JP7381184B2

JP7381184B2 - Can processing method

Info

Publication number: JP7381184B2
Application number: JP2017070728A
Authority: JP
Inventors: 政臣田村; 光彦青柳; 清澄眞仁田
Original assignee: Toyo Seikan Kaisha Ltd
Current assignee: Toyo Seikan Kaisha Ltd
Priority date: 2017-03-31
Filing date: 2017-03-31
Publication date: 2023-11-15
Anticipated expiration: 2037-03-31
Also published as: JP2018172135A

Description

本発明は、胴部に凹凸加工部を有する缶体の加工方法に関し、特に、缶体搬送時に、凹凸加工部が搬送ガイドや隣り合う缶体胴部の凹凸加工部に接触しにくい缶体の加工方法に関する。 The present invention relates to a method for processing a can body having an uneven portion on the body, and particularly to a method for processing a can body in which the uneven portion is unlikely to come into contact with a conveyance guide or the uneven portion of an adjacent can body during transportation of the can body. Regarding processing methods .

飲料等を充填した缶体において、顧客吸引力を高めるため、胴部に加飾、ロゴやデザインを凹凸加工されたものが公知である。
凹凸加工には、胴部の外周側に突出するエンボス（浮き出し、凸）加工、内周側に突出するデボス（型押し、凹）加工等があるが、エンボス加工を缶体胴部の最大径部に行った場合、エンボス加工部が缶体における最大外径部となるため、搬送時においてエンボス加工部が他の缶体又はガイド等に接触してしまい、外表面に疵が発生、又は変形するおそれがある。
また、デボス加工を最大径部に行った場合も、デボス加工部が他の缶体又はガイド等に接触した場合、デボス加工された箇所近傍の最大径部外表面に疵が発生、又は変形するおそれがある。
このような問題に対し、特許文献１には、表面に点字を有する缶体であって、胴部に設けられる点字の頂上における径は、点字が設けられている周囲の所定範囲における径以下に設定されている缶体が記載されている。
この構成によれば、隣り合う缶体どうしが擦れ合うように搬送された際にも、点字に対する衝撃が和らげられ、点字の形状を維持できる。
また、特許文献２には、アルミニウム合金板からなる包装容器であって、胴部は、その側壁の肉厚が最も薄くなる位置に、側壁が径方向内側に湾曲する湾曲部を周方向にわたって備える包装容器が記載されている。
この構成によれば、飲料等の充填後の包装容器の流通時における缶同士の側壁接触又は突起物等の側壁接触によって側壁が損傷し、飲料漏れの危険性を回避できる。
また、特許文献３には、金属缶の製造方法、及び前記製造方法により製造された飲料缶が記載されている（特許文献３の図７（Ｂ）参照）。
この製造方法によれば、絞り型及び底絞り型の内周面に、等間隔毎に縦リブあるいは多面形状を施すことにより飲料缶を製造することが可能となる。 BACKGROUND ART Can bodies filled with beverages, etc., are known to have decorations, logos, and designs on the body in order to increase customer attraction.
Concave and convex processing includes embossing (embossed, convex) that protrudes on the outer circumference of the can body, deboss (embossed, concave) that protrudes on the inner circumference, etc. If the embossed part is the largest outside diameter part of the can, the embossed part will come into contact with other cans or guides during transportation, causing scratches or deformation on the outer surface. There is a risk of
In addition, even if deboss processing is performed on the maximum diameter part, if the deboss processing part comes into contact with another can body or guide, etc., scratches may occur or deform on the outer surface of the maximum diameter part near the debossed part. There is a risk.
To address this problem, Patent Document 1 describes a can body having Braille letters on its surface, in which the diameter at the top of the Braille letters provided on the body is less than or equal to the diameter in a predetermined range around the area where the Braille letters are provided. The set can body is listed.
According to this configuration, even when adjacent can bodies are transported so as to rub against each other, the impact on the Braille characters is softened and the shape of the Braille characters can be maintained.
Further, Patent Document 2 discloses a packaging container made of an aluminum alloy plate, in which the body portion is provided with a curved portion in the circumferential direction where the side wall is curved inward in the radial direction at a position where the wall thickness of the side wall is the thinnest. The packaging container is listed.
According to this configuration, it is possible to avoid the risk of beverage leakage due to damage to the side walls due to side wall contact between cans or side wall contact with protrusions, etc., during distribution of the packaging container filled with beverages or the like.
Further, Patent Document 3 describes a method for manufacturing metal cans and a beverage can manufactured by the manufacturing method (see FIG. 7(B) of Patent Document 3).
According to this manufacturing method, it is possible to manufacture a beverage can by forming vertical ribs or multifaceted shapes at regular intervals on the inner peripheral surfaces of the drawing die and the bottom drawing die.

特開２００２－３６２５７３号公報Japanese Patent Application Publication No. 2002-362573 特開２００６－２６４７６９号公報Japanese Patent Application Publication No. 2006-264769 特開２０００－２１８３３３号公報Japanese Patent Application Publication No. 2000-218333

胴部に小径部や凹凸加工部を有する缶体に関して、それぞれ様々な提案がなされているが、胴部の小径部と凹凸加工部の関係性について、更なる改良の余地がある。
特許文献１で公知のものは、胴部の周方向の一部に凹凸加工部を設けることは可能であるが、周方向の広範囲にわたって凹凸加工部を設けることは不可能であった。
特許文献２、３等で公知のものは、胴部の強度を落とすことなく、あるいは、強度を向上させるために変形を加えるものであり、多少の凹凸変形（凹条部、縦リブ、多面形状等）を設けることは言及されているが、胴部に加飾、ロゴやデザインを刻印するために凹凸加工等を施すことは考慮されておらず、周方向の広範囲にわたって加飾性の高い凹凸加工部を設けることは不可能であった。 Although various proposals have been made regarding can bodies having a small diameter portion and a textured portion in the body, there is still room for further improvement in the relationship between the small diameter portion and the textured portion of the body.
In the known device disclosed in Patent Document 1, it is possible to provide an uneven portion in a part of the circumferential direction of the body, but it is impossible to provide an uneven portion over a wide range in the circumferential direction.
The ones known in Patent Documents 2 and 3 are those that add deformation to the body without reducing its strength or to improve its strength. etc.), but it does not take into account the use of irregularities to decorate the body or engrave logos or designs, and it does not take into account the use of irregularities that are highly decorative over a wide area in the circumferential direction. It was impossible to provide a processed section.

本発明は、前述のような課題を解決するものであり、加飾性を高めつつ、搬送時等の接触に起因した損傷や変形のおそれがない凹凸加工部を有する缶体の加工方法を提供することを目的とする。 The present invention solves the above-mentioned problems, and provides a method for processing a can body having a concave-convex portion, which improves decorative properties and eliminates the risk of damage or deformation due to contact during transportation. The purpose is to

本発明に係る缶体加工方法は、底部と胴部を備えた有底筒状の缶体の加工方法であって、前記胴部の一部を縮径して、胴部に最大径部と、前記最大径部より小径で缶軸方向に所定の長さを有する環状小径部とを有するよう加工し、前記環状小径部は、前記胴部の開口側から複数回の縮径加工を行うことで前記環状小径部及び缶体開口側に肩部を設ける際、傾斜部を備える一体の肩部を形成するための複数回の縮径加工のうち１回目から１回以上の縮径加工を肩部所定位置よりも缶軸方向底部側に延長することで形成され、前記環状小径部に凹凸加工を行い、筒面と前記筒面に対し外方又は内方に突出した凹凸加工部を設けることにより、前記課題を解決するものである。 A method for processing a can body according to the present invention is a method for processing a bottomed cylindrical can body having a bottom portion and a body portion, the diameter of a portion of the body portion being reduced to form a maximum diameter portion in the body portion. and an annular small diameter part having a smaller diameter than the maximum diameter part and a predetermined length in the axial direction of the can, and the annular small diameter part is subjected to diameter reduction processing a plurality of times from the opening side of the body. When providing a shoulder on the annular small diameter portion and the can body opening side, one or more diameter reduction processes are performed on the shoulder from the first of multiple diameter reduction processes to form an integral shoulder with an inclined part. The annular small-diameter portion is formed by extending toward the bottom side in the axial direction of the can from a predetermined position, and the annular small-diameter portion is subjected to uneven processing to provide a cylindrical surface and an uneven portion protruding outward or inward with respect to the cylindrical surface. This solves the above problem.

本発明に係る缶体加工方法によれば、缶体の胴部が最大径部より小径の環状小径部を有し、環状小径部は缶軸方向に所定の長さを有する筒面と、筒面に対し外方又は内方に突出した凹凸加工部とを有することにより、缶体に加飾性の高い凹凸加工部を設けつつ、凹凸加工部の外方への最大突出部又は凹部近傍の筒面を最大径部より小径とする缶体を得ることが可能となり、缶体の搬送時等の接触に起因した凹凸加工部の損傷や変形を防止することが可能となる。 According to the can processing method according to the present invention, the body of the can has an annular small diameter part smaller in diameter than the maximum diameter part, and the annular small diameter part has a cylindrical surface having a predetermined length in the can axis direction; By having a concavo-convex part that protrudes outward or inward with respect to the cylindrical surface, the can body is provided with a highly decorative concave-convex part, and the maximum outward protrusion of the concave-convex part or the vicinity of the recess is provided. It becomes possible to obtain a can body in which the cylindrical surface of the can body has a smaller diameter than the maximum diameter part, and it becomes possible to prevent damage and deformation of the uneven part due to contact during transportation of the can body .

本発明の缶体加工方法により成形される第１実施形態に係る缶体の側面図。FIG. 1 is a side view of a can body according to a first embodiment formed by the can body processing method of the present invention. 本発明の缶体加工方法により成形される第１実施形態に係る缶体の寸法関係の説明図An explanatory diagram of the dimensional relationship of the can body according to the first embodiment formed by the can body processing method of the present invention 本発明の缶体加工方法により成形される第１実施形態に係る缶体の肩部加工説明図。FIG. 2 is an explanatory diagram of processing the shoulder of the can body according to the first embodiment, which is formed by the can processing method of the present invention. 参考例である他の缶体加工方法により成形される第１参考形態に係る缶体の側面図。FIG. 3 is a side view of a can body according to a first reference form formed by another can body processing method as a reference example . 参考例である他の缶体加工方法により成形される第２参考形態に係る缶体の側面図。The side view of the can body concerning the 2nd reference form formed by the other can processing method which is a reference example .

本発明の缶体加工方法により成形される第１実施形態に係る缶体１００は、ＴＦＳ（ティンフリースチール）製、ぶりき、アルミニウム合金製、又はその他の金属素材からなり、その表面に塗料やニス、合成樹脂等が塗布、又は被覆された缶体であって、図１に示すように、底部１２０と胴部１１０を備え、底部１２０の対向側には胴部１１０に続く肩部１３０が形成されて開口１４０で開口した有底円筒状に形成されている。
胴部１１０は、底部１２０から開口１４０側に形成された円筒状の最大径部１１１と、最大径部１１１から開口１４０側に形成され、最大径部１１１より小径で缶軸方向に所定の長さを有する円筒面１１４からなる環状小径部１１２とを有し、肩部１３０へと連なっている。最大径部１１１と環状小径部１１２の間は段差部１１５で連接され、最大径部１１１と底部１２０の間は連接傾斜部１２１で連接されている。
環状小径部１１２には、円筒面１１４に凹凸加工部１１３が公知のエンボス加工等により施されている。凹凸加工部１１３は、円筒面１１４の内方に突出した凹加工部、外方に突出した凸加工部、又はこれらの組み合わせからなり、点、線、記号、文字、模様等で形成されるロゴやデザインである。
凹凸加工部１１３が凸加工部の場合、凸加工部の円筒面１１４からの突出高さは、最大径部１１１より缶体１００の外方に突出しない高さに留めている。
なお、胴部１１０の最大径部１１１は同一直径の円筒状に形成されており、環状小径部１１２は、最大径部１１１より小径、かつ、凹凸加工部１１３を除き、同一直径の円筒状に形成されている。 The can body 100 according to the first embodiment formed by the can processing method of the present invention is made of TFS (tin free steel), tin, aluminum alloy, or other metal materials, and has a surface coated with paint or other metal materials. It is a can body coated or coated with varnish, synthetic resin, etc., and as shown in FIG. It is formed into a bottomed cylindrical shape with an opening 140 formed therein.
The body portion 110 includes a cylindrical maximum diameter portion 111 formed from the bottom portion 120 toward the opening 140 side, and a cylindrical maximum diameter portion 111 formed from the maximum diameter portion 111 toward the opening 140 side, which has a smaller diameter than the maximum diameter portion 111 and has a predetermined length in the can axis direction. It has an annular small diameter portion 112 consisting of a cylindrical surface 114 having a radius, and continues to a shoulder portion 130 . The maximum diameter portion 111 and the annular small diameter portion 112 are connected by a stepped portion 115, and the maximum diameter portion 111 and the bottom portion 120 are connected by a connecting slope portion 121.
The annular small-diameter portion 112 has an uneven portion 113 formed on the cylindrical surface 114 by known embossing or the like. The concave-convex portion 113 consists of a concave portion protruding inward from the cylindrical surface 114, a convex portion protruding outward, or a combination thereof, and is a logo formed of points, lines, symbols, letters, patterns, etc. and design.
When the concave-convex portion 113 is a convex portion, the protrusion height of the convex portion from the cylindrical surface 114 is kept at a height that does not protrude outward from the can body 100 beyond the maximum diameter portion 111.
The maximum diameter portion 111 of the body portion 110 is formed into a cylindrical shape with the same diameter, and the annular small diameter portion 112 is formed into a cylindrical shape with a smaller diameter than the maximum diameter portion 111 and with the same diameter except for the uneven portion 113. It is formed.

各部分の寸法関係は、図２に示すように、胴部１１０の缶軸方向長さをＬＤ、環状小径部１１２の缶軸方向長さをＬＳ、凹凸加工部１１３の缶軸方向の加工範囲の長さをＬＥ、段差部１１５の缶軸方向との角度をθｄ、最大径部１１１と環状小径部１１２との段差をδ、凹凸加工部１１３の円筒面１１４に対し外方に突出する凸加工部の加工高さをｈとすると、
１０％≦（ＬＳ／ＬＤ）×１００≦３５％
５０％≦（ＬＥ／ＬＳ）×１００≦８５％
１０°≦θｄ≦３０°
０．１ｍｍ≦ｈ≦２．０ｍｍ、かつ、ｈ＜δ
の範囲に形成される。
なお、図２において、凹凸加工部１１３の凸加工部を側面から見た場合の突出状態を太線で示している。 As shown in FIG. 2, the dimensional relationship of each part is as follows: LD is the length of the body 110 in the can axial direction, LS is the length of the annular small diameter part 112 in the can axial direction, and the machining range of the uneven processing part 113 in the can axial direction. LE is the length of the stepped portion 115, θd is the angle between the stepped portion 115 and the can axis direction, δ is the stepped portion between the maximum diameter portion 111 and the annular small diameter portion 112, and is a convex protruding outward from the cylindrical surface 114 of the uneven portion 113. If the machining height of the machining part is h,
10%≦(LS/LD)×100≦35%
50%≦(LE/LS)×100≦85%
10°≦θd≦30°
0.1mm≦h≦2.0mm, and h<δ
Formed within the range of .
In addition, in FIG. 2, the protruding state of the convex part of the concavo-convex part 113 when viewed from the side is shown by a thick line.

上記により、凹凸加工部１１３を缶体１００の外方又は内方に突出したロゴやデザインとして加飾性を向上させることができるとともに、凹凸加工部１１３の凸加工部（最大突出部）又は凹加工部近傍の円筒面１１４を最大径部１１１より内方とすることが可能であり、搬送時等の接触に起因した凹凸加工部１１３の損傷や変形を防止することが可能となる。
また、環状小径部１１２の缶軸方向の長さが、胴部１１０の缶軸方向長さの１０％以上であることにより、環状小径部１１２に加飾性の高い凹凸加工部１１３を設けることが可能となり、３５％以下であることにより、缶体の強度を低下させることなく、さらに、本実施形態のように１箇所に環状小径部１１２を設ける場合は、内容量を充分に確保することが可能となる。
さらに、凹凸加工部１１３の缶軸方向の加工範囲の長さが、環状小径部１１２の缶軸方向の長さの５０％以上であることにより、加飾性の高い凹凸加工部１１３を設けることが可能となるとともに、８５％以下であることにより、缶体の強度を低下させることがない。
さらに、環状小径部１１２と最大径部１１１との段差部１１５の傾斜が、缶軸に対して１０～３０°であることにより、缶体の強度を低下させることがない。
さらに、凹凸加工部１１３の凸加工部の加工高さｈが、０．１～２．０ｍｍであるため、十分立体的な加飾を施すことができる。凸加工部が最大径部１１１より容器外方側に突出しないので（ｈ＜δ）、搬送時等の接触に起因した凸加工部の損傷や変形を防止することができる。
さらに、凹凸加工部１１３の突出部分の総面積が、環状小径部１１２の総面積の１～５０％とすることで、加飾性の高い凹凸加工部を設けることが可能となるとともに、缶体の強度を低下させることがない。
より具体的な例として、
最大径部１１１の外径φ６６ｍｍ
環状小径部１１２の外径φ６４ｍｍ
ＬＤ＝９５ｍｍ
ＬＳ＝２５ｍｍ
ＬＥ＝１７ｍｍ
θｄ＝２０°
δ＝１．０ｍｍ
ｈ＝０．８ｍｍ
凹凸加工部１１３の突出部分の総面積を、環状小径部１１２の総面積（５０２７ｍｍ^２）の６％（３００ｍｍ^２）に形成した。 As a result of the above, it is possible to improve the decorativeness of the concave and convex portion 113 as a logo or design that protrudes outward or inward of the can body 100, and also to improve the decorativeness of the concave and convex portion 113 as a logo or design that protrudes outward or inward. It is possible to make the cylindrical surface 114 near the processed portion inward from the maximum diameter portion 111, and it is possible to prevent damage or deformation of the uneven processed portion 113 due to contact during transportation or the like.
Further, by making the length of the annular small diameter portion 112 in the can axial direction equal to or more than 10% of the length of the body 110 in the can axial direction, the annular small diameter portion 112 can be provided with a highly decorative uneven portion 113. By being 35% or less, the strength of the can body is not reduced, and when the annular small diameter portion 112 is provided at one location as in this embodiment, a sufficient internal capacity can be ensured. becomes possible.
Furthermore, the length of the machining range of the uneven portion 113 in the can axial direction is 50% or more of the length of the annular small diameter portion 112 in the can axial direction, thereby providing the uneven portion 113 with high decorativeness. Since it is 85% or less, the strength of the can body is not reduced.
Furthermore, since the inclination of the stepped portion 115 between the annular small diameter portion 112 and the maximum diameter portion 111 is 10 to 30° with respect to the can axis, the strength of the can body is not reduced.
Furthermore, since the machining height h of the convex part of the concavo-convex part 113 is 0.1 to 2.0 mm, it is possible to provide a sufficiently three-dimensional decoration. Since the convex portion does not protrude outward from the maximum diameter portion 111 (h<δ), it is possible to prevent the convex portion from being damaged or deformed due to contact during transportation or the like.
Furthermore, by setting the total area of the protruding portions of the uneven portion 113 to 1 to 50% of the total area of the annular small diameter portion 112, it is possible to provide a highly decorative uneven portion, and the can body without reducing the strength of the material.
As a more specific example,
Outer diameter of maximum diameter part 111 φ66mm
The outer diameter of the annular small diameter portion 112 is φ64 mm
LD=95mm
LS=25mm
LE=17mm
θd=20°
δ=1.0mm
h=0.8mm
The total area of the protruding portions of the uneven portion 113 was formed to be 6% (300 mm ² ) of the total area (5027 mm ² ) of the annular small diameter portion 112 .

以上のような第１実施形態に係る缶体１００を製造する缶体加工方法について説明する。
まず、底部１２０、連接傾斜部１２１及び最大径部１１１のみからなる円筒状の胴部を絞り加工等の缶体加工によって形成する。
この工程は、公知の深絞り加工、絞り加工、再絞り加工、絞りしごき加工等の技術を含め、どのような加工方法によってもよい。
次に必要に応じて洗浄，乾燥，印刷，塗装，塗膜焼付等を施した後、縮径加工により、開口１４０側に環状小径部１１２及び肩部１３０を形成する。
縮径加工は、公知の縮径ダイによる加工でもよいし、ロール加工でもよい。
縮径加工として、胴部１１０の開口１４０側から複数回の縮径加工を行うことで、図３の肩部１３０と、その外方の点線で示す傾斜部とを備える一体の肩部を持つ缶体を形成する技術（図３の工程Ａ～Ｄ参照）が公知である。
本実施形態の缶体１００の加工方法では、同様の技術を用い、最初の１回の縮径加工を肩部所定位置より缶軸方向底部側に延長することで（図３のＡ＋工程）、環状小径部１１２と段差部１１５を形成し、その後の３回の縮径加工によって肩部１３０を形成している。
このことで、環状小径部１１２を形成するための別の工具を準備したり、別工程を設ける必要がなく、加工コストや加工時間が節約できる。
そして、環状小径部１１２に凹凸加工を行うことで、円筒面１１４と円筒面１１４に対し外方又は内方、あるいは外方及び内方に突出した凹凸加工部１１３を設ける。
この凹凸加工工程は、公知のエンボス加工等の技術を含め、どのような加工方法によってもよい。
最後に、開口１４０にフランジ加工を行い、図示しない缶蓋を巻き締める前の状態の缶体１００となる。
また、加工コストや加工時間の節約効果は少なくなるが、環状小径部１１２に凹凸加工を行う工程は、環状小径部１１２が形成された後であれば、肩部１３０が形成される前であっても、フランジ加工が行われた後でもよい。 A can processing method for manufacturing the can 100 according to the first embodiment as described above will be described.
First, a cylindrical body section consisting only of the bottom section 120, the connecting inclined section 121, and the maximum diameter section 111 is formed by can processing such as drawing processing.
This step may be performed by any processing method, including known techniques such as deep drawing, drawing, redrawing, drawing and ironing.
Next, after performing cleaning, drying, printing, painting, coating film baking, etc. as necessary, the annular small diameter portion 112 and shoulder portion 130 are formed on the opening 140 side by diameter reduction processing.
The diameter reduction process may be performed using a known diameter reduction die or may be performed by roll processing.
By performing the diameter reduction process multiple times from the opening 140 side of the body part 110, an integral shoulder part including the shoulder part 130 in FIG. Techniques for forming can bodies (see steps A to D in FIG. 3) are known.
In the method of processing the can body 100 of this embodiment, the same technique is used, and by extending the first diameter reduction process from the predetermined position of the shoulder toward the bottom side in the axial direction of the can (Step A+ in FIG. 3), An annular small diameter portion 112 and a stepped portion 115 are formed, and a shoulder portion 130 is formed by three subsequent diameter reduction processes.
This eliminates the need to prepare a separate tool or provide a separate process for forming the annular small diameter portion 112, and can save processing costs and processing time.
Then, by performing unevenness processing on the annular small diameter portion 112, the cylindrical surface 114 and the unevenness processed portion 113 protruding outwardly or inwardly, or outwardly and inwardly with respect to the cylindrical surface 114 are provided.
This unevenness processing step may be performed using any processing method, including known techniques such as embossing.
Finally, the opening 140 is flange-processed to obtain the can body 100 in a state before the can lid (not shown) is rolled up.
Furthermore , although the saving effect on machining cost and machining time will be reduced, the step of machining irregularities on the annular small diameter portion 112 can be carried out after the annular small diameter portion 112 is formed, but before the shoulder portion 130 is formed. However, it may be done after the flange processing is performed.

以下、参考例である他の加工方法により成形される第１参考形態、第２参考形態に係る缶体について、第１実施形態と同じ内容は適宜割愛する。
第１参考形態に係る缶体１００ｂは、図４に示すように、底部１２０と胴部１１０を備え、底部１２０の対向側には胴部１１０に続く肩部１３０が形成されて開口１４０で開口した有底円筒状に形成されている。
胴部１１０は、肩部１３０に連なる最大径部１１１と、最大径部１１１から底部１２０にかけて形成された最大径部１１１より小径で缶軸方向に所定の長さを有する円筒面１１４からなる環状小径部１１２とを有し、最大径部１１１と環状小径部１１２の間は段差部１１５で連接され、環状小径部１１２と底部１２０の間は連接傾斜部１２１で連接されている。
環状小径部１１２にも、第１実施形態同様、円筒面１１４に凹凸加工部１１３が施されている。 Hereinafter, regarding the can bodies according to the first reference embodiment and the second reference embodiment molded by other processing methods as reference examples , the same content as the first embodiment will be omitted as appropriate.
As shown in FIG. 4, the can body 100b according to the first reference embodiment includes a bottom portion 120 and a body portion 110, and a shoulder portion 130 that continues to the body portion 110 is formed on the opposite side of the bottom portion 120, and is opened at an opening 140. It is formed into a cylindrical shape with a bottom.
The body 110 has an annular shape including a maximum diameter part 111 connected to the shoulder part 130 and a cylindrical surface 114 formed from the maximum diameter part 111 to the bottom part 120 and having a smaller diameter than the maximum diameter part 111 and a predetermined length in the can axis direction. The maximum diameter portion 111 and the annular small diameter portion 112 are connected by a stepped portion 115, and the annular small diameter portion 112 and the bottom portion 120 are connected by a connecting slope portion 121.
Similarly to the first embodiment, the annular small diameter portion 112 also has an uneven portion 113 formed on the cylindrical surface 114.

以上のような第１参考形態に係る缶体１００ｂを製造する缶体加工方法について説明する。
まず、第１実施形態同様、底部１２０、連接傾斜部１２１及び最大径部１１１のみからなる円筒状の胴部を絞り加工等の缶体加工によって形成する。
次に、連接傾斜部１２１に連接する環状小径部１１２を再絞り加工や縮径加工によって形成する。
この工程も、公知の再絞り加工，縮径加工等の技術を含め、どのような加工方法によってもよい。再絞り加工の際は、最大径部１１１を残すよう、部分的に再絞り加工を行って環状小径部１１２、段差部１１５を形成する。（必要に応じて底部１２０、連接傾斜部１２１もリフォームする。） A can processing method for manufacturing the can 100b according to the first reference embodiment as described above will be described.
First, as in the first embodiment, a cylindrical body section consisting only of the bottom section 120, the connecting inclined section 121, and the maximum diameter section 111 is formed by can processing such as drawing processing.
Next, the annular small diameter portion 112 connected to the connecting inclined portion 121 is formed by redrawing or diameter reduction.
This step may also be performed by any processing method, including known techniques such as re-drawing and diameter reduction processing. During the re-drawing process, the annular small-diameter part 112 and the step part 115 are formed by partially re-drawing so that the maximum diameter part 111 remains. (The bottom part 120 and the connecting slope part 121 are also renovated as necessary.)

次に、縮径加工により、開口１４０側に肩部１３０を形成する。
この工程も、第１実施形態と同様、公知の縮径加工等の技術を含め、どのような加工方法によってもよい。
そして、環状小径部１１２に凹凸加工を行うことで、円筒面１１４と円筒面１１４に対し外方又は内方に突出した凹凸加工部１１３を設ける。
この凹凸加工工程も第１実施形態同様、公知のエンボス加工等の技術を含め、どのような加工方法によってもよい。
最後に、開口１４０にフランジ加工を行い、図示しない缶蓋を巻き締める前の状態の缶体１００ｂとなる。
なお、環状小径部１１２に凹凸加工を行う工程は、環状小径部１１２が形成された後であれば、肩部１３０が形成される前であっても、フランジ加工後であってもよい。 Next, the shoulder portion 130 is formed on the opening 140 side by diameter reduction processing.
Similar to the first embodiment, this step may be performed using any processing method, including known techniques such as diameter reduction processing.
Then, by performing unevenness processing on the annular small diameter portion 112, a cylindrical surface 114 and an unevenness processed portion 113 protruding outward or inward from the cylindrical surface 114 are provided.
Similar to the first embodiment, this unevenness processing step may be performed using any processing method including known techniques such as embossing.
Finally, the opening 140 is flange-processed to obtain the can body 100b in a state before the can lid (not shown) is rolled up.
Note that the step of performing unevenness processing on the annular small diameter portion 112 may be performed after the annular small diameter portion 112 is formed, before the shoulder portion 130 is formed, or after the flange processing.

第２参考形態に係る缶体１００ｃは、図５に示すように、底部１２０から開口１４０側に形成された円筒状の下方の最大径部１１１と、下方の最大径部１１１から開口１４０側に形成され、最大径部１１１より小径で缶軸方向に所定の長さを有する円筒面１１４からなる環状小径部１１２と、環状小径部１１２からさらに開口１４０側に形成され、下方の最大径部１１１と同径の上方の最大径部１１１とを有し、肩部１３０へと連なっている。
上方及び下方の最大径部１１１と環状小径部１１２の間はそれぞれ段差部１１５で連接され、下方の最大径部１１１と底部１２０の間は連接傾斜部１２１で連接されている。
環状小径部１１２にも、第１実施形態同様、円筒面１１４に凹凸加工部１１３が施されている。 As shown in FIG. 5, the can body 100c according to the second reference embodiment has a cylindrical lower maximum diameter part 111 formed from the bottom part 120 to the opening 140 side, and a cylindrical lower maximum diameter part 111 formed from the lower maximum diameter part 111 to the opening 140 side. an annular small diameter part 112 formed of a cylindrical surface 114 having a smaller diameter than the maximum diameter part 111 and a predetermined length in the axial direction of the can; and an upper maximum diameter portion 111 of the same diameter, and are continuous to the shoulder portion 130.
The upper and lower maximum diameter portions 111 and the annular small diameter portion 112 are connected by step portions 115, and the lower maximum diameter portion 111 and the bottom portion 120 are connected by a connecting slope portion 121.
Similarly to the first embodiment, the annular small diameter portion 112 also has an uneven portion 113 formed on the cylindrical surface 114.

以上のような第２参考形態に係る缶体１００ｃを製造する缶体加工方法について説明する。
まず、第１実施形態同様、底部１２０、連接傾斜部１２１及び最大径部１１１のみからなる円筒状の胴部を絞り加工等の缶体加工によって形成する。
次に、最大径部１１１の缶軸方向中間部に、環状小径部１１２をロール加工による縮径加工によって形成する。 A can processing method for manufacturing the can 100c according to the second reference embodiment as described above will be described.
First, as in the first embodiment, a cylindrical body section consisting only of the bottom section 120, the connecting inclined section 121, and the maximum diameter section 111 is formed by can processing such as drawing processing.
Next, an annular small diameter portion 112 is formed at the middle portion of the maximum diameter portion 111 in the can axial direction by diameter reduction processing using roll processing.

次に、ネッキング加工により、開口１４０側に肩部１３０を形成する。
そして、環状小径部１１２に凹凸加工を行い凹凸加工部１１３を設ける。
最後に、開口１４０にフランジ加工を行う。
なお、環状小径部１１２に凹凸加工を行う工程は、環状小径部１１２が形成された後であれば、いずれの段階で行ってもよい。 Next, a shoulder portion 130 is formed on the opening 140 side by necking processing.
Then, the annular small diameter portion 112 is subjected to uneven processing to provide an uneven processed portion 113.
Finally, the opening 140 is flanged.
Note that the step of performing unevenness processing on the annular small diameter portion 112 may be performed at any stage after the annular small diameter portion 112 is formed.

以上、本発明の缶体加工方法により成形される好適な実施形態について説明したが、本発明の缶体加工方法により成形される缶体は上記の実施形態により限定されるものではない。
例えば、環状小径部１１２は、第１実施形態に、第１参考形態や第２参考形態を組み合わせて、２箇所以上設けてもよい。環状小径部１１２を２箇所以上設けた場合、凹凸加工部１１３は、少なくとも１つの環状小径部１１２に設ければよい。
さらにまた、缶体１００として、口部にねじ式キャップを螺合可能なボトル缶に適用してもよい。
また、缶体の筒面は、実施形態では円筒面であるが、角型等の他の外形でもよく、缶体の底部は、実施形態では胴部と一体に形成されているが、胴部と別体のものであってもよい。
さらに、缶体の胴部は、平板の端部を溶接して筒型としたものであってもよい。 Although the preferred embodiments molded by the can processing method of the present invention have been described above, the can bodies molded by the can processing method of the present invention are not limited to the above embodiments.
For example, the annular small diameter portion 112 may be provided at two or more locations by combining the first embodiment, the first reference embodiment, and the second reference embodiment . When two or more annular small diameter portions 112 are provided, the uneven portion 113 may be provided in at least one annular small diameter portion 112 .
Furthermore , the can body 100 may be applied to a bottle can to which a screw-type cap can be screwed onto the mouth part.
Further, although the cylindrical surface of the can body is a cylindrical surface in the embodiment, it may have other external shapes such as a square shape, and the bottom of the can body is formed integrally with the body in the embodiment, but the body has a cylindrical surface. It may be a separate entity.
Further, the body of the can may be formed into a cylinder shape by welding the ends of a flat plate.

１００・・・缶体
１１０・・・胴部
１１１・・・最大径部
１１２・・・環状小径部
１１３・・・凹凸加工部
１１４・・・円筒面（筒面）
１１５・・・段差部
１２０・・・底部
１２１・・・連接傾斜部
１３０・・・肩部
１４０・・・開口
100 ... Can body 110 ... Body part 111 ... Maximum diameter part 112 ... Annular small diameter part 113 ... Concave-convex processed part 114 ... Cylindrical surface (cylindrical surface)
115... Step part 120... Bottom part 121... Connecting slope part 130... Shoulder part 140... Opening

Claims

A method for processing a bottomed cylindrical can body having a bottom and a body,
The diameter of a part of the body is reduced so that the body has a maximum diameter part and an annular small diameter part made of a cylindrical surface having a smaller diameter than the maximum diameter part and a predetermined length in the axial direction of the can. ,
When providing a shoulder on the annular small diameter portion and the can opening side by performing diameter reduction processing multiple times from the opening side of the body, the annular small diameter portion forms an integral shoulder portion with an inclined portion. It is formed by extending the first to one or more diameter reduction processes from the first to the bottom side in the axial direction of the can from the predetermined position of the shoulder,
A method for processing a can body, characterized in that the annular small-diameter portion is subjected to uneven processing, and an uneven processed portion is provided that protrudes outward or inward with respect to the cylindrical surface.

The uneven processing includes protrusion processing that causes the cylindrical surface to protrude outward, and the processing height of the protrusion processing from the cylindrical surface is 0.1 to 2.0 mm, and The can body processing method according to claim 1, characterized in that the can body does not protrude.