JP7363870B2 - Method of manufacturing metal containers - Google Patents

Method of manufacturing metal containers Download PDF

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JP7363870B2
JP7363870B2 JP2021146097A JP2021146097A JP7363870B2 JP 7363870 B2 JP7363870 B2 JP 7363870B2 JP 2021146097 A JP2021146097 A JP 2021146097A JP 2021146097 A JP2021146097 A JP 2021146097A JP 7363870 B2 JP7363870 B2 JP 7363870B2
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mouth
curled
curved
manufacturing
crushing
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JP2021185100A (en
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俊幸 長谷川
政臣 田村
友彦 中村
武志 藍原
健 村瀬
尚也 松本
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Toyo Seikan Kaisha Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Description

本発明は、金属製の容器の製造方法に関するものである。
なお、実施例では缶体及び缶体口部のカール部形成方法も開示する。 The present invention relates to a method of manufacturing a metal container .
In addition, in the examples, a method for forming a curled portion of a can body and a can mouth portion is also disclosed.

口部を有する缶体は、飲料水などの液体収容物の容器として一般に用いられており、キャップで密封される口部には、開口端をカール状に巻き加工したカール部が形成されている。特に、ボトル缶は、アルミニウム製やその合金製の金属板を絞り加工及びしごき加工によって有底筒状体に形成した後、この有底筒状体の開口部に、ネックイン加工を施すことで縮径した口部を形成し、その口部にねじ成形加工とカール成形加工を施している。 A can body with a mouth part is generally used as a container for liquids such as drinking water, and the mouth part sealed with a cap has a curled part formed by curling the open end. . In particular, bottle cans are made by forming a metal plate made of aluminum or its alloy into a bottomed cylindrical body by drawing and ironing, and then applying neck-in processing to the opening of this bottomed cylindrical body. A mouth with a reduced diameter is formed, and the mouth is threaded and curled.

このような缶体の口部に形成されるカール部は、口部に被着されるキャップのシール材との密封性などを考慮して、各種の加工形状が提案されている。 Various processed shapes have been proposed for the curled portion formed at the mouth of the can body , taking into consideration the sealing performance with the sealing material of the cap attached to the mouth.

例えば、下記特許文献１に記載された従来技術は、開口部の周縁を径方向外側に折り返して形成されるカール部が、ボトル缶の缶軸方向と略平行な方向に延在した外面側壁部と、外面側壁部の上端から径方向内方に向かう外面側凸曲部と、外面側凸曲部からさらに径方向内方に向かう内面側凸曲部を備え、外面側壁部を所定長さ以上にすると共に、潰し加工によって直線状に成形される外面側壁部と外面側凸曲部との接続部を、ボトル缶の上端（口部の上端）から離間させた形状にしたものが示されている。 For example, in the prior art described in Patent Document 1 below, a curled portion formed by folding back the peripheral edge of an opening radially outward extends in an outer side wall of a bottle can in a direction substantially parallel to the can axis direction. and an outer convex curved portion extending radially inward from the upper end of the outer side wall portion, and an inner convex curved portion extending radially inward from the outer convex curved portion, and extending the outer side wall portion to a predetermined length or more. In addition, a shape is shown in which the connecting part between the outer side wall part formed into a straight line by crushing and the outer convex curved part is spaced from the upper end of the bottle can (upper end of the mouth part). There is.

また、下記特許文献２に記載された従来技術は、外巻きのカール部を、カール潰し加工を施すことなく、その外側面が外方に突出する曲面となるようにし、カール部の縦断面形状が縦長の長円形となるように形成したものが示されている。 Further, in the conventional technology described in Patent Document 2 below, the outer side of the curled portion is made to have a curved surface that protrudes outward without performing curl crushing, and the vertical cross-sectional shape of the curled portion is It is shown that it is formed into a vertically elongated oval shape.

特開２００４－２１７３０５号公報Japanese Patent Application Publication No. 2004-217305 特開２００６－１８８２７９号公報Japanese Patent Application Publication No. 2006-188279

前述した特許文献１に記載の従来技術は、湾曲状のフランジ加工（スピニング成形）と直線的な潰し加工の組み合わせによってカール部を形成している。この際、直線的な潰し加工によって形成される外面側壁部の下端は自由端になっており、ボトル缶の口部（口金部）の外周面との間に比較的大きな間隙が形成されている。このような従来技術によると、缶体に収容物を充填した後キャップによって口部を密封した状態で、落下衝撃が加わった場合に、外面側壁部の下端と口部外周面との間隙に応じてカール部が変形することになり、この変形でシールポイントにおいて所望の密封性が得られなくなる問題が生じることがある。 In the prior art described in Patent Document 1 mentioned above, a curled portion is formed by a combination of curved flange processing (spinning molding) and linear crushing processing. At this time, the lower end of the outer side wall formed by the linear crushing process is a free end, and a relatively large gap is formed between it and the outer peripheral surface of the mouth (mouthpiece) of the bottle can. . According to such conventional technology, when a drop impact is applied with the can body filled with contents and the mouth sealed with a cap, a drop occurs depending on the gap between the lower end of the outer side wall and the outer peripheral surface of the mouth. This deforms the curled portion, and this deformation may cause a problem in that desired sealing performance cannot be obtained at the sealing point.

これに対して、前述した特許文献２に記載の従来技術は、潰し加工を行うこと無く全体的に湾曲したカール部を形成しており、カール部の下端を口部の外周面に近接させている。しかしながら、横断面形状が縦長の長円形であるカール部は、その形状が落下衝撃に対して耐性のある形状になっていないので、缶体に収容物を充填した後キャップによって口部を密封した状態で、落下衝撃が加わった場合には、カール部の断面形状が潰れるように変形して、この変形により所望の密封性能が得られなく問題が生じることがある。 On the other hand, the conventional technology described in Patent Document 2 described above forms a curled portion that is curved as a whole without performing crushing, and the lower end of the curled portion is brought close to the outer circumferential surface of the mouth portion. There is. However, the shape of the curled part, which has a vertically long oval cross-sectional shape, is not resistant to drop impact, so after filling the can body with contents, the mouth part is sealed with a cap. If a drop impact is applied in this state, the cross-sectional shape of the curled portion is deformed so as to be crushed, and this deformation may cause a problem in that the desired sealing performance cannot be obtained.

本発明は、このような従来技術の問題点を解消することを課題とするものであり、キャップ被着に対して所望の密封性能を得ることができるカール部の形状であって、しかも、落下衝撃に対するカール部の変形を抑止すること、が本発明の課題である。 It is an object of the present invention to solve the problems of the prior art. It is an object of the present invention to suppress deformation of the curled portion due to impact.

このような課題を解決するために、本発明による容器の製造方法は、以下の構成を具備するものである。
底部と胴部と口部を有する金属製の容器の、前記口部の開口端にカール部を形成する容器の製造方法であって、前記カール部の最大外径部より下方の部位を潰し加工によって湾曲成形するステップを含み、前記潰し加工は、スピニングダイで支持しながらリフォームツールを側方から押し当てることで口部をカール部形成した金属製の容器の製造方法。 In order to solve such problems, the method for manufacturing a container according to the present invention has the following configuration.
A method for manufacturing a metal container having a bottom, a body, and a mouth, the container forming a curl at the opening end of the mouth, the method comprising crushing a portion of the curl below the maximum outer diameter. The method for manufacturing a metal container includes the step of forming a metal container into a curve by pressing a reforming tool from the side while supporting it with a spinning die to form a curled opening.

このような特徴を有する本発明の缶体は、カール部の断面形状が落下衝撃に対する耐性を有する形状になっている。これによって、口部に被着するキャップに対して所望の密封性能を得ることができるカール部の形状であって、しかも落下衝撃に対するカール部の変形を抑止することができる。
また、本発明のカール部形成方法により、缶体カール部の最大外径部より下方の部位を、落下衝撃に対する耐性を有する形状、あるいは、口部に被着するキャップに対して所望の密封性能を得ることができる形状に成形できる。 In the can body of the present invention having such characteristics, the cross-sectional shape of the curled portion has a shape that is resistant to drop impact. As a result, the shape of the curled portion is such that the desired sealing performance can be obtained with respect to the cap that is attached to the mouth portion, and furthermore, the deformation of the curled portion due to a drop impact can be suppressed.
Furthermore, by using the method of forming the curled portion of the present invention, the portion below the maximum outer diameter of the curled portion of the can body can be shaped into a shape that is resistant to drop impact, or has the desired sealing performance for the cap that is attached to the mouth. It can be molded into a shape that allows you to obtain

缶体の構成例を示した説明図である（全体構成図）。FIG. 2 is an explanatory diagram showing an example of the configuration of a can body (overall configuration diagram). 本発明の実施形態に係る缶体のカール部を示した縦断面図である。FIG. 2 is a longitudinal sectional view showing a curled portion of a can body according to an embodiment of the present invention. 本発明の実施形態に係る缶体のカール部とキャップの密封性を示した縦断面図である。FIG. 3 is a longitudinal cross-sectional view showing the sealing properties of the curled portion of the can body and the cap according to the embodiment of the present invention. 本発明の実施形態に係る缶体の口部におけるカール部形成方法を示した説明図である（（ａ）が加工前の状態、（ｂ）スピニング成形の成形途中、（ｃ）がスピニング成形の成形後、（ｄ）が潰し加工の成形工程をそれぞれ示している。）。FIG. 2 is an explanatory diagram showing a method for forming a curled portion at the mouth of a can body according to an embodiment of the present invention ((a) is a state before processing, (b) is in the process of spinning forming, and (c) is a state during spinning forming. After molding, (d) shows the molding process of crushing.)

以下、図面を参照して本発明の実施形態を説明する。以下の説明で、異なる図における同一符号は同一機能の部位を示しており、各図における重複説明は適宜省略する。 Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same reference numerals in different figures indicate parts with the same function, and redundant explanation in each figure will be omitted as appropriate.

図１は、缶体１の構成例を示している。缶体１は、例えば、底部１Ａ、胴部１Ｂ、肩部１Ｃ、口部１Ｄを有する金属製の容器である。缶体１の一例はボトル缶である。
ボトル缶の形成方法は以下の通りである。例えば、アルミ合金などからなる金属板を円形状に打ち抜き、それを絞り加工して有底円筒状のカップ部材を得て、それを再絞り・しごき加工して、所定肉厚の円筒状の缶を一旦得る。その後、ネックイン加工によって、円筒状の缶の開口端から所定長さを縮径して肩部１Ｃおよび口部を形成する。そして口部に、ビード部及びネジ部をスピニング加工によって形成し、次いで、ネジ部の上方に、上向き内側に傾斜した側壁（後述の側壁２）をネックイン加工によって形成し、そして、前記側壁の上方の開口端には以下に説明するカール部１０をスピニング加工により形成することで口部１Ｄを有するボトル形状の缶体１を得る。 FIG. 1 shows an example of the structure of the can body 1. As shown in FIG. The can body 1 is, for example, a metal container having a bottom portion 1A, a body portion 1B, a shoulder portion 1C, and a mouth portion 1D. An example of the can body 1 is a bottle can.
The method for forming the bottle can is as follows. For example, a metal plate made of aluminum alloy or the like is punched into a circular shape, then drawn to obtain a cylindrical cup member with a bottom, which is then drawn and ironed again to form a cylindrical can with a predetermined wall thickness. Once obtained. Thereafter, neck-in processing is performed to reduce the diameter of the cylindrical can by a predetermined length from the open end to form a shoulder portion 1C and a mouth portion. Then, a bead portion and a threaded portion are formed in the mouth portion by spinning processing, and then a side wall (side wall 2 to be described later) that slopes upwardly and inwardly is formed above the threaded portion by neck-in processing, and the side wall of the side wall is By forming a curled portion 10, which will be described below, at the upper open end by spinning, a bottle-shaped can body 1 having a mouth portion 1D is obtained.

カール部１０は、口部１Ｄの開口端を外側に湾曲させてカール状に加工した部位である。カール部１０は、口部１Ｄの周囲に略同一断面で環状に形成されている。 The curled portion 10 is a portion formed by curving the opening end of the mouth portion 1D outward into a curled shape. The curl portion 10 is formed in an annular shape around the mouth portion 1D with substantially the same cross section.

本発明の実施形態に係る缶体１の口部１Ｄに設けたカール部１０は、図２に示すような断面形状を有している（図において、Ｐ１は缶軸に平行な仮想線である）。すなわち、カール部１０は、口部１Ｄの上端を含む上端湾曲部１１と、下端１２Ａが口部１Ｄの側壁２に近接又は当接して上方が缶軸（仮想線Ｐ１）に対して外側に傾斜した外壁湾曲部１２とを有しており、その断面形状が、口部１Ｄの側壁２と上端湾曲部１１と外壁湾曲部１２を三辺とする略逆三角形状になっている。 The curled portion 10 provided at the mouth 1D of the can body 1 according to the embodiment of the present invention has a cross-sectional shape as shown in FIG. 2 (in the figure, P1 is an imaginary line parallel to the can axis). ). That is, the curled portion 10 has an upper end curved portion 11 including the upper end of the mouth portion 1D, and a lower end 12A that is close to or in contact with the side wall 2 of the mouth portion 1D, so that the upper portion is inclined outward with respect to the can axis (imaginary line P1). Its cross-sectional shape is approximately an inverted triangle with three sides being the side wall 2 of the mouth portion 1D, the upper end curved portion 11, and the outer wall curved portion 12.

このようなカール部１０の断面形状は、構造的に落下衝撃に対する耐性を有する形状になっている。具体的な構造を示すと、上端湾曲部１１の内側には内側連結湾曲部１３が設けられ、上端湾曲部１１に外側には外側連結湾曲部１４が設けられており、内側連結湾曲部１３の曲率半径Ｒ２と外側連結湾曲部１４の曲率半径Ｒ３は、いずれも上端湾曲部１１の曲率半径Ｒ１より小さく形成されて、略逆三角形状の角部を形成している。 The cross-sectional shape of the curled portion 10 is structurally resistant to drop impact. To show a specific structure, an inner connecting curved part 13 is provided on the inside of the upper end curved part 11, an outer connecting curved part 14 is provided on the outer side of the upper end curved part 11, and the inner connecting curved part 13 is The radius of curvature R2 and the radius of curvature R3 of the outer connecting curved portion 14 are both smaller than the radius of curvature R1 of the upper end curved portion 11, forming a substantially inverted triangular corner.

また、更に具体的には、カール部１０は、外壁湾曲部１２の下端１２Ａより上側の口部１Ｄの側壁２が、缶軸（仮想線Ｐ１）に対して上方が内側に傾斜している。このように口部１Ｄの側壁２を傾斜させることで、この傾斜で図示Ｆ方向の偏荷重を受けることができるので、このような断面形状のカール部１０は、偏荷重に対しても高い耐性を有している。 More specifically, in the curled portion 10, the side wall 2 of the mouth portion 1D above the lower end 12A of the outer wall curved portion 12 is inclined inward from above with respect to the can axis (imaginary line P1). By slanting the side wall 2 of the mouth portion 1D in this manner, it is possible to receive an unbalanced load in the direction F in the drawing due to this inclination, so that the curled portion 10 having such a cross-sectional shape has a high resistance to the unbalanced load. have.

また、更に具体的には、カール部１０は、上端湾曲部１１と外壁湾曲部１２の曲率半径が略同等に形成されることが好ましい。これによると、カール部１０の断面形状による略逆三角形状が略正三角形になり、各種方向から受ける衝撃荷重に対して等しい耐性を有することになる。この際には、外側連結湾曲部１４がカール部１０における最大外径部１４Ａになる。 More specifically, it is preferable that the curled portion 10 is formed such that the radius of curvature of the upper end curved portion 11 and the outer wall curved portion 12 are approximately the same. According to this, the substantially inverted triangular cross-sectional shape of the curled portion 10 becomes a substantially equilateral triangle, and has equal resistance to impact loads received from various directions. At this time, the outer connecting curved portion 14 becomes the maximum outer diameter portion 14A of the curled portion 10.

図３は、缶体１の口部１Ｄにキャップ３を被着した場合におけるカール部１０の密封構造の一例を示している。前述した断面形状を有するカール部１０は、キャップ３を口部１Ｄに被着した場合に、外側連結湾曲部１４がキャップ３のシール材（ライナー材）３Ａに食い込むことでシールポイントを形成することができ、良好な密封性を得ることができる。この際、外側連結湾曲部１４の曲率半径Ｒ３を上端湾曲部１１の曲率半径Ｒ１より小さくして、適正な範囲で設定することにより、シール材３Ａの破損を防ぎながら所望の食い込みが得られるカール部１０の形状にすることができる。 FIG. 3 shows an example of a sealing structure of the curled portion 10 when the cap 3 is attached to the mouth portion 1D of the can body 1. The curled portion 10 having the above-described cross-sectional shape forms a seal point when the outer connecting curved portion 14 bites into the sealing material (liner material) 3A of the cap 3 when the cap 3 is attached to the mouth portion 1D. It is possible to obtain good sealing performance. At this time, by making the radius of curvature R3 of the outer connecting curved part 14 smaller than the radius of curvature R1 of the upper end curved part 11 and setting it within an appropriate range, a desired curl can be obtained while preventing damage to the sealing material 3A. 10 can be formed.

また、缶体１が陽圧状態の場合には、キャップ３に口部１Ｄの上端から離れようとする力が常に作用することになるが、カール部１０の断面形状によると、シールポイントとなる外側連結湾曲部１４から下方に延びる外壁湾曲部１２が、内側に向けて傾斜しているので、シール材３Ａに食い込んだ外側連結湾曲部１４から下側の部分が陽圧によるキャップ３の浮き上がりを止める係止作用を有することになり、缶体が陽圧状態の場合にも効果的な密封効果を得ることができる。 Furthermore, when the can body 1 is under positive pressure, a force that tends to separate the cap 3 from the upper end of the mouth portion 1D always acts on the cap 3, but according to the cross-sectional shape of the curled portion 10, a sealing point is formed. Since the outer wall curved portion 12 extending downward from the outer connecting curved portion 14 is inclined inward, the portion below the outer connecting curved portion 14 that bites into the sealing material 3A prevents the cap 3 from lifting due to positive pressure. This has a locking action, and an effective sealing effect can be obtained even when the can body is under positive pressure.

図４は、カール部１０の形成方法の一例を示している。（ａ）は、加工前の開口端１Ｄ１を示している。この開口端１Ｄ１に対して、第１段階の加工として、（ｂ），（ｃ）に示すようなスピニング成形を行う。具体的には、（ｂ）に示すように、上方から第１のスピニングダイ２０を押圧させることで、開口端１Ｄ１に湾曲状のフランジ成形（スピニング成形）を行う。この際、第１のスピニングダイ２０の湾曲型２０Ａによって、カール部１０における上端湾曲部１１の湾曲形状（曲率半径Ｒ１）が成形される。次に、（ｃ）に示すように、第２のスピニングダイ２１を押圧させることで、上端湾曲部１１の内側に形成される内側連結湾曲部１３を成形する。この際、第２のスピニングダイ２１の湾曲型２１Ａによって、内側連結湾曲部１３の湾曲形状（曲率半径Ｒ２）が成形される。 FIG. 4 shows an example of a method for forming the curled portion 10. (a) shows the open end 1D1 before processing. This opening end 1D1 is subjected to spinning forming as shown in (b) and (c) as a first stage processing. Specifically, as shown in (b), by pressing the first spinning die 20 from above, a curved flange forming (spinning forming) is performed on the open end 1D1. At this time, the curved shape (radius of curvature R1) of the upper end curved part 11 in the curled part 10 is formed by the curved die 20A of the first spinning die 20. Next, as shown in (c), by pressing the second spinning die 21, the inner connecting curved portion 13 formed inside the upper end curved portion 11 is formed. At this time, the curved shape (radius of curvature R2) of the inner connecting curved portion 13 is formed by the curved die 21A of the second spinning die 21.

その後、第２段階の加工として、（ｄ）に示すように、リフォームツール２２を側方から押し当てて、潰し加工する。この潰し加工で、カール部１０の最大外径部より下方の部位である外壁湾曲部１２を湾曲成形する。この際、リフォームツール２２は、回転中心軸に対して上方が外側に傾斜して湾曲した型面２２Ａを有しているので、これによって成形される外壁湾曲部１２は、その一部が潰し加工により、リフォームツール２２の回転中心軸、および、缶軸（仮想線Ｐ１）に対し下方が内側に傾斜した湾曲成形面を有している。 Thereafter, as a second stage of processing, as shown in (d), the reforming tool 22 is pressed from the side to perform crushing processing. By this crushing process, the outer wall curved portion 12, which is a portion below the maximum outer diameter portion of the curled portion 10, is formed into a curve. At this time, since the remodeling tool 22 has a mold surface 22A that is curved with the upper part inclined outward with respect to the rotation center axis, a part of the outer wall curved part 12 formed by this is crushed. Therefore, it has a curved molding surface whose lower part is inclined inward with respect to the rotation center axis of the reforming tool 22 and the can axis (imaginary line P1).

このように、スピニング成形と潰し加工の組み合わせでカール部１０を成形すること自体は、従来技術で示すように既に知られているが、本発明の形成方法では、潰し加工にて用いられるリフォームツール２２の型面２２Ａが回転中心軸に対して上方が外側に傾斜した湾曲面であることが１つの特徴になっている。このようなリフォームツール２２を用いることで、カール部１０の断面形状を、落下衝撃に対して耐性を有する効果的な略逆三角形状にすることができる。 As described above, forming the curled portion 10 by a combination of spinning and crushing is already known as shown in the prior art, but in the forming method of the present invention, the reform tool used in the crushing One feature is that the mold surface 22A of No. 22 is a curved surface whose upper side is inclined outward with respect to the rotation center axis. By using such a reform tool 22, the cross-sectional shape of the curled portion 10 can be made into a substantially inverted triangular shape that is effective and resistant to drop impact.

以上、本発明の実施の形態について図面を参照して詳述してきたが、具体的な構成はこれらの実施の形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計の変更等があっても本発明に含まれる。また、上述の各実施の形態は、その目的及び構成等に特に矛盾や問題がない限り、互いの技術を流用して組み合わせることが可能である。 Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design may be changed without departing from the gist of the present invention. Even if there is, it is included in the present invention. Moreover, the above-described embodiments can be combined by using each other's technologies unless there is a particular contradiction or problem in the purpose, structure, etc.

１：缶体，１Ａ：底部，１Ｂ：胴部，１Ｃ：肩部，１Ｄ：口部，
２：側壁，３：キャップ，３Ａ：シール材，
１０：カール部，１１：上端湾曲部，１２：外壁湾曲部，１２Ａ：下端，
１３：内側連結湾曲部，１４：外側連結湾曲部
1: Can body, 1A: Bottom, 1B: Body, 1C: Shoulder, 1D: Mouth,
2: side wall, 3: cap, 3A: sealing material,
10: Curled portion, 11: Upper end curved portion, 12: Outer wall curved portion, 12A: Lower end,
13: Inner connecting curved part, 14: Outer connecting curved part

Claims (5)

底部と胴部と口部を有する金属製の容器の、前記口部の開口端にカール部を形成する容器の製造方法であって、
前記カール部の最大外径部より下方の部位を潰し加工によって湾曲成形するステップを含み、
前記潰し加工は、スピニングダイで支持しながらリフォームツールを側方から押し当てることで口部をカール部形成した金属製の容器の製造方法。
A method for manufacturing a metal container having a bottom, a body, and a mouth, in which a curl is formed at the open end of the mouth, the method comprising:
a step of forming a curve by crushing a portion below the maximum outer diameter portion of the curled portion;
The crushing process is a method of manufacturing a metal container in which the opening is formed into a curled part by pressing a reforming tool from the side while supporting it with a spinning die.
 前記潰し加工によって湾曲成形された成形面が容器軸に対して下方が内側に傾斜して成形されることを特徴とする請求項１に記載された金属製の容器の製造方法。
2. The method of manufacturing a metal container according to claim 1, wherein the molding surface formed into a curve by the crushing process is formed so that the lower part thereof is inclined inward with respect to the container axis.
 第１段階の加工として前記口部の開口端にスピニングダイによる湾曲フランジ成形を行い、その後の第２段階として前記潰し加工を行うことを特徴とする請求項１又は２に記載された金属製の容器の製造方法。
 3. The metal according to claim 1, wherein the opening end of the mouth part is formed into a curved flange using a spinning die as a first step, and the crushing step is performed as a subsequent second step. Method of manufacturing containers.
 前記リフォームツールは、容器軸に対し下方が内側に傾斜した湾曲成形面を有している請求項１～３のいずれか１項に記載された金属製の容器の製造方法。
The method for manufacturing a metal container according to any one of claims 1 to 3, wherein the reforming tool has a curved molding surface whose lower side is inclined inward with respect to the container axis.
 請求項１～４に記載のいずれか１項に記載の前記金属製の容器は、缶体である、缶体の製造方法。
A method for producing a can body, wherein the metal container according to any one of claims 1 to 4 is a can body.
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