JPH0739617B2 - Aluminum alloy plate for negative pressure can, manufacturing method thereof, and negative pressure can body - Google Patents
Aluminum alloy plate for negative pressure can, manufacturing method thereof, and negative pressure can bodyInfo
- Publication number
- JPH0739617B2 JPH0739617B2 JP16534790A JP16534790A JPH0739617B2 JP H0739617 B2 JPH0739617 B2 JP H0739617B2 JP 16534790 A JP16534790 A JP 16534790A JP 16534790 A JP16534790 A JP 16534790A JP H0739617 B2 JPH0739617 B2 JP H0739617B2
- Authority
- JP
- Japan
- Prior art keywords
- negative pressure
- aluminum alloy
- side wall
- alloy plate
- tensile strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910000838 Al alloy Inorganic materials 0.000 title claims description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 238000000137 annealing Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000005098 hot rolling Methods 0.000 claims description 6
- 238000005097 cold rolling Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 235000014171 carbonated beverage Nutrition 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000010409 ironing Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229910000765 intermetallic Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 2
- 235000015203 fruit juice Nutrition 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910017818 Cu—Mg Inorganic materials 0.000 description 1
- 235000006468 Thea sinensis Nutrition 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 235000020333 oolong tea Nutrition 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000011496 sports drink Nutrition 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、果汁、コーヒー等の悲炭酸飲料物用のDI缶体
に関し、更に詳しくは、熱間充填後に室温まで冷却さ
れ、缶内圧が負圧（1kg/cm2未満）となる悲炭酸飲料用D
I負圧缶体に関するものである。Description: TECHNICAL FIELD The present invention relates to a DI can body for sour carbonated beverages such as fruit juice and coffee, and more specifically, it is cooled to room temperature after hot filling and the internal pressure of the can is reduced. Negative pressure (less than 1 kg / cm 2 ) for sour carbonated drinks D
I Negative pressure can body.
（従来の技術及び解決しようとする課題） 飲料物には、ビール及びコーラ等の炭酸飲料と、果汁及
びコーヒー等の悲炭酸飲料がある。(Prior art and problems to be solved) Beverages include carbonated drinks such as beer and cola, and sour drinks such as fruit juice and coffee.
前者は、炭酸ガスを含有するため、缶側壁の凹みが生ぜ
ず、軽量缶を特長とする缶側壁の薄い２ピースのDI缶
（アルミ、スチール製）が容器として用いられている。Since the former contains carbon dioxide gas, a dent on the side wall of the can does not occur, and a two-piece DI can (aluminum or steel) with a thin side wall, which is a feature of a lightweight can, is used as the container.
一方、後者は、炭酸ガスを含有せず、かつ熱間充填（約
90℃）されるので室温状態では負圧（0.4kg/cm2）とな
るため、容器としては、缶側壁の剛性が高い３ピースの
スチール缶が用いられている。On the other hand, the latter does not contain carbon dioxide and is hot filled (approx.
Since the temperature is 90 ° C., the pressure is negative (0.4 kg / cm 2 ) at room temperature, so a three-piece steel can with a high side wall is used as the container.
容器としては上記の２種類（２ピースのDI缶と３ピース
のスチール缶）があり、DI缶は板から、絞り・しごき
（DI）加工により製造される。また、３ピース缶は板を
溶接或いは接着して製造される。There are two types of containers mentioned above (a 2-piece DI can and a 3-piece steel can), and the DI can is manufactured from a plate by drawing and ironing (DI) processing. A three-piece can is manufactured by welding or adhering plates.
これらの缶は、その加工方法等の相違から缶側壁厚が異
なり、DI缶法では0.11〜0.13mm、３ピース缶法では0.2m
m前後となり、缶重量に大きな差が生じるので、DI加工
法が有利である。These cans have different can side wall thicknesses due to differences in the processing method, etc., 0.11 to 0.13 mm in the DI can method and 0.2 m in the 3-piece can method.
The DI processing method is advantageous because the difference in the can weight is about m.
ところで、近年、窒素封入技術の進展により、悲炭酸飲
料物用においても、容器としてDI缶が用いられ始めてい
る。この技術は、窒素封入により缶内を陽圧（1kg/cm2
以上）とするものであり、缶側壁の凹みを防止すること
ができる。この方法は主としてスポーツ飲料に用いられ
ているが、最近では他の内容物（ウーロン茶）において
も実用化が進められている。By the way, in recent years, due to the progress of nitrogen filling technology, DI cans have begun to be used as containers even for sour carbonated drinks. This technology uses positive pressure (1 kg / cm 2
As described above, it is possible to prevent the side wall of the can from being dented. This method is mainly used for sports drinks, but recently it is being put to practical use for other contents (oolong tea).
しかしながら、この技術（窒素封入）を採用するには設
備面及び技術面において困難な面があり、窒素封入する
ことなくDI缶が採用されることが望まれている。However, it is difficult to adopt this technology (filling with nitrogen) in terms of equipment and technology, and it is desired to use DI cans without filling with nitrogen.
このような状況から、窒素封入技術以外の開発も進めら
れてきた。例えば、缶側壁にビードを付与し、側壁の剛
性を上げる方法であり、特公昭54−14552号、同54−145
53号、特開昭63−125149号などが提案されている。また
最近では、本発明者らの提案（特願平２−150534号）に
よる缶底を内側に変形させる方法がある。Under such circumstances, developments other than nitrogen encapsulation technology have been promoted. For example, a method of increasing the rigidity of the side wall by adding a bead to the side wall of the can is disclosed in Japanese Examined Patent Publication Nos. 54-14552 and 54-145.
No. 53, JP-A No. 63-125149, etc. have been proposed. Further, recently, there is a method of deforming the can bottom inward according to the proposal of the present inventors (Japanese Patent Application No. 2-150534).
一方、材料面では、DI缶用として3004合金の硬質材が多
用されており、この材料の特長はDI加工性に優れること
である。On the other hand, in terms of materials, a hard material of 3004 alloy is often used for DI cans, and the feature of this material is that it is excellent in DI processability.
しかしながら、この材料は硬質材であるため、缶側壁と
缶底部の引張強度は殆ど変わらず（缶側壁部の方が若干
高い:1.1倍）、したがって、負圧缶の場合には肉厚の薄
い側壁部で剛性が弱く、優先的に凹みを生じることとな
っていた。However, since this material is a hard material, the tensile strength of the can side wall and the can bottom is almost the same (slightly higher in the can side wall: 1.1 times). Therefore, in the case of a negative pressure can, the wall thickness is thin. The side wall had low rigidity, and the depression was preferentially formed.
本発明は、上記従来技術の問題点を解決し、特に悲炭酸
飲料用のDI缶に適する材料を提供し、併せてその製造方
法と悲炭酸飲料用DI缶を提供することを目的とするもの
である。An object of the present invention is to solve the above-mentioned problems of the prior art, to provide a material particularly suitable for DI cans for sour carbonated drinks, and at the same time to provide a manufacturing method thereof and DI cans for sour carbonated drinks. Is.
（課題を解決するための手段） 悲炭酸飲料物用へのDI缶採用には、上記３種類の方法
（窒素封入、側壁ビード加工、缶底部の内側への変形）
があるが、窒素封入を不要とする観点では側壁ビード加
工法と缶底部の内側への変形法が理想的である。(Means for Solving the Problem) The above three types of methods can be used to adopt DI cans for sour carbonated drinks (filling with nitrogen, sidewall bead processing, and deformation of the inside of the can bottom).
However, from the viewpoint of eliminating the need for nitrogen filling, the sidewall bead processing method and the method of deforming the inside of the can bottom are ideal.
これらの方法のうち、側壁ビード加工法の場合には塗膜
の欠陥等の問題もあるので、缶底部の内側への変形法の
方が有利である。しかし、従来技術では缶側壁の厚肉化
を回避することは非常に難しいことから、本発明者ら
は、この問題を効果的に解決し得る方策（側壁厚の薄肉
化）について鋭意研究を進めた結果、ここに本発明をな
したものである。Among these methods, the sidewall beading method has a problem such as a defect of the coating film, so that the method of deforming the inside of the bottom of the can is more advantageous. However, since it is very difficult to avoid thickening of the side wall of the can with the conventional technique, the present inventors have conducted earnest research on a method (thinning of the side wall thickness) that can effectively solve this problem. As a result, the present invention is achieved here.
すなわち、本発明（本発明１）は、Mn:0.5〜1.5％及びM
g:0.5〜2.0％を含有し、更にFe:0.2〜0.7％、Si:0.1〜
0.5％、Cu:0.05〜0.5％及びZn:0.1〜1.0％のうちの１種
又は２種以上を含有し、残部が実質的にAlからなるDI缶
用アルミニウム合金板おいて、缶側壁部の引張強度が缶
底部に比較して1.2倍以上高く、缶内が負圧になった時
点で缶底部が優先して変形し得るものであることを特徴
とする負圧缶用アルミニウム合金板を要旨とするもので
ある。That is, the present invention (Invention 1) includes Mn: 0.5 to 1.5% and Mn.
g: 0.5-2.0%, Fe: 0.2-0.7%, Si: 0.1-
0.5%, Cu: 0.05 to 0.5%, and Zn: 0.1 to 1.0%, one or more of them are contained, and the balance of the aluminum alloy plate for a DI can consists essentially of Al. The aluminum alloy plate for negative pressure cans is characterized in that the tensile strength is 1.2 times higher than that of the bottom of the can, and when the inside of the can becomes negative pressure, the bottom of the can can be preferentially deformed. It is what
また、この負圧缶用アルミニウム合金板の製造方法（本
発明２）は、前記化学成分を有するアルミニウム合金鋳
塊に550℃以上の均質化熱処理を施した後、通常の熱間
圧延、冷間圧延及び中間焼鈍を組み合わせて施した板に
対し、引張強度が18〜25Kg/mm2となる焼鈍を施すことに
より、DI缶において缶側壁部の引張強度が缶底部に比較
して1.2倍以上高く、缶内が負圧になった時点で缶底部
が優先して変形し得る材料を得ることを特徴とするもの
である。In addition, this method for producing an aluminum alloy sheet for a negative pressure can (Invention 2) is a method in which an aluminum alloy ingot having the above chemical composition is subjected to homogenizing heat treatment at 550 ° C. or higher, followed by normal hot rolling and cold rolling. By annealing the sheet that has been subjected to a combination of rolling and intermediate annealing to a tensile strength of 18 to 25 kg / mm 2 , the tensile strength of the side wall of the DI can is 1.2 times higher than that of the bottom of the can. It is characterized in that a material that can be deformed preferentially at the bottom of the can is obtained when the pressure in the can becomes negative.
更に、本発明に係るDI負圧缶体（本発明３）は、本発明
２で得られたアルミニウム合金板のDI缶において、缶内
圧が1kg/cm2未満となった時点で缶底部が缶内側に変形
し、缶の内容積が８〜15ml減少することにより缶内圧が
陽圧（1kg/cm2以上）となることを特徴とするものであ
る。Furthermore, the DI negative pressure can body (invention 3) according to the present invention is a DI can of the aluminum alloy plate obtained in the present invention 2, in which the bottom of the can is formed when the internal pressure of the can becomes less than 1 kg / cm 2. It is characterized in that it is deformed inward and the internal volume of the can is reduced by 8 to 15 ml so that the internal pressure of the can becomes positive pressure (1 kg / cm 2 or more).
以下に本発明を更に詳細に説明する。The present invention will be described in more detail below.
（作用） 先ず、本発明における化学成分の限定理由について説明
する。(Operation) First, the reasons for limiting the chemical components in the present invention will be described.
Mn: Mnは強度向上としごき加工性に重要な元素であるが、0.
5％未満ではいずれの効果もなく、また1.5％を超える場
合には強度が高くなりすぎ、また大きな金属間化合物が
生成して成形性を低下させる。したがつて、Mnは0.5％
〜1.5％の範囲とする。Mn: Mn is an important element for improving strength and ironing workability.
If it is less than 5%, there is no effect, and if it exceeds 1.5%, the strength becomes too high, and a large intermetallic compound is formed to deteriorate the formability. Therefore, Mn is 0.5%
The range is to 1.5%.
Mg: Mgは強度向上に重要な元素であると共に、Mnと共存して
絞り耳の安定化に重要な元素である。しかし、0.5％未
満ではいずれの効果もなく、また2.0％を超える場合に
は強度が高くなりすぎて成形性の低下を促す。したがっ
て、Mgは0.5％〜2.0％の範囲とする。Mg: Mg is an important element for improving the strength, and is an important element for coexisting with Mn and stabilizing the ears. However, if it is less than 0.5%, there is no effect, and if it exceeds 2.0%, the strength becomes too high and the moldability is deteriorated. Therefore, the Mg content is in the range of 0.5% to 2.0%.
以上のMn及びMgを主成分とするが、更に以下に示す元素
Fe、Si、Cu及びZnのうちの１種又は２種以上を適量で含
有させる必要がある。The above-mentioned Mn and Mg as the main components, but further the following elements
It is necessary to contain an appropriate amount of one or more of Fe, Si, Cu and Zn.
Fe: FeはMnとの間でAl−Mn−Fe系の化合物を形成し、しごき
加工性の向上に重要な元素である。しかし、0.2％未満
ではこの効果が得られず、また0.7％を超える場合には
大きな金属間化合物が形成して、成形性の低下を促す。
したがって、Feは0.2％〜0.7％の範囲とする。Fe: Fe forms an Al-Mn-Fe-based compound with Mn and is an important element for improving ironing workability. However, if it is less than 0.2%, this effect cannot be obtained, and if it exceeds 0.7%, a large intermetallic compound is formed, which promotes deterioration of formability.
Therefore, Fe is in the range of 0.2% to 0.7%.
Si: SiはFe/Si比の減少による低耳化と上記金属化合物への
相変態（α相の形成）によるしごき加工性の向上に効果
のある元素である。しかし、0.1％未満ではいずれの効
果もなく、また0.5％を超える場合には鋳造時に割れの
問題を招く。したがって、Siは0.1〜0.5％の範囲とす
る。Si: Si is an element effective in lowering the ear by reducing the Fe / Si ratio and improving the ironing workability by the phase transformation into the above-mentioned metal compound (formation of α phase). However, if it is less than 0.1%, there is no effect, and if it exceeds 0.5%, the problem of cracking occurs during casting. Therefore, Si is in the range of 0.1 to 0.5%.
Cu: Cuは強度の向上に効果があり、特に中間焼鈍を高温（43
0℃以上の短時間焼鈍）で行う場合、製缶工程中のベー
キングにおいて、Mgとの間でAl−Cu−Mgの析出硬化を与
える硬化を有する。しかし、0.05％未満ではいずれの効
果も得られず、また0.5％を超える場合には耐食性の低
下を招く。したがって、Cuは0.05％〜0.5％の範囲とす
る。Cu: Cu has the effect of improving the strength, especially during the intermediate annealing at high temperature (43
When it is annealed at 0 ° C. or more for a short time), it has a hardening that gives precipitation hardening of Al—Cu—Mg between Mg and Mg during baking during the can making process. However, if it is less than 0.05%, no effect is obtained, and if it exceeds 0.5%, the corrosion resistance is deteriorated. Therefore, Cu is in the range of 0.05% to 0.5%.
Zn: Znは金属間化合物の微細均一化に効果のある元素である
が、0.1％未満ではその効果が得られず、また1.0％を超
える場合にはその効果が飽和することになるので無駄と
なる。したがって、Znは0.1％〜1.0％の範囲とする。Zn: Zn is an element that has an effect on making the intermetallic compound fine and uniform, but if it is less than 0.1%, its effect cannot be obtained, and if it exceeds 1.0%, the effect is saturated, so it is wasteful. Become. Therefore, Zn is in the range of 0.1% to 1.0%.
次に、アルミニウム合金板の製造方法について説明す
る。Next, a method for manufacturing the aluminum alloy plate will be described.
上記化学成分のアルミニウム合金鋳塊について均質化熱
処理を施す。この熱処理の目的は鋳塊組織の均質化、熱
間圧延性の向上と共に製品板での低耳化にある。しか
し、550℃未満ではいずれの効果も得られないので、均
質化熱処理は550℃以上の温度で行う必要がある。な
お、加熱温度に上限値はないが、アルミニウム合金のバ
ーニング発生温度が一般的には600℃であるので、600℃
限度となる。また、保持時間も特に制限されないが、１
時間以上が望ましい。The aluminum alloy ingot having the above chemical composition is subjected to homogenizing heat treatment. The purpose of this heat treatment is to homogenize the ingot structure, improve the hot rolling property, and reduce the ear in the product sheet. However, since no effect is obtained at a temperature lower than 550 ° C, the homogenizing heat treatment needs to be performed at a temperature of 550 ° C or higher. Although there is no upper limit to the heating temperature, the burning temperature of aluminum alloy is generally 600 ° C, so 600 ° C
It will be the limit. Further, the holding time is not particularly limited, but it is 1
More than time is desirable.
次いで、熱間圧延、冷間圧延及び中間焼鈍を施すが、こ
れらは通常の方法及び条件でよい。具体的には、例え
ば、熱間圧延終了厚を5mm以下、温度を280℃以上とし、
中間焼鈍としては連続焼鈍及びバッチ焼鈍のいずれでも
よい。また冷間圧延については、中間焼鈍の前及び後の
何れか若しくは前後に行い、圧延率の合計を50％以上と
する。Then, hot rolling, cold rolling and intermediate annealing are performed, and these may be performed by a usual method and conditions. Specifically, for example, the hot rolling finish thickness is 5 mm or less, the temperature is 280 ℃ or more,
The intermediate annealing may be either continuous annealing or batch annealing. The cold rolling is performed before or after the intermediate annealing, or before or after the intermediate annealing, and the total rolling rate is 50% or more.
その後、本発明のポイントの一つである仕上焼鈍を施
す。この焼鈍は、缶側壁と缶底部の引張強度に大きな影
響を与えるものである。After that, finish annealing, which is one of the points of the present invention, is performed. This annealing has a great influence on the tensile strength of the side wall and the bottom of the can.
焼鈍条件に関しては、製品板の引張強度が18kg/mm2未満
では負圧缶の耐圧強度である約3kg/cm2（負圧缶は内容
物を充填後レトルト処理として120℃で殺菌処理が施さ
れ、この時の耐圧強度が約3kg/cm2である）を満足せ
ず、また25kg/mm2を超える場合には缶側壁引張強度が缶
底部引張強度の1.2倍以上となるが、缶内が負圧になっ
た時点で缶底部が反転せず、缶側壁の薄肉化が困難であ
る。したがって、仕上焼鈍は上記の強度が得られる条件
で行う。具体的には、例えば、連続焼鈍で行う場合には
到達温度を250〜430℃（但し、加熱冷却速度:100℃/min
以上）の範囲であり、バッチ焼鈍で行う場合には200〜4
00℃の範囲である。上記の強度が得られる限り、DI缶と
した場合、缶側壁部の引張強度が缶底部の引張強度の1.
2倍以上高くなるので、缶内が負圧になった時点で缶底
部が優先的して変形可能である。Regarding the annealing conditions, when the tensile strength of the product sheet is less than 18 kg / mm 2 , it is about 3 kg / cm 2 which is the pressure resistance of the negative pressure can (the negative pressure can is sterilized at 120 ° C as retort treatment after filling the contents. The pressure resistance strength at this time is about 3 kg / cm 2 ) and if it exceeds 25 kg / mm 2 , the can side wall tensile strength will be 1.2 times or more the can bottom tensile strength. When the negative pressure is reached, the bottom of the can does not reverse and it is difficult to reduce the thickness of the side wall of the can. Therefore, the finish annealing is performed under the condition that the above strength can be obtained. Specifically, for example, when performing continuous annealing, the ultimate temperature is 250 to 430 ° C (however, heating / cooling rate: 100 ° C / min.
Above), and 200 to 4 when performing batch annealing.
It is in the range of 00 ° C. As long as the above strength can be obtained, in the case of a DI can, the tensile strength of the can side wall is 1.
Since it is more than twice as high, the bottom of the can is preferentially deformable when the inside of the can becomes negative pressure.
次に、本発明の負圧缶体の条件について説明する。Next, the conditions of the negative pressure can of the present invention will be described.
負圧缶には、前述のとおり、耐圧と負圧の強度が要求さ
れ、耐圧については上述の強度にて満足させることがで
きるが、負圧の場合には特殊な缶底形状が要求される。
すなわち、缶底部が内側に変形し易い形状である。更に
負圧缶として使用される場合には、缶を手に持って凹む
ことがないことが重要である。缶の内容積減少量が8ml
未満ではこれを満足することができず、また15mlを超え
る場合には缶底部の変形が困難となる。As described above, negative pressure cans are required to have pressure resistance and negative pressure strength, and the pressure resistance can be satisfied with the above strength, but in the case of negative pressure, a special can bottom shape is required. .
That is, the bottom of the can is easily deformed inward. Further, when used as a negative pressure can, it is important that the can is not held in the hand and dented. 8 ml reduction in the internal volume of the can
If it is less than 15 ml, this cannot be satisfied, and if it exceeds 15 ml, the deformation of the bottom of the can becomes difficult.
したがって、DI負圧缶体としては、缶内圧が1kg/cm2未
満となった時点で缶底部が缶内側に変形し、缶の内容積
減少量が８〜15mlの範囲とする条件を満足する必要があ
る。これにより、缶内圧が陽圧（1kg/cm2）となり、缶
を手で持っても缶側壁の凹みの優先的発生を防止でき
る。Therefore, as for the DI negative pressure can body, when the can internal pressure is less than 1 kg / cm 2 , the can bottom portion is deformed to the inside of the can and the internal volume reduction amount of the can satisfies the condition of 8 to 15 ml. There is a need. As a result, the internal pressure of the can becomes a positive pressure (1 kg / cm 2 ), and even if the can is held by hand, preferential occurrence of a dent on the can side wall can be prevented.
なお、そのような缶底部形状についての規制は特にな
く、内側に変形し易い形状であればよい。例えば、第１
図に示す缶底部形状は、缶底中央から両端に向かって連
続して凹体に膨出し、缶底両端部近傍にて脚状に突出す
る、いわゆるカルデラ状の形状である。There is no particular restriction on the shape of the bottom of the can, and any shape that can be easily deformed inward may be used. For example, the first
The can bottom shape shown in the figure is a so-called caldera shape in which a can body continuously bulges from the center of the can bottom toward both ends and bulges into a concave shape, and protrudes in a leg shape near both ends of the can bottom.
（実施例） 次に本発明の実施例を示す。(Example) Next, the Example of this invention is shown.
実施例１ 第１表に示す化学成分を有するアルミニウム合金鋳塊に
580℃×３時間の均質化熱処理を施した後、熱間圧延に
て3.0mm厚とし、その後冷間圧延（1.0mm厚）を施して50
0℃×０秒（加熱冷却速度:1000℃/m）の急速加熱冷却を
実施した。Example 1 In an aluminum alloy ingot having the chemical composition shown in Table 1
After homogenizing heat treatment at 580 ℃ for 3 hours, hot-rolling to 3.0mm thickness, then cold-rolling (1.0mm thickness) to 50
Rapid heating / cooling of 0 ° C. × 0 seconds (heating / cooling rate: 1000 ° C./m) was performed.
更に0.35mm厚まで冷間圧延し、300℃で仕上焼鈍を実施
した。Further, it was cold-rolled to a thickness of 0.35 mm, and finish annealing was carried out at 300 ° C.
得られた板材の材料特性、成形性及び缶特性を第２表に
示す。Table 2 shows the material properties, moldability, and can properties of the obtained plate material.
なお、供試缶は、DI加工により66mmφ×72mmh（缶壁最
小肉厚0.13mm）とし、缶底形状は第１図に示すとおりで
ある。また缶底と缶壁の引張強度は小試験片にて実施し
た。The test cans were 66 mmφ x 72 mmh (minimum wall thickness of 0.13 mm) by DI processing, and the can bottom shape is as shown in Fig. 1. The tensile strength of the can bottom and the can wall was measured with a small test piece.
第２表より、本発明例は、所定の耐圧強度（3kg/cm2以
上）を満足すると同時に負圧時の缶底部反転を満足して
いることがわかる。しかし、比較例ではいずれかを満足
しなかった。It can be seen from Table 2 that the examples of the present invention satisfy the predetermined pressure resistance (3 kg / cm 2 or more) and at the same time, can bottom reversal at the time of negative pressure. However, none of the comparative examples satisfied.
実施例２ 実施例１での供試材No.1（第１表）を用いて、缶底部の
反転量（缶の内容積減少量）を第３表の如く変化させ、
反転の難易及び反転後の缶内圧を求めた。 Example 2 Using the sample material No. 1 (Table 1) of Example 1, the reversal amount of the bottom of the can (can inner volume reduction amount) was changed as shown in Table 3,
The difficulty of reversal and the pressure inside the can after reversal were determined.
その結果、第３表に示すように、本発明範囲内のNo.2
は、缶としての要求特性（凹みなし）を満足することが
わかる。比較例No.1は反転が容易であるものの、反転後
の缶内圧が陽圧（1kg/cm2以上）にならず、側壁に凹み
が発生した。As a result, as shown in Table 3, No. 2 within the scope of the present invention
It can be seen that satisfies the required characteristics (deemed concave) as a can. In Comparative Example No. 1, although the inversion was easy, the internal pressure of the can after the inversion did not become a positive pressure (1 kg / cm 2 or more), and the side wall had a dent.
（発明の効果） 以上詳述したように、本発明によれば、悲炭酸飲料用DI
負圧缶体の課題である側壁厚の薄肉化が可能となり、缶
内圧が負圧になっても側壁部の優先的凹みを防止できる
ので、悲炭酸飲料へのアルミ化が促進され、リサイクル
を含めアルミ缶の特長を活かすことができる。 (Effects of the Invention) As described in detail above, according to the present invention, DI
Since it is possible to reduce the thickness of the side wall, which is a problem of the negative pressure can body, and it is possible to prevent preferential denting of the side wall even when the internal pressure of the can becomes negative, promoting the conversion of aluminum into a sad carbonated drink and recycling. Including, you can take advantage of the features of aluminum cans.
第１図は供試缶の缶底部形状の一例を示す断面図であ
る。FIG. 1 is a sectional view showing an example of the shape of the bottom of a test can.
Claims (3)
及びMg:0.5〜2.0％を含有し、更にFe:0.2〜0.7％、Si:
0.1〜0.5％、Cu:0.05〜0.5％及びZn:0.1〜1.0％のうち
の１種又は２種以上を含有し、残部が実質的にAlからな
るDI缶用アルミニウム合金板において、缶側壁部の引張
強度が缶底部に比較して1.2倍以上高く、缶内が負圧に
なった時点で缶底部が優先して変形し得るものであるこ
とを特徴とする負圧缶用アルミニウム合金板。1. Mn: 0.5 to 1.5% by weight (hereinafter the same)
And Mg: 0.5-2.0%, further Fe: 0.2-0.7%, Si:
In the aluminum alloy plate for DI can, which contains one or more of 0.1 to 0.5%, Cu: 0.05 to 0.5%, and Zn: 0.1 to 1.0%, and the balance substantially consists of Al, the side wall of the can The aluminum alloy plate for a negative pressure can has a tensile strength of 1.2 times or more higher than that of the bottom of the can, and when the inside of the can has a negative pressure, the bottom of the can can be preferentially deformed.
ニウム合金鋳塊に550℃以上の均質化熱処理を施した
後、通常の熱間圧延、冷間圧延及び中間焼鈍を組み合わ
せて施した板に対し、引張強度が18〜25Kg/mm2となる焼
鈍を施すことにより、DI缶において缶側壁部の引張強度
が缶底部に比較して1.2倍以上高く、缶内が負圧になっ
た時点で缶底部が優先して変形し得る材料を得ることを
特徴とする負圧缶用アルミニウム合金板の製造方法。2. A plate obtained by subjecting an aluminum alloy ingot having the chemical composition according to claim 1 to a homogenizing heat treatment at 550 ° C. or higher and then performing a combination of ordinary hot rolling, cold rolling and intermediate annealing. On the other hand, when annealing is performed so that the tensile strength is 18 to 25 kg / mm 2 , the tensile strength of the side wall of the DI can is 1.2 times or more higher than that of the bottom of the DI can, and when the inside of the can becomes negative pressure. A method for manufacturing an aluminum alloy plate for a negative pressure can, characterized in that the material whose deformable bottom is preferentially obtained is obtained.
DI缶において、缶内圧が1Kg/cm2未満となった時点で缶
底部が缶内側に変形し、缶の内容積が８〜15ml減少する
ことにより缶内圧が陽圧（1Kg/cm2以上）となることを
特徴とするDI負圧缶体。3. The aluminum alloy plate obtained in claim 2.
For DI cans, when the can internal pressure is less than 1 kg / cm 2 , the can bottom deforms to the inside of the can, and the can internal volume decreases by 8-15 ml, so the can internal pressure is positive (1 kg / cm 2 or more). DI negative pressure can body characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16534790A JPH0739617B2 (en) | 1990-06-22 | 1990-06-22 | Aluminum alloy plate for negative pressure can, manufacturing method thereof, and negative pressure can body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16534790A JPH0739617B2 (en) | 1990-06-22 | 1990-06-22 | Aluminum alloy plate for negative pressure can, manufacturing method thereof, and negative pressure can body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0456743A JPH0456743A (en) | 1992-02-24 |
| JPH0739617B2 true JPH0739617B2 (en) | 1995-05-01 |
Family
ID=15810627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16534790A Expired - Lifetime JPH0739617B2 (en) | 1990-06-22 | 1990-06-22 | Aluminum alloy plate for negative pressure can, manufacturing method thereof, and negative pressure can body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0739617B2 (en) |
-
1990
- 1990-06-22 JP JP16534790A patent/JPH0739617B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0456743A (en) | 1992-02-24 |
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