に、図２及び図３を参照して、アルミニウム合金材料の板材（ブランク）Ｗから有底筒状のＤＩ缶１０を製造する方法の一例を説明する。
ＤＩ缶１０は、板材打ち抜き工程、カッピング工程（絞り工程）、ＤＩ工程（絞りしごき工程）、トリミング工程、印刷工程、塗装工程、くびれ部成形工程（縮径工程及び拡径工程を含む）、ネッキング工程及びフランジング工程をこの順に経て、製缶される。 Next, an example of a method for manufacturing a bottomed cylindrical DI can 10 from a plate material (blank) W made of an aluminum alloy material will be described with reference to FIGS.
The DI can 10 includes a plate blanking process, a cupping process (drawing process), a DI process (drawing and ironing process), a trimming process, a printing process, a painting process, a constricted part forming process (including a diameter reducing process and a diameter expanding process), and necking. The cans are manufactured through the process and the flanging process in this order.

[板材打ち抜き工程]
Ａｌ合金材料からなる鋳塊に熱間圧延、冷間圧延及び焼鈍を施して所定板厚の中間板材を形成した後に、該中間板材に冷間仕上げ圧延を施すことにより最終板厚とされた圧延材を用意し、この圧延材を打ち抜いて、図３（ａ）に示されるように、円板状の板材（ブランク）Ｗを成形する（打ち抜き加工する）。 [Sheet punching process]
An ingot made of an Al alloy material is subjected to hot rolling, cold rolling and annealing to form an intermediate plate having a predetermined thickness, and then the intermediate plate is subjected to cold finish rolling to obtain a final thickness. A material is prepared, the rolled material is punched, and a disk-shaped plate material (blank) W is formed (punched) as shown in FIG.

[カッピング工程（絞り工程）]
次に、図３（ｂ）に示されるように、板材Ｗ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、カップ状体Ｗ１に成形する。カップ状体Ｗ１は、板材Ｗから後述するＤＩ缶Ｗ２（トリミング加工前のＤＩ缶１０）へ移行する成形中間体である。 [Cupping process (drawing process)]
Next, as shown in FIG. 3B, the plate material W is drawn (capping) by a cupping press to form a cup-shaped body W1. The cup-shaped body W1 is a forming intermediate body that shifts from the plate material W to a DI can W2 (DI can 10 before trimming) described later.

[ＤＩ工程（絞りしごき工程）]
次に、ＤＩ（Ｄｒａｗｉｎｇ＆Ｉｒｏｎｉｎｇ）加工装置によって、図３（ｃ）に示されるように、カップ状体Ｗ１にＤＩ加工（再絞りしごき加工）を施して、缶胴１１と缶底１２を備える有底筒状のＤＩ缶Ｗ２に成形する。
ＤＩ加工装置のうち、パンチスリーブ以外の構成については、例えば、前述した特許文献２（特開２００９−８２９８９号公報）に記載されたものを用いることができる。
すなわち、本実施形態のＤＩ加工装置においては、パンチスリーブが、従来にない特別な構成を備えている。パンチスリーブについては、詳しく後述する。 [DI process (drawing and ironing process)]
Next, with a DI (Drawing & Ironing) processing apparatus, as shown in FIG. 3 (c), the cup-shaped body W1 is subjected to DI processing (re-drawing ironing processing) to provide a can body 11 and a can bottom 12. Molded into a cylindrical DI can W2.
Regarding the configuration of the DI processing apparatus other than the punch sleeve, for example, the one described in Patent Document 2 (Japanese Patent Laid-Open No. 2009-82989) described above can be used.
That is, in the DI processing apparatus according to the present embodiment, the punch sleeve has a special configuration that is not conventionally provided. The punch sleeve will be described later in detail.

ＤＩ加工装置は、再絞り加工するための円形の貫通孔を有する一枚の再絞りダイと、この再絞りダイと同軸に配列される円形の貫通孔を有する複数枚（例えば、３枚）のアイアニング・ダイ（しごきダイ）と、アイアニング・ダイと同軸とされ、上記それぞれのアイアニング・ダイの各貫通孔の内部に嵌合可能とされ、ダイの軸方向に移動自在とされる円筒状又は円柱状のパンチスリーブと、このパンチスリーブの外側に嵌合された円筒状のカップホルダースリーブと、を備えている。   The DI processing apparatus includes a single redrawing die having a circular through hole for redrawing, and a plurality of (for example, three) pieces having a circular through hole arranged coaxially with the redrawing die. A cylindrical or circular shape that is coaxial with the ironing die and ironing die, can be fitted into each of the through holes of the ironing die, and can move in the axial direction of the die. A columnar punch sleeve and a cylindrical cup holder sleeve fitted to the outside of the punch sleeve are provided.

ＤＩ加工装置による再絞り加工は、カップ状体Ｗ１をパンチスリーブと再絞りダイとの間に配置し、カップホルダースリーブ及びパンチスリーブを前進させて、カップホルダースリーブが、再絞りダイの端面にカップ状体Ｗ１の底面を押し付けてカップ押し付け動作を行いながら、パンチスリーブがカップ状体Ｗ１を再絞りダイの貫通孔内に押し込むことにより行われる。
その結果、所定の内径を有する再絞り加工されたカップ状体（不図示）が成形される。引き続き、再絞り加工されたカップ状体を複数のアイアニング・ダイを順次通過させて徐々にしごき加工をして、カップ状体の周壁をしごいて該周壁を延伸させ、周壁高さを高くするとともに壁厚を薄くして、有底筒状のＤＩ缶Ｗ２を成形する。 In the redrawing process by the DI processing apparatus, the cup-shaped body W1 is arranged between the punch sleeve and the redrawing die, the cup holder sleeve and the punch sleeve are advanced, and the cup holder sleeve is cupped on the end face of the redrawing die. The punch sleeve pushes the cup-shaped body W1 into the through-hole of the redraw die while pressing the bottom surface of the shaped body W1 to perform the cup pressing operation.
As a result, a redrawn cup-like body (not shown) having a predetermined inner diameter is formed. Subsequently, the redrawn cup-shaped body is passed through a plurality of ironing dies one after another and gradually squeezed to squeeze the peripheral wall of the cup-shaped body and extend the peripheral wall to increase the peripheral wall height. At the same time, the wall thickness is reduced to form a bottomed cylindrical DI can W2.

しごき加工が終了したＤＩ缶Ｗ２は、パンチスリーブがさらに前方に押し出して底部（缶底１２となる部分）をボトム成形金型に押圧することにより、底部が、上述のドーム形状に形成される。
このＤＩ缶Ｗ２は、上述のように周壁がしごかれることで冷間加工硬化され、強度が高められる。 The DI can W2 that has been subjected to the ironing process has its bottom portion formed in the above-mentioned dome shape by pushing the bottom portion (portion that becomes the can bottom 12) against the bottom molding die by pushing the punch sleeve further forward.
The DI can W2 is cold-worked and hardened by squeezing the peripheral wall as described above, and the strength is increased.

つまり、本実施形態のパンチスリーブは、カップ状体Ｗ１の内部に挿入され、該カップ状体Ｗ１にＤＩ加工を施して、缶胴１１と缶底１２を備える有底筒状のＤＩ缶Ｗ２を成形するのに用いられる、ＤＩ加工（ＤＩ工程）用の金型である。
そして、図６に示されるように、本実施形態のパンチスリーブ３０の外周面のうち、このパンチスリーブ３０により成形される缶胴１１の缶軸Ｏ方向に沿う少なくとも開口端部１１ａから、後にくびれ部１７となる予定部（後述する拡径予定部１９及び縮径予定部１８）までの領域に対応する範囲における、開口端部１１ａに対応する部分と、該開口端部１１ａ以外の部位に対応する部分と、の外径差が、１０μｍ未満とされている。つまり、このパンチスリーブ３０は概ね一定の外径に形成されている。なお、より好ましくは、パンチスリーブ３０の前記外径差は、５μｍ以下である。また、本実施形態の例では、パンチスリーブ３０の外周面は、上記範囲において、段差なく形成されている。 That is, the punch sleeve of the present embodiment is inserted into the cup-shaped body W1, and DI processing is applied to the cup-shaped body W1 to form a bottomed cylindrical DI can W2 having a can body 11 and a can bottom 12. This is a mold for DI processing (DI process) used for molding.
Then, as shown in FIG. 6, of the outer peripheral surface of the punch sleeve 30 of the present embodiment, at least from the open end portion 11 a along the direction of the can axis O of the can body 11 formed by the punch sleeve 30, the constriction is made later. Corresponding to a portion corresponding to the opening end portion 11a and a portion other than the opening end portion 11a in a range corresponding to a region up to a planned portion to be the portion 17 (a planned diameter expansion portion 19 and a diameter reduction planned portion 18 described later) The outer diameter difference between the portion and the portion to be made is less than 10 μm. That is, the punch sleeve 30 is formed with a substantially constant outer diameter. More preferably, the outer diameter difference of the punch sleeve 30 is 5 μm or less. In the example of the present embodiment, the outer peripheral surface of the punch sleeve 30 is formed without a step in the above range.

具体的に本実施形態では、パンチスリーブ３０の外周面のうち、このパンチスリーブ３０により成形される缶胴１１の缶胴本体１５における、開口端部１１ａに対応する部分と、該開口端部１１ａ以外の部位に対応する部分と、の外径差が、１０μｍ未満である。つまり、パンチスリーブ３０の外周面のうち、缶胴本体１５に対応する部位（図４を参照）が、パンチスリーブ３０の中心軸方向（缶軸Ｏ方向）の全域にわたって一定の外径に形成されている。なお、より好ましくは、パンチスリーブ３０の前記外径差は、５μｍ以下である。また、本実施形態の例では、パンチスリーブ３０の外周面は、缶胴本体１５に対応する部位において、段差なく形成されている。   Specifically, in the present embodiment, a portion of the outer peripheral surface of the punch sleeve 30 corresponding to the opening end portion 11a in the can body main body 15 of the can body 11 formed by the punch sleeve 30, and the opening end portion 11a. The outer diameter difference from the part corresponding to the other part is less than 10 μm. That is, a portion of the outer peripheral surface of the punch sleeve 30 corresponding to the can body 15 (see FIG. 4) is formed to have a constant outer diameter over the entire region in the central axis direction (can axis O direction) of the punch sleeve 30. ing. More preferably, the outer diameter difference of the punch sleeve 30 is 5 μm or less. In the example of the present embodiment, the outer peripheral surface of the punch sleeve 30 is formed without a step at a portion corresponding to the can body 15.

また、図４及び図５において、ＤＩ工程では、上記パンチスリーブ３０をカップ状体Ｗ１の内部に挿入し、該カップ状体Ｗ１にＤＩ加工を施すことにより、成形したＤＩ缶Ｗ２における缶胴１１のうち、缶軸Ｏ方向に沿う少なくとも開口端部１１ａから、後にくびれ部１７となる予定部（後述する拡径予定部１９及び縮径予定部１８）までの領域を、例えば開口端部１１ａと該開口端部１１ａ以外の部位との肉厚差が１５μｍ以下となるように、一定の肉厚で、かつ段差なく成形する。   4 and 5, in the DI step, the punch sleeve 30 is inserted into the cup-shaped body W1, and the cup-shaped body W1 is subjected to DI processing to thereby form the can body 11 in the formed DI can W2. Among them, a region from at least the opening end portion 11a along the can axis O direction to a planned portion (a diameter expansion planned portion 19 and a diameter reduction planned portion 18 to be described later) that will later become a constricted portion 17 is, for example, an opening end portion 11a Molding is performed with a constant thickness and without a step so that the thickness difference from the portion other than the opening end portion 11a is 15 μm or less.

具体的には、ＤＩ工程において上記パンチスリーブ３０を使用することにより、缶胴１１における開口端部１１ａ及び後にくびれ部１７となる予定部（拡径予定部１９及び縮径予定部１８）の内周面を、互いの内周面同士が面一となるように、かつ、互いの間に段部（段差）を形成することなく、平坦に成形する。また、缶胴１１における開口端部１１ａ及び後にくびれ部１７となる予定部（拡径予定部１９及び縮径予定部１８）の外周面については、従来と同様のＤＩ加工により、互いの外周面同士が面一となるように、かつ、互いの間に段部（段差）を形成することなく、平坦に成形する。
これにより、缶胴１１のうち缶軸Ｏ方向に沿う少なくとも開口端部１１ａからくびれ部１７となる予定部（拡径予定部１９及び縮径予定部１８）までの領域を、一定の肉厚（厚さ）で、かつ段差なくＤＩ加工する。 Specifically, by using the punch sleeve 30 in the DI process, the inside of the opening end portion 11a and the constricted portion 17 (the diameter expansion planned portion 19 and the diameter reduction planned portion 18) that will become the constricted portion 17 later in the can body 11 is performed. The peripheral surfaces are formed flat so that the inner peripheral surfaces are flush with each other and without forming a step (step) between them. Moreover, about the outer peripheral surface of the opening end part 11a in the can body 11 and the plan part (the diameter expansion plan part 19 and the diameter reduction plan part 18) which will become the constriction part 17 later, each other outer peripheral surface is subjected to DI processing similar to the conventional one. It shape | molds flatly, without forming a step part (step) between each other so that it may become flush | level.
Thereby, the area | region from the opening end part 11a along the can axis | shaft O direction among the can bodies 11 to the plan part (diameter expansion plan part 19 and diameter reduction plan part 18) used as the constriction part 17 is constant thickness ( Thickness) and DI processing without steps.

具体的に本実施形態では、ＤＩ工程において、缶胴本体１５における開口端部１１ａと該開口端部１１ａ以外の部位との肉厚差を、１５μｍ以下とすることにより、缶胴本体１５を、缶軸Ｏ方向の全域にわたって一定の肉厚で、かつ段差なく成形する。つまり、缶胴本体１５全体（上端部（開口端部１１ａ）及び該上端部の下方に連なる部位の全て）を、一定の肉厚とする。   Specifically, in the present embodiment, in the DI process, by setting the difference in wall thickness between the opening end 11a and the portion other than the opening end 11a in the can body 15 to be 15 μm or less, the can body 15 is It is formed with a constant thickness over the entire region in the direction of the can axis O and without any step. That is, the entire can body main body 15 (the upper end portion (opening end portion 11a) and all the portions continuous below the upper end portion) has a constant thickness.

詳しくは、缶胴１１の前記領域における肉厚差の最大値が、１５μｍ以下であり、缶胴本体１５における肉厚差の最大値が、１５μｍ以下である。なお、本実施形態でいう「肉厚差」とは、缶胴１１の周方向に沿う各部での肉厚差ではなく、缶軸Ｏ方向に沿う各部での肉厚差を指す。つまり、詳しくは後述するが、缶胴１１の周方向に沿う肉厚は、材料の異方性によりばらつきが生じるので、まず周方向に沿う肉厚の平均値を出し、缶軸Ｏ方向の各部で、前記平均値同士を比較したものが上記「肉厚差」である。   Specifically, the maximum thickness difference in the region of the can body 11 is 15 μm or less, and the maximum thickness difference in the can body 15 is 15 μm or less. In addition, the “thickness difference” in the present embodiment refers to a thickness difference in each part along the can axis O direction, not a thickness difference in each part along the circumferential direction of the can body 11. That is, as will be described in detail later, since the thickness along the circumferential direction of the can body 11 varies due to the anisotropy of the material, first, the average value of the thickness along the circumferential direction is obtained, and each part in the can axis O direction Thus, the “thickness difference” is a comparison of the average values.

また、より好ましくは、缶胴１１の缶軸Ｏ方向に沿う少なくとも開口端部１１ａから縮径予定部１８までの領域のうち、開口端部１１ａと該開口端部１１ａ以外の部位との肉厚差を、１０μｍ以下とする。また、缶胴本体１５における開口端部１１ａと該開口端部１１ａ以外の部位との肉厚差を、１０μｍ以下とする。
この場合、缶胴１１の前記領域における肉厚差の最大値が、１０μｍ以下であり、缶胴本体１５における肉厚差の最大値が、１０μｍ以下である。 More preferably, the thickness of the opening end 11a and the portion other than the opening end 11a in at least the region from the opening end 11a to the diameter reduction planned portion 18 along the can axis O direction of the can body 11 is as follows. The difference is 10 μm or less. Further, the thickness difference between the opening end portion 11a and the portion other than the opening end portion 11a in the can body main body 15 is set to 10 μm or less.
In this case, the maximum thickness difference in the region of the can body 11 is 10 μm or less, and the maximum thickness difference in the can body 15 is 10 μm or less.

そして、パンチスリーブ３０の外径差が１０μｍ未満である場合には、該パンチスリーブ３０によりＤＩ加工された缶胴１１の肉厚差を、例えば１５μｍ以下に抑えることができる。また、パンチスリーブ３０の外径差が５μｍ以下である場合には、該パンチスリーブ３０によりＤＩ加工された缶胴１１の肉厚差を、例えば１０μｍ以下に抑えることができる。   When the outer diameter difference of the punch sleeve 30 is less than 10 μm, the thickness difference of the can body 11 processed by the DI by the punch sleeve 30 can be suppressed to, for example, 15 μm or less. Further, when the outer diameter difference of the punch sleeve 30 is 5 μm or less, the thickness difference of the can body 11 processed by DI by the punch sleeve 30 can be suppressed to 10 μm or less, for example.

また、ＤＩ工程により成形されるＤＩ缶Ｗ２の缶胴１１には、該缶胴１１の開口端部１１ａよりも缶底１２側に位置するとともに、後述するくびれ部成形工程の縮径工程において、缶軸Ｏ方向に沿って缶底１２から開口端部１１ａ側へ向かうに従い小径となる縮径加工を施すことが予定される縮径予定部１８と、該缶胴１１の開口端部１１ａと縮径予定部１８との間に位置するとともに、後述するくびれ部成形工程の拡径工程において、缶軸Ｏ方向に沿って缶底１２から開口端部１１ａ側へ向かうに従い大径となる拡径加工を施すことが予定される拡径予定部１９と、が備えられる。
具体的に本実施形態では、縮径予定部１８及び拡径予定部１９が、缶胴本体１５に配置されている。
これらの縮径予定部１８及び拡径予定部１９は、ＤＩ工程よりも後工程のくびれ部成形工程において縮径加工・拡径加工されるまでは、缶胴１１において、互いに略同一の直径とされる。 Further, in the can body 11 of the DI can W2 formed by the DI process, the can body 11 is positioned on the can bottom 12 side with respect to the opening end portion 11a of the can body 11, and in the diameter reducing step of the constricted portion forming process described later, A diameter reduction planned portion 18 which is scheduled to be reduced in diameter along the can axis O direction from the can bottom 12 toward the opening end portion 11a side, and the opening end portion 11a of the can body 11 and the reduced size. In the diameter increasing process of the constricted part forming process, which will be described later, the diameter increasing process is performed such that the diameter increases from the can bottom 12 toward the opening end 11a side along the can axis O direction. And a diameter-expansion scheduled portion 19 that is scheduled to be treated.
Specifically, in the present embodiment, the diameter reduction scheduled portion 18 and the diameter expansion scheduled portion 19 are arranged in the can body main body 15.
These diameter reduction planned portion 18 and diameter expansion scheduled portion 19 have substantially the same diameter in the can body 11 until diameter reduction processing and diameter expansion processing are performed in a constriction portion forming step that is a later step than the DI step. Is done.

ここで、本明細書でいうパンチスリーブ３０の「一定の外径」、及び、缶胴１１の「一定の肉厚」について、詳しく説明する。
ＤＩ工程においては、カップ状体Ｗ１の内部に円筒状又は円柱状のパンチスリーブ３０を挿入し、該カップ状体Ｗ１に対してＤＩ加工を施しつつ、パンチスリーブ３０の外周面の形状に対応する缶胴１１内周面の形状とされたＤＩ缶Ｗ２を成形する。
つまり、図６に示されるように、本実施形態のＤＩ缶Ｗ２を成形するためのパンチスリーブ３０の外周面は、該外周面のうち、缶胴１１の内周面における缶軸Ｏ方向の少なくとも開口端部１１ａからくびれ部１７となる予定部（図６において符号１９、１８で示される拡径予定部及び縮径予定部）までの領域に対応する部位が、パンチスリーブ３０の中心軸方向（缶軸Ｏ方向）に沿う全域にわたって一定の外径とされる。詳しくは、パンチスリーブ３０の外周面のうち、このパンチスリーブ３０により成形される缶胴１１の缶軸Ｏ方向に沿う少なくとも開口端部１１ａから縮径予定部１８までの領域に対応する範囲における、開口端部１１ａに対応する部分と、該開口端部１１ａ以外の部位に対応する部分と、の外径差が、１０μｍ未満に設定される。 Here, the “constant outer diameter” of the punch sleeve 30 and the “constant wall thickness” of the can body 11 as used herein will be described in detail.
In the DI process, a cylindrical or columnar punch sleeve 30 is inserted into the cup-shaped body W1, and the shape of the outer peripheral surface of the punch sleeve 30 is accommodated while performing DI processing on the cup-shaped body W1. The DI can W2 having the shape of the inner peripheral surface of the can body 11 is formed.
That is, as shown in FIG. 6, the outer peripheral surface of the punch sleeve 30 for forming the DI can W2 of the present embodiment is at least in the direction of the can axis O on the inner peripheral surface of the can body 11 among the outer peripheral surfaces. A portion corresponding to a region from the opening end portion 11a to a planned portion to be the constricted portion 17 (a planned diameter expansion portion and a diameter reduction planned portion indicated by reference numerals 19 and 18 in FIG. 6) is in the central axis direction of the punch sleeve 30 ( The outer diameter is constant over the entire area along the direction of the can axis O). Specifically, in the outer peripheral surface of the punch sleeve 30, in a range corresponding to at least the region from the opening end portion 11a to the reduced diameter planned portion 18 along the can axis O direction of the can body 11 formed by the punch sleeve 30, The difference in outer diameter between the portion corresponding to the opening end portion 11a and the portion corresponding to the portion other than the opening end portion 11a is set to be less than 10 μm.

すなわち、パンチスリーブ３０の外周面を「一定の外径」に形成する場合には、その外径差は数μｍ程度（例えば２μｍ）に設定される。
一方、このパンチスリーブ３０を用いて成形されるＤＩ缶Ｗ２の缶胴１１においては、缶胴１１のうち缶軸Ｏ方向の少なくとも開口端部１１ａからくびれ部１７となる予定部までの領域を「一定の肉厚」に成形したとしても、ＤＩ缶Ｗ２の材料の異方性や個体差などにより、実際には１５μｍ以下の寸法誤差が生じることは免れない。
このため、本明細書でいう缶胴１１の「一定の肉厚」とは、具体的には、缶胴１１のうち缶軸Ｏ方向の少なくとも開口端部１１ａからくびれ部１７となる予定部（拡径予定部１９及び縮径予定部１８）までの領域において、開口端部１１ａとそれ以外の部位との肉厚の差（絶対値）が、１５μｍ以下であることを指す。
なお、より詳しくは、缶胴１１の肉厚は、缶軸Ｏ方向に沿う同一位置であっても、缶軸Ｏ回りの周方向においてはばらつきが生じる（材料の異方性により肉厚差が生じる）ものであり、このため本明細書でいう「肉厚」とは、缶胴１１の缶軸Ｏ方向に沿う同一位置において、周方向に等間隔をあけた複数箇所（例えば周方向均等に８箇所）で測定した肉厚の平均値を指す。 That is, when the outer peripheral surface of the punch sleeve 30 is formed to have a “constant outer diameter”, the outer diameter difference is set to about several μm (for example, 2 μm).
On the other hand, in the can body 11 of the DI can W2 formed using the punch sleeve 30, an area from at least the opening end portion 11 a in the can axis O direction to a planned portion that becomes the constricted portion 17 in the can shaft O direction is expressed as “ Even if it is molded to a “constant thickness”, it is inevitable that a dimensional error of 15 μm or less actually occurs due to the anisotropy and individual differences of the material of the DI can W2.
Therefore, the “certain wall thickness” of the can body 11 as used in the present specification specifically refers to a portion of the can body 11 that becomes the constricted portion 17 from at least the open end portion 11a in the direction of the can axis O ( In the region up to the diameter expansion planned portion 19 and the diameter reduction planned portion 18), it indicates that the difference in wall thickness (absolute value) between the opening end portion 11a and other portions is 15 μm or less.
More specifically, the thickness of the can body 11 varies in the circumferential direction around the can axis O even at the same position along the can axis O direction (thickness difference due to material anisotropy). For this reason, the “thickness” as used in the present specification is the same position along the can axis O direction of the can body 11 at a plurality of locations (for example, equally in the circumferential direction) spaced equally in the circumferential direction. The average value of the wall thickness measured at 8 points).

図５に示される缶胴１１のうち、缶胴本体１５の下方に位置する缶胴連結部１６の肉厚についてはこの限りではなく、缶胴連結部１６は、缶胴本体１５から缶底１２側へ向かうに従い漸次肉厚が大きくされている。   Of the can body 11 shown in FIG. 5, the thickness of the can body connecting portion 16 located below the can body main body 15 is not limited to this, and the can body connecting portion 16 extends from the can body main body 15 to the can bottom 12. The wall thickness is gradually increased toward the side.

また図４及び図５において、ＤＩ工程では、ＤＩ缶Ｗ２における缶胴１１の外周面全体を、一定の外径に成形する。つまり、缶胴本体１５の外周面と、缶胴連結部１６の外周面とを、互いに同径に、かつ互いの間に段部（段差）を形成することなく面一に成形する。   4 and 5, in the DI process, the entire outer peripheral surface of the can body 11 in the DI can W2 is formed to have a constant outer diameter. That is, the outer peripheral surface of the can body main body 15 and the outer peripheral surface of the can body connecting portion 16 are formed to have the same diameter and to be flush with each other without forming a step portion (step) between them.

具体的に本実施形態では、ＤＩ工程において、缶胴本体１５の外周面を、缶軸Ｏ方向の全域にわたって一定の外径に成形する。つまり、缶胴本体１５の外周面全体（上端部（開口端部１１ａ）及び該上端部の下方に連なる部位の全て）を、一定の外径とする。
また、ＤＩ工程において、缶胴本体１５の内周面を、缶軸Ｏ方向の全域にわたって一定の内径に成形する。これにより、図５に符号ｔで示される缶胴本体１５の肉厚は、缶軸Ｏ方向の全域にわたって（具体的には缶胴本体１５全体において）、一定の厚さに成形される。 Specifically, in the present embodiment, in the DI process, the outer peripheral surface of the can body main body 15 is formed to have a constant outer diameter over the entire area in the can axis O direction. In other words, the entire outer peripheral surface of the can body main body 15 (the upper end portion (opening end portion 11a) and all of the portions connected below the upper end portion) has a constant outer diameter.
Further, in the DI process, the inner peripheral surface of the can body main body 15 is formed to have a constant inner diameter over the entire region in the can axis O direction. As a result, the thickness of the can body main body 15 indicated by the symbol t in FIG. 5 is formed to a constant thickness over the entire region in the can axis O direction (specifically, the entire can body main body 15).

またＤＩ工程では、缶胴本体１５の下方に位置する缶胴連結部１６の外周面についても、缶軸Ｏ方向の全域にわたって一定の外径に成形する。つまり、缶胴連結部１６の外周面全体を、一定の外径とする。
また、ＤＩ工程では、缶胴連結部１６の内周面を、缶軸Ｏ方向の下方に向かうに従い漸次内径が小さくなるように成形する。これにより、缶胴連結部１６の肉厚は、缶軸Ｏ方向の下方に向かうに従い漸次径方向の内側へ向けて厚さを増大させるように成形される。 Further, in the DI process, the outer peripheral surface of the can body coupling portion 16 located below the can body main body 15 is also formed with a constant outer diameter over the entire region in the can axis O direction. That is, the entire outer peripheral surface of the can body coupling portion 16 is set to have a constant outer diameter.
In the DI process, the inner peripheral surface of the can body connecting portion 16 is formed so that the inner diameter gradually decreases as it goes downward in the can axis O direction. Thereby, the wall thickness of the can body coupling | bond part 16 is shape | molded so that thickness may increase toward the inner side of a radial direction gradually as it goes below the can axis | shaft O direction.

図３（ｃ）に示されるように、カッピング工程及びＤＩ工程を経たＤＩ缶Ｗ２の開口端部１１ａは、周方向に向かうに従い上下に波打つような凹凸形状（凹凸波形状）に形成されている。なお、この凹凸波形状は、板材Ｗをカップ状体Ｗ１に成形したときから付与されるものである。
開口端部１１ａの凹凸波形状をなす上端縁のうち、上方に突出する山となっている部分（凸部）は、耳２０と呼ばれる。耳２０は、開口端部１１ａにおいて周方向に沿って複数形成される。これらの耳２０は、例えばアルミニウム合金の結晶学的異方性に起因して生じるものである。 As shown in FIG. 3C, the opening end 11a of the DI can W2 that has undergone the cupping process and the DI process is formed in an uneven shape (uneven wave shape) that waves up and down as it goes in the circumferential direction. . In addition, this uneven | corrugated wave shape is provided from the time of shape | molding the board | plate material W in the cup-shaped body W1.
A portion (convex portion) that is a peak projecting upward in the upper end edge of the concavo-convex wave shape of the opening end portion 11 a is called an ear 20. A plurality of ears 20 are formed along the circumferential direction at the open end 11a. These ears 20 are caused by, for example, the crystallographic anisotropy of an aluminum alloy.

[トリミング工程]
次に、ＤＩ缶Ｗ２の開口端部１１ａをトリミング加工する。
すなわち、上記ＤＩ加工装置によって形成されたＤＩ缶Ｗ２の開口端部１１ａは、耳２０が形成されて高さが不均一であるため、このＤＩ缶Ｗ２の開口端部１１ａを切断してトリミングすることにより、図３（ｄ）に示されるように、缶胴１１の開口端部１１ａにおける缶軸Ｏ方向に沿う周壁の高さを、全周にわたって均等に揃える。
これにより、缶胴１１の開口端部１１ａに耳２０を有さない（耳２０が切除された）、トリミング加工後のＤＩ缶１０が得られる。なお、このＤＩ缶１０における缶軸Ｏ方向の高さ（缶底１２の下端（接地部１２ｂ）から開口端部１１ａの上端までの高さ）は、例えば、３５０ｍｌ缶の場合には１２４ｍｍ程度であり、５００ｍｌ缶の場合には１６８ｍｍ程度である。 [Trimming process]
Next, the opening end 11a of the DI can W2 is trimmed.
That is, the opening end 11a of the DI can W2 formed by the DI processing apparatus has the ears 20 formed therein and the height thereof is non-uniform, so the opening end 11a of the DI can W2 is cut and trimmed. Thus, as shown in FIG. 3D, the height of the peripheral wall along the can axis O direction at the opening end portion 11 a of the can body 11 is made uniform over the entire circumference.
Thereby, the DI can 10 after the trimming process is obtained which does not have the ear 20 at the opening end portion 11a of the can body 11 (the ear 20 is cut off). The height of the DI can 10 in the direction of the can axis O (the height from the lower end of the can bottom 12 (grounding portion 12b) to the upper end of the open end 11a) is, for example, about 124 mm in the case of a 350 ml can. Yes, in the case of a 500 ml can, it is about 168 mm.

[印刷工程、塗装工程]
このＤＩ缶１０を洗浄し、潤滑油等を除去した後に、表面処理を施して乾燥し、次いで外面印刷、外面塗装を施し、その後内面塗装を施す。
具体的に、印刷工程では、印刷用インクを使用して、ＤＩ缶１０の缶胴１１に外面印刷を施す。
次に、塗装工程では、外面塗装を施した後、内面塗装を施す。詳しくは、例えば、ポリエステル系塗料を使用して、ＤＩ缶１０の缶胴１１の外面に塗装をし、この外面塗装がされたＤＩ缶１０をオーブンで加熱乾燥する。なお、オーブンにより加熱乾燥する際は、缶胴１１の開口端部１１ａから内部へ向けて、略水平方向に延在する搬送用ピンが挿入され、該搬送用ピンがＤＩ缶１０を支持しつつ、チェーンやモータ等を備えた駆動機構により、移動させられる。次いで、ＤＩ缶１０の缶胴１１及び缶底１２の内面に、例えば、エポキシ系塗料を使用して塗装をし、この内面塗装がされたＤＩ缶１０をオーブンで加熱乾燥する。 [Printing process, painting process]
After cleaning this DI can 10 and removing lubricating oil, etc., it is subjected to a surface treatment and dried, followed by outer surface printing and outer surface coating, and then inner surface coating.
Specifically, in the printing process, external printing is performed on the can body 11 of the DI can 10 using printing ink.
Next, in the painting process, after applying the outer surface coating, the inner surface coating is performed. Specifically, for example, a polyester-based paint is used to coat the outer surface of the can body 11 of the DI can 10, and the DI can 10 that has been coated with the outer surface is heated and dried in an oven. When drying by heating in an oven, a transfer pin extending in a substantially horizontal direction is inserted from the open end 11 a of the can body 11 into the inside, and the transfer pin supports the DI can 10. It is moved by a drive mechanism equipped with a chain, a motor and the like. Next, the inner surface of the can body 11 and the bottom 12 of the DI can 10 is coated using, for example, an epoxy paint, and the DI can 10 coated with the inner surface is heated and dried in an oven.

[縮径工程（くびれ部成形工程）]
次に、図７（ａ）に示されるように、ＤＩ缶１０の缶胴１１の内部及び外部に縮径用金型３５、３６を嵌合し、図４に示されるように、該缶胴１１のうち開口端部１１ａよりも缶底１２側に位置する縮径予定部１８に、缶軸Ｏ方向に沿って缶底１２から開口端部１１ａ側へ向かうに従い小径となる縮径加工を施す。 [Reducing diameter process (constriction part forming process)]
Next, as shown in FIG. 7 (a), the diameter reducing molds 35 and 36 are fitted inside and outside the can body 11 of the DI can 10, and as shown in FIG. 11 is subjected to a diameter reduction process that decreases in diameter toward the opening end 11a side from the can bottom 12 along the can axis O direction on the diameter reduction planned portion 18 positioned closer to the can bottom 12 than the opening end 11a. .

縮径予定部１８は、缶胴本体１５における開口端部１１ａ以外の部位に位置しており、具体的には、開口端部１１ａから下方に離間して配置されている。
本実施形態の例では、図４において縮径予定部１８は、缶胴本体１５における上端部（開口端部１１ａ）と下端部の間に配置されている。 The planned diameter reduction portion 18 is located at a portion other than the opening end portion 11a in the can body main body 15, and specifically, is arranged to be spaced downward from the opening end portion 11a.
In the example of this embodiment, in FIG. 4, the planned diameter reduction portion 18 is disposed between the upper end portion (open end portion 11 a) and the lower end portion of the can body main body 15.

具体的には、図７（ａ）において、縮径用金型として、缶胴１１の内部に嵌合するパンチ３５と、缶胴１１の外部に嵌合するダイス３６と、が用いられる。これら縮径用金型３５、３６の各中心軸は、缶軸Ｏと同軸に配置される。そして、これらパンチ３５とダイス３６との間で、缶胴１１の開口端部１１ａから縮径予定部１８までの領域全体を縮径加工する。   Specifically, in FIG. 7A, a punch 35 that fits inside the can body 11 and a die 36 that fits outside the can body 11 are used as the diameter reducing mold. The central axes of the diameter-reducing molds 35 and 36 are arranged coaxially with the can axis O. Then, between these punches 35 and the die 36, the entire region from the opening end portion 11a of the can body 11 to the diameter reduction planned portion 18 is reduced.

すなわち、縮径工程では、縮径用金型３５、３６を、ＤＩ缶１０の上方に離間させて配置した状態から、これらの縮径用金型３５、３６とＤＩ缶１０とを缶軸Ｏ方向に相対的に接近移動させつつ、縮径用金型のパンチ３５とダイス３６の間に、ＤＩ缶１０の缶胴１１をその開口端部１１ａから進入させて、該缶胴１１の開口端部１１ａから縮径予定部１８までの領域の全体を、縮径加工していく。   That is, in the diameter reducing step, the diameter reducing molds 35 and 36 are disposed above the DI can 10 so as to be spaced apart from each other, and then the diameter reducing molds 35 and 36 and the DI can 10 are connected to the can axis O. The can body 11 of the DI can 10 is entered from the opening end portion 11a between the punch 35 and the die 36 of the diameter-reducing mold while moving relatively close to each other direction. The entire region from the portion 11a to the planned diameter reduction portion 18 is reduced in diameter.

詳しくは、パンチ３５の外周面のうち、缶軸Ｏ方向（パンチ３５の中心軸方向）に沿う缶胴１１の開口端部１１ａから縮径予定部１８までの領域に対応する部位は、一定の外径に形成されている。
また、ダイス３６の内周面のうち、缶軸Ｏ方向（ダイス３６の中心軸方向）に沿う缶胴１１の開口端部１１ａから縮径予定部１８の上方に隣り合う部分（拡径予定部１９）までの領域に対応する部位は、一定の内径に形成されている。また、ダイス３６の内周面のうち、缶胴１１の縮径予定部１８に対応する部位は、上方に向かうに従い漸次縮径するテーパ面に形成されている。 Specifically, a portion of the outer peripheral surface of the punch 35 corresponding to a region from the opening end portion 11a of the can body 11 along the can axis O direction (the central axis direction of the punch 35) to the planned diameter reduction portion 18 is constant. The outer diameter is formed.
Further, of the inner peripheral surface of the die 36, a portion adjacent to the upper diameter-reducing portion 18 from the opening end portion 11 a of the can body 11 along the can axis O direction (the central axis direction of the die 36). The site | part corresponding to the area | region to 19) is formed in the fixed internal diameter. Moreover, the site | part corresponding to the diameter reduction scheduled part 18 of the can body 11 among the internal peripheral surfaces of the die | dye 36 is formed in the taper surface which diameter-reduces gradually as it goes upwards.

そして縮径加工時には、縮径用金型３５、３６のうち、まずパンチ３５が、ＤＩ缶１０に対して缶軸Ｏ方向に接近（前進）移動しつつ缶胴１１内部に嵌合させられ、次にダイス３６が、ＤＩ缶１０に対して缶軸Ｏ方向に接近（前進）移動しつつ缶胴１１外部に嵌合させられて、缶胴１１の開口端部１１ａから縮径予定部１８までの領域に縮径加工が施される。
また縮径加工後は、縮径用金型３５、３６のうち、まずダイス３６が、ＤＩ缶１０に対して缶軸Ｏ方向に離間（後退）移動しつつ缶胴１１外部から離脱させられ、次にパンチ３５が、ＤＩ缶１０に対して缶軸Ｏ方向に離間（後退）移動しつつ缶胴１１内部から離脱させられて、縮径用金型３５、３６は元の位置（加工準備位置、待機位置）に戻る。 At the time of diameter reduction processing, first, the punch 35 out of the diameter reduction dies 35 and 36 is fitted into the inside of the can body 11 while moving (advancing) in the direction of the can axis O with respect to the DI can 10. Next, the die 36 is fitted to the outside of the can body 11 while moving (advancing) in the direction of the can axis O with respect to the DI can 10, and from the open end 11 a of the can body 11 to the planned diameter reduction portion 18. The diameter reduction process is performed on the region.
In addition, after the diameter reduction processing, the die 36 of the diameter reduction dies 35 and 36 is first separated from the outside of the can body 11 while being moved away (retracted) in the direction of the can axis O with respect to the DI can 10. Next, the punch 35 is moved away from the DI can 10 in the direction of the can axis O while being moved away (retracted) from the inside of the can body 11, so that the diameter reducing dies 35 and 36 are moved to their original positions (processing preparation positions). To the standby position).

なお、パンチ３５及びダイス３６が、ＤＩ缶１０の缶胴１１に嵌合するタイミングは、本実施形態で説明したものに限られるわけではなく、例えばこれらパンチ３５及びダイス３６が、ＤＩ缶１０に対して同時に接近移動又は／及び離間移動するようにしてもよい。   The timing at which the punch 35 and the die 36 are fitted to the can body 11 of the DI can 10 is not limited to that described in the present embodiment. For example, the punch 35 and the die 36 are attached to the DI can 10. On the other hand, you may make it approach and / or move away simultaneously.

本実施形態では、縮径予定部１８に、縮径用金型３５、３６の加工径を段階的に小さくしながら複数回の縮径加工を施すことにより、図４に示される縦断面視で凹曲線状をなすくびれ部１７のうち、下側部分を成形する。また、複数回の縮径加工ではそれぞれ、上述した縮径工程と同様に、缶胴１１の開口端部１１ａから縮径予定部１８までの領域全体に、縮径加工が施される。
このように、複数回の縮径加工を施すことにより、缶胴１１を損傷させることなく、縮径予定部１８を大きく傾斜させたり、広範囲に傾斜させることができ、くびれ部１７を種々の形状にくびれさせることが可能になる。 In the present embodiment, the diameter reduction portion 18 is subjected to diameter reduction processing a plurality of times while gradually reducing the processing diameters of the diameter reduction dies 35 and 36 in a stepwise manner, in a longitudinal sectional view shown in FIG. The lower portion of the constricted portion 17 having a concave curve shape is formed. In each of the plurality of diameter reduction processes, the diameter reduction process is performed on the entire region from the opening end portion 11a of the can body 11 to the diameter reduction scheduled portion 18 in the same manner as the diameter reduction process described above.
Thus, by performing the diameter reduction processing a plurality of times, the diameter reduction planned portion 18 can be greatly inclined or inclined in a wide range without damaging the can body 11, and the constricted portion 17 can be formed in various shapes. It becomes possible to constrict.

なお、縮径加工の回数は上記複数回に限定されるものではなく、例えば、前述した特許文献４（特開２００３−３０５５２３号公報）に示されるようなくびれ部形状の場合には、縮径加工を１回のみ行うこととしてもよい。   The number of times of diameter reduction processing is not limited to the above plural times. For example, in the case of a constricted portion shape as shown in Patent Document 4 (Japanese Patent Laid-Open No. 2003-305523) described above, the diameter reduction processing is performed. Processing may be performed only once.

[拡径工程（くびれ部成形工程）]
次に、図７（ｂ）に示されるように、ＤＩ缶１０の缶胴１１の内部に拡径用金型４０を嵌合し、図４に示されるように、該缶胴１１のうち開口端部１１ａと縮径予定部１８との間に位置する拡径予定部１９に、缶軸Ｏ方向に沿って缶底１２から開口端部１１ａ側へ向かうに従い大径となる拡径加工を施す。 [Diameter expansion process (constriction part forming process)]
Next, as shown in FIG. 7B, a diameter-expansion mold 40 is fitted into the inside of the can body 11 of the DI can 10, and as shown in FIG. The diameter-expanded portion 19 located between the end portion 11a and the diameter-reduced portion 18 is subjected to diameter-expansion processing that increases in diameter as it goes from the can bottom 12 toward the opening end portion 11a along the can axis O direction. .

拡径予定部１９は、缶胴本体１５における開口端部１１ａ及び縮径予定部１８以外の部位に位置しており、具体的には、開口端部１１ａから下方に離間して配置されているとともに、縮径予定部１８の上方に隣接配置される。
なお、拡径予定部１９は、縮径予定部１８の上方に離間して配置されていてもよい。この場合、拡径加工後において、これら拡径予定部１９と縮径予定部１８との間に、例えば缶軸Ｏ方向に沿って一定の直径とされる小径部が形成されてもよい。
本実施形態の例では、図４において拡径予定部１９は、缶胴本体１５における上端部（開口端部１１ａ）と下端部の間に配置されている。 The diameter expansion scheduled portion 19 is located in a portion other than the opening end portion 11a and the diameter reduction scheduled portion 18 in the can body main body 15, and specifically, is arranged to be spaced downward from the opening end portion 11a. At the same time, it is arranged adjacent to the upper portion of the diameter reduction portion 18.
In addition, the diameter expansion plan part 19 may be spaced apart above the diameter reduction plan part 18. In this case, a small-diameter portion having a constant diameter, for example, along the can axis O direction may be formed between the diameter-expanded portion 19 and the diameter-reduced portion 18 after the diameter expansion process.
In the example of the present embodiment, the diameter expansion scheduled portion 19 in FIG. 4 is disposed between the upper end portion (opening end portion 11a) and the lower end portion of the can body main body 15.

具体的には、図７（ｂ）において、拡径用金型として、缶胴１１の内部に嵌合するパンチ４０が用いられる。拡径用金型４０の中心軸は、缶軸Ｏと同軸に配置される。そして、パンチ４０を缶胴１１の内部に挿入することによって、該缶胴１１の開口端部１１ａから拡径予定部１９までの領域全体を拡径加工する。   Specifically, in FIG. 7B, a punch 40 that fits into the inside of the can body 11 is used as a mold for expanding the diameter. The central axis of the diameter expanding mold 40 is arranged coaxially with the can axis O. Then, by inserting the punch 40 into the inside of the can body 11, the entire region from the opening end portion 11 a of the can body 11 to the diameter expansion scheduled portion 19 is subjected to diameter expansion processing.

すなわち、拡径工程では、拡径用金型４０を、ＤＩ缶１０の上方に離間させて配置した状態から、拡径用金型４０とＤＩ缶１０とを缶軸Ｏ方向に相対的に接近移動させつつ、拡径用金型４０を、ＤＩ缶１０の缶胴１１内にその開口端部１１ａから進入させて、該缶胴１１の開口端部１１ａから拡径予定部１９までの領域の全体を、拡径加工していく。   That is, in the diameter expansion process, the diameter expansion mold 40 and the DI can 10 are relatively close to each other in the direction of the can axis O from the state in which the diameter expansion mold 40 is disposed above the DI can 10. While moving, the diameter-expansion mold 40 is made to enter the can body 11 of the DI can 10 from the opening end portion 11 a thereof, and the region from the opening end portion 11 a of the can body 11 to the diameter-expanding portion 19 is increased. The whole is expanded.

詳しくは、パンチ４０の外周面のうち、缶軸Ｏ方向（パンチ４０の中心軸方向）に沿う缶胴１１の開口端部１１ａから拡径予定部１９の上方に隣り合う部分までの領域に対応する部位は、一定の外径に形成されている。また、パンチ４０の外周面のうち、缶胴１１の拡径予定部１９に対応する部位は、上方に向かうに従い漸次拡径するテーパ面に形成されている。   Specifically, in the outer peripheral surface of the punch 40, it corresponds to a region from the opening end portion 11 a of the can body 11 along the can axis O direction (the central axis direction of the punch 40) to a portion adjacent to the upper portion of the diameter expansion scheduled portion 19. The part to be formed is formed with a constant outer diameter. Moreover, the site | part corresponding to the diameter expansion plan part 19 of the can body 11 among the outer peripheral surfaces of the punch 40 is formed in the taper surface which expands gradually as it goes upwards.

そして拡径加工時には、拡径用金型のパンチ４０が、ＤＩ缶１０に対して缶軸Ｏ方向に接近（前進）移動しつつ缶胴１１内部に嵌合させられて、缶胴１１の開口端部１１ａから拡径予定部１９までの領域に拡径加工が施される。
また拡径加工後は、パンチ４０が、ＤＩ缶１０に対して缶軸Ｏ方向に離間（後退）移動しつつ缶胴１１内部から離脱させられて、パンチ４０は元の位置（加工準備位置、待機位置）に戻る。
なお、パンチ４０が缶胴１１を拡径加工する部位は、該缶胴１１のうち上述の縮径工程において縮径加工された部分よりも上方であり、よって拡径加工後において、前記縮径加工された部分の形状は維持される。 During diameter expansion processing, the diameter expansion die punch 40 is fitted into the can body 11 while moving (advancing) in the direction of the can axis O with respect to the DI can 10, thereby opening the can body 11. A diameter expansion process is performed in a region from the end portion 11 a to the diameter expansion scheduled portion 19.
Further, after the diameter expansion processing, the punch 40 is separated from the inside of the can body 11 while being moved away (retracted) in the direction of the can axis O with respect to the DI can 10, and the punch 40 is moved to the original position (processing preparation position, Return to the standby position.
The portion where the punch 40 expands the can body 11 is above the portion of the can body 11 which has been subjected to the diameter reduction process in the above-described diameter reduction step. The shape of the processed part is maintained.

本実施形態では、拡径予定部１９に、拡径用金型４０の加工径を段階的に大きくしながら複数回の拡径加工を施すことにより、図４に示される縦断面視で凹曲線状をなすくびれ部１７のうち、上側部分を成形する。また、複数回の拡径加工ではそれぞれ、上述した拡径工程と同様に、缶胴１１の開口端部１１ａから拡径予定部１９までの領域全体に、拡径加工が施される。
このように、複数回の拡径加工を施すことにより、缶胴１１を損傷させることなく、拡径予定部１９を大きく傾斜させたり、広範囲に傾斜させることができ、くびれ部１７を種々の形状にくびれさせることが可能になる。 In the present embodiment, the diameter-expanded portion 19 is subjected to diameter expansion processing a plurality of times while gradually increasing the processing diameter of the diameter expansion mold 40, thereby forming a concave curve in the longitudinal sectional view shown in FIG. 4. The upper portion of the constricted portion 17 is formed. Further, in each of the plurality of diameter expansion processes, the diameter expansion process is performed on the entire region from the opening end portion 11a of the can body 11 to the diameter expansion scheduled portion 19 in the same manner as the diameter expansion process described above.
As described above, by performing the diameter expansion process a plurality of times, the diameter expansion scheduled portion 19 can be greatly inclined or inclined in a wide range without damaging the can body 11, and the constricted portion 17 can be formed in various shapes. It becomes possible to constrict.

なお、拡径加工の回数は上記複数回に限定されるものではなく、例えば、前述した特許文献４（特開２００３−３０５５２３号公報）に示されるようなくびれ部形状の場合には、拡径加工を１回のみ行うこととしてもよい。   The number of times of diameter expansion processing is not limited to the above plural times. For example, in the case of a constricted portion shape as shown in Patent Document 4 (Japanese Patent Laid-Open No. 2003-305523) described above, the diameter expansion is performed. Processing may be performed only once.

このようにくびれ部成形工程（縮径工程及び拡径工程）が施されることにより、缶胴１１に、くびれ部１７が成形される。
具体的に本実施形態では、くびれ部成形工程において、缶胴１１の縮径予定部１８に複数回の縮径加工を施した後、拡径予定部１９に複数回の拡径加工を施すことにより、図４に示されるＤＩ缶１０の縦断面視で、缶胴１１の内側へ向けて窪む凹曲線状のくびれ部１７を成形している。 As described above, the constricted portion 17 is formed in the can body 11 by performing the constricted portion forming step (the diameter reducing step and the diameter expanding step).
Specifically, in the present embodiment, in the constricted part forming step, after the diameter reduction scheduled part 18 of the can body 11 is subjected to the diameter reduction process a plurality of times, the diameter expansion scheduled part 19 is subjected to the diameter expansion process a plurality of times. Thus, a concave curved constricted portion 17 that is recessed toward the inside of the can body 11 is formed in a longitudinal sectional view of the DI can 10 shown in FIG. 4.

[ネッキング工程]
次いで、ＤＩ缶１０にネッキング加工を施す。
本実施形態では、ネッキング用金型（縮径用金型）を用いて、缶胴１１の開口端部１１ａに、滑らかな傾斜形状を備えたネック部１３と、フランジ予定部１４と、をネッキング加工により成形する。
具体的には、図７（ｃ）に示されるように、ＤＩ缶１０の缶胴１１の内部及び外部にネッキング用金型４５、４６を嵌合し、図４に示されるように、該缶胴１１における開口端部１１ａに、上方へ向かうに従い小径となるネック部１３と、ネック部１３の上方に隣接配置される円筒状のフランジ予定部１４と、を成形する。
なお、缶胴１１においてネック部１３及びフランジ予定部１４となる予定部は、開口端部１１ａの上端から下方へ向けて例えば２２ｍｍ程度の範囲である。また、ネック部１３及びフランジ予定部１４となる予定部の範囲は、３５０ｍｌ缶の場合と５００ｍｌ缶の場合とで、互いに略同一である。 [Necking process]
Next, the DI can 10 is necked.
In the present embodiment, a necking portion 13 having a smooth inclined shape and a planned flange portion 14 are necked at the opening end portion 11a of the can body 11 using a necking die (diameter for reducing diameter). Molded by processing.
Specifically, as shown in FIG. 7 (c), necking dies 45 and 46 are fitted inside and outside the can body 11 of the DI can 10, and as shown in FIG. A neck portion 13 having a smaller diameter as it goes upward and a cylindrical flange planned portion 14 disposed adjacent to the upper portion of the neck portion 13 are formed on the opening end portion 11 a of the body 11.
In addition, in the can body 11, the planned portions to be the neck portion 13 and the planned flange portion 14 are in a range of, for example, about 22 mm from the upper end of the opening end portion 11a downward. Moreover, the range of the planned part which becomes the neck part 13 and the flange planned part 14 is substantially the same between the case of the 350 ml can and the case of the 500 ml can.

具体的には、図７（ｃ）において、ネッキング用金型として、缶胴１１の内部に嵌合するパンチ４５と、缶胴１１の外部に嵌合するダイス４６と、が用いられる。これらネッキング用金型４５、４６の各中心軸は、缶軸Ｏと同軸に配置される。そして、これらパンチ４５とダイス４６との間で、缶胴１１の開口端部１１ａをネッキング加工する。   Specifically, in FIG. 7C, a punch 45 that fits inside the can body 11 and a die 46 that fits outside the can body 11 are used as a necking die. The central axes of these necking dies 45 and 46 are arranged coaxially with the can axis O. Then, the opening end 11 a of the can body 11 is necked between the punch 45 and the die 46.

すなわち、ネッキング工程では、ネッキング用金型４５、４６を、ＤＩ缶１０の上方に離間させて配置した状態から、これらのネッキング用金型４５、４６とＤＩ缶１０とを缶軸Ｏ方向に相対的に接近移動させつつ、ネッキング用金型のパンチ４５とダイス４６の間に、ＤＩ缶１０の缶胴１１をその開口端部１１ａから進入させて、該缶胴１１の開口端部１１ａを、縮径加工していく。   That is, in the necking step, the necking dies 45 and 46 are arranged in a spaced relationship above the DI can 10 so that the necking dies 45 and 46 and the DI can 10 are relative to each other in the direction of the can axis O. The can body 11 of the DI can 10 is made to enter from the opening end portion 11a between the punch 45 and the die 46 of the necking die while moving close to each other, and the opening end portion 11a of the can body 11 is moved. Reduce diameter.

なお、ネッキング用金型４５、４６により缶胴１１の開口端部１１ａを縮径加工する具体的な工程については、上述のくびれ部成形工程における縮径工程と略同様であるため、ここでは説明を省略する。   The specific process of reducing the diameter of the open end 11a of the can body 11 with the necking dies 45 and 46 is substantially the same as the diameter reducing process in the above-described constricted part forming process, and will be described here. Is omitted.

なお、ネッキング工程では、上述のネッキング用金型４５、４６を用いたネッキング加工に代えて、缶胴１１の開口端部１１ａをスピンフローネッキング加工により成形してもよい。
スピンフローネッキング装置は、予めダイネッキングにより缶胴１１の開口端部１１ａ周辺にプレネックが施されたＤＩ缶１０の缶底１２を吸着支持するベースパッドと、該ベースパッドによりＤＩ缶１０を缶軸Ｏ回りに回転させながらＤＩ缶１０の開口端部１１ａ周辺に嵌入されるスライドロールと、該スライドロールより小径でＤＩ缶１０の内部に挿入される内部ロールと、缶の外部に配置されＤＩ缶１０の径方向に往復移動可能に設けられる成形ロール（外部ロール）と、を備える。
このスピンフローネッキング装置により、ＤＩ缶１０の缶胴１１を内部ロールと成形ロールとの間に挟んで開口端部１１ａの上端に向けて縮径し、ネック部１３及びフランジ予定部１４を成形する。 In the necking step, the opening end portion 11a of the can body 11 may be formed by spin flow necking instead of the necking using the necking molds 45 and 46 described above.
The spin flow necking device includes a base pad that adsorbs and supports a can bottom 12 of a DI can 10 that is pre-necked around the open end 11a of the can body 11 by die-necking, and a can shaft that supports the DI can 10 with the base pad. A slide roll inserted around the open end 11a of the DI can 10 while rotating around the O, an internal roll inserted into the DI can 10 with a smaller diameter than the slide roll, and a DI can placed outside the can 10 forming rolls (external rolls) provided so as to be reciprocally movable in the radial direction.
With this spin flow necking device, the can body 11 of the DI can 10 is sandwiched between the inner roll and the forming roll, and the diameter is reduced toward the upper end of the opening end portion 11a to form the neck portion 13 and the flange preliminarily portion 14. .

[フランジング工程]
次いで、缶胴１１の開口端部１１ａに位置するフランジ予定部１４をフランジング加工して、ネック部１３の上端から径方向外側へ向けて突出するとともに周方向に沿って延びる環状のフランジ部（不図示）を成形する。フランジ部の成形にあたっては、金型（パンチ）を用いてフランジ予定部１４をフランジング加工してもよいし、或いは、スピンフロー成形によりフランジング加工してもよい。 [Flanging process]
Next, the flange portion 14 which is located at the opening end portion 11a of the can body 11 is subjected to flanging processing, and protrudes radially outward from the upper end of the neck portion 13 and extends along the circumferential direction ( (Not shown). In forming the flange portion, the pre-flange portion 14 may be flanged using a mold (punch), or may be flanged by spin flow molding.

このようにしてＤＩ缶１０が製造され、フランジング工程の後工程へと搬送される。この後工程では、ＤＩ缶１０の内部に飲料等の内容物が充填され、フランジ部に缶蓋が巻締められて、缶体が密封される。   In this way, the DI can 10 is manufactured and conveyed to the subsequent process of the flanging process. In this post process, the DI can 10 is filled with contents such as a beverage, a can lid is wound around the flange portion, and the can body is sealed.

以上説明した本実施形態に係るＤＩ缶１０の製造方法においてＤＩ工程に用いられるパンチスリーブ３０、及びこれを用いたＤＩ缶１０の製造方法では、パンチスリーブ３０の外周面のうち、該パンチスリーブ３０により成形される缶胴１１の缶軸Ｏ方向に沿う少なくとも開口端部１１ａから拡径予定部１９を含む縮径予定部１８までの領域に対応する範囲における、開口端部１１ａに対応する部分と、開口端部１１ａ以外の部位に対応する部分と、の外径差が、１０μｍ未満とされている。つまり、このパンチスリーブ３０は概ね一定の外径に形成されている。
従って、このパンチスリーブ３０を用いたＤＩ加工（ＤＩ工程）において、缶胴１１のうち、缶軸Ｏ方向に沿う少なくとも開口端部１１ａから拡径予定部１９を含む縮径予定部１８までの領域を、例えば缶胴１１の肉厚差が１５μｍ以下となるように、一定の肉厚（互いに同一の肉厚）で成形することができる。 In the punch sleeve 30 used in the DI process in the method for manufacturing the DI can 10 according to the present embodiment described above, and the method for manufacturing the DI can 10 using the punch sleeve 30, the punch sleeve 30 of the outer peripheral surface of the punch sleeve 30 is used. A portion corresponding to the opening end portion 11a in a range corresponding to at least the opening end portion 11a along the can axis O direction of the can body 11 formed by The difference in outer diameter from the portion corresponding to the portion other than the opening end portion 11a is less than 10 μm. That is, the punch sleeve 30 is formed with a substantially constant outer diameter.
Therefore, in the DI processing (DI process) using the punch sleeve 30, in the can body 11, a region from at least the opening end portion 11 a along the can axis O direction to the diameter reduction planned portion 18 including the diameter expansion scheduled portion 19. Can be formed with a constant thickness (the same thickness as each other) such that the difference in thickness of the can body 11 is 15 μm or less, for example.

具体的には、ＤＩ工程において上記パンチスリーブ３０を使用することにより、缶胴１１における開口端部１１ａ、拡径予定部１９及び縮径予定部１８の内周面を、例えば互いの内周面同士が面一となるように成形することができる。また、缶胴１１における開口端部１１ａ、拡径予定部１９及び縮径予定部１８の外周面については、従来と同様のＤＩ加工により、互いの外周面同士が面一となるように、かつ、互いの間に段部（段差）を形成することなく、平坦に成形できる。
従って、缶胴１１のうち缶軸Ｏ方向に沿う少なくとも開口端部１１ａから縮径予定部１８までの領域を、一定の肉厚（厚さ）でＤＩ加工できるのである。
これにより、ＤＩ工程後にＤＩ缶１０に施されるくびれ部成形工程（缶胴１１の縮径予定部１８に縮径加工を施し（縮径工程）、次いで缶胴１１の拡径予定部１９に拡径加工を施す（拡径工程））において、下記の優れた作用効果を奏する。 Specifically, by using the punch sleeve 30 in the DI process, the inner peripheral surfaces of the opening end portion 11a, the diameter expansion planned portion 19 and the diameter reduction planned portion 18 in the can body 11 are, for example, the inner peripheral surfaces of each other. They can be molded so that they are flush with each other. Moreover, about the outer peripheral surface of the opening end part 11a, the diameter expansion plan part 19 and the diameter reduction plan part 18 in the can body 11, by the same DI processing as in the past, the outer peripheral surfaces are flush with each other, and , And can be formed flat without forming a step (step) between them.
Therefore, at least the region from the opening end portion 11a to the reduced diameter planned portion 18 along the can axis O direction in the can body 11 can be DI processed with a constant thickness (thickness).
Accordingly, a constriction portion forming step (reducing diameter of the diameter reduction planned portion 18 of the can body 11 (diameter reduction step) applied to the DI can 10 after the DI step is performed, and then to the diameter expansion scheduled portion 19 of the can body 11. In performing the diameter expansion process (diameter expansion process), the following excellent effects are exhibited.

すなわち、くびれ部成形工程において、缶胴１１の内部及び外部に縮径用金型（パンチ３５及びダイス３６）を嵌合し、縮径予定部１８を縮径加工するにあたり、各縮径用金型（パンチ３５、ダイス３６）と、缶胴１１との径方向の隙間（金型３５、３６と缶胴１１とのクリアランス）を、例えば２５μｍ以下程度にまで小さく抑えることができる。
詳しくは、上述のように、缶胴１１の缶軸Ｏ方向に沿う少なくとも開口端部１１ａから縮径予定部１８までの領域を「一定の肉厚」にＤＩ成形した中でも、厳密には、成形後の缶胴１１の前記領域には僅かに肉厚差が生じている。そこで、缶胴１１の前記領域のうち肉厚が最も大きくなる部分の前記クリアランスを１０μｍに設定し、缶胴１１の前記領域における最大肉厚差が１５μｍである場合に、これらの和（２５μｍ）以下にまで、実際の前記クリアランスが抑えられる。 That is, in the constriction portion forming step, each of the diameter reduction molds is used when the diameter reduction mold (punch 35 and die 36) is fitted inside and outside the can body 11 and the diameter reduction expected portion 18 is reduced. A radial gap (clearance between the molds 35 and 36 and the can body 11) between the mold (punch 35 and die 36) and the can body 11 can be suppressed to, for example, about 25 μm or less.
Specifically, as described above, even though the region from at least the open end portion 11a to the planned diameter reduction portion 18 along the can axis O direction of the can body 11 is DI-molded to a “constant thickness”, strictly speaking, molding is performed. There is a slight thickness difference in the area of the rear can body 11. Therefore, when the clearance of the portion where the thickness is the largest in the region of the can body 11 is set to 10 μm, and the maximum thickness difference in the region of the can body 11 is 15 μm, these sums (25 μm) The actual clearance is reduced to the following.

具体的に、縮径加工時においては、缶胴１１の外部に配置される縮径用金型（ダイス３６）と、缶胴１１とは、該缶胴１１の開口端部１１ａから縮径予定部１８までの領域全体において密着させられる。また、缶胴１１の内部に配置される縮径用金型（パンチ３５）と、該缶胴１１における縮径予定部１８よりも開口端部１１ａ側に位置する部位とは、その径方向の隙間が上記クリアランス程度にまで小さく抑えられて接近配置される。   Specifically, at the time of diameter reduction processing, the diameter reduction die (die 36) disposed outside the can body 11 and the can body 11 are scheduled to be reduced from the opening end portion 11a of the can body 11. The entire region up to the portion 18 is adhered. In addition, the diameter-reducing mold (punch 35) disposed inside the can body 11 and the portion of the can body 11 that is located closer to the opening end portion 11a than the planned diameter reducing portion 18 are in the radial direction. The gaps are kept close to each other while being suppressed to the above clearance.

つまり、各縮径用金型３５、３６と缶胴１１とを、缶軸Ｏ方向に相対的に接近移動させつつ、該缶胴１１の開口端部１１ａから縮径予定部１８までの領域を、これら金型３５、３６間に嵌合して縮径加工するときに、各縮径用金型３５、３６が缶胴１１に対して内部と外部からそれぞれ密着するように接近配置させられるため、加工される缶胴１１の前記領域の全体が、金型３５、３６間で意図しない向きに移動しにくくなり、しわの発生が顕著に抑制されるのである。   That is, while reducing the diameter reduction molds 35 and 36 and the can body 11 relatively close to each other in the direction of the can axis O, a region from the opening end portion 11a of the can body 11 to the planned diameter reduction portion 18 is formed. When the diameters are reduced by fitting between the molds 35 and 36, the diameter-reducing molds 35 and 36 are disposed close to the can body 11 from the inside and the outside. The entire region of the can body 11 to be processed is difficult to move between the molds 35 and 36 in an unintended direction, and the generation of wrinkles is remarkably suppressed.

このように、縮径用金型３５、３６が、缶胴１１における開口端部１１ａのみならず、該開口端部１１ａからその缶底１２側に位置する縮径予定部１８までの広い領域を、径方向の両側から支持しつつ、缶胴１１にくびれ部１７を成形することができる。
これにより、くびれ部１７を成形する際に、缶胴１１にしわが生じることを顕著に抑制でき、加工精度を安定して高めることができる。 In this way, the diameter-reducing molds 35 and 36 have not only the opening end portion 11a in the can body 11 but also a wide area from the opening end portion 11a to the diameter-reducing planned portion 18 located on the can bottom 12 side. The constricted portion 17 can be formed on the can body 11 while being supported from both sides in the radial direction.
Thereby, when forming the constriction part 17, it can suppress notably that wrinkles arise in the can body 11, and can improve a processing precision stably.

なお、缶胴１１において、缶軸Ｏ方向に沿う少なくとも開口端部１１ａと縮径予定部１８との間の領域を一定の肉厚とするにあたっては、缶胴１１の開口端部１１ａの肉厚を、図８に示される従来のＤＩ缶における缶胴１００の開口端部１００ａの肉厚と同等程度に確保することが好ましい。
つまり本実施形態においては、図６に示されるように、缶胴１１の開口端部１１ａの肉厚を確保すれば、前記領域のうち開口端部１１ａ以外の部位の肉厚についても同様に確保されるため、くびれ部１７成形後の缶胴１１の強度を十分に高めることができる。
このように、本実施形態の特別な構成を採用することにより、ＤＩ缶１０の構造を複雑にすることなく、コラム強度を高めることが可能になる。 In addition, in the can body 11, in order to make at least a region between the opening end portion 11a and the diameter reduction planned portion 18 along the can axis O direction constant thickness, the thickness of the opening end portion 11a of the can body 11 Is preferably secured to the same level as the thickness of the open end 100a of the can body 100 in the conventional DI can shown in FIG.
That is, in this embodiment, as shown in FIG. 6, if the thickness of the opening end 11 a of the can body 11 is ensured, the thickness of the portion other than the opening end 11 a in the region is similarly secured. Therefore, the strength of the can body 11 after forming the constricted portion 17 can be sufficiently increased.
Thus, by adopting the special configuration of the present embodiment, the column strength can be increased without complicating the structure of the DI can 10.

以上より本実施形態によれば、パンチスリーブ３０を用いてＤＩ加工したＤＩ缶１０の缶胴１１に、その後工程においてくびれ部１７を成形するときに、該缶胴１１にしわが発生することを顕著に抑制でき、かつ、ＤＩ加工したＤＩ缶１０のコラム強度を高めることができるのである。   As described above, according to the present embodiment, when the constricted portion 17 is formed in the can body 11 of the DI can 10 DI processed using the punch sleeve 30 in the subsequent process, wrinkles are generated in the can body 11 remarkably. In addition, the column strength of the DI can 10 processed by DI can be increased.

また、本実施形態では、拡径予定部１９及び縮径予定部１８が、缶胴１１のうち缶胴本体１５に配置されており、パンチスリーブ３０の外周面のうち、このパンチスリーブ３０により成形される缶胴１１の缶胴本体１５における、開口端部１１ａに対応する部分と、該開口端部１１ａ以外の部位に対応する部分と、の外径差が、１０μｍ未満であるので、下記の作用効果を奏する。
すなわち上記構成のように、パンチスリーブ３０の外周面のうち、このパンチスリーブ３０により成形される缶胴１１の缶胴本体１５における、開口端部１１ａに対応する部分と、該開口端部１１ａ以外の部位に対応する部分と、の外径差が１０μｍ未満であり、つまりパンチスリーブ３０の外周面のうち、缶胴１１における缶胴本体１５に対応する部位が、パンチスリーブ３０の中心軸方向の全域にわたって一定の外径に形成されていると、このパンチスリーブ３０を用いたＤＩ加工（ＤＩ工程）により、缶胴本体１５を、缶軸Ｏ方向の全域にわたって一定の肉厚で成形することができる。 Further, in the present embodiment, the diameter expansion planned portion 19 and the diameter reduction planned portion 18 are arranged in the can body main body 15 of the can body 11, and the punch sleeve 30 is formed by the punch sleeve 30 on the outer peripheral surface of the punch sleeve 30. Since the difference in outer diameter between the portion corresponding to the opening end portion 11a and the portion corresponding to the portion other than the opening end portion 11a in the can body main body 15 of the can body 11 is less than 10 μm, the following Has an effect.
That is, as in the configuration described above, the portion of the outer peripheral surface of the punch sleeve 30 corresponding to the opening end portion 11a in the can body main body 15 of the can body 11 formed by the punch sleeve 30 and the opening end portion 11a. And the portion corresponding to the can body 11 of the outer surface of the punch sleeve 30 in the direction of the central axis of the punch sleeve 30 is less than 10 μm. If the outer diameter is constant over the entire area, the can body 15 can be formed with a constant thickness over the entire area in the direction of the can axis O by DI processing (DI process) using the punch sleeve 30. it can.

これにより、ＤＩ缶１０における缶胴本体１５のうち開口端部１１ａよりも缶底１２側に位置する拡径予定部１９及び縮径予定部１８を、該缶胴本体１５の所期する位置に種々に配置することができる。
従って、ＤＩ缶１０のデザイン性や持ちやすさ（グリップ性）等の種々の要望に、容易に対応可能である。
また、ＤＩ加工した缶胴１１にくびれ部１７を成形することにより、本実施形態とは異なり例えばインパクト成形加工等でくびれ部１７を成形するような場合に比べて、缶胴１１表面に光沢が出やすくなり、美麗な外観を付与することができるとともに、製品価値を高めることが可能になる。 Thereby, the diameter expansion plan part 19 and the diameter reduction plan part 18 which are located in the can bottom main body 15 side in the DI can 10 in the can bottom 12 side rather than the opening end part 11a are made into the expected position of the can body main body 15. Various arrangements are possible.
Accordingly, it is possible to easily meet various demands such as the design and ease of holding (grip) of the DI can 10.
Further, by forming the constricted portion 17 in the DI-processed can body 11, unlike the present embodiment, for example, the surface of the can body 11 is more glossy than when the constricted portion 17 is formed by impact molding or the like. It becomes easy to come out, can give a beautiful appearance, and can increase the product value.

また、ＤＩ工程に用いるパンチスリーブ３０の前記外径差を、５μｍ以下とすることがより好ましく、この場合、上述の缶胴１１にしわが発生することを抑制できるという効果が、より格別顕著なものとなる。   The outer diameter difference of the punch sleeve 30 used in the DI process is more preferably 5 μm or less. In this case, the effect of suppressing the occurrence of wrinkles in the can body 11 is particularly remarkable. It becomes.

また、本実施形態のＤＩ缶１０の製造方法では、くびれ部成形工程において、縮径予定部１８に複数回の縮径加工を施した後、拡径予定部１９に複数回の拡径加工を施すことにより、図４に示されるＤＩ缶１０の縦断面視で、缶胴１１の内側へ向けて窪む凹曲線状のくびれ部１７を成形するので、缶胴１１のくびれ部１７近傍を美しい外観に形成でき、ＤＩ缶１０のデザイン性やグリップ性等の種々の要望に、容易に対応可能である。   Moreover, in the manufacturing method of the DI can 10 of this embodiment, in the constriction part forming step, after the diameter reduction scheduled part 18 is subjected to diameter reduction processing a plurality of times, the diameter expansion scheduled part 19 is subjected to diameter expansion processing a plurality of times. By forming the concave canal-shaped constricted portion 17 that is recessed toward the inside of the can body 11 in the longitudinal sectional view of the DI can 10 shown in FIG. 4, the vicinity of the constricted portion 17 of the can body 11 is beautiful. It can be formed in appearance, and can easily meet various demands such as the design and grip of the DI can 10.

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、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.

例えば、前述の実施形態では、ＤＩ缶１０の縦断面視において、缶胴１１のくびれ部１７が、該缶胴１１の径方向内側へ向けて窪む凹曲線状をなしているとしたが、これに限定されるものではない。すなわち、くびれ部１７の縦断面形状は、例えば凹曲線、凸曲線、直線の組み合わせによって、種々に設定可能である。   For example, in the above-described embodiment, in the longitudinal cross-sectional view of the DI can 10, the constricted portion 17 of the can body 11 has a concave curve shape that is recessed toward the radially inner side of the can body 11. It is not limited to this. That is, the vertical cross-sectional shape of the constricted portion 17 can be variously set by combining, for example, a concave curve, a convex curve, and a straight line.

また、ＤＩ缶１０の製造方法において、ネッキング工程とフランジング工程との間に、ボトムリフォーム工程を行うこととしてもよい。
この場合、ボトムリフォーム工程では、ＤＩ缶１０の缶底１２に、ボトムリフォーム機構を用いてボトムリフォーム加工を施す。 Moreover, in the manufacturing method of DI can 10, it is good also as performing a bottom reform process between a necking process and a flanging process.
In this case, in the bottom reforming process, the bottom reforming process is performed on the can bottom 12 of the DI can 10 using the bottom reforming mechanism.

また、前述の実施形態では、ＤＩ缶１０が、その開口端部１１ａに缶蓋が巻締められる２ピース缶（缶体）に用いられるとしたが、これに限定されるものではなく、ＤＩ缶１０は、その開口端部１１ａにキャップが螺着されるボトル缶（缶体）に用いられてもよい。   In the above-described embodiment, the DI can 10 is used for a two-piece can (can body) in which a can lid is wound around the opening end portion 11a. However, the present invention is not limited to this. 10 may be used for a bottle can (can body) in which a cap is screwed to the opening end portion 11a.

また、前述の実施形態では、ＤＩ缶１０の製造方法を説明するＤＩ工程において、パンチスリーブ３０の外周面のうち、このパンチスリーブ３０により成形される缶胴１１の缶軸Ｏ方向に沿う少なくとも開口端部１１ａから縮径予定部１８までの領域に対応する範囲における、開口端部１１ａに対応する部分と、該開口端部１１ａ以外の部位に対応する部分と、の外径差が１０μｍ未満であり、かつ、この範囲においてパンチスリーブ３０の外周面が段差なく形成されているとした。詳しくは、パンチスリーブ３０の外周面のうち、このパンチスリーブ３０により成形される缶胴１１の缶胴本体１５における、開口端部１１ａに対応する部分と、該開口端部１１ａ以外の部位に対応する部分と、の外径差が１０μｍ未満であり、パンチスリーブ３０の外周面のうち缶胴本体１５に対応する部位が段差なく形成されているとした。ただし本発明は、前記外径差が１０μｍ未満とされていれば上述の作用効果が得られることから、パンチスリーブ３０の外周面を段差なく形成する場合に限定されるものではない。   In the above-described embodiment, in the DI process for explaining the manufacturing method of the DI can 10, at least the opening along the can axis O direction of the can body 11 formed by the punch sleeve 30 in the outer peripheral surface of the punch sleeve 30. The outer diameter difference between the portion corresponding to the opening end portion 11a and the portion corresponding to the portion other than the opening end portion 11a in the range corresponding to the region from the end portion 11a to the diameter reduction planned portion 18 is less than 10 μm. In addition, it is assumed that the outer peripheral surface of the punch sleeve 30 is formed without a step in this range. Specifically, the outer peripheral surface of the punch sleeve 30 corresponds to a portion corresponding to the opening end portion 11a and a portion other than the opening end portion 11a in the can body main body 15 of the can body 11 formed by the punch sleeve 30. The outer diameter difference between the portion and the portion to be formed is less than 10 μm, and the portion corresponding to the can body 15 of the outer peripheral surface of the punch sleeve 30 is formed without a step. However, the present invention is not limited to the case where the outer peripheral surface of the punch sleeve 30 is formed without a step because the above-described effects can be obtained if the outer diameter difference is less than 10 μm.

すなわち、図６に示されるパンチスリーブ３０の外周面のうち、缶胴１１の缶軸Ｏ方向に沿う少なくとも開口端部１１ａから縮径予定部１８までの領域に対応する範囲における、開口端部１１ａに対応する部分と、該開口端部１１ａ以外の部位に対応する部分と、の外径差が１０μｍ未満とされていれば、この範囲においてパンチスリーブ３０の外周面に段差が形成されていてもよい。例えば、段差が形成されることにより、パンチスリーブ３０の外周面のうち、開口端部１１ａに対応する部分が、該開口端部１１ａ以外の部位に対応する部分よりも大径とされていてもよい。
この場合、パンチスリーブ３０でＤＩ加工される缶胴１１の開口端部１１ａが、該開口端部１１ａ以外の部位よりも薄肉となる。そして、ＤＩ工程より後工程のネッキング工程において、開口端部１１ａは縮径されるので、この縮径加工により開口端部１１ａの肉厚が増大して該開口端部１１ａ以外の部位に近い値となり、剛性は十分に確保される。そして、開口端部１１ａが薄肉化された分だけ、ＤＩ缶１０を軽量化でき、かつ巻締め加工しやすくすることができる。
なお、パンチスリーブ３０の外周面に段差が形成されることにより、開口端部１１ａに対応する部分が、該開口端部１１ａ以外の部位に対応する部分よりも小径とされていてもよい。この場合、このパンチスリーブ３０でＤＩ加工される缶胴１１の開口端部１１ａが、該開口端部１１ａ以外の部位よりも厚肉とされる。
さらに、パンチスリーブ３０の外周面に段差を設ける場合において、段差は１つのみであってもよいし、複数形成されていてもよい。また、段差を設ける代わりに、テーパ面を形成してもよい。 That is, of the outer peripheral surface of the punch sleeve 30 shown in FIG. 6, the opening end portion 11 a in a range corresponding to at least the region from the opening end portion 11 a to the reduced diameter planned portion 18 along the can axis O direction of the can body 11. If the outer diameter difference between the portion corresponding to the portion and the portion corresponding to the portion other than the opening end portion 11a is less than 10 μm, even if a step is formed on the outer peripheral surface of the punch sleeve 30 in this range. Good. For example, even if a step is formed, a portion corresponding to the opening end portion 11a on the outer peripheral surface of the punch sleeve 30 has a larger diameter than a portion corresponding to a portion other than the opening end portion 11a. Good.
In this case, the opening end portion 11a of the can body 11 that is DI-processed by the punch sleeve 30 is thinner than the portion other than the opening end portion 11a. In the necking process, which is a process subsequent to the DI process, the diameter of the opening end 11a is reduced. Therefore, the thickness of the opening end 11a is increased by this diameter reduction processing, and the value close to a portion other than the opening end 11a. Thus, sufficient rigidity is ensured. Then, the DI can 10 can be reduced in weight by the thickness of the opening end portion 11a, and can be easily wound.
Note that, by forming a step on the outer peripheral surface of the punch sleeve 30, a portion corresponding to the opening end portion 11a may have a smaller diameter than a portion corresponding to a portion other than the opening end portion 11a. In this case, the opening end portion 11a of the can body 11 that is DI processed by the punch sleeve 30 is thicker than the portion other than the opening end portion 11a.
Further, when a step is provided on the outer peripheral surface of the punch sleeve 30, only one step or a plurality of steps may be formed. Moreover, you may form a taper surface instead of providing a level | step difference.

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.

[ＤＩ缶の製造確認]
前述の実施形態で説明したＤＩ缶１０の製造方法により、ＤＩ工程においてパンチスリーブ３０を用い、缶胴１１のうち、缶軸Ｏ方向に沿う少なくとも開口端部１１ａから縮径予定部１８までの領域（具体的には缶胴本体１５全体）を、開口端部１１ａと該開口端部１１ａ以外の部位との肉厚差が１５μｍ以下となるように、一定の肉厚で成形したＤＩ缶１０を作製した（実施例１〜８）。すなわち、パンチスリーブ３０として、前述の実施形態で説明したものを用いた。詳しくは、パンチスリーブ３０の外周面のうち、このパンチスリーブ３０により成形される缶胴１１の缶軸Ｏ方向に沿う少なくとも開口端部１１ａから縮径予定部１８までの領域（具体的には缶胴本体１５全体）に対応する範囲における、開口端部１１ａに対応する部分と、該開口端部１１ａ以外の部位に対応する部分と、の外径差が１０μｍ未満とされている、パンチスリーブ３０を用いた。
なお、缶胴本体１５の肉厚ｔについては、開口端部１１ａにおける狙い値：０．１８０ｍｍのもの（実施例１、２、４）と、狙い値：０．２２０ｍｍのもの（実施例５〜７）を作製した。また、実施例３では、缶胴本体１５のうち開口端部１１ａよりも下方の部位（拡径予定部１９及び縮径予定部１８近傍）における肉厚ｔの狙い値を０．１８０ｍｍとした。また、実施例８として、開口端部１１ａにおける肉厚ｔの狙い値：０．１６０ｍｍとし、開口端部１１ａよりも下方の部位における肉厚ｔの狙い値：０．１７０ｍｍとしたものを作製した。つまり実施例８では、開口端部１１ａと該開口端部１１ａ以外の部位との肉厚差を１５μｍ以下に抑えつつも、パンチスリーブ３０の外周面に僅かな段差を意図的に形成するとともにこれを缶胴本体１５に転写させて、開口端部１１ａの肉厚を該開口端部１１ａ以外の部位の肉厚よりも若干薄くしている。 [Production confirmation of DI can]
By the manufacturing method of the DI can 10 described in the above embodiment, the punch sleeve 30 is used in the DI process, and at least the region from the opening end 11a to the planned diameter reduction portion 18 along the can axis O direction in the can body 11 (Specifically, the entire body of the can body 15) is a DI can 10 formed with a constant thickness so that the difference in thickness between the opening end 11a and the portion other than the opening end 11a is 15 μm or less. It produced (Examples 1-8). That is, the punch sleeve 30 described in the above embodiment is used. Specifically, in the outer peripheral surface of the punch sleeve 30, at least the region from the opening end portion 11a to the planned diameter reduction portion 18 along the can axis O direction of the can body 11 formed by the punch sleeve 30 (specifically, the can Punch sleeve 30 in which a difference in outer diameter between a portion corresponding to the opening end portion 11a and a portion corresponding to a portion other than the opening end portion 11a in a range corresponding to the entire body body 15) is less than 10 μm. Was used.
In addition, about the wall thickness t of the can body 15, the target value at the opening end 11a: 0.180 mm (Examples 1, 2, 4) and the target value: 0.220 mm (Examples 5 to 5) 7) was produced. Further, in Example 3, the target value of the wall thickness t in the portion of the can body main body 15 below the opening end portion 11a (in the vicinity of the diameter expansion planned portion 19 and the diameter reduction planned portion 18) was set to 0.180 mm. Further, as Example 8, a target value of the wall thickness t at the opening end portion 11a: 0.160 mm, and a target value of the wall thickness t at a portion below the opening end portion 11a: 0.170 mm were manufactured. . That is, in Example 8, a slight step is intentionally formed on the outer peripheral surface of the punch sleeve 30 while the thickness difference between the opening end portion 11a and the portion other than the opening end portion 11a is suppressed to 15 μm or less. Is transferred to the can body 15 so that the thickness of the opening end 11a is slightly thinner than the thickness of the portion other than the opening end 11a.

これら実施例１〜８のＤＩ缶１０においては、缶胴本体１５のうち、開口端部１１ａにおいて周方向均等に８箇所測定した肉厚ｔの平均値αと、開口端部１１ａよりも下方の部位（拡径予定部１９及び縮径予定部１８近傍）において周方向均等に８箇所測定した肉厚ｔの平均値βとの差（α−β）の絶対値が、１５μｍ以下であった。   In the DI cans 10 of Examples 1 to 8, the average value α of the wall thickness t measured in the circumferential direction in the opening end portion 11a of the can body main body 15 in the circumferential direction, and the lower side than the opening end portion 11a. The absolute value (α−β) of the difference (α−β) from the average value β of the wall thickness t measured at eight locations equally in the circumferential direction at the site (near the diameter expansion planned portion 19 and the diameter reduction planned portion 18) was 15 μm or less.

また、上記ＤＩ工程よりも後工程において、ＤＩ缶１０にくびれ部１７を成形した。
なお、くびれ部成形工程の縮径工程では、パンチ３５とダイス３６の径方向の距離（金型３５、３６間の距離）から缶胴本体１５の肉厚ｔを差し引いたクリアランス（金型３５、３６と缶胴本体１５とのクリアランス）が、缶胴本体１５のうち最も肉厚ｔが大きくなる部分において、１０μｍとなるように設定した。
具体的に、缶胴本体１５において最も肉厚ｔが厚い部分での前記クリアランスを１０μｍに設定すると、缶胴本体１５の缶軸Ｏ方向における肉厚差が上述の最大１５μｍである場合には、実際の前記クリアランスの最大値は、これらの和（１０μｍ＋１５μｍ）より２５μｍとなる。
なお、本発明において、缶胴本体１５のうち肉厚ｔが最も厚い部分に対応して設定される前記クリアランスは、１０μｍ以下であることが好ましく、望ましくは５μｍ以下である。 Further, the constricted portion 17 was formed in the DI can 10 in a later process than the DI process.
In the diameter-reducing step of the constricted portion forming step, a clearance (die 35, subtracting the thickness t of the can body 15 from the radial distance between the punch 35 and the die 36 (distance between the dies 35, 36). The clearance between 36 and the can body 15 is set to 10 μm in the portion of the can body 15 where the wall thickness t is the largest.
Specifically, when the clearance at the thickest part t in the can body 15 is set to 10 μm, when the difference in thickness in the can axis O direction of the can body 15 is 15 μm at the maximum, The actual maximum value of the clearance is 25 μm from the sum (10 μm + 15 μm).
In the present invention, the clearance set corresponding to the thickest portion t of the can body main body 15 is preferably 10 μm or less, and desirably 5 μm or less.

一方、従来の比較例として、ＤＩ工程において従来のパンチスリーブを用い、缶胴１１における缶軸Ｏ方向に沿う開口端部１１ａから縮径予定部１８までの領域のうち、開口端部１１ａの肉厚に対して、開口端部１１ａよりも下方の部位の肉厚を小さく成形したＤＩ缶を作製した（比較例１、２）。つまり比較例１、２では、缶胴本体１５のうち開口端部１１ａの肉厚が、該開口端部１１ａよりも下方の部位の肉厚に比べて大きくされていることで、開口端部１１ａと、開口端部１１ａよりも下方の部位との間に、１５μｍを超える肉厚差が生じており、また段部（段差）が形成されている。
なお、缶胴本体１５の肉厚ｔについては、開口端部１１ａにおける狙い値：０．１８０ｍｍのもの（比較例１）と、狙い値：０．２２０ｍｍのもの（比較例２）を作製した。 On the other hand, as a conventional comparative example, a conventional punch sleeve is used in the DI process, and the meat of the open end 11a in the region from the open end 11a along the can axis O direction to the reduced diameter portion 18 in the can body 11 is shown. A DI can was produced by molding the thickness of the portion below the opening end portion 11a with respect to the thickness (Comparative Examples 1 and 2). That is, in Comparative Examples 1 and 2, the thickness of the opening end portion 11a of the can body main body 15 is made larger than the thickness of the portion below the opening end portion 11a. And a portion below the opening end 11a has a thickness difference of more than 15 μm, and a step (step) is formed.
In addition, about the thickness t of the can body 15, a target value at the opening end 11 a: 0.180 mm (Comparative Example 1) and a target value: 0.220 mm (Comparative Example 2) were produced.

これら比較例１、２のＤＩ缶においては、缶胴本体１５のうち、開口端部１１ａにおいて周方向均等に８箇所測定した肉厚ｔの平均値αと、開口端部１１ａよりも下方の部位（拡径予定部１９及び縮径予定部１８近傍）において周方向均等に８箇所測定した肉厚ｔの平均値βとの差（α−β）の絶対値が、それぞれ２０μｍであった。   In the DI cans of Comparative Examples 1 and 2, in the can body 15, the average value α of the wall thickness t measured at eight locations equally in the circumferential direction at the opening end 11 a and the portion below the opening end 11 a. The absolute values of the difference (α−β) from the average value β of the wall thickness t measured at eight locations in the circumferential direction uniformly in the vicinity of the planned diameter expansion portion 19 and the planned diameter reduction portion 18 were 20 μm, respectively.

また、上記ＤＩ工程よりも後工程において、ＤＩ缶にくびれ部１７を成形した。
なお、くびれ部成形工程の縮径工程では、パンチ３５とダイス３６の径方向の距離（金型３５、３６間の距離）から缶胴本体１５の肉厚ｔを差し引いたクリアランス（金型３５、３６と缶胴本体１５とのクリアランス）が、缶胴本体１５のうち最も肉厚ｔが大きくなる部分において、１０μｍとなるように設定した。 In addition, the constricted portion 17 was formed in a DI can in a later process than the DI process.
In the diameter-reducing step of the constricted portion forming step, a clearance (die 35, subtracting the thickness t of the can body 15 from the radial distance between the punch 35 and the die 36 (distance between the dies 35, 36). The clearance between 36 and the can body 15 is set to 10 μm in the portion of the can body 15 where the wall thickness t is the largest.

そして、ＤＩ工程及びくびれ部成形工程を経た上記実施例１〜８及び比較例１、２の各ＤＩ缶１０の缶胴本体１５を目視により観察して、しわの発生の有無、及びしわの長さ（大きさ）を確認した。
結果を表１に示す。 Then, by visually observing the can body 15 of each DI can 10 of Examples 1 to 8 and Comparative Examples 1 and 2 that have undergone the DI process and the constriction part forming process, the presence or absence of wrinkles and the length of the wrinkles The size (size) was confirmed.
The results are shown in Table 1.

Figure 2016107340
Figure 2016107340

[評価]
本発明の実施例１〜８においては、缶胴本体１５にしわが発生したＤＩ缶１０は殆ど見受けられず、しわが発生したものに関しても、その大きさが３ｍｍ未満であり目立たないため、流通品に採用可能な評価Ａ（優良）、Ｂ（良）となった。その中でも、差（α−β）の絶対値（つまり肉厚差）が、１０μｍ以下である実施例１〜３、５、６、８については、しわの発生が全くなく、格別顕著な効果が得られることが確認された。
一方、比較例１、２においては、上記実施例に比べて缶胴本体１５にしわが発生したＤＩ缶の割合が多く、またしわが発生したものに関しては、その大きさが３ｍｍ以上となって目立っており、流通品に採用不可能な評価Ｃ（不良）となった。 [Evaluation]
In Examples 1 to 8 of the present invention, the DI can 10 in which the wrinkle is generated in the can body 15 is hardly seen, and the size of the DI can 10 that is wrinkled is less than 3 mm and is not noticeable. Evaluation A (excellent) and B (excellent) were applicable. Among them, in Examples 1 to 3, 5, 6, and 8 in which the absolute value (that is, the difference in thickness) of the difference (α−β) is 10 μm or less, wrinkles are not generated at all, and a particularly remarkable effect is obtained. It was confirmed that it was obtained.
On the other hand, in Comparative Examples 1 and 2, the proportion of DI cans with wrinkles in the can body 15 was higher than in the above example, and those with wrinkles were 3 mm or more in size. The evaluation was C (defect) that could not be adopted for distribution products.

１０ ＤＩ缶
１１ 缶胴
１１ａ 開口端部
１２ 缶底
１５ 缶胴本体
１６ 缶胴連結部
１７ くびれ部
１８ 縮径予定部
１９ 拡径予定部
３０ パンチスリーブ
３５ パンチ（縮径用金型）
３６ ダイス（縮径用金型）
４０ パンチ（拡径用金型）
Ｏ 缶軸
Ｗ１ カップ状体
Ｗ２ ＤＩ缶（トリミング加工前） DESCRIPTION OF SYMBOLS 10 DI can 11 Can body 11a Open end 12 Can bottom 15 Can body main body 16 Can body connection part 17 Constriction part 18 Diameter reduction plan part 19 Diameter expansion plan part 30 Punch sleeve 35 Punch (Die for diameter reduction)
36 dies (molds for diameter reduction)
40 punch (expansion mold)
O Can shaft W1 Cup-shaped body W2 DI can (before trimming)

Claims (4)

カップ状体の内部に挿入され、該カップ状体にＤＩ加工を施して、缶胴と缶底を備える有底筒状のＤＩ缶を成形するのに用いられるパンチスリーブであって、
前記缶胴は、
該缶胴の開口端部よりも前記缶底側に位置するとともに、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小径となる縮径加工を施すことが予定される縮径予定部と、
該缶胴の前記開口端部と前記縮径予定部との間に位置するとともに、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大径となる拡径加工を施すことが予定される拡径予定部と、を有し、
当該パンチスリーブの外周面のうち、このパンチスリーブにより成形される前記缶胴の缶軸方向に沿う少なくとも前記開口端部から前記縮径予定部までの領域に対応する範囲における、前記開口端部に対応する部分と、該開口端部以外の部位に対応する部分と、の外径差が、１０μｍ未満であることを特徴とするパンチスリーブ。 A punch sleeve that is inserted into a cup-shaped body, is subjected to DI processing on the cup-shaped body, and is used to form a bottomed cylindrical DI can having a can body and a can bottom,
The can body is
It is positioned to be closer to the bottom of the can than the opening end of the can body, and the reduction is planned to be reduced in diameter along the can axis direction from the bottom to the opening end. A planned diameter part,
A diameter expansion process is performed between the opening end of the can body and the planned diameter reduction portion and having a larger diameter along the can axis direction from the can bottom toward the opening end. A planned diameter expansion portion, and
Out of the outer peripheral surface of the punch sleeve, the opening end portion in a range corresponding to at least a region from the opening end portion to the reduced diameter planned portion along the can axis direction of the can body formed by the punch sleeve. A punch sleeve characterized in that a difference in outer diameter between a corresponding portion and a portion corresponding to a portion other than the opening end is less than 10 μm. 請求項１に記載のパンチスリーブであって、
前記缶胴は、
前記開口端部及び該開口端部の前記缶底側に隣接する部位を有し、前記缶底よりも肉厚が薄くされた缶胴本体と、
前記缶胴本体と前記缶底の間に位置してこれらを連結するとともに、前記缶胴本体から前記缶底側へ向かうに従い漸次肉厚が厚くなる缶胴連結部と、を有し、
前記拡径予定部及び前記縮径予定部は、前記缶胴本体に配置されており、
当該パンチスリーブの外周面のうち、このパンチスリーブにより成形される前記缶胴の前記缶胴本体における、前記開口端部に対応する部分と、該開口端部以外の部位に対応する部分と、の外径差が、１０μｍ未満であることを特徴とするパンチスリーブ。 The punch sleeve according to claim 1,
The can body is
A can body main body having a portion adjacent to the opening bottom and the can bottom side of the opening edge, the wall thickness being thinner than the bottom of the can;
The can body main body and the can bottom are located and connected to each other, and the can body connecting portion gradually increases in thickness as it goes from the can body main body to the can bottom side.
The diameter expansion scheduled part and the diameter reduction planned part are arranged in the can body main body,
Of the outer peripheral surface of the punch sleeve, a portion corresponding to the opening end in the can body main body of the can body formed by the punch sleeve, and a portion corresponding to a portion other than the opening end A punch sleeve having a difference in outer diameter of less than 10 μm. 請求項１又は２に記載のパンチスリーブであって、
前記外径差が、５μｍ以下であることを特徴とするパンチスリーブ。 The punch sleeve according to claim 1 or 2,
The punch sleeve, wherein the outer diameter difference is 5 μm or less. カップ状体にＤＩ加工を施して、缶胴と缶底を備える有底筒状のＤＩ缶とするＤＩ工程と、
前記缶胴の内部及び外部に縮径用金型を嵌合し、該缶胴の開口端部よりも前記缶底側に位置する縮径予定部に、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小径となる縮径加工を施した後、前記缶胴の内部に拡径用金型を嵌合し、該缶胴の前記開口端部と前記縮径予定部との間に位置する拡径予定部に、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大径となる拡径加工を施すことにより、前記缶胴にくびれ部を成形するくびれ部成形工程と、を有するＤＩ缶の製造方法であって、
前記ＤＩ工程では、請求項１〜３のいずれか一項に記載のパンチスリーブを前記カップ状体の内部に挿入し、該カップ状体にＤＩ加工を施すことを特徴とするＤＩ缶の製造方法。 A DI process in which a cup-shaped body is subjected to DI processing to form a bottomed cylindrical DI can having a can body and a bottom,
The diameter reduction mold is fitted inside and outside the can body, and the diameter reduction planned portion located on the can bottom side from the opening end of the can body is moved from the can bottom along the can axis direction. After performing a diameter reduction process that becomes a smaller diameter toward the opening end side, a diameter increasing mold is fitted into the inside of the can body, and the opening end portion of the can body and the diameter reduction scheduled portion The constricted portion is formed in the can body by subjecting the diameter expansion planned portion located between the diameters of the can body to a diameter increasing process from the bottom of the can toward the opening end side along the can axis direction. A method of manufacturing a DI can having a constriction part forming step,
In the said DI process, the punch sleeve as described in any one of Claims 1-3 is inserted in the inside of the said cup-shaped body, DI process is given to this cup-shaped body, The manufacturing method of DI can characterized by the above-mentioned .
JP2015225159A 2014-11-27 2015-11-17 Punch sleeve and method for manufacturing di can using the same Pending JP2016107340A (en)

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JP2014240088 2014-11-27

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