JP2009082989A - Method and apparatus for manufacturing di can, and bottle can and can substrate - Google Patents

Method and apparatus for manufacturing di can, and bottle can and can substrate Download PDF

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JP2009082989A
JP2009082989A JP2008299869A JP2008299869A JP2009082989A JP 2009082989 A JP2009082989 A JP 2009082989A JP 2008299869 A JP2008299869 A JP 2008299869A JP 2008299869 A JP2008299869 A JP 2008299869A JP 2009082989 A JP2009082989 A JP 2009082989A
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axis direction
cylindrical body
opening
punch
bottomed cylindrical
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JP5015120B2 (en
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Tatsuya Hanabusa
達也 花房
Mitsuo Sakamaki
光男 坂巻
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Altemira Can Co Ltd
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Universal Can Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To form a DI can without causing the occurrence of not-ironed portion in a can opening part or fracture of can shell and to suppress deformation such as recess of the upper end part of the shell part of a bottle can and of a can substrate in the axial direction of the can. <P>SOLUTION: An apparatus 10 for manufacturing a DI can is provided with: a punch 11 which is supported movably forward and backward in the direction of the axial line O; and a plurality of ring-like ironing dies 12-14 which are arranged on the same axis as the punch 11, wherein the punch 11 is inserted into the inside of a metallic bottomed cylindrical body W and advances in the direction of the axial line O thereby the outer surface of the bottomed cylindrical body W is ironed sequentially by inner surfaces of the plurality of the ironing dies 12-14 and consequently the DI can is manufactured which is provided with: the opening part and the shell part which is connected to the lower end of the opening part in the axial direction of the can and extended downward in the axial direction of the can and in which the upper part in the axial direction of the can of the shell part is thinner than the opening part. On the outer surface of the punch 11, a recessed part which is recessed inward in the radial direction is formed over the whole circumference in a position corresponding to the upper end in the axial direction of the can in part where the shell part of the bottomed cylindrical body W is planned to be formed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、金属製の有底筒状体にしごき加工を施してＤＩ缶を製造するＤＩ缶の製造方法およびＤＩ缶の製造装置並びにＤＩ缶に基づいて形成されたボトル缶および缶基体に関するものである。   The present invention relates to a DI can manufacturing method, a DI can manufacturing apparatus for manufacturing a DI can by ironing a metal bottomed cylindrical body, a bottle can formed on the basis of the DI can, and a can base. It is.

この種のＤＩ缶は従来から、飲料を充填する容器としての缶基体やボトル缶を製造するのに用いられている。すなわち、缶基体の場合、ＤＩ缶の開口部にネックイン加工やフランジ加工が施され、胴部の缶軸方向上端に連設されるとともに缶軸方向上方へ向かうに従い漸次縮径した肩部と、該肩部の缶軸方向上端に連設されるとともに径方向外方へ折り曲げられたフランジ部とが形成される。その後、この缶基体に内容物が充填され、前記フランジ部に缶蓋が巻き締められることにより缶が形成される。また、ボトル缶の場合、ＤＩ缶の開口部にネックイン加工、ねじ成形加工、およびカール部形成加工等が施され、胴部の缶軸方向上端に連設されるとともに缶軸方向上方へ向かうに従い漸次縮径した肩部と、該肩部の缶軸方向上端に連設されるとともに缶軸方向上方へ延在した口金部とが形成される。その後、このボトル缶に内容物が充填された後に、前記口金部にキャップが螺着されてキャップ付ボトル缶が形成される。   This type of DI can is conventionally used to produce a can base or a bottle can as a container for filling a beverage. That is, in the case of a can base, the opening of the DI can is subjected to neck-in processing or flange processing, and is continuously provided at the upper end of the barrel in the can axis direction, and the shoulder portion gradually reduced in diameter toward the upper direction of the can axis. A flange portion is formed which is connected to the upper end in the can axis direction of the shoulder portion and is bent radially outward. Thereafter, the can base is filled with the contents, and a can lid is wound around the flange portion to form a can. In the case of bottle cans, the opening of the DI can is subjected to neck-in processing, screw forming processing, curl forming processing, etc., and is continuously provided at the upper end of the barrel in the can axis direction and directed upward in the can axis direction. Accordingly, a shoulder portion that is gradually reduced in diameter and a base portion that is connected to the upper end in the can axis direction of the shoulder portion and extends upward in the can axis direction are formed. Thereafter, after the bottle can is filled with contents, a cap is screwed onto the cap portion to form a bottle can with a cap.

これらの缶基体およびボトル缶においては、ＤＩ缶の開口部に前述のようなネックイン加工等といった過酷な加工が施されるため、このような加工に耐え得るようにＤＩ缶の開口部は比較的厚肉にしておく必要がある。
このようなＤＩ缶は従来から、下記特許文献１に示されるように、軸線方向に進退可能に支持されたパンチと、該パンチと同軸上に配設された複数のリング状のしごきダイスとを備えるＤＩ缶の製造装置において、前記パンチが金属製の有底筒状体の内部に挿入されて軸線方向に前進することにより、前記有底筒状体の外表面を前記複数のしごきダイスの内表面により順次しごくことにより形成されている。つまり、金属製の有底筒状体にしごき加工を複数回施すことにより、胴部の缶軸方向上部における肉を、この胴部の缶軸方向上端に連設された開口部に順次流動させて、この開口部が厚肉とされたＤＩ缶が形成されている。ここで、前記複数回のしごき加工のうち、特に最後のしごき加工においては、ＤＩ缶の開口部をその全周に亙って均一にしごき、かつこの部分における肉厚を全周に亙って均一にするために、このしごき率はできるだけ大きい方が望ましい。なお、しごき率とは、しごき前の肉厚としごき後の肉厚との差をしごき前の肉厚で除することにより算出されるものであって、いわゆる肉厚の減少率のことをいう。
特開平８−１０８２３５号公報 In these can bases and bottle cans, the opening of the DI can is subjected to severe processing such as neck-in processing as described above, so the opening of the DI can is compared to withstand such processing. It is necessary to make it thick.
Conventionally, as shown in Patent Document 1 below, such a DI can includes a punch supported so as to be movable back and forth in the axial direction, and a plurality of ring-shaped ironing dies arranged coaxially with the punch. In the DI can manufacturing apparatus, the punch is inserted into the bottomed cylindrical body made of metal and moved forward in the axial direction, so that the outer surface of the bottomed cylindrical body is placed inside the plurality of ironing dies. It is formed by squeezing sequentially on the surface. That is, by applying ironing to the bottomed cylindrical body made of metal a plurality of times, the meat in the upper portion of the barrel portion in the can axis direction is sequentially flowed to the opening portion continuously provided at the upper end of the barrel portion in the can axis direction. Thus, a DI can having a thick opening is formed. Here, among the plurality of ironing processes, particularly in the last ironing process, the opening of the DI can is uniformly ironed over the entire periphery, and the wall thickness in this part is applied over the entire periphery. In order to make it uniform, it is desirable that this ironing rate be as large as possible. The ironing rate is calculated by dividing the difference between the thickness before ironing and the thickness after ironing by the thickness before ironing, which is the so-called reduction rate of the wall thickness. .
JP-A-8-108235

ところが、ＤＩ缶を製造するに際して、一回のしごき加工でしごき率が４０％を超えると前記胴部が破断する、いわゆる胴切れが発生する可能性が高いため、このしごき率を大きくするには限界があり、前述した均一なしごきおよび均一な肉厚を実現することが困難であるという問題があった。このうち、前記均一なしごきを実現できない場合、この開口部のうち周方向でしごかれない部分が生ずる、いわゆる肉欠けが発生することになり、形成された缶基体およびボトル缶の外表面に印刷を施したときに、前記肉欠け部分が変色して容器自体の商品価値を著しく低下させるという問題がある。また、前記均一な肉厚を実現できない場合、特に缶基体において、そのフランジ部に缶蓋を全周に亙って均一に巻き締めることが困難になる虞がある。さらに、前記胴切れが発生した場合には、しごきダイスとパンチとが直に接することにより、これらの寿命を著しく低下させる虞もある。   However, when manufacturing a DI can, if the ironing rate exceeds 40% in a single ironing process, there is a high possibility that the body part will break, so-called torso-cutting occurs. There is a limit, and there is a problem that it is difficult to realize the above-described uniform ironing and uniform wall thickness. Among these, when the uniform ironing cannot be realized, a portion of the opening that is not squeezed in the circumferential direction is generated, so-called chipping occurs, and the formed can base and the outer surface of the bottle can are formed. When printing is performed, there is a problem in that the lack of meat portion is discolored and the commercial value of the container itself is significantly reduced. Moreover, when the said uniform thickness cannot be implement | achieved, especially in a can base | substrate, there exists a possibility that it may become difficult to wind up a can lid over the perimeter to the flange part uniformly. Furthermore, when the above-mentioned cylinder breakage occurs, the ironing die and the punch are in direct contact with each other, so that there is a risk that the service life of these will be significantly reduced.

ここで、前述のように形成されたＤＩ缶に基づいて缶基体およびボトル缶を形成すると、これらの缶基体およびボトル缶においては、その胴部の缶軸方向上部のうち、その上端部における肉が最も前記開口部に流動させられ易いため、この上端部は特に薄肉となっている。従って、この上端部に外力が作用することによって、容易に凹み等の変形が生ずる虞もあった。   Here, when the can base and the bottle can are formed based on the DI can formed as described above, in the can base and the bottle can, the meat at the upper end portion of the upper portion in the can axial direction of the trunk portion is formed. However, the upper end portion is particularly thin. Therefore, there is a possibility that deformation such as a dent easily occurs due to an external force acting on the upper end.

本発明は、このような背景の下になされたもので、その第１の目的は、ＤＩ缶を製造するに際して、この開口部をその全周に亙って均一にしごき、この部分における肉厚を全周に亙って均一にすること、および胴切れが発生するのを抑制することの双方を実現することができるＤＩ缶の製造方法およびＤＩ缶の製造装置を提供することにある。
また、第２の目的は、ボトル缶および缶基体の胴部における缶軸方向上端部に外力が作用することにより、この部分が凹む等の変形することを抑制することができる缶基体およびボトル缶を提供することにある。 The present invention has been made under such a background. The first object of the present invention is to produce a DI can by uniformly squeezing the opening over the entire circumference, and increasing the wall thickness in this portion. It is an object of the present invention to provide a DI can manufacturing method and a DI can manufacturing apparatus capable of realizing both uniforming of the entire length of the perimeter and suppressing the occurrence of a torsion.
In addition, the second object is to provide a can base and a bottle can which can be prevented from being deformed by the external force acting on the upper end of the body of the bottle can and the base of the can base. Is to provide.

このような課題を解決して、前記目的を達成するために、本発明のＤＩ缶の製造方法は、金属製の有底筒状体にしごき加工を複数回施して、開口部と、該開口部の缶軸方向下端に連設され缶軸方向下方に延びる胴部とを備え、該胴部の缶軸方向上部は前記開口部より薄肉とされたＤＩ缶を製造するＤＩ缶の製造方法であって、前記有底筒状体に最後のしごき加工を施して前記ＤＩ缶を形成する際に予め、前記有底筒状体において、前記胴部の形成予定部における缶軸方向上端部を、該上端部を除く前記胴部の形成予定部における缶軸方向上部の厚さより厚くしておき、その後しごき率４０％以下で前記最後のしごき加工を施すことを特徴とする。   In order to solve such problems and achieve the above-mentioned object, the DI can manufacturing method of the present invention includes a metal bottomed cylindrical body subjected to ironing a plurality of times, an opening, and the opening. A can that is continuously provided at the lower end of the can axis direction and extends downward in the can axis direction, and the upper portion of the can axis in the can axis direction is a thinner DI can. And, when forming the DI can by performing the final ironing process on the bottomed cylindrical body, in the bottomed cylindrical body, in the can axis direction upper end portion in the formation portion of the body portion, It is characterized in that it is thicker than the thickness of the upper portion in the can axis direction in the portion where the body portion is to be formed excluding the upper end portion, and then the final ironing is performed at a ironing rate of 40% or less.

この発明によれば、前記有底筒状体に最後のしごき加工を施して前記ＤＩ缶を形成する際に予め、前記胴部の形成予定部における缶軸方向上端部（以下、単に「厚肉部」という）を、該上端部を除く前記胴部の形成予定部における缶軸方向上部の厚さより厚くしておくので、最後のしごき加工において、前記厚肉部の肉を開口部に容易に流動させることが可能になる。従って、前記最後のしごき加工のしごき率を４０％以下としても、前記開口部を全周に亙って均一にしごくことが可能になるとともに、その肉厚を全周に亙って均一にすることが可能になる。さらに、しごき率を４０％以下としていることから、胴切れが発生することを確実に抑制することができる。   According to the present invention, when the DI can is formed by subjecting the bottomed cylindrical body to the final ironing process, the can axially upper end portion (hereinafter simply referred to as “thick-walled”) Part)) is made thicker than the thickness of the upper part in the can axis direction in the part where the body part is to be formed excluding the upper end part, so that in the final ironing process, the meat of the thick part can be easily formed in the opening part. It becomes possible to make it flow. Therefore, even if the ironing rate of the last ironing process is 40% or less, the opening can be made uniform over the entire circumference, and the thickness thereof can be made uniform over the entire circumference. It becomes possible. Furthermore, since the ironing rate is set to 40% or less, it is possible to reliably suppress the occurrence of torsion.

ここで、前記有底筒状体に少なくとも３回しごき加工を施して前記ＤＩ缶を形成するのが望ましい。この場合、最初のしごき加工により形成された前記厚肉部が、少なくとも１回しごかれ、この厚肉部の肉が前記開口部へ流動させられた後に、有底筒状体に最後のしごき加工が施され、ＤＩ缶が形成されることになる。従って、前記厚肉部に過負荷を作用させることなく、この厚肉部における肉を前記開口部に良好に流動させることが可能になり、胴切れを発生させることなく、開口部の肉厚をその全周に亙って均一にすることができるとともに、肉欠けが発生することを確実に抑制することができる。   Here, it is desirable that the DI can be formed by ironing the bottomed cylindrical body at least three times. In this case, after the thick part formed by the first ironing process is squeezed at least once and the thick part of the thick part is flowed to the opening, the final ironing process is performed on the bottomed cylindrical body. Is applied to form a DI can. Therefore, it is possible to flow the meat in the thick part well to the opening without causing an overload to act on the thick part, and the thickness of the opening can be reduced without causing a torso. While being able to make it uniform over the perimeter, it can suppress reliably that a meat chip occurs.

また、本発明のＤＩ缶の製造装置は、軸線方向に進退可能に支持されたパンチと、該パンチと同軸上に配設された複数のリング状のしごきダイスとを備え、前記パンチが金属製の有底筒状体の内部に挿入されて軸線方向に前進することにより、前記有底筒状体の外表面を前記複数のしごきダイスの内表面により順次しごいて、開口部と、該開口部の缶軸方向下端に連設され缶軸方向下方に延びる胴部とを備え、該胴部の缶軸方向上部は前記開口部より薄肉とされたＤＩ缶を製造するＤＩ缶の製造装置であって、前記パンチの外表面には、前記有底筒状体の、前記胴部の形成予定部における缶軸方向上端部と対応する位置に、その全周に亙って径方向内側へ凹む凹部が形成されていることを特徴とする。   The DI can manufacturing apparatus of the present invention includes a punch supported so as to be movable back and forth in the axial direction, and a plurality of ring-shaped ironing dies arranged coaxially with the punch, wherein the punch is made of metal. The inner surface of the bottomed cylindrical body is inserted into the bottomed cylindrical body and advanced in the axial direction so that the outer surface of the bottomed cylindrical body is sequentially squeezed by the inner surfaces of the plurality of ironing dies. A can that is continuously provided at the lower end of the can axis direction and extends downward in the can axis direction, and the upper portion of the can axis direction of the can is a DI can manufacturing apparatus for manufacturing a DI can that is thinner than the opening. In addition, the outer surface of the punch is recessed radially inward over the entire circumference at a position corresponding to the upper end portion in the can axis direction in the portion where the body portion is to be formed of the bottomed cylindrical body. A recess is formed.

この発明によれば、前記パンチの外表面には、前記胴部の形成予定部における缶軸方向上端部と対応する位置に、その全周に亙って径方向内側へ凹む凹部が形成されているので、このパンチを前進させて有底筒状体をしごく過程で前記厚肉部を形成することが可能になり、前記作用効果を有するＤＩ缶の製造方法を高効率に実現することができる。   According to this invention, the outer surface of the punch is formed with a recess that is recessed radially inward over the entire circumference at a position corresponding to the upper end portion in the can axis direction of the formation portion of the body portion. Therefore, it is possible to form the thick part in the process of squeezing the bottomed cylindrical body by advancing this punch, and the manufacturing method of the DI can having the above-described effects can be realized with high efficiency. .

また、本発明のボトル缶は、大径の胴部と、該胴部の缶軸方向上端に連設されるとともに缶軸方向上方へ向かうに従い漸次縮径した肩部と、該肩部の缶軸方向上端に連設されるとともに缶軸方向上方へ延在した口金部とを備えるボトル缶であって、請求項１または２に記載の製造方法により製造されたＤＩ缶に基づいて製造され、前記胴部の缶軸方向上端部は、該上端部を除く前記胴部の缶軸方向上部における肉厚より厚くされていることを特徴とする。   Further, the bottle can of the present invention includes a large-diameter barrel, a shoulder that is connected to the upper end of the barrel in the can axis direction, and has a diameter that gradually decreases toward the upper side in the can axis, and the can of the shoulder It is a bottle can provided with a base part continuously provided at the upper end in the axial direction and extending upward in the axial direction of the can, and is manufactured based on the DI can manufactured by the manufacturing method according to claim 1 or 2. An upper end portion in the can axis direction of the trunk portion is thicker than a thickness at an upper portion in the can axis direction of the trunk portion excluding the upper end portion.

また、本発明の缶基体は、大径の胴部と、該胴部の缶軸方向上端に連設されるとともに缶軸方向上方へ向かうに従い漸次縮径した肩部と、該肩部の缶軸方向上端に連設されるとともに径方向外方へ折り曲げられたフランジ部とを備え、該フランジ部に缶蓋が巻き締められる構成とされた缶基体であって、請求項１または２に記載の製造方法により製造されたＤＩ缶に基づいて製造され、前記胴部の缶軸方向上端部は、該上端部を除く前記胴部の缶軸方向上部における肉厚より厚くされていることを特徴とする。   The can base of the present invention includes a large-diameter barrel, a shoulder that is connected to the upper end of the barrel in the can axis direction, and that gradually decreases in diameter toward the upper direction of the can axis, and the can of the shoulder 3. A can base comprising a flange portion continuously provided at an upper end in the axial direction and bent outward in a radial direction, wherein a can lid is wound around the flange portion. It is manufactured based on the DI can manufactured by the manufacturing method of, the can axis direction upper end portion of the barrel portion is thicker than the thickness at the upper portion of the barrel portion in the can axis direction excluding the upper end portion. And

これらの発明によれば、前記胴部の缶軸方向上端部は、該上端部を除く前記胴部の缶軸方向上部における肉厚より厚くされているので、この部分に外力が作用することによって、凹み等の変形が発生することを抑制することができる。ところで、ボトル缶の場合、その外表面のうち、前記胴部の缶軸方向上端部が径方向外方へ最も突出した部分の一部を構成するとともに、厚肉とされた肩部と隣接しているので、この部分は特に凹みが発生し易いため、前述した変形の発生抑制効果が特に著しく奏されることになる。また、前記ＤＩ缶に基づいてボトル缶を形成する場合においては、強度上の理由により、一般にＤＩ缶の前記開口部のうち最も肉厚の大きい部分の肉厚を、前記胴部のうち最も肉厚の小さい部分の肉厚より８０μm以上大きくする必要があり、このようなＤＩ缶を形成するには、従来では必然的に最後のしごき加工のしごき率を大きくせざるを得なかったため、前述した、前記最後のしごき加工のしごき率を４０％以下としても、前記開口部を全周に亙って均一にしごくことが可能になるとともに、その肉厚を全周に亙って均一にすることが可能になるといった作用効果が特に著しく奏されることになる。   According to these inventions, since the upper end portion in the can axis direction of the body portion is thicker than the wall thickness in the upper portion in the can axis direction of the body portion excluding the upper end portion, an external force acts on this portion. The occurrence of deformation such as dents can be suppressed. By the way, in the case of bottle cans, the upper end portion in the can axis direction of the body portion of the outer surface constitutes a part of the most projecting portion radially outward, and is adjacent to the thick shoulder portion. Therefore, this portion is particularly prone to dents, so that the effect of suppressing the occurrence of deformation described above is particularly remarkable. Further, in the case of forming a bottle can based on the DI can, for the reasons of strength, generally the thickness of the thickest portion of the opening of the DI can is set to be the thickest of the barrel portion. Since it is necessary to make it larger than the thickness of the small thickness portion by 80 μm or more, in order to form such a DI can, conventionally, the ironing rate of the last ironing process has inevitably been increased. Even if the ironing rate of the last ironing process is 40% or less, the opening can be made uniform over the entire circumference and the wall thickness can be made uniform over the entire circumference. In particular, the effect of enabling the operation is remarkably exhibited.

ここで、前記ボトル缶は、前記肩部および前記口金部が前記ＤＩ缶の前記開口部に少なくとも１５回ネックイン加工されて形成されることが望ましい。この場合、肩部と胴部との肉厚の差が特に大きくなるので、ボトル缶に缶軸方向下方に向けた力、すなわち圧縮力が作用した場合、前記胴部の缶軸方向上端部に応力が集中し易く、座屈強度が低下する虞があるが、この部分は胴部の缶軸方向上部の中で最も厚肉とされているので、この座屈強度の低下を最小限に抑制することができる。   Here, it is preferable that the bottle can is formed by necking in at least 15 times the shoulder portion and the base portion at the opening of the DI can. In this case, the difference in thickness between the shoulder portion and the body portion is particularly large, so that when a force directed downward in the can axis direction, that is, a compressive force, acts on the bottle can, the upper end portion in the can axis direction of the body portion. Stress tends to concentrate and buckling strength may decrease, but this part is the thickest of the upper part of the barrel in the can axis direction, so this reduction in buckling strength is minimized. can do.

本発明によれば、ＤＩ缶を製造するに際して、この開口部をその全周に亙って均一にしごき、この部分における肉厚を全周に亙って均一にすること、および胴切れが発生するのを抑制することの双方を実現することができる。また、ボトル缶および缶基体の胴部における缶軸方向上端部に外力が作用することにより、この部分が凹む等の変形することを抑制することができる。   According to the present invention, when the DI can is manufactured, the opening is uniformly ironed over the entire circumference, the wall thickness in the part is made uniform over the entire circumference, and the cylinder is cut off. Both of these can be realized. Further, when an external force acts on the upper end portion in the can axis direction of the body portion of the bottle can and the can base body, it is possible to suppress deformation such as a depression of this portion.

図１および図２は本発明の一実施形態に係るＤＩ缶の製造方法を実施するためのＤＩ缶の製造装置を示すものであって、この製造装置１０は、図２に示すように、軸線Ｏ方向に進退可能に支持されたパンチ１１と、該パンチ１１と同軸上に配設された複数のリング状のしごきダイス１２〜１４とを備え、パンチ１１が金属製（例えばアルミニウム合金）の有底筒状体Ｗの内部に挿入されて軸線Ｏ方向に前進することにより、有底筒状体Ｗの外表面が前記複数のしごきダイス１２〜１４の内表面に順次しごかれて、開口部と、該開口部の缶軸方向下端に連設され缶軸方向下方に延びる胴部とを備え、該胴部の缶軸方向上部は前記開口部より薄肉とされたＤＩ缶が形成されるようになっている。   1 and 2 show a DI can manufacturing apparatus for carrying out a method of manufacturing a DI can according to an embodiment of the present invention. The manufacturing apparatus 10 has an axis line as shown in FIG. A punch 11 supported so as to be able to advance and retreat in the O direction, and a plurality of ring-shaped ironing dies 12 to 14 arranged coaxially with the punch 11, the punch 11 being made of metal (for example, an aluminum alloy) By being inserted into the bottom cylindrical body W and moving forward in the direction of the axis O, the outer surface of the bottomed cylindrical body W is sequentially squeezed onto the inner surfaces of the plurality of squeezing dies 12 to 14, and the opening And a barrel portion that is provided at the lower end in the can axis direction of the opening and extends downward in the can axis direction, and a DI can whose upper portion in the can axis direction of the barrel portion is thinner than the opening is formed. It has become.

さらに本実施形態では、複数のしごきダイス１２〜１４の配設位置よりパンチ１１の前進方向における後方側に、リング状の再絞りダイス１５がしごきダイス１２〜１４と同軸的に配設されている。また、再絞りダイス１５の配設位置よりパンチ１１の前進方向における後方側に、軸線Ｏ方向に進退可能に支持され、内側にパンチ１１が挿入されるとともに、その外周面が有底筒状体Ｗの内周面を支持する構成とされた円筒状のカップホルダスリーブ１６が配設されている。さらに、各しごきダイス１２〜１４において、パンチ１１の前進方向における前方（図２の左方）には、リング状のパイロットリング１７が各しごきダイス１２〜１４と同軸的に配設されており、有底筒状体Ｗが各しごきダイス１２〜１４にしごかれる過程で、その缶軸が各ダイス１２〜１４の軸線Ｏに対して位置ずれした場合においても、パンチ１１がそれぞれのダイス１２〜１４に衝突することを防止できるようになっている。   Furthermore, in this embodiment, a ring-shaped redrawing die 15 is coaxially arranged with the ironing dies 12 to 14 on the rear side in the advance direction of the punch 11 from the arrangement position of the plurality of ironing dies 12 to 14. . Further, the punch 11 is supported so as to be able to advance and retreat in the direction of the axis O on the rear side in the forward direction of the punch 11 from the position at which the redrawing die 15 is disposed. A cylindrical cup holder sleeve 16 configured to support the inner peripheral surface of W is disposed. Further, in each of the ironing dies 12-14, a ring-shaped pilot ring 17 is arranged coaxially with each of the ironing dies 12-14 in front of the punch 11 in the forward direction (left side in FIG. 2). Even when the can shaft is displaced with respect to the axis O of each die 12-14 in the process in which the bottomed cylindrical body W is squeezed by each ironing die 12-14, the punch 11 is moved to each die 12-14. Can be prevented from colliding with.

ところで、複数のしごきダイス１２〜１４は、本実施形態では、パンチ１１の前進方向後方側から前方側へ向けて順次、ファーストダイス１２とミドルダイス１３とエンドダイス１４とが軸線Ｏと同軸的に配設された構成となっており、つまり３つのしごきダイス１２〜１４を備えている。これらのしごきダイス１２〜１４の内径は、各しごきダイス１２〜１４によって、有底筒状体Ｗにしごき率が４０％以下のしごき加工が施されるような大きさとされている。例えば、再絞りダイス１６により絞り加工された有底筒状体Ｗが、ファーストダイス１２によってしごき率４０％以下でしごかれ、またファーストダイス１２によりしごかれた有底筒状体Ｗが、ミドルダイス１３によってしごき率４０％以下でしごかれ、さらにミドルダイス１３によりしごかれた有底筒状体Ｗが、エンドダイス１４によってしごき率４０％以下でしごかれるようになっている。   By the way, in this embodiment, the plurality of ironing dies 12 to 14 are arranged such that the first die 12, the middle die 13, and the end die 14 are coaxial with the axis O sequentially from the rear side in the forward direction of the punch 11 to the front side. It is the arrangement | positioned structure, ie, the three ironing dies 12-14 are provided. The inner diameters of these ironing dies 12 to 14 are set to a size such that the ironing process with the ironing rate of 40% or less is performed on the bottomed cylindrical body W by the ironing dies 12 to 14. For example, the bottomed cylindrical body W drawn by the redrawing die 16 is rubbed at a squeezing rate of 40% or less by the first die 12, and the bottomed cylindrical body W squeezed by the first die 12 is The bottomed cylindrical body W that is squeezed by the middle die 13 with a squeezing rate of 40% or less and that is squeezed by the middle die 13 is squeezed by the end die 14 with a squeezing rate of 40% or less.

また、パンチ１１は、円筒状に形成されるとともにその外表面が有底筒状体Ｗの内表面と接する構成とされたパンチスリーブ２０と、このパンチスリーブ２０の内部に配設されるとともに、その後端部がパンチスリーブ２０の前進方向における後側の端面から突出したシャンク２１とを備えている。シャンク２１は図示しない駆動手段に連結され、この駆動手段が駆動されることにより、パンチ１１が進退移動されるようになっている。   In addition, the punch 11 is formed in a cylindrical shape and the outer surface thereof is configured to be in contact with the inner surface of the bottomed cylindrical body W, and the punch 11 is disposed inside the punch sleeve 20. The rear end portion includes a shank 21 protruding from the rear end surface in the forward direction of the punch sleeve 20. The shank 21 is connected to a driving means (not shown), and the punch 11 is moved forward and backward by driving the driving means.

ここで、パンチスリーブ２０の外表面には、図１に示すように、有底筒状体Ｗの、前記胴部の形成予定部における缶軸方向上端部と対応する位置に、その全周に亙って径方向内側へ凹む凹部２２が形成されている。
凹部２２は、パンチスリーブ２０の前進方向における先端側から順次、その前進方向における後方側へ向かうに従い漸次縮径した第１傾斜部２２ａと、この第１傾斜部２２ａに連設されるとともに、軸線Ｏに対して平行に延在したストレート部２２ｂと、このストレート部２２ｂに連設されるとともに、前記後方側へ向かうに従い漸次縮径した第２傾斜部２２ｃとを備えている。そして、第２傾斜部２２ｃの後端は、形成するＤＩ缶の前記開口部を形成する開口部形成部２０ｂに連設されており、この開口部形成部２０ｂは、パンチスリーブ２０において、形成するＤＩ缶と対応する部分のうち最も外径が小さくされている。なお、第１傾斜部２２ａの傾斜角度は、軸線Ｏに対して例えば約０．８４°とされ、第２傾斜部２２ｃの傾斜角度は、軸線Ｏに対して例えば約０．１７°とされている。また、ストレート部２２ｂの表面とパンチスリーブ２０の先端部（凹部２２より先端側の部分）２０ａの外表面との距離、つまり凹部２２の深さは約０．００５ｍｍとされている。 Here, on the outer surface of the punch sleeve 20, as shown in FIG. 1, at the position corresponding to the upper end portion in the can axis direction in the portion where the body portion is to be formed, As a result, a recess 22 that is recessed radially inward is formed.
The concave portion 22 is connected to the first inclined portion 22a, which is gradually reduced in diameter from the front end side in the forward direction of the punch sleeve 20 toward the rear side in the forward direction, and the first inclined portion 22a. A straight portion 22b extending in parallel with O and a second inclined portion 22c that is connected to the straight portion 22b and gradually decreases in diameter toward the rear side. The rear end of the second inclined portion 22c is connected to the opening forming portion 20b that forms the opening of the DI can to be formed. The opening forming portion 20b is formed in the punch sleeve 20. The outer diameter of the portion corresponding to the DI can is the smallest. The inclination angle of the first inclined portion 22a is, for example, about 0.84 ° with respect to the axis O, and the inclination angle of the second inclined portion 22c is, for example, about 0.17 ° with respect to the axis O. Yes. Further, the distance between the surface of the straight portion 22b and the outer surface of the front end portion (portion on the front end side of the recess 22) 20a of the punch sleeve 20, that is, the depth of the recess 22 is about 0.005 mm.

次に、以上のように構成されたＤＩ缶の製造装置１０により有底筒状体ＷからＤＩ缶を製造する方法について説明する。
まず、その前進方向における後端側に位置するパンチ１１およびカップホルダスリーブ１６と、再絞りダイス１５との間に、これら１５、１６と同軸上に有底筒状体Ｗを配置し、その後パンチ１１およびカップホルダスリーブ１６を前進させて、これら１１、１６の先端面を有底筒状体Ｗの内側底面に押付ける。この際、パンチ１１の先端面は、有底筒状体Ｗの内側底面のうち、再絞りダイス１５の貫通孔１５ａと対応した部分に押付けられる一方、カップホルダスリーブ１６の先端面は、有底筒状体Ｗの内側底面のうち、再絞りダイス１５の貫通孔１５ａの外周縁部と対応した部分に押付けられる。つまり、カップホルダスリーブ１６は、その先端面が有底筒状体Ｗの内側底面を介して再絞りダイス１５の一方の表面１５ｂに衝突することにより、その前進移動が規制される。この状態で、パンチ１１のみをさらに前進させることにより、有底筒状体Ｗを、その外表面がカップホルダスリーブ１６の内表面に支持された状態で、再絞りダイス１５の内側に押込み、有底筒状体Ｗに再絞り加工を施す。すなわち、再絞り加工によって、有底筒状体Ｗの底面における外周縁部が缶軸方向上方へ向けて折り曲げられ、有底筒状体Ｗの外径および内径が縮径されるとともに、この筒状体Ｗの軸方向高さが高められる。 Next, a method for manufacturing a DI can from the bottomed tubular body W by the DI can manufacturing apparatus 10 configured as described above will be described.
First, a bottomed tubular body W is arranged coaxially with these punches 15 and 16 between the punch 11 and the cup holder sleeve 16 located on the rear end side in the forward direction and the redrawing die 15, and then the punch 11 and the cup holder sleeve 16 are advanced, and the tip surfaces of these 11 and 16 are pressed against the inner bottom surface of the bottomed cylindrical body W. At this time, the front end surface of the punch 11 is pressed against a portion of the inner bottom surface of the bottomed cylindrical body W corresponding to the through hole 15a of the redraw die 15 while the front end surface of the cup holder sleeve 16 is bottomed. The inner bottom surface of the cylindrical body W is pressed against a portion corresponding to the outer peripheral edge portion of the through hole 15a of the redraw die 15. That is, the forward movement of the cup holder sleeve 16 is restricted when the tip surface of the cup holder sleeve 16 collides with one surface 15b of the redraw die 15 via the inner bottom surface of the bottomed cylindrical body W. In this state, by further advancing only the punch 11, the bottomed tubular body W is pushed into the inside of the redrawing die 15 with its outer surface supported by the inner surface of the cup holder sleeve 16. A redrawing process is applied to the bottom cylindrical body W. That is, by redrawing, the outer peripheral edge of the bottom surface of the bottomed cylindrical body W is bent upward in the can axis direction, the outer diameter and inner diameter of the bottomed cylindrical body W are reduced, and this cylinder The axial height of the W is increased.

この際の有底筒状体Ｗの肉厚分布を図３に示す。この図において、横軸は有底筒状体Ｗの外側底面からの高さ位置を示し、縦軸は肉厚を示すものであって、缶軸を中心として周方向に４５°づつ間隔をあけた周方向位置ごとに、複数の前記高さ位置で測定した肉厚を示すものである。この図から、再絞り加工後の有底筒状体Ｗの肉厚は、底面側か開口部側（缶軸方向上方）へ向かうに従い漸次その肉厚が大きくなっていることが確認される。   The thickness distribution of the bottomed cylindrical body W at this time is shown in FIG. In this figure, the horizontal axis indicates the height position from the outer bottom surface of the bottomed cylindrical body W, and the vertical axis indicates the thickness, with an interval of 45 ° in the circumferential direction about the can axis. For each circumferential position, the thickness measured at a plurality of the height positions is shown. From this figure, it is confirmed that the thickness of the bottomed tubular body W after the redrawing process gradually increases as it goes toward the bottom surface or the opening (upward in the can axis direction).

その後さらに、パンチ１１を前進させ、ファーストダイス１２の内側にパンチ１１とともに有底筒状体Ｗを押込み、この筒状体Ｗにしごき率４０％以下で最初のしごき加工を施す。すなわち、パンチ１１の外周面とファーストダイス１２の内周面とにより有底筒状体Ｗの内外周面を挟み込んだ状態で、パンチ１１および有底筒状体Ｗを前進移動させることにより、有底筒状体Ｗの肉を缶軸方向上方へ流動させる。ここで、パンチ１１のパンチスリーブ２０において、形成するＤＩ缶と対応する部分としての先端部２０ａ、凹部２２および開口部形成部２０ｂは、その外径がこの順に小さくされているので、このしごき加工により、有底筒状体Ｗの肉厚は、図４に示すように、パンチスリーブ２０の前記先端部２０ａの缶軸方向上部と対応する部分（図４に示すＡ１部）、凹部２２と対応する部分（図４に示すＢ１部）、および開口部形成部２０ｂと対応する部分（図４に示すＣ１部）の順に大きくなる。   Thereafter, the punch 11 is further advanced, and the bottomed cylindrical body W is pushed into the first die 12 together with the punch 11, and the first ironing process is performed on the cylindrical body W at a squeezing rate of 40% or less. That is, the punch 11 and the bottomed cylindrical body W are moved forward while the inner peripheral surface of the bottomed cylindrical body W is sandwiched between the outer peripheral surface of the punch 11 and the inner peripheral surface of the first die 12. The meat of the bottom cylindrical body W is caused to flow upward in the can axis direction. Here, in the punch sleeve 20 of the punch 11, the tip 20a, the recess 22 and the opening forming part 20b as the parts corresponding to the DI can to be formed have the outer diameters reduced in this order. Accordingly, as shown in FIG. 4, the thickness of the bottomed cylindrical body W corresponds to the portion (A1 portion shown in FIG. 4) corresponding to the upper portion in the can axis direction of the tip portion 20 a of the punch sleeve 20 and the concave portion 22. And the portion corresponding to the opening forming portion 20b (C1 portion shown in FIG. 4) in this order.

有底筒状体Ｗにおける前記Ａ１部、Ｂ１部およびＣ１部は、本実施形態では、前記Ｃ１部がＤＩ缶における開口部の形成予定部に相当し、前記Ｂ１部がＤＩ缶における胴部の形成予定部の缶軸方向上端部に相当し、前記Ａ１部が前記Ｂ１部を除く前記胴部の形成予定部における缶軸方向上部に相当する。すなわち、有底筒状体Ｗにおいて、ＤＩ缶の胴部の形成予定部における缶軸方向上端部Ｂ１は、この上端部Ｂ１を除く前記胴部の形成予定部における缶軸方向上部Ａ１の厚さより厚く、この上端部Ｂ１の缶軸方向上端に連設される開口部形成予定部Ｃ１の厚さより薄くなる。なお、有底筒状体Ｗにおいて、パンチスリーブ２０の前記先端部２０ａと対応する部分のうち、前記Ａ１部を除く部分、つまりその缶軸方向下部と対応する部分（図４に示すＤ１部）は、前述のしごき加工によっても、その肉が缶軸方向上方へ流動され難いため、その肉厚は、前記胴部の形成予定部における缶軸方向上端部Ｂ１の肉厚以上になる。   In the present embodiment, the A1, B1 and C1 parts in the bottomed cylindrical body W correspond to the part where the opening part is to be formed in the DI can, and the B1 part is the body part of the DI can. The A1 portion corresponds to the upper end portion in the can axis direction of the planned formation portion, and the A1 portion corresponds to the upper portion in the can axis direction of the formation portion of the body portion excluding the B1 portion. In other words, in the bottomed tubular body W, the can axis direction upper end portion B1 of the DI can body forming portion is larger than the thickness of the can shaft forming upper portion A1 except for the upper end portion B1. It is thicker and thinner than the thickness of the opening formation scheduled portion C1 that is connected to the upper end of the upper end portion B1 in the can axis direction. In the bottomed tubular body W, of the portion corresponding to the tip portion 20a of the punch sleeve 20, the portion excluding the A1 portion, that is, the portion corresponding to the lower portion in the can axis direction (D1 portion shown in FIG. 4). Since the meat is not easily flowed upward in the can axis direction even by the ironing process described above, the thickness is equal to or greater than the thickness of the upper end portion B1 in the can axis direction in the portion where the body portion is to be formed.

次に、前述と同様にして、ミドルダイス１３により有底筒状体Ｗに、しごき率４０％以下でしごき加工を施す。この場合、パンチスリーブ２０の前記先端部２０ａにより、図４の有底筒状体Ｗにおいて、前記胴部の形成予定部における缶軸方向上部のうちその上端部Ｂ１を除く部分Ａ１の肉が、前記胴部の形成予定部における缶軸方向上端部Ｂ１、および開口部形成予定部Ｃ１に流動させられる。さらに、この前工程でファーストダイス１２により、図４に示す有底筒状体Ｗの、前記胴部の形成予定部における缶軸方向上端部Ｂ１に流動させられていた肉が、開口部形成予定部Ｃ１に流動させられる。以上により、図５に示すように、胴部形成予定部の缶軸方向上部Ａ１、Ｂ１および開口部形成予定部Ｃ１が薄肉にされ、これらＡ１、Ｂ１、Ｃ１の中でも特に、胴部形成予定部の缶軸方向上部Ａ１、Ｂ１の肉が開口部形成予定部Ｃ１側へ流動させられて薄肉とされる。これにより、有底筒状体Ｗの缶軸方向における高さが高められるとともに、開口部形成予定部Ｃ１の肉厚が所定値以上に維持され、胴部形成予定部の缶軸方向上部Ａ２、Ｂ２および開口部形成予定部Ｃ２を有する有底筒状体Ｗが得られる。   Next, in the same manner as described above, ironing is performed on the bottomed tubular body W with the middle die 13 at an ironing rate of 40% or less. In this case, in the bottomed cylindrical body W in FIG. 4, the meat of the portion A1 excluding the upper end B1 in the upper portion in the can axis direction in the portion where the body portion is to be formed is formed by the tip portion 20a of the punch sleeve 20. It is made to flow to the can axial direction upper end part B1 and the opening part formation plan part C1 in the formation part of the said trunk | drum. Further, in the previous step, the first die 12 causes the meat that has been flowed to the upper end B1 in the can axis direction in the portion where the body portion is to be formed of the bottomed cylindrical body W shown in FIG. It is made to flow into part C1. As described above, as shown in FIG. 5, the can axis formation upper portions A1 and B1 and the opening formation planned portion C1 are thinned, and among these A1, B1 and C1, in particular, the trunk formation planned portion The can axis direction upper portions A1 and B1 are made to flow thin toward the opening portion formation scheduled portion C1 side. Accordingly, the height of the bottomed cylindrical body W in the can axis direction is increased, the thickness of the opening formation planned portion C1 is maintained at a predetermined value or more, and the can axis formation upper portion A2 of the barrel formation planned portion, The bottomed cylindrical body W having B2 and the opening formation scheduled portion C2 is obtained.

さらに、この有底筒状体Ｗに、ミドルダイス１３と同様にして、エンドダイス１４によるしごき加工、すなわち最後のしごき加工を施し、図６に示すような、胴部の缶軸方向上端部Ｂ３が、この上端部Ｂ３を除く胴部の缶軸方向上部Ａ３より厚肉とされ、かつ開口部Ｃ３より薄肉とされるとともに、開口部Ｃ３の周方向における肉厚のばらつきが抑えられたＤＩ缶が形成される。   Further, the bottomed cylindrical body W is subjected to the ironing process by the end die 14, that is, the final ironing process, in the same manner as the middle die 13, and as shown in FIG. However, the DI can is made thicker than the upper portion A3 in the can axis direction of the body portion excluding the upper end B3, and thinner than the opening C3, and the variation in the thickness in the circumferential direction of the opening C3 is suppressed. Is formed.

ところで、本実施形態では、凹部２２とパンチスリーブ２０の先端との距離は、形成するＤＩ缶において、胴部の缶軸方向上端部Ｂ３と外側底面との距離と同一とされており、図４から図６に示すように、前記胴部の形成予定部における缶軸方向上部Ａ１、Ｂ１およびＡ２、Ｂ２の前記外側底面からの距離は、しごきダイス１２〜１４にしごかれる過程において不変であり、この缶軸方向上部Ａ１、Ｂ１およびＡ２、Ｂ２は、順次しごかれ薄肉とされることにより、ＤＩ缶の胴部における缶軸方向上部Ａ３、Ｂ３に形成される。   By the way, in the present embodiment, the distance between the recess 22 and the tip of the punch sleeve 20 is the same as the distance between the can axial direction upper end B3 of the trunk and the outer bottom surface in the formed DI can. As shown in FIG. 6, the distance from the outer bottom surface of the can axis direction upper portion A1, B1 and A2, B2 in the formation portion of the body portion is unchanged in the process of squeezing the ironing dies 12-14, The can axis direction upper parts A1, B1 and A2, B2 are formed in the can axis direction upper parts A3, B3 in the body portion of the DI can by being gradually thinned.

このように形成されたＤＩ缶は例えば、開口部Ｃ３に少なくとも１５回のネックイン加工が施されて、胴部Ａ３、Ｂ３、Ｄ３の缶軸方向上端に連設されるとともに缶軸方向上方へ向かうに従い漸次縮径された肩部と、該肩部の缶軸方向上端に連設されるとともに缶軸方向上方へ延在する口金部とを形成した後に、この口金部にねじ成形加工、カール部形成加工が施されて、ボトル缶に形成される。このように形成されたボトル缶においては、図７および図８に示すように、胴部Ａ４、Ｂ４、Ｄ４の缶軸方向上端部Ｂ４は、該上端部Ｂ４を除く前記胴部の缶軸方向上部Ａ４における肉厚より厚くなる。この厚さの差は、具体的にはＤＩ缶におけるものと略同等であるが、図７および図８に示す例では、約０．０１ｍｍとなっている。また、前記上端部Ｂ４の缶軸方向下端と、ボトル缶の外側底面との距離、および前記上端部Ｂ４の缶軸方向における長さは、ＤＩ缶若しくは形成するボトル缶のサイズ（例えば容量）によって異なり、例えばボトル缶の全長が１３３ｍｍの場合、前記距離は４０ｍｍ以上６４ｍｍ以下、前記長さは約２５ｍｍとされ、またボトル缶の全長が１６４ｍｍの場合、前記距離は５０ｍｍ以上８０ｍｍ以下、前記長さは約３０ｍｍとされ、またボトル缶の全長が１９５ｍｍの場合、前記距離は８０ｍｍ以上１２０ｍｍ以下、前記長さは約４０ｍｍとされる。   For example, the DI can formed in this way is subjected to at least 15 neck-ins on the opening C3, and is continuously provided at the upper end in the can axis direction of the body portions A3, B3, and D3 and upward in the can axis direction. After forming a shoulder portion that is gradually reduced in diameter as it goes and a base portion that is connected to the upper end of the shoulder portion in the can axis direction and extends upward in the can axis direction, a screw forming process and curling are performed on the base portion. A part forming process is performed to form a bottle can. In the bottle can formed in this way, as shown in FIGS. 7 and 8, the can axis direction upper end portion B4 of the trunk portions A4, B4, D4 is in the can axis direction of the barrel portion excluding the upper end portion B4. It becomes thicker than the wall thickness in the upper part A4. Specifically, the difference in thickness is substantially equivalent to that in the DI can, but in the example shown in FIGS. 7 and 8, it is about 0.01 mm. The distance between the lower end in the can axis direction of the upper end B4 and the outer bottom surface of the bottle can and the length in the can axis direction of the upper end B4 depend on the size (for example, capacity) of the DI can or the bottle can to be formed. For example, when the total length of the bottle can is 133 mm, the distance is 40 mm to 64 mm and the length is about 25 mm. When the total length of the bottle can is 164 mm, the distance is 50 mm to 80 mm and the length When the total length of the bottle can is 195 mm, the distance is 80 mm or more and 120 mm or less, and the length is about 40 mm.

なお、前記ＤＩ缶に基づいて、胴部の缶軸方向上端に連設されるとともに缶軸方向上方へ向かうに従い漸次縮径した肩部と、該肩部の缶軸方向上端に連設されるとともに径方向外方へ折り曲げられたフランジ部と備え、このフランジ部に缶蓋が巻き締められることにより缶が形成される構成とされた缶基体を形成することも可能である。この場合、前記ＤＩ缶の開口部Ｃ３にネックイン加工やフランジ加工を施すことにより形成される。   In addition, based on the DI can, the shoulder is continuously provided at the upper end in the can axis direction, the shoulder is gradually reduced in diameter toward the upper direction of the can axis, and the shoulder is continuously provided at the upper end in the can axis direction. It is also possible to form a can base having a flange portion bent outward in the radial direction and having a can formed by winding a can lid around the flange portion. In this case, it is formed by performing neck-in processing or flange processing on the opening C3 of the DI can.

以上説明したように、本実施形態によるＤＩ缶の製造方法によれば、有底筒状体Ｗにエンドダイス１４による最後のしごき加工を施して前記ＤＩ缶を形成する際に予め、前記胴部の形成予定部Ａ１、Ｂ１、Ｄ１、およびＡ２、Ｂ２、Ｄ２における缶軸方向上端部Ｂ１、Ｂ２を、該上端部Ｂ１、Ｂ２を除く前記胴部の形成予定部Ａ１、Ｂ１、Ｄ１、およびＡ２、Ｂ２、Ｄ２における缶軸方向上部Ａ１、Ａ２の厚さより厚くしておくので、最後のしごき加工において、前記上端部Ｂ２の肉を開口部Ｃ３に容易に流動させることが可能になる。従って、前記最後のしごき加工のしごき率を４０％以下としても、開口部Ｃ３を全周に亙って均一にしごくことが可能になるとともに、その肉厚を全周に亙って均一にすることが可能になる。さらに、しごき率を４０％以下としていることから、胴切れが発生することを確実に抑制することができる。   As described above, according to the method for manufacturing a DI can according to the present embodiment, when the bottom canister W is subjected to the final ironing process by the end die 14 to form the DI can, the body portion is formed in advance. The formation planned portions A1, B1, D1, and A2 of the barrel portion excluding the upper end portions B1, B2 are formed in the can axis direction upper end portions B1, B2 of the formation planned portions A1, B1, D1, and A2, B2, D2. , B2 and D2 are made thicker than the thicknesses of the upper portions A1 and A2 in the can axis direction, so that the meat of the upper end B2 can easily flow into the opening C3 in the final ironing process. Therefore, even if the ironing rate of the last ironing process is 40% or less, the opening C3 can be uniformly ironed over the entire circumference, and the wall thickness thereof can be made uniform over the entire circumference. It becomes possible. Furthermore, since the ironing rate is set to 40% or less, it is possible to reliably suppress the occurrence of torsion.

また、本実施形態によるＤＩ缶の製造装置によれば、パンチ１１の外表面に、前記上端部Ｂ１、Ｂ２と対応する位置に、その全周に亙って径方向内側へ凹む凹部２２が形成されているので、このパンチ１１を前進させて有底筒状体Ｗをしごく過程で前記上端部Ｂ１、Ｂ２を厚肉に形成することが可能になり、前記作用効果を有するＤＩ缶の製造方法を高効率に実現することができる。   Further, according to the DI can manufacturing apparatus according to the present embodiment, the concave portion 22 is formed on the outer surface of the punch 11 at a position corresponding to the upper end portions B1 and B2 and recessed radially inward over the entire circumference. Therefore, it is possible to form the upper ends B1 and B2 thickly in the course of squeezing the bottomed cylindrical body W by moving the punch 11 forward, and a method of manufacturing a DI can having the above-described effects Can be realized with high efficiency.

特に、本実施形態では、しごきダイスとして、ファーストダイス１２、ミドルダイス１３、およびエンドダイス１４の３つ備え、有底筒状体Ｗに３回のしごき加工が施されるようになっているので、ファーストダイス１２により形成された前記上端部Ｂ１が、ミドルダイス１３によりしごかれ、この上端部Ｂ１の肉が前記開口部形成予定部Ｃ１へ流動させられて、前記上端部Ｂ２および前記開口部形成予定部Ｃ２が形成された後に、この有底筒状体Ｗがエンドダイス１４によりしごかれ、ＤＩ缶が形成されることになる。つまり、エンドダイス１４によりＤＩ缶が形成される前に少なくとも一回、厚肉とされた前記上端部Ｂ１がしごかれることになる。従って、前記上端部Ｂ１、Ｂ２に過負荷を作用させることなく、この上端部Ｂ１、Ｂ２における肉を前記開口部等Ｃ２、Ｃ３に良好に流動させることが可能になり、胴切れを発生させることなく、ＤＩ缶の開口部Ｃ３の肉厚をその全周に亙って均一にすることができるとともに、肉欠けが発生することを抑制することができる。   In particular, in the present embodiment, there are three first dies 12, middle dies 13 and end dies 14 as ironing dies, and the bottomed cylindrical body W is subjected to ironing three times. The upper end B1 formed by the first die 12 is squeezed by the middle die 13, and the meat of the upper end B1 is caused to flow to the opening forming portion C1, and the upper end B2 and the opening After the formation planned portion C2 is formed, the bottomed cylindrical body W is ironed by the end die 14, and a DI can is formed. That is, the thickened upper end B1 is squeezed at least once before the DI can is formed by the end die 14. Therefore, it becomes possible to flow the meat in the upper ends B1 and B2 to the openings C2 and C3 and the like without causing an overload to the upper ends B1 and B2, thereby causing a torn piece. In addition, the thickness of the opening portion C3 of the DI can can be made uniform over the entire circumference, and the occurrence of chipping can be suppressed.

また、本発明のボトル缶および缶基体によれば、ＤＩ缶において、前記胴部の缶軸方向上端部Ｂ３は、該上端部Ｂ３を除く前記胴部の缶軸方向上部Ａ３における肉厚より厚くされているので、この部分Ｂ３に外力が作用することによって、凹み等の変形が発生することを抑制することができる。ところで、ボトル缶の場合、その外表面のうち、前記上端部Ｂ３が径方向外方へ最も突出した部分の一部を構成しているとともに、厚肉の肩部と隣接しているので、この部分は特に凹みが発生し易いため、前述した変形の発生抑制効果が特に著しく奏されることになる。また、前記ＤＩ缶に基づいてボトル缶を形成する場合においては、強度上の理由により、一般にＤＩ缶の開口部Ｃ３のうち最も肉厚の大きい部分の肉厚を、胴部のうち最も肉厚の小さい部分、つまり胴部の缶軸方向上部のうち上端部Ｂ３を除く部分Ａ３の肉厚より８０μｍ以上大きくする必要があり、このようなＤＩ缶を形成するには、従来では必然的に最後のしごき加工のしごき率を大きくせざるを得なかったため、前述した、前記最後のしごき加工のしごき率を４０％以下としても、前記開口部を全周に亙って均一にしごくことが可能になるとともに、その肉厚を全周に亙って均一にすることが可能になるといった作用効果が特に著しく奏されることになる。   Further, according to the bottle can and the can base of the present invention, in the DI can, the can axis direction upper end portion B3 of the trunk portion is thicker than the wall thickness in the can axis direction upper portion A3 of the trunk portion excluding the upper end portion B3. Therefore, it is possible to suppress the occurrence of deformation such as a dent when an external force acts on the portion B3. By the way, in the case of a bottle can, the upper end portion B3 of the outer surface constitutes a part of a portion that protrudes most outward in the radial direction and is adjacent to a thick shoulder portion. Since the portion is particularly prone to dents, the above-described deformation suppression effect is particularly remarkable. In the case of forming a bottle can based on the DI can, for the reasons of strength, generally the thickness of the thickest portion of the opening C3 of the DI can is set to be the thickest of the barrel portions. In other words, in order to form such a DI can, it is inevitably the last step in the prior art. Since the ironing rate of the ironing process was inevitably increased, even if the ironing rate of the last ironing process is 40% or less, the opening can be uniformly ironed over the entire circumference. In addition, the effect of making the thickness uniform over the entire circumference is particularly remarkable.

さらに、このボトル缶は、ＤＩ缶の開口部Ｃ３に少なくとも１５回ネックイン加工されるので、肩部と胴部との肉厚の差が特に大きくなるため、ボトル缶に缶軸方向下方に向けた力、すなわち圧縮力が作用した場合、前記胴部Ａ４、Ｂ４、Ｄ４の缶軸方向上端部Ｂ４に応力が集中し易く、座屈強度が低下する虞があるが、この部分Ｂ４は胴部の缶軸方向上部の中で最も厚肉とされているので、この座屈強度の低下を最小限に抑制することができる。   Furthermore, since this bottle can is neck-in processed at least 15 times in the opening C3 of the DI can, the difference in thickness between the shoulder and the trunk becomes particularly large. When a strong force, that is, a compressive force is applied, stress is likely to concentrate on the upper end portion B4 in the can axis direction of the body portions A4, B4, D4, and the buckling strength may be reduced. Since the thickness is the thickest in the upper part of the can axis direction, this reduction in buckling strength can be minimized.

ＤＩ缶を製造するに際して、この開口部をその全周に亙って均一にしごき、この部分における肉厚を全周に亙って均一にすること、および胴切れが発生するのを抑制することの双方を実現することができる。また、ボトル缶および缶基体の胴部における缶軸方向上端部に外力が作用することにより、この部分が凹む等の変形することを抑制することができる。   When manufacturing a DI can, this opening is uniformly ironed over the entire circumference, the wall thickness in this part is made uniform over the whole circumference, and the occurrence of a torsion is suppressed. Both of these can be realized. Further, when an external force acts on the upper end portion in the can axis direction of the body portion of the bottle can and the can base body, it is possible to suppress deformation such as a depression of this portion.

本発明に係る一実施形態において、ＤＩ缶の製造装置のパンチ部の一部拡大断面図である。In one Embodiment which concerns on this invention, it is a partially expanded sectional view of the punch part of the manufacturing apparatus of DI can. 本発明に係る一実施形態において、ＤＩ缶の製造装置を示す概略構成図である。In one Embodiment which concerns on this invention, it is a schematic block diagram which shows the manufacturing apparatus of DI can. 図２に示す再絞りダイスより再絞り加工が施されたときの有底筒状体Ｗの肉厚分布である。It is the thickness distribution of the bottomed cylindrical body W when a redrawing process is given from the redrawing die shown in FIG. 図２に示すファーストダイスによりしごき加工が施されたときの有底筒状体Ｗの肉厚分布である。It is the thickness distribution of the bottomed cylindrical body W when ironing is performed by the first die shown in FIG. 図２に示すによりミドルダイスによりしごき加工が施されたときの有底筒状体Ｗの肉厚分布である。FIG. 2 shows the wall thickness distribution of the bottomed tubular body W when ironing is performed with a middle die as shown in FIG. 図２に示すによりエンドダイスによりしごき加工が施されて形成されたＤＩ缶の肉厚分布である。FIG. 2 is a thickness distribution of a DI can formed by ironing by an end die as shown in FIG. 図１および図２に示すＤＩ缶の製造装置により形成されたＤＩ缶に基づいて形成されたボトル缶の肉厚分布のグラフである。It is a graph of the wall thickness distribution of the bottle can formed based on the DI can formed by the DI can manufacturing apparatus shown in FIG. 1 and FIG. 図７に示すボトル缶の肉厚分布のグラフのデータを示す図である。It is a figure which shows the data of the graph of the thickness distribution of the bottle can shown in FIG.

符号の説明Explanation of symbols

１０ ＤＩ缶の製造装置
１１ パンチ
１２〜１４ しごきダイス
２２ 凹部
Ａ１、Ａ２ 上端部を除く胴部の形成予定部における缶軸方向上部
Ａ３ 上端部を除くＤＩ缶の胴部における缶軸方向上部
Ａ４ 上端部を除くボトル缶の胴部における缶軸方向上部
Ｂ１、Ｂ２ 胴部の形成予定部における缶軸方向上端部
Ｂ３ ＤＩ缶の胴部における缶軸方向上端部
Ｂ４ ボトル缶の胴部における缶軸方向上端部
Ｃ３ ＤＩ缶の開口部
Ｏ 軸線
Ｗ 有底筒状体 10 DI can manufacturing equipment
11 Punch
12-14 Shigeki Dice
22 recess
A1, A2 Can axis direction upper part in the formation planned part of the body part excluding the upper end part
A3 Can axial direction upper part of DI can body except upper end
A4 Can axially upper part of the body of the bottle can excluding the upper end
B1, B2 Can shaft direction upper end part in the formation planned part of the body part
B3 Upper end of the can of the DI can
B4 Can axial direction upper end in the body of the bottle can
C3 DI can opening
O axis
W Bottomed cylindrical body

Claims (6)

金属製の有底筒状体にしごき加工を複数回施して、開口部と、該開口部の缶軸方向下端に連設され缶軸方向下方に延びる胴部とを備え、該胴部の缶軸方向上部は前記開口部より薄肉とされたＤＩ缶を製造するＤＩ缶の製造方法であって、
前記有底筒状体に最後のしごき加工を施して前記ＤＩ缶を形成する際に予め、前記有底筒状体において、前記胴部の形成予定部における缶軸方向上端部を、該上端部を除く前記胴部の形成予定部における缶軸方向上部の厚さより厚くしておき、その後しごき率４０％以下で前記最後のしごき加工を施すことを特徴とするＤＩ缶の製造方法。 The bottomed cylindrical body made of metal is subjected to ironing a plurality of times, and includes an opening, and a body portion that is provided at the lower end of the opening in the can axis direction and extends downward in the can axis direction. The axially upper part is a DI can manufacturing method for manufacturing a DI can that is thinner than the opening,
When forming the DI can by subjecting the bottomed cylindrical body to the final ironing process, in the bottomed cylindrical body, the upper end portion in the can axis direction in the portion where the body portion is to be formed is A method of manufacturing a DI can characterized in that it is made thicker than the thickness of the upper portion in the can axis direction in the portion where the body portion is to be formed, and the final ironing is performed at a ironing rate of 40% or less. 請求項１記載のＤＩ缶の製造方法において、
前記有底筒状体に少なくとも３回しごき加工を施して前記ＤＩ缶を形成することを特徴とするＤＩ缶の製造方法。 In the manufacturing method of DI can of Claim 1,
A DI can manufacturing method, wherein the DI can is formed by ironing the bottomed cylindrical body at least three times. 軸線方向に進退可能に支持されたパンチと、該パンチと同軸上に配設された複数のリング状のしごきダイスとを備え、前記パンチが金属製の有底筒状体の内部に挿入されて軸線方向に前進することにより、前記有底筒状体の外表面を前記複数のしごきダイスの内表面により順次しごいて、開口部と、該開口部の缶軸方向下端に連設され缶軸方向下方に延びる胴部とを備え、該胴部の缶軸方向上部は前記開口部より薄肉とされたＤＩ缶を製造するＤＩ缶の製造装置であって、
前記パンチの外表面には、前記有底筒状体の、前記胴部の形成予定部における缶軸方向上端部と対応する位置に、その全周に亙って径方向内側へ凹む凹部が形成されていることを特徴とするＤＩ缶の製造装置。 A punch supported to be movable back and forth in the axial direction, and a plurality of ring-shaped squeezing dies arranged coaxially with the punch, the punch being inserted into a metal bottomed cylindrical body By moving forward in the axial direction, the outer surface of the bottomed cylindrical body is sequentially squeezed by the inner surfaces of the plurality of squeezing dies, and the can shaft is connected to the opening and the lower end in the can axis direction of the opening. A can that extends downward in the direction, and the upper part of the barrel in the axial direction of the can is a DI can manufacturing apparatus that manufactures a DI can that is thinner than the opening,
On the outer surface of the punch, a concave portion that is recessed radially inward over the entire circumference is formed at a position corresponding to the upper end portion in the can axis direction of the bottom portion of the cylindrical body. An apparatus for manufacturing DI cans, characterized in that 大径の胴部と、該胴部の缶軸方向上端に連設されるとともに缶軸方向上方へ向かうに従い漸次縮径した肩部と、該肩部の缶軸方向上端に連設されるとともに缶軸方向上方へ延在した口金部とを備えるボトル缶であって、
請求項１または２に記載の製造方法により製造されたＤＩ缶に基づいて製造され、前記胴部の缶軸方向上端部は、該上端部を除く前記胴部の缶軸方向上部における肉厚より厚くされていることを特徴とするボトル缶。 A large-diameter trunk, a shoulder that is connected to the upper end of the barrel in the can axis direction, and that is gradually reduced in diameter as it goes upward in the can axis, and is connected to the upper end of the shoulder in the can axis direction A bottle can comprising a base portion extending upward in the can axis direction,
It manufactures based on DI can manufactured by the manufacturing method of Claim 1 or 2, and the can axial direction upper end part of the trunk part is the thickness in the can axial direction upper part of the trunk part except the upper end part. A bottle can characterized by being thickened. 請求項４記載のボトル缶において、
前記肩部および前記口金部は、前記ＤＩ缶の前記開口部に少なくとも１５回のネックイン加工が施されて形成されることを特徴とするボトル缶。 The bottle can according to claim 4,
The bottle can characterized in that the shoulder portion and the base portion are formed by performing at least 15 neck-in processing on the opening of the DI can. 大径の胴部と、該胴部の缶軸方向上端に連設されるとともに缶軸方向上方へ向かうに従い漸次縮径した肩部と、該肩部の缶軸方向上端に連設されるとともに径方向外方へ折り曲げられたフランジ部とを備え、該フランジ部に缶蓋が巻き締められる構成とされた缶基体であって、
請求項１または２に記載の製造方法により製造されたＤＩ缶に基づいて製造され、前記胴部の缶軸方向上端部は、該上端部を除く前記胴部の缶軸方向上部における肉厚より厚くされていることを特徴とする缶基体。 A large-diameter trunk, a shoulder that is connected to the upper end of the barrel in the can axis direction, and that is gradually reduced in diameter as it goes upward in the can axis, and is connected to the upper end of the shoulder in the can axis direction A can base having a flange portion bent radially outward, and a can lid wound around the flange portion,
It manufactures based on DI can manufactured by the manufacturing method of Claim 1 or 2, and the can axial direction upper end part of the trunk part is the thickness in the can axial direction upper part of the trunk part except the upper end part. A can base characterized in that it is thickened.
JP2008299869A 2008-11-25 2008-11-25 DI can manufacturing equipment Expired - Lifetime JP5015120B2 (en)

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