JP3582224B2 - Bulge can manufacturing method - Google Patents
Bulge can manufacturing method Download PDFInfo
- Publication number
- JP3582224B2 JP3582224B2 JP09366696A JP9366696A JP3582224B2 JP 3582224 B2 JP3582224 B2 JP 3582224B2 JP 09366696 A JP09366696 A JP 09366696A JP 9366696 A JP9366696 A JP 9366696A JP 3582224 B2 JP3582224 B2 JP 3582224B2
- Authority
- JP
- Japan
- Prior art keywords
- bulge
- raw
- pressure
- thin film
- elastic member
- 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 - Fee Related
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- Rigid Containers With Two Or More Constituent Elements (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
【0001】
【発明の属する技術分野】
この発明はバルジ缶の製造方法に関するものである。
【0002】
ビール、炭酸飲料、果汁飲料、コーヒー飲料等を充填する金属缶は、胴部が軸方向全体が同一径を有する円筒状の金属缶の他に、外観デザイン上の要請から、図1に示すような胴部2に膨出部3を形成したバルジ缶1が使用される。
【0003】
【従来の技術】
バルジ缶1を製造する方法としては、図4に示すように、アルミ板、ブリキ板あるいはティンフリースチール板からなるブランクを、絞り−しごき成形、絞り−再絞り成形、絞り−薄肉化再絞り成形、絞り−薄肉化再絞り−しごき成形等に付して素缶4に成形し、次いで前記素缶4をリフター10によってダイ5のキャビティー6内にセットし(図4a)、次いで前記素缶4の円筒形状の胴部2内に弾性ポンチ12を挿入した後、前記弾性ポンチ12にバルジ加工圧力Pを加えてバルジ成形を行い、前記キャビティー6の形状に対応する形状を前記素缶4の胴部2に成形することが一般に行われている。
【0004】
【発明が解決しようとする課題】
しかしながらバルジ成形においては、素缶4の胴部2がバルジ成形時の径方向の伸びが良好でないと前記胴部2がバルジ成形時に破胴し、希望する外観形状が得られない。
【0005】
素缶4の胴部2の径に対するバルジ缶1の胴部2の径方向の膨出率は、薄錫メッキ鋼板からなる溶接缶では14%であるが、3000系のアルミからなる絞り−しごき缶(アニーリング無し)では2%、ティンフリースチール板からなる絞り−薄肉化再絞り成形缶では1%程度ある。
【0006】
このように、特に前記した絞り−しごき成形缶あるいは絞り−薄肉化再絞り成形缶等の缶胴側面に縦目(サイドシーム)を有しない2ピース缶(シームレス缶)は、素缶4の胴部2が前記成形によって加工硬化し、前記胴部2の径方向の伸び率(膨出率)が低下し、バルジ成形時に破胴を生じ易く、成形が困難となる。
【0007】
このような径方向の伸び率が低下した絞り−しごき缶に対して、バルジ成形時に図4に示す様に、素缶4の上端部に軸方向力Fを加えることが知られているが、前記軸方向力Fは、素缶4の座屈強度以下に制限されてしまう。
【0008】
本発明は上記事情に鑑みてなされたものであって、素缶に、素缶の座屈強度以上の軸方向力をバルジ加工の際に加えることを可能とし、これによって素缶の胴部の径方向のバルジ加工性を飛躍的に向上させ、胴部に破胴を生じることなく容易に製造可能で、しかも優れたデザインのバルジ缶を得るための製造方法を提供することを目的とするものである。
【0009】
【課題を解決するための手段】
この目的に対応して本発明のバルジ缶の製造方法は、素缶から胴部に膨出部を有するバルジ缶を製造する方法において、素缶の胴部の膨出部以外の外面がダイに密着した状態に前記素缶をダイのキャビティー内に挿入し、前記素缶内に前記素缶の内径よりも小さな外径の薄膜弾性部材または弾性ポンチを挿入し、前記薄膜弾性部材または弾性ポンチによってバルジ加工圧力よりも小さい初期圧力を前記素缶に作用させかつ前記素缶に前記薄膜弾性部材または弾性ポンチを密着させた状態で前記素缶の上端を押圧する押圧リングによって前記素缶の座屈強度よりも大きい軸方向力を加えた後、前記軸方向力を加えた状態で前記薄膜弾性部材または弾性ポンチによってバルジ加工圧力を加えて胴部に膨出部を形成することを特徴としている。
【0010】
【実施例】
以下、本発明の製造方法について図面に基づいて説明する。
【0011】
図1はバルジ缶1の縦断面図で、胴部2にバルジ加工によって希望する外観形状の膨出部3が形成されている。
【0012】
図2は本発明のバルジ缶の製造方法の第1実施例で、ダイ5は図示しないが二つの割型で、バルジ缶1の膨出部3の形状に対応した内面形状のキャビティー6を有する。
【0013】
図中7は押圧リングで、ダイ5と同様二つの割型で、ダイ5にロッド8を介して取り付けられており、バルジ成形直前及びバルジ成形中に素缶4の上端部を押圧する。
【0014】
また図中9は厚さ2mm程度のゴム等の薄膜弾性部材で、適宜手段で水等の流体を供給し、流体圧力によって膨張させるが、膨張前は素缶4の内径及び押圧リング7の内径よりも小さい外径を有する。
【0015】
また図中10はリフターで、素缶4をダイ5に挿入する際あるいは取り出す際に、前記素缶4をリフター10上に固定するバキューム孔11を有する。
【0016】
図2(a)に示す様に、絞り−しごき成形によって形成された素缶4をリフター10のバキューム孔11の真空保持によって、ダイ5のキャビティー6内に供給した後、素缶4内に薄膜弾性部材9を挿入する。
【0017】
次に図2(b)に示す様に、薄膜弾性部材9を流体圧力によって膨張させ、素缶4の内面に前記薄膜弾性部材9を密着させて初期圧力P1を加える。またこの時、素缶4の胴部は図2に示すように、膨出部3以外の外面をダイに密着している。
【0018】
この初期圧力P1を加えた状態で、図2(c)に示す様に押圧リング7を下降させ、素缶4の上端部に前記素缶4の座屈強度よりも大きい下向きの軸方向力F1を加える。この時、図2に示すように、素缶4の胴部は図2に示すように、膨出部3以外の外面はダイに密着している。
【0019】
この軸方向力F1を加えた状態で、図2(d)に示す様に、素缶4に前記初期圧力P1よりも大きいバルジ加工圧力P2を加えて、前記素缶4の胴部2に膨出部3を形成しバルジ缶1を製造する。
【0020】
そして図示しないが、押圧リング7を上方に移動して軸方向力F1を除去し、その後バルジ加工圧P2を除去し、薄膜弾性部材9を収縮してバルジ缶1内から取り出し、ダイ5を開いてキャビティー6内からリフター10のバキューム孔11の真空保持によって前記バルジ缶1を取り出す。
【0021】
図3は本発明のバルジ缶の製造方法の第2実施例で、前記した第1実施例と同様に、バルジ缶1の膨出部3の形状に対応した内面形状のダイキャビティー6を設けたダイ5と素缶4の上端部を押圧する押圧リング7、素缶4を前記ダイキャビティー6内に供給するリフター10を有する。
【0022】
また図中12はウレタン系ゴム等の弾性ポンチで、適宜手段で軸方向に圧縮して径方向に膨出させるが、膨出前は素缶4の内径及び押圧リング7の内径よりも小さい外径を有する。
【0023】
バルジ成形に際しては図3(a)に示す様に、絞り−しごき成形によって成形された素缶4をリフター10のバキューム孔11の真空保持によってダイ5のキャビティー6内に供給した後、前記素缶4内に弾性ポンチ12を挿入する。
【0024】
次に、弾性ポンチ12を軸方向圧力を加えて径方向に膨出させ、前記素缶4の内面に前記弾性ポンチ12を密着させて初期圧力P1を加える。
【0025】
この初期圧力P1を加えた状態で図3(b)に示す様に、前記素缶4の座屈強度よりも大きい下向きの軸方向力F1を押圧リング7によって素缶4の上端部に加える。
【0026】
この軸方向力F1を加えた状態で図3(c)に示す様に、素缶4に前記初期圧力P1よりも大きいバルジ加工圧力P2を加えて、素缶4の胴部2に膨出部3を形成しバルジ缶1を製造する。
【0027】
そして図示しないが、押圧リング7を上方に移動して軸方向力F1を除去し、その後バルジ加工圧P2を除去し、弾性ポンチ12を収縮してバルジ缶1内から取り出し、ダイ5を開いてキャビティー6内からリフター10のバキューム孔11の真空保持によって前記バルジ缶1を取り出す。
【0028】
なお本発明において、素缶4は前記した実施例に限定されることなく、絞り−再絞り成形缶、絞り−薄肉化再絞り成形缶、絞り−薄肉化再絞り−しごき成形缶等の缶胴側面に縦目(サイドシーム)を有しない2ピース缶(シームレス缶)、あるいは、溶接缶等の缶胴側面に継目を有するピース缶のいずれも用いることができる。
【0029】
また本発明において、素缶4の上端部に加える軸方向力F1の方向は前記した実施例に限定されることなく、押圧リング7を固定した状態で素缶4をリフター10によって下方から押し上げて、前記素缶4の上端部を押圧リング7に当接させても良い。
【0030】
また本発明においては、前記軸方向力F1を加える時期は前記実施例に限定されず、初期圧力P1とほぼ同時に加えても良いが、耐座屈性の点から前記初期圧力P1を先行して加えるのが望ましい。
【0031】
【発明の効果】
以上の説明から明らかな様に、本発明のバルジ加工缶の製造方法によれば、バルジ加工前に素缶のバルジ加工圧力よりも小さい初期圧力を加えることによってバルジ加工時に前記素缶に座屈強度以上の軸方向力を加えることができ、素缶の胴部の径方向のバルジ加工性を飛躍的に向上させ、胴部に破胴を生じることなく容易に製造可能となり、しかも優れたデザインのバルジ缶を得ることができる。
【図面の簡単な説明】
【図1】バルジ缶を示す縦断面説明図。
【図2】本発明の製造方法の第1実施例を示す説明図。
【図3】本発明の製造方法の第2実施例を示す説明図。
【図4】従来のバルジ缶の製造方法を示す説明図。
【符号の説明】
1 バルジ缶
2 胴部
3 膨出部
4 素缶
5 ダイ
6 キャビティー
7 押圧リング
8 ロッド
9 薄膜弾性部材
10 リフター
11 バキューム孔
12 弾性ポンチ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a bulge can.
[0002]
Metal cans for filling beer, carbonated drinks, fruit drinks, coffee drinks, etc. are shown in FIG. A bulge can 1 having a bulging
[0003]
[Prior art]
As a method of manufacturing the bulge can 1, as shown in FIG. 4, a blank made of an aluminum plate, a tin plate or a tin-free steel plate is drawn-ironed, drawn-redrawn, drawn-thinned and redrawn. , Drawing, thinning, redrawing, ironing, etc. to form the raw can 4, and then setting the raw can 4 in the
[0004]
[Problems to be solved by the invention]
However, in the bulge forming, if the
[0005]
The radial expansion ratio of the
[0006]
As described above, in particular, the two-piece can (seamless can) having no side eyes (side seam) on the side of the can body, such as the above-described drawn-ironed can or drawn-thinned re-drawn can, is used as the body of the raw can 4. The
[0007]
It is known that an axial force F is applied to the upper end portion of the raw can 4 as shown in FIG. 4 at the time of bulge forming on the drawn-ironed can having the reduced radial elongation, The axial force F is limited to the buckling strength of the raw can 4 or less.
[0008]
The present invention has been made in view of the above circumstances, and makes it possible to apply an axial force greater than the buckling strength of the raw can to the raw can at the time of bulging, thereby enabling the body of the raw can to be It is an object of the present invention to provide a manufacturing method for obtaining a bulge can of a superior design, which can dramatically improve radial bulge workability, can be easily manufactured without a broken body in the body, and has an excellent design. It is.
[0009]
[Means for Solving the Problems]
Method for producing a bulge can of the present invention in correspondence with this purpose, a method of producing a bulge can having a bulge portion in the body portion from Motokan, the die outer surface of the non-bulged portion of the body portion of Motokan The elemental can is inserted into the cavity of the die in a state of being in close contact, a thin film elastic member or an elastic punch having an outer diameter smaller than the inner diameter of the elemental can is inserted into the elemental can, and the thin film elastic member or the elastic punch is inserted. The initial pressure lower than the bulging pressure is applied to the raw can, and the thin-film elastic member or the elastic punch is brought into close contact with the raw can. After applying an axial force greater than the flexural strength, a bulging pressure is applied by the thin film elastic member or the elastic punch in a state where the axial force is applied to form a bulging portion on the body. .
[0010]
【Example】
Hereinafter, the manufacturing method of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a longitudinal sectional view of a bulge can 1, in which a
[0012]
FIG. 2 shows a first embodiment of a method for manufacturing a bulge can according to the present invention. The die 5 is a split mold (not shown) and has a
[0013]
In the drawing,
[0014]
In the figure, reference numeral 9 denotes a thin film elastic member made of rubber or the like having a thickness of about 2 mm, which is supplied with a fluid such as water by an appropriate means and is expanded by the fluid pressure. It has a smaller outer diameter.
[0015]
In the figure,
[0016]
As shown in FIG. 2A, the raw can 4 formed by drawing and ironing is supplied into the
[0017]
Next, as shown in FIG. 2B, the thin film elastic member 9 is expanded by a fluid pressure, and the thin film elastic member 9 is brought into close contact with the inner surface of the raw can 4, and an initial pressure P1 is applied. At this time, as shown in FIG. 2, the body of the raw can 4 has the outer surface other than the bulging
[0018]
With this initial pressure P1 applied, the
[0019]
In a state where the axial force F1 is applied, as shown in FIG. 2D, a bulge processing pressure P2 larger than the initial pressure P1 is applied to the raw can 4 to expand the
[0020]
Then, although not shown, the
[0021]
FIG. 3 shows a second embodiment of the method for manufacturing a bulge can according to the present invention. As in the first embodiment, a
[0022]
In the figure,
[0023]
At the time of bulge forming, as shown in FIG. 3 (a), the raw can 4 formed by draw-ironing is supplied into the
[0024]
Next, the
[0025]
With this initial pressure P1 applied, a downward axial force F1 larger than the buckling strength of the raw can 4 is applied to the upper end of the raw can 4 by the
[0026]
In a state where the axial force F1 is applied, as shown in FIG. 3 (c), a bulge processing pressure P2 larger than the initial pressure P1 is applied to the raw can 4, and the bulging portion is formed on the
[0027]
Then, although not shown, the
[0028]
In the present invention, the raw can 4 is not limited to the above-described embodiment, but can be a can body such as a draw-redrawing can, a draw-thinning redrawing can, or a draw-thinning redrawing-ironing can. Either a two-piece can (seamless can) having no vertical seam (side seam) on the side surface or a piece can having a seam on the side of the can body such as a welding can can be used.
[0029]
Further, in the present invention, the direction of the axial force F1 applied to the upper end of the raw can 4 is not limited to the above-described embodiment, and the raw can 4 is pushed up from below by the
[0030]
Further, in the present invention, the timing of applying the axial force F1 is not limited to the above embodiment, and may be applied almost simultaneously with the initial pressure P1, but from the viewpoint of buckling resistance, the initial pressure P1 is preceded. It is desirable to add.
[0031]
【The invention's effect】
As is apparent from the above description, according to the bulging can manufacturing method of the present invention, the initial pressure smaller than the bulging pressure of the raw can is applied before bulging to buckle the raw can at the time of bulging. Able to apply axial force of strength or more, dramatically improving the radial bulge workability of the body of the raw can, making it easy to manufacture without breaking the body, and excellent design Bulge cans.
[Brief description of the drawings]
FIG. 1 is an explanatory longitudinal sectional view showing a bulge can.
FIG. 2 is an explanatory view showing a first embodiment of the manufacturing method of the present invention.
FIG. 3 is an explanatory view showing a second embodiment of the manufacturing method of the present invention.
FIG. 4 is an explanatory view showing a conventional method for manufacturing a bulge can.
[Explanation of symbols]
REFERENCE SIGNS
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09366696A JP3582224B2 (en) | 1996-03-22 | 1996-03-22 | Bulge can manufacturing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09366696A JP3582224B2 (en) | 1996-03-22 | 1996-03-22 | Bulge can manufacturing method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09253763A JPH09253763A (en) | 1997-09-30 |
JP3582224B2 true JP3582224B2 (en) | 2004-10-27 |
Family
ID=14088731
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP09366696A Expired - Fee Related JP3582224B2 (en) | 1996-03-22 | 1996-03-22 | Bulge can manufacturing method |
Country Status (1)
Country | Link |
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JP (1) | JP3582224B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005014198A1 (en) * | 2003-08-08 | 2005-02-17 | Toyo Seikan Kaisha, Ltd. | Bulge can, method of manufacturing bulge can, and apparatus of manufacturing bulge can |
SI1713612T1 (en) * | 2004-01-15 | 2013-08-30 | Crebocan Ag | Method and device for producing a can body and can body |
BRPI1001904A2 (en) * | 2010-06-02 | 2011-07-05 | Vlademir Moreno | expansion process for forming two-piece metal packaging, and expansion process equipment for forming two-piece metal packaging |
EP2859966A1 (en) | 2013-10-08 | 2015-04-15 | Ardagh MP Group Netherlands B.V. | Shaped metcal container and a method for making a shaped metal container |
-
1996
- 1996-03-22 JP JP09366696A patent/JP3582224B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH09253763A (en) | 1997-09-30 |
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