JP4359745B2

JP4359745B2 - Method for manufacturing polyhedral container and apparatus for manufacturing the same

Info

Publication number: JP4359745B2
Application number: JP2002189389A
Authority: JP
Inventors: 孝之相川; 公一石坂; 憲司吉弘
Original assignee: Toyo Seikan Kaisha Ltd
Current assignee: Toyo Seikan Kaisha Ltd
Priority date: 2002-06-28
Filing date: 2002-06-28
Publication date: 2009-11-04
Anticipated expiration: 2022-06-28
Also published as: JP2004025286A

Description

【０００１】
【発明の属する技術分野】
本発明は、容器胴部を多面体に成形加工した多面体容器の製造方法及びその製造装置に関する。
【０００２】
【従来の技術】
従来、円筒状容器から胴部を変形させた多面体容器に成形する方法として、外型と中子を相対移動させて両者で挾み込むことにより張出し加工を行う方法（例えば、特開平１１ー２５４０６８号公報）、あるいは予めネッキング加工及びカーリング加工を施して剛性を高めてから、その外側から転動体を金属缶の縦方向に転動させることにより、金属缶の胴部に縦リブ等を施して変形加工を行う方法（特公平２−４３５６６号公報）等が知られている。
【０００３】
【発明が解決しようとする課題】
上記従来技術のうち前者の方法は、中子又は内子を使用するため成形時に、必然的に缶内面に中子又は内子と圧接するので、缶内面に塗布されている塗膜や内層フィルムを損傷させる恐れがある。しかも、成形加工される部分の材料が延伸されるので、缶内外面の塗膜とも損傷を受けやすい欠点がある。また、中子又は内子があると成形装置への容器の挿入、取出を逆方向にしなければならず、連続的に一方向だけのトランスファができないため、単ヘッド当たりのサイクルスピードを上げることができない欠点もある。さらに、後者の場合は、転動体を縦方向に転動させて行うため、縦方向に連続変形する場合に限られ、任意の形状に変形加工することができず、成形の自由度が低いという問題点があった。
【０００４】
そこで、本発明は、容器内外面の塗膜やフィルム面を損傷させる恐れがなく、容器の外側に任意の凹形状を施すことができ、且つ成形が瞬間にでき、形状の自由度が高い多面体容器の製造方法及びその製造装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記問題点を解決する本発明の多面体容器の製造方法は、容器の外側に放射状に配置されている３個以上の分割金型からなる成形金型で、容器胴部のほぼ全周を拘束しながら胴部に内方向の押圧力を加えることにより、容器の外側に配置されている分割金型のみで胴部を変形加工することからなり、前記成形金型は、容器胴部を押圧変形させる変形加工用分割金型と容器胴部の外側への膨出を拘束する拘束用分割金型の組み合わせからなり、容器胴部変形加工中、前記拘束用分割金型で容器胴部が外方に膨出しないように拘束しながら、前記変形加工用分割金型で胴部を内方に押し込んで変形加工することを特徴とする。
【０００６】
前記成形金型は、容器胴部を押圧変形させる複数の変形加工用分割金型の組み合わせ、又は容器胴部を押圧変形させる変形加工用分割金型と容器胴部の外側へ膨出を拘束する拘束用分割金型の組み合わせで構成することができ、前者の場合は、変形加工中、複数の変形加工用分割金型全体で容器胴部が外方に膨出しないように拘束しながら、胴部を内方に押し込むことにより、胴部周長を略等長変形させて変形加工する。また、後者の場合は、容器胴部変形加工中、拘束用分割金型で容器胴部が外方に膨出しないように拘束しながら、変形加工用分割金型で胴部を内方に押し込んで変形加工する。前記分割金型を、トグル機構により容器の外側から内側に向かう倍力された力で容器胴部の略全周を締め付けながら変形加工することによって、少ない動力でより確実に等長変形加工を行うことができる。
【０００７】
また、本発明の多面体容器の製造装置は、容器外方を囲うように放射状に配置された３個以上の分割金型からなる成形金型、前記成形金型を容器内方に変位させて容器胴部に押圧力を付与する分割金型変位機構からなり、前記３個以上の分割金型は、容器胴部に押圧力を加える際に該分割金型が容器胴部のほぼ全周を拘束しながら胴部に内方向の押圧力を加えるように配置されてなり、前記成形金型は、容器胴部を押圧変形させる変形加工用分割金型と前記容器胴部の外側への膨出を拘束する拘束用分割金型の組み合わせからなることを特徴とする。
【０００８】
前記各分割金型は、トグル機構又はカム機構により容器の外側から内側に向かって変位駆動されるように構成されている。前記成形金型は、成形加工形状に応じて、容器胴部を押圧変形させる変形加工用分割金型からなる分割金型のみの組み合わせ、又は該容器胴部を押圧変形させる変形加工用分割金型と容器胴部の外側へ膨出を拘束する拘束用分割金型からなる分割金型の組合わせで構成する。
【０００９】
そして、前記分割金型は、トグル機構又はカム機構により容器の外側から内側に向かって変位駆動される出力レバーに、着脱自在に装着されているのが望ましい。その場合、前記出力レバーは、前記分割金型が嵌合できる分割金型嵌合溝を有し、且つ該嵌合溝に嵌合した前記分割金型を係脱可能に係止する係止手段を有するように構成する。また、分割金型は、前記出力レバーに着脱自在に装置する装着部と、成形面を有する型部とで構成する。さらに、前記装着部は、前記出力レバーの分割金型嵌合溝に嵌合する板状からなり、その上端部及び下端部に前記出力レバーの係止手段に係止する係止部が形成されている。
【００１０】
【発明の実施の形態】
以下、本発明の実施形態を図面を基に詳細に説明する。
図１〜図３は、本発明に係る多面体容器製造装置の一実施形態を示し、図１はその成形加工する要部の縦断面を示し、図２及び図３はその平面図であり、図２は成形加工開始前の状態、図３は成形加工終了時点の状態を示している。
本実施形態の多面体容器製造装置では、図４に示すように円筒胴部の開口部に目金蓋５３を巻締してあるエアゾール缶等の缶体５０の胴部５１を均等な平坦辺５２からなる１２面体胴部に成形加工する場合を示しており、加工する容器の胴部が中心部に位置できる円筒空間の外周に位置するように放射状に配置された１２個の分割金型３からなる成形金型２を有している。分割金型３は、本実施形態では均等な１２面体を形成するので、すべてが変形加工用金型で構成され、容器に変形させる力が加えられる際に力が逃げないように、その両側端縁同士が互いに接近して成形加工部のほぼ全周をホールドできるように配置されている。それにより、成形加工の際に部分的な延伸が殆ど生じることがなく、缶胴の等長変化による成形加工を可能にし、中子がなくても缶胴の変形加工ができる特徴を有している。
【００１１】
各成形金型２は、本実施形態では図１に示すように、トグル機構によって、放射方向に変位するようになって構成されている。図１において、５が固定レバー、６が入力レバー、７が出力レバーであり、固定レバー５と入力レバー６間をリンク８−１、８−２で、入力レバー６と出力レバー７間をリンク９−１、９−２で平行四辺形運動可能に連結することによってトグル機構を構成している。各入力レバー６は、その上端部が上方に延び、固定部に設けられている図示しないシリンダやモータ等の駆動手段に連結されて一斉に上下動されるようになっており、それにより各出力レバー７が一斉に放射方向に変位する。出力レバーの下端には固定台部に沿ってスムーズに往復動できるように、適宜のガイドローラ１９を設けてある。出力レバー７に後述するように分割金型３が着脱自在に固定されている。なお、共通する単一の駆動装置によって各トグル機構を一斉に駆動するように構成するほか、各トグル機構毎にあるいはグループ毎に別々の駆動手段を設けても良い。その場合は、成形加工形状に応じて、各分割金型のストローク量やタイミングを個別又はグループ毎に制御できるので、より変化に富んだ成形が可能となる。
【００１２】
分割金型３は、後述するように成形する胴部形状に応じて任意の形状のものが採用でき、本実施形態では、これらの金型が出力レバーに着脱自在に取付け可能で、出力レバー７が分割金型チャックを構成しており、分割金型を取り替えるだけで一台の装置で種々の形状の缶胴を成形できるようになっている。図５及び図６に分割金型チャックを構成する出力レバーの一実施形態が示され、図７に該出力レバーに着脱可能に構成されている分割金型の一実施形態が示され、図８に出力レバーに分割金型が固定されている状態が示されている。
【００１３】
本実施形態の出力レバー７は、分割金型をワンタッチで着脱できるように構成されていることを特徴とし、図５〜８に示すように、缶胴軸方向に延びる長方形板状を呈し、入力レバー側に面する背面側には、リンク９−１、９−２が揺動可能に嵌合する長溝状のリンク連結孔１１−１、１１−２が穿設され、且つ該リンク連結孔に直交する軸孔１２−１、１２−２が穿設されて、リンク連結孔に嵌合されたリンク９−１、９−２に回動自在に軸止できるようになっている。また、成形する缶胴と面する側の前面側には、図７に示す分割金型３の板状の装着部２０が嵌合する分割金型嵌合溝１３が軸方向に貫通して形成されている。該嵌合溝の下端部側には、分割金型の下端部に形成された係止凹部が嵌合係止する係止ピン１４が嵌合溝を横断して設けられ、上端部側には分割金型の上端部背面係止部と係合する係合ピン１５が設けられている。また、出力レバーの上端部には、嵌合溝に嵌合された分割金型の装着部２０の上端部に突出形成された係合突起部２５を前記係合ピン１５との間で係止するための揺動係止片１６が揺動自在に設けられている。揺動係止片１６は、図示のように、略コ字状を呈し、その両後端部が分割金型の側部に揺動自在に軸着され、その前端連結部が分割金型係止部１７となっており、出力レバーの上端面から上方に揺動可能となっており、上端面に載った状態で、嵌合溝に嵌合された分割金型の係合突起部２５を前記係合ピンと分割金型係止部の後端面１８で挟んで固定するようになっている。
【００１４】
一方、上記出力レバーに着脱自在に取付け可能に構成されている分割金型３は、図７に示す構成となっている。分割金型３は、装着部２０と成形型部２１とから構成され、成形型部２１は成形する形に応じて相違しているが、装着部２０は各分割金型とも同様な構成となっている。即ち、装着部２０の下端部には、出力レバーの係止ピン１４と係止する係止凹部２２が形成されているが、該係止凹部２２は出力レバーに係止しやすいように、該係止凹部の差込み方向の後縁側壁部２３を前縁側壁部２４より長く、且つ先端部先細状に形成することによって、後端部が分割金型嵌合溝１３の底壁と係止ピン１４との間に嵌合し易くしてある。また、装着部２０の上端部には、奥行き方向途中に係合突起部２５が突出形成されている。該係合突起部２５は、装着部２０を分割金型係合溝１３に嵌合した際に、装着部２０上部を出力レバー７に係止する役割を果たすためのものであり、その後側端縁部２６が出力レバー７に設けられた係合ピン１５に係合し、前側端縁部２７が揺動係止片１６の分割金型係止部１７の後端面１８と係合するようになっている。該係合突起部２５の前側端縁部２７は、揺動係止片１６が揺動して押し下げられる際に、分割金型係止部１７の後端縁１８が係合しながら押し込むことができるように、円弧状に形成されている。そして、後側端縁部２６は出力レバー７に設けられた係合ピン１５に係合できるように、前側上端縁２７より一段と深く形成されている。
【００１５】
本実施形態の出力レバー７及び分割金型３は、以上のように構成され、出力レバー７への分割金型３の取付けは、まず分割金型３の下端部を斜め状態にしてその係止凹部２２の後縁側壁部２３を係止ピン１４と分割金型嵌合溝１３の底壁間に差込むことによって、係止凹部２２を係止ピン１４に係止させる。次いで、揺動係止片を起した状態で分割金型の上端部を後側端縁部２６が係合ピン１５と係合するまで押し込み、その状態で揺動係止片を押し戻すことによって、揺動係止片の後端面が係合突起部の前側端縁部２７に係合又は押圧して、装着部２０の上部を嵌合溝に係止する。以上のようにして、特別の工具等を必要とすることなく、ワンタッチで出力レバー７への分割金型３の取付けることができ、分割金型の型替えを熟練を要することなく簡単に且つ正確に行うことができる。
【００１６】
本実施形態の多面体容器製造装置は、以上のように構成され、図１及び図２に示すように、分割金型３をセットした出力レバー７が後退している状態で缶体５０を分割金型群で囲む円筒状空間部に適宜の供給装置で供給し、この位置で図示しない駆動手段が駆動して入力レバー６を押し下げ駆動することによって、出力レバー７が缶胴中心方向に放射状に移動して、分割金型の成形型部の型面を缶胴に倍力機構により増大された強い力で押し込む。その際、分割金型の平坦な成形型面２９が缶胴の略全周を締め付けた状態で押圧するので、材料の逃げによる延伸がなく略等長のまま変形し、ワンストロークで瞬間的に正確に１２面体形状に形成することができる。従って、缶内外面の塗膜にダメージを与えることなく成形することができる。そして、成形終了後は入力レバー６が上昇し、分割金型３が元の位置に復帰して缶胴を開放すると、缶体５０を下降させて成形金型の位置を通過させ、次工程に送る。なお、本発明の多面体容器の製造方法により成形加工できる容器はその形状や用途が限定されるものではないが、その成形加工は、容器の開口端面の剛性を高めた状態、即ちネッキング加工やフランジ加工工程以後で行うのが好ましい。
【００１７】
上記実施形態では、缶胴を正１２面体に成形した場合の例であるが、次に、例えば、図１０に示すように、部分的に元の缶胴外径部分を残しながら、部分的に内方に窪ませた多面体容器を製造する場合の実施形態について説明する。図１０に示す実施形態の缶体５５では、胴部５６に内方に窪む比較的大きい円弧状縦溝５７を等ピッチで６個形成した場合であり、縦溝間壁５８はほぼ元の缶体の胴部壁の形状を維持している。
【００１８】
上記缶体を成形する場合、前記実施形態の装置において、単に分割金型のみを交換することによって容易に実施することができる。図９はその場合の多面体容器製造装置の実施形態を示している。図９において、３５が固定レバー、３６が入力レバー、３７が出力レバー、３８、３９がリンクであり、前記実施形態と同様にトグル機構により出力レバーが放射方向に変位駆動される。分割金型は、本実施形態では、円弧状縦溝５７を形成するための変形加工用分割金型４０と、缶胴の縦溝間壁５８に相当する部分を成形加工中拘束する拘束用分割金型４１の２種類から構成され、これらの分割金型が図９（ａ）に示すように、交互に出力レバー３７に装着されている。
【００１９】
図９に示す実施形態において、缶体の成形は、トグル機構により、各出力レバーが所定のストロークで缶体中心方向に向かって変位することによって、変形加工用分割金型４０が胴部を内方に押し込んで円弧状縦溝５７を成形する。その間、拘束用分割金型４１は、図９（ｂ）に示すように、その型面が缶胴外径位置で縦溝間壁５８の変形を拘束する。その結果、変形加工用分割金型４０で押圧されている缶胴部分だけ内側に変形して円弧状縦溝５７が形成され、図１０（ｂ）に示す断面形状の缶体に成形加工することができる。
【００２０】
本発明の多面体容器製造装置によれば、上記の形状に限らず、種々の形状の容器を成形することができ、それに対応する種々の形態の分割金型を選択することができる。図１２は図１０に示す缶体における円弧状縦溝に代えて縦溝の底部が直線的に屈曲している縦溝形状を有しているものに相当する他の実施形態に係る缶体６０を示している。この場合は、缶胴６１の軸方向に縦溝間壁６４を介して形成された６個の縦溝６２は、溝底が中央部６３で軸線に沿って直線的に屈曲して先鋭状になっている。このような溝底部が中央部で屈曲している縦溝加工、特に深溝加工を行う場合の変形加工用分割金型は、必ずしも加工する長溝全長に亘る同一形状の型面を有してなくも可能である。
【００２１】
図１１は、図１２に示す缶胴を成形する場合の変形加工用分割金型４２を示している。この場合の成形型面２９は、その断面を同図（ｂ）に示すように、中央部の所定区間だけ三角屋根状に最突出先鋭部４３となっており、その両端がその上下端に向かって傾斜した稜線４４となっている。
【００２２】
このような形状の分割金型での缶体の成形加工は、前記実施形態で説明したように、缶胴全周が変形加工用分割金型４２及び拘束用分割金型によりホールドされている形で行うために、変形加工用分割金型４２の最突出先鋭部４３が缶胴に当たるとその押し込み作用により、缶胴の変形が最突出先鋭部４３を起点としてその両端の稜線４４に沿って自動的に進行し、分割金型の凸状となっている成形面形状よりも鋭く、長く、且つ深い溝を形成することができる。なお、型面が先鋭凸状になっていても押し込み量が少なければ、型面形状に沿って成形される。従って、このような成形原理を利用することによって、複雑な成形型面によらず、変化に富んだ形状の成形加工ができる。
【００２３】
図１３は、本発明の他の実施形態に係る多面体容器製造装置の概略図であり、本実施形態では、前記実施形態と比較して、成形金型の駆動を前記実施形態のトグル機構に代えてカム機構を採用した点で相違している。前記実施形態と同様な部材には同様な符号を付し、相違点のみ説明する。本実施形態では、入力レバー４４を固定レバー５に対して適宜のリニアガイド４６で軸方向に変位可能に設け、且つ該入力レバー４４の出力レバーに面する側にはカム面４５を形成してある。一方、出力レバー４７には前記カム面と係合するカムフォロワ４８を設け、入力レバー４４を図示しない適宜のアクチュエータで上下駆動することによって、缶体の内方向に変位し、缶胴面を押込み所定形状に成形する。なお、出力レバー４７は缶体の内方向に直線的に変位可能に図示しない適宜のガイドにより案内され、カムフォロワ４８が常にカム面４５と係合するように、引っ張りバネ４９等の適宜の付勢手段で付勢されている。
【００２４】
以上、本発明の種々の実施形態について説明したが、本発明の多面体容器製造装置は前記実施形態に限るものでなく、その技術的思想の範囲内で種々の設計変更が可能である。また、成形する容器の形状も限定されるものでなく、断面形状が三角形、四角形、六角形、八角形、十二角形等任意の多面体、あるいは例えば軸方向上下に断面形状が相違するように成形すること、部分的に凹部を設ける等任意の加工が可能である。また、容器の全体形状も、上下が円筒缶、上下が多面体缶、ボトル形状金属缶、スプレー缶、飲料缶、あるいは広口容器、狭口容器等種々の形状の容器の成形加工に適用できる。例えば、図１４は、開口端にネッキング加工及びカーリング加工工程を経た缶体６６に正１２面体加工を施した場合を示し、図１５にボトル形状の缶体６８に縦溝中央部６９が直線状に屈曲している縦溝７０を連続的に形成した場合を示している。
【００２５】
【発明の効果】
以上のように本発明によれば、容器の外側に配置されている複数の分割金型からなる成形金型で、容器胴部のほぼ全周を拘束しながら胴部に内方向の押圧力を加えるので、成形面の材料の延伸が防止されて略等長変形で成形することができ、容器の内外面の塗膜を損傷させることがなく、高品質の多面体容器を得ることができる。特に、容器の外側に配置されている分割金型のみで胴部を変形加工することができ、容器内面に中子や型を設ける必要がないので、内容物と直接接触する容器内面の塗膜や内面層を損傷させることがない。成形された容器は、元の胴外径よりも外側に膨出することが殆どなく、あってもごく僅かな量であるので、搬送上も傷が付きにくい多面体容器を得ることができる。
【００２６】
そして、本発明の多面体容器の製造装置及び製造装置によれば、容器口の広狭に制限を受けることなく、しかも瞬間的に複雑な形状の加工ができるので、容器の差別化を図ることができる。また、先鋭状型面を有する変形加工用分割金型で深溝加工をする場合、容器の変形が先鋭状型面により押圧される位置から進行して該変形加工用分割金型の先端形状よりも鋭く深い溝加工が、ワンストロークでできる。
【００２７】
さらに、分割金型をトグル機構又はカム機構により容器の外側から内側に向かって変位駆動される出力レバーに、ワンタッチで係脱可能に係止する係止手段を設けることにより、１台の装置で容器形状に応じて分割金型を交換するのみで多種類の形状の容器を得ることができ、しかも分割金型の型替えを特別の工具を必要とすることなく、熟練も要することなく、簡単に且つ正確に行うことができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る多面体容器製造装置の正面概略図である。
【図２】その成形金型の成形加工開始前の配置状態を示す平面図である。
【図３】その成形金型の成形加工終了時点の配置状態を示す平面図である。
【図４】本発明の多面体容器製造方法で製造した容器の一形態を示し、（ａ）は正面図、（ｂ）はそのＡ−Ａ断面図である。
【図５】本発明の多面体容器製造装置における出力レバー（分割金型チャック）の実施形態を示す斜視図である。
【図６】（ａ）は図５に示す出力レバーの背面図、（ｂ）その正面図である。
【図７】本発明の多面体容器製造装置における分割金型の一実施形態を示し、（ａ）はその斜視図、（ｂ）はそのＢ−Ｂ断面図である。
【図８】図７に示す分割金型を装着した状態での図６に示す出力レバー正面縦断面図である。
【図９】（ａ）は本発明の他の実施形態に係る多面体容器製造装置における成形金型の成形加工開始前の配置状態を示す平面図、（ｂ）はその成形加工終了時点の配置状態を示す平面模式図である。
【図１０】本発明の多面体容器製造方法で製造した容器の他の形態を示し、（ａ）は正面図、（ｂ）はそのＣ−Ｃ断面図である。
【図１１】本発明の多面体容器製造装置における分割金型の他の実施形態を示し、（ａ）はその斜視図、（ｂ）はそのＤ−Ｄ断面図である。
【図１２】本発明の多面体容器製造方法で製造した容器の他の形態を示し、（ａ）は正面図、（ｂ）はそのＥ−Ｅ断面図である。
【図１３】本発明の他の実施形態に係る多面体容器製造装置の正面概略図である。
【図１４】本発明の多面体容器製造方法で製造した容器のさらに他の実施形態を示し、（ａ）は正面図、（ｂ）はそのＦ−Ｆ断面図である。
【図１５】本発明の多面体容器製造方法で製造した容器のさらに他の実施形態を示し、（ａ）は正面図、（ｂ）はそのＧ−Ｇ断面図である。
【符号の説明】
１多面体容器製造装置２成形金型
３、４２分割金型５、３５固定レバー
６、３６、４４入力レバー７、３７、４７出力レバー
８−１、８−２、９−１、９−２、３８、３９リンク
１１−１、１１−２リンク連結孔
１３分割金型嵌合溝１４係止ピン
１６揺動係止片１７分割金型係止部
２０装着部２１成形型部
２２係止凹部２５係合突起部
２９成形型面４０変形加工用分割金型
４１拘束用分割金型４５カム面
４８カムフォロワ５７、６２縦溝
６０缶体６１缶胴[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a polyhedral container in which a container body is molded into a polyhedron, and a manufacturing apparatus therefor.
[0002]
[Prior art]
Conventionally, as a method for forming a cylindrical body from a cylindrical container into a deformed polyhedron container, a method in which an outer mold and a core are relatively moved and squeezed by both is performed (for example, Japanese Patent Laid-Open No. 11-254068). No.), or by applying necking and curling in advance to increase rigidity, and rolling the rolling element from the outside in the vertical direction of the metal can, thereby applying vertical ribs or the like to the body of the metal can A method of performing deformation processing (Japanese Patent Publication No. 2-43566) is known.
[0003]
[Problems to be solved by the invention]
Among the above prior arts, the former method uses a core or an inner core and inevitably presses the core or inner core on the inner surface of the can at the time of molding, so that the coating film or inner layer film applied to the inner surface of the can is damaged. There is a fear. In addition, since the material of the part to be molded is stretched, there is a drawback that the coating film on the inner and outer surfaces of the can is easily damaged. In addition, if there is a core or core, the container must be inserted and removed from the molding device in the reverse direction, and continuous transfer in only one direction is not possible, so the cycle speed per single head cannot be increased. There are also drawbacks. Furthermore, in the latter case, since the rolling element is rolled in the vertical direction, it is limited to the case of continuous deformation in the vertical direction, it cannot be deformed into an arbitrary shape, and the degree of freedom of molding is low. There was a problem.
[0004]
Therefore, the present invention has no risk of damaging the coating film and film surface on the inner and outer surfaces of the container, can form any concave shape on the outside of the container, can be molded instantly, and has a high degree of freedom in shape. It aims at providing the manufacturing method and its manufacturing apparatus of a container.
[0005]
[Means for Solving the Problems]
The method for manufacturing a polyhedral container of the present invention that solves the above-mentioned problems is a molding die composed of three or more divided molds arranged radially on the outside of the container, and restrains almost the entire circumference of the container body. However, by applying an inward pressing force to the body part, the body part is deformed only with the split molds arranged outside the container, and the molding die presses and deforms the container body part. deformation becomes bulging outward of the working split molds and the container body from a combination of constraining split mold for restraining, in container body deforming, the container body by constraining split mold outwardly while restrained from bulging, characterized by deforming Nde push the barrel inward by the deformation processing split molds.
[0006]
The molding die constrains bulging to the outside of a combination of a plurality of deforming split molds that press deform the container body, or a deforming split mold that presses and deforms the container body and the container body. The former can be configured by a combination of constraining split molds, and in the former case, while deforming, the entire body of the deforming split molds is restrained so as not to bulge outward while By pushing the part inward, the circumference of the body part is deformed by approximately equal length. In the latter case, during deformation of the container body, the body is pushed inward by the deformation dividing mold while restraining the container body from bulging outward by the constraining divided mold. Deformation processing with. The split mold is deformed while tightening substantially the entire circumference of the container body with a force doubled from the outside to the inside of the container by a toggle mechanism, so that the isometric deformation can be performed more reliably with less power. be able to.
[0007]
Further, the polyhedral container manufacturing apparatus of the present invention includes a molding die comprising three or more divided molds arranged radially so as to surround the outside of the container, and the molding die is displaced inward of the container. It consists of a split mold displacement mechanism that applies a pressing force to the barrel, and the three or more split molds constrain almost the entire circumference of the container barrel when a pressing force is applied to the container barrel. The molding die is arranged so as to apply an inward pressing force to the barrel part, and the molding die has a deformable split mold for pressing and deforming the container barrel part and a bulge to the outside of the container trunk part. It consists of a combination of constraining split molds for restraining .
[0008]
Each of the divided molds is configured to be displaced and driven from the outside to the inside of the container by a toggle mechanism or a cam mechanism. The molding die in accordance with the molding shape, a combination of a container body composed of a deforming a split die to press deform split molds only, or container barrel deformation for split molds for pressing deformed And a combination of split molds composed of constraining split molds that restrain the bulging to the outside of the container body.
[0009]
The split mold is preferably detachably attached to an output lever that is displaced from the outside to the inside of the container by a toggle mechanism or a cam mechanism. In that case, the output lever, the split mold can be fitted has a split mold fitting groove, and fitted into the fitting groove combined the split molds to disengageably locking locking means It is comprised so that it may have. The split mold includes a mounting portion that is detachably attached to the output lever and a mold portion having a molding surface. Further, the mounting portion is formed in a plate shape that fits into the split mold fitting groove of the output lever, and locking portions that are locked to the locking means of the output lever are formed at the upper end portion and the lower end portion thereof. ing.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3 show an embodiment of a polyhedral container manufacturing apparatus according to the present invention, FIG. 1 shows a longitudinal section of a main part to be molded, FIGS. 2 and 3 are plan views thereof, and FIG. 2 shows a state before starting the forming process, and FIG. 3 shows a state at the end of the forming process.
In the polyhedral container manufacturing apparatus of this embodiment, as shown in FIG. 4, the body portion 51 of the can body 50 such as an aerosol can in which the eyelid lid 53 is wound around the opening of the cylindrical body portion is evenly flat side 52. This is a case of forming into a dodecahedron body consisting of 12 divided molds 3 arranged radially so that the body of the container to be processed is located on the outer periphery of a cylindrical space that can be located in the center. It has the molding die 2 which becomes. Since the split mold 3 forms a uniform dodecahedron in the present embodiment, all of the split molds 3 are constituted by a deforming mold, so that the force does not escape when a deformation force is applied to the container. The edges are arranged so that they can approach each other and hold the entire circumference of the forming portion. As a result, there is almost no partial stretching during the molding process, the molding process can be performed by changing the length of the can body, and the can body can be deformed without a core. Yes.
[0011]
In this embodiment, as shown in FIG. 1, each molding die 2 is configured to be displaced in the radial direction by a toggle mechanism. In FIG. 1, 5 is a fixed lever, 6 is an input lever, and 7 is an output lever. Links between the fixed lever 5 and the input lever 6 are links 8-1 and 8-2, and links between the input lever 6 and the output lever 7 are connected. The toggle mechanism is configured by connecting the units 9-1 and 9-2 so as to allow parallelogram movement. Each input lever 6 has an upper end that extends upward and is connected to driving means such as a cylinder or a motor (not shown) provided in the fixed portion so as to be moved up and down all at once. The levers 7 are displaced in the radial direction all at once. An appropriate guide roller 19 is provided at the lower end of the output lever so that it can smoothly reciprocate along the fixed base. The split mold 3 is detachably fixed to the output lever 7 as will be described later. In addition to the configuration in which the toggle mechanisms are driven all at once by a single common drive device, separate drive means may be provided for each toggle mechanism or for each group. In that case, since the stroke amount and timing of each divided mold can be controlled individually or for each group in accordance with the shape of the molding process, more varied molding is possible.
[0012]
As described later, the split mold 3 can be of any shape according to the shape of the body to be molded. In this embodiment, these molds can be detachably attached to the output lever. Constitutes a split mold chuck, and can barrels of various shapes can be formed by a single device by simply replacing the split mold. 5 and 6 show an embodiment of an output lever constituting the split mold chuck, and FIG. 7 shows an embodiment of a split mold configured to be detachable from the output lever. The state where the split mold is fixed to the output lever is shown.
[0013]
The output lever 7 of the present embodiment is configured so that the split mold can be attached and detached with a single touch, and as shown in FIGS. On the back side facing the lever side, long groove-like link connecting holes 11-1 and 11-2 into which the links 9-1 and 9-2 are swingably fitted are formed, and the link connecting holes are formed in the link connecting holes. The orthogonal shaft holes 12-1 and 12-2 are formed so that the links 9-1 and 9-2 fitted in the link connecting holes can be pivotally supported. Further, a split mold fitting groove 13 into which the plate-like mounting portion 20 of the split mold 3 shown in FIG. Has been. On the lower end portion side of the fitting groove, a locking pin 14 is provided across the fitting groove to which a locking recess formed in the lower end portion of the split mold is fitted and locked. Engagement pins 15 are provided to engage with the rear end locking portion of the upper end portion of the split mold. Further, an engagement protrusion 25 formed on the upper end of the split mold fitting portion 20 fitted in the fitting groove is engaged with the engagement pin 15 at the upper end of the output lever. The rocking | fluctuation locking piece 16 for doing is rockably provided. As shown in the drawing, the swinging locking piece 16 has a substantially U-shape, and both rear end portions thereof are pivotally attached to the side portions of the split mold, and the front end connecting portion thereof is connected to the split mold. It is a stop portion 17, which can swing upward from the upper end surface of the output lever, and in a state of being placed on the upper end surface, the engagement protrusion 25 of the split mold fitted in the fitting groove The engagement pin and the split mold locking portion are sandwiched and fixed between the rear end surfaces 18.
[0014]
On the other hand, the split mold 3 configured to be detachably attached to the output lever has a configuration shown in FIG. The split mold 3 is composed of a mounting part 20 and a mold part 21, and the mold part 21 is different depending on the shape to be molded, but the mounting part 20 has the same configuration as each split mold. ing. That is, a locking recess 22 that locks with the locking pin 14 of the output lever is formed at the lower end portion of the mounting portion 20, and the locking recess 22 is easily locked with the output lever. By forming the rear edge side wall portion 23 in the insertion direction of the locking concave portion longer than the front edge side wall portion 24 and tapered at the front end portion, the rear end portion is fixed to the bottom wall of the split mold fitting groove 13 and the locking pin. 14 is easily fitted. Further, an engaging projection 25 is formed at the upper end of the mounting portion 20 in the middle of the depth direction. The engaging projection 25 serves to lock the upper portion of the mounting portion 20 to the output lever 7 when the mounting portion 20 is fitted into the split mold engaging groove 13. The edge portion 26 is engaged with the engagement pin 15 provided on the output lever 7, and the front side edge portion 27 is engaged with the rear end surface 18 of the divided mold locking portion 17 of the swing locking piece 16. It has become. The front end edge 27 of the engaging protrusion 25 can be pushed in while the rear end edge 18 of the split mold locking portion 17 is engaged when the swinging locking piece 16 swings and is pushed down. It is formed in an arc shape so that it can be made. The rear edge 26 is formed deeper than the front upper edge 27 so that the rear edge 26 can engage with the engagement pin 15 provided on the output lever 7.
[0015]
The output lever 7 and the split mold 3 of the present embodiment are configured as described above, and the split mold 3 is attached to the output lever 7 by first engaging the lower end portion of the split mold 3 in an oblique state. By inserting the rear edge side wall portion 23 of the recess 22 between the locking pin 14 and the bottom wall of the split mold fitting groove 13, the locking recess 22 is locked to the locking pin 14. Next, by pushing the upper end of the split mold with the swinging locking piece raised until the rear edge 26 is engaged with the engagement pin 15, and pushing the swinging locking piece back in that state, The rear end face of the swinging locking piece engages or presses the front end edge 27 of the engaging protrusion, and the upper portion of the mounting portion 20 is locked in the fitting groove. As described above, the split mold 3 can be attached to the output lever 7 with one touch without requiring a special tool, and the mold change of the split mold can be easily and accurately performed without requiring skill. Can be done.
[0016]
The polyhedral container manufacturing apparatus of the present embodiment is configured as described above. As shown in FIGS. 1 and 2, the can body 50 is divided into split molds with the output lever 7 in which the split mold 3 is set retracted. The cylindrical space portion surrounded by the mold group is supplied by an appropriate supply device, and at this position, the driving means (not shown) is driven to drive the input lever 6 down so that the output lever 7 moves radially toward the center of the can body. Then, the mold surface of the mold part of the split mold is pushed into the can body with a strong force increased by the boost mechanism. At that time, since the flat mold surface 29 of the split mold is pressed in a state where the entire circumference of the can body is tightened, the material is deformed while maintaining substantially the same length without stretching due to escape of the material, and instantaneously in one stroke. It can be accurately formed in a dodecahedron shape. Therefore, it can shape | mold without giving a damage to the coating film of a can inner and outer surface. Then, after the molding is completed, the input lever 6 is raised, the divided mold 3 is returned to the original position, and the can body is opened. Then, the can body 50 is lowered to pass the position of the molding mold, and the next process is performed. send. The shape and application of the container that can be molded by the method for producing a polyhedral container of the present invention are not limited, but the molding process is performed in a state where the rigidity of the opening end surface of the container is increased, that is, necking or flange. It is preferable to carry out after the processing step.
[0017]
In the said embodiment, although it is an example at the time of shape | molding a can body into a regular dodecahedron, next, as shown in FIG. 10, for example, partially leaving the original can body outer diameter part, An embodiment in the case of manufacturing a polyhedral container recessed inward will be described. In the can body 55 of the embodiment shown in FIG. 10, six relatively large arc-shaped vertical grooves 57 that are recessed inwardly are formed in the body portion 56 at an equal pitch, and the vertical groove wall 58 is substantially the original. The shape of the body wall of the can body is maintained.
[0018]
In the case of molding the can body, it can be easily carried out by simply exchanging only the split mold in the apparatus of the embodiment. FIG. 9 shows an embodiment of the polyhedral container manufacturing apparatus in that case. In FIG. 9, 35 is a fixed lever, 36 is an input lever, 37 is an output lever, 38 and 39 are links, and the output lever is driven to be displaced in the radial direction by the toggle mechanism as in the above embodiment. In this embodiment, the split mold is a split mold for deformation processing for forming the arc-shaped vertical groove 57 and a constraining split that restrains a portion corresponding to the vertical groove wall 58 of the can body during the molding process. It consists of two types of molds 41, and these divided molds are alternately mounted on the output lever 37 as shown in FIG. 9 (a).
[0019]
In the embodiment shown in FIG. 9, the can body is formed by the toggle mechanism, in which each output lever is displaced toward the center of the can body by a predetermined stroke, so that the split mold 40 for deformation processing has the barrel portion inside. The arc-shaped vertical groove 57 is formed by pushing in the direction. Meanwhile, as shown in FIG. 9B, the constraining split mold 41 restrains deformation of the longitudinal groove wall 58 at the outer surface of the can body, as shown in FIG. As a result, only the can body portion pressed by the deformable split mold 40 is deformed inward to form an arcuate vertical groove 57, which is molded into a can body having a cross-sectional shape shown in FIG. Can do.
[0020]
According to the polyhedral container manufacturing apparatus of the present invention, not only the above-mentioned shape but also various shapes of containers can be formed, and various forms of divided molds can be selected. FIG. 12 shows a can body 60 according to another embodiment corresponding to one having a longitudinal groove shape in which the bottom of the longitudinal groove is linearly bent instead of the arcuate longitudinal groove in the can body shown in FIG. Is shown. In this case, the six longitudinal grooves 62 formed through the longitudinal groove walls 64 in the axial direction of the can body 61 have a groove bottom that is straightly bent along the axis at the central portion 63 and becomes sharp. It has become. The split mold for deformation processing in the case of performing vertical groove processing in which the groove bottom portion is bent at the center portion, particularly deep groove processing, does not necessarily have a mold surface having the same shape over the entire length of the long groove to be processed. Is possible.
[0021]
FIG. 11 shows a split mold 42 for deformation processing when the can body shown in FIG. 12 is formed. In this case, as shown in FIG. 2B, the molding die surface 29 has a sharply projecting sharpened portion 43 in a triangular roof shape in a predetermined section at the center, and both ends thereof are directed to the upper and lower ends. The ridgeline 44 is inclined.
[0022]
As described in the above embodiment, the can body is molded by the split mold having such a shape, and the entire circumference of the can body is held by the split mold for deformation and the split mold for restraint. Therefore, when the most projecting sharpened portion 43 of the split mold 42 for deformation is brought into contact with the can body, the can body is automatically deformed along the ridge lines 44 at both ends from the most projecting sharpened portion 43 by the pushing action. Therefore, it is possible to form a groove that is sharper, longer, and deeper than the shape of the molding surface that is the convex shape of the split mold. Even if the mold surface has a sharp convex shape, if the amount of pressing is small, the mold surface is molded along the shape of the mold surface. Therefore, by utilizing such a molding principle, it is possible to perform a molding process with a variety of shapes regardless of a complicated molding die surface.
[0023]
FIG. 13 is a schematic view of a polyhedral container manufacturing apparatus according to another embodiment of the present invention. In this embodiment, the driving of the molding die is replaced with the toggle mechanism of the embodiment as compared with the embodiment. The cam mechanism is different. The same members as those in the above embodiment are denoted by the same reference numerals, and only the differences will be described. In this embodiment, the input lever 44 is provided so as to be axially displaceable with an appropriate linear guide 46 with respect to the fixed lever 5, and a cam surface 45 is formed on the side of the input lever 44 facing the output lever. is there. On the other hand, the output lever 47 is provided with a cam follower 48 that engages with the cam surface, and the input lever 44 is moved up and down by an appropriate actuator (not shown) to be displaced inward of the can body, and the can body surface is pushed in. Mold into shape. The output lever 47 is guided by an appropriate guide (not shown) so as to be linearly displaceable in the inner direction of the can body, and an appropriate biasing force of the tension spring 49 and the like so that the cam follower 48 is always engaged with the cam surface 45. Energized by means.
[0024]
As mentioned above, although various embodiment of this invention was described, the polyhedral container manufacturing apparatus of this invention is not restricted to the said embodiment, A various design change is possible within the range of the technical idea. Also, the shape of the container to be molded is not limited, and the cross-sectional shape is arbitrary polyhedron such as triangle, quadrangle, hexagon, octagon, dodecagon, etc., for example, the cross-sectional shape is different vertically in the axial direction It is possible to perform arbitrary processing such as providing a recess partly. Also, the overall shape of the container can be applied to molding of various shaped containers such as a cylindrical can at the top and bottom, a polyhedral can at the top and bottom, a bottle-shaped metal can, a spray can, a beverage can, a wide mouth container, and a narrow mouth container. For example, FIG. 14 shows a case in which regular dodecahedron processing is applied to the can body 66 that has undergone necking and curling processes at the open end, and FIG. 15 shows a bottle-shaped can body 68 with a longitudinal groove center 69 that is linear. The case where the vertical groove | channel 70 currently bent is continuously formed is shown.
[0025]
【The invention's effect】
As described above, according to the present invention, an inward pressing force is applied to the barrel while restraining substantially the entire circumference of the container barrel by a molding die comprising a plurality of divided molds arranged outside the vessel. In addition, the material of the molding surface is prevented from being stretched and can be molded with substantially equal deformation, and the high-quality polyhedral container can be obtained without damaging the coating film on the inner and outer surfaces of the container. In particular, the barrel part can be deformed only with the split molds arranged on the outside of the container, and there is no need to provide a core or mold on the inner surface of the container. And the inner layer is not damaged. The molded container hardly bulges outside the original outer diameter of the cylinder, and even if it is a very small amount, it is possible to obtain a polyhedral container that is not easily damaged during transportation.
[0026]
And according to the manufacturing apparatus and manufacturing apparatus of the polyhedral container of the present invention, since the processing of a complicated shape can be instantaneously performed without being restricted by the width of the container mouth, the container can be differentiated. . In addition, when deep groove machining is performed with a deformable split mold having a sharp die surface, the deformation of the container proceeds from a position pressed by the sharp die surface and is more than the tip shape of the deformable split die. Sharp and deep grooving can be done with one stroke.
[0027]
Furthermore, by providing a locking means for detachably locking the split mold with a one-touch on the output lever that is driven to move from the outside to the inside of the container by a toggle mechanism or cam mechanism, It is possible to obtain various types of containers simply by exchanging divided molds according to the container shape, and it is easy to change molds of divided molds without the need for special tools or skill. And accurately.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a polyhedral container manufacturing apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view showing an arrangement state of the molding die before starting the molding process.
FIG. 3 is a plan view showing an arrangement state of the molding die at the end of the molding process.
4A and 4B show one embodiment of a container manufactured by the method for manufacturing a polyhedral container of the present invention, in which FIG. 4A is a front view, and FIG.
FIG. 5 is a perspective view showing an embodiment of an output lever (split mold chuck) in the polyhedral container manufacturing apparatus of the present invention.
6A is a rear view of the output lever shown in FIG. 5, and FIG. 6B is a front view thereof.
FIGS. 7A and 7B show an embodiment of a split mold in the polyhedral container manufacturing apparatus of the present invention, wherein FIG. 7A is a perspective view thereof, and FIG.
8 is a front longitudinal sectional view of the output lever shown in FIG. 6 in a state where the split mold shown in FIG. 7 is mounted.
FIG. 9A is a plan view showing an arrangement state before the molding process of the molding die is started in the polyhedral container manufacturing apparatus according to another embodiment of the present invention, and FIG. 9B is an arrangement state at the end of the molding process. It is a plane schematic diagram which shows.
10A and 10B show another embodiment of a container manufactured by the method for manufacturing a polyhedral container according to the present invention, in which FIG. 10A is a front view, and FIG.
11 shows another embodiment of the split mold in the polyhedral container manufacturing apparatus of the present invention, where (a) is a perspective view thereof and (b) is a DD cross-sectional view thereof. FIG.
12A and 12B show another embodiment of a container manufactured by the method for manufacturing a polyhedral container according to the present invention, in which FIG. 12A is a front view, and FIG.
FIG. 13 is a schematic front view of a polyhedral container manufacturing apparatus according to another embodiment of the present invention.
FIG. 14 shows still another embodiment of a container manufactured by the method for manufacturing a polyhedral container of the present invention, in which (a) is a front view and (b) is an FF cross-sectional view thereof.
FIG. 15 shows still another embodiment of a container manufactured by the method for manufacturing a polyhedral container of the present invention, wherein (a) is a front view and (b) is a GG sectional view thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Polyhedron container manufacturing apparatus 2 Molding die 3, 42 Split die 5, 35 Fixing lever 6, 36, 44 Input lever 7, 37, 47 Output lever 8-1, 8-2, 9-1, 9-2, 38, 39 Link 11-1, 11-2 Link connection hole 13 Divided mold fitting groove 14 Locking pin 16 Oscillating locking piece 17 Divided mold locking part 20 Mounting part 21 Mold part 22 Locking concave part 25 Engaging protrusion 29 Mold surface 40 Deformation split mold 41 Restraining split mold 45 Cam surface 48 Cam follower 57, 62 Vertical groove 60 Can body 61 Can body

Claims

A molding die composed of three or more divided molds arranged radially on the outside of the container, and by applying an inward pressing force to the barrel while restraining almost the entire circumference of the barrel, consists in deforming the barrel only by split molds that are disposed outside, the molding die, bulging of the container body to the outside of the deformation for the split molds which pressed and deformed and the container body The deforming split mold while constraining the container body so that the container body does not bulge outwardly during the deformation of the container body while the container body is being deformed. A process for producing a polyhedral container, wherein the body part is pushed inward and deformed.

The method for manufacturing a polyhedral container according to claim 1 , wherein the split mold is deformed while tightening substantially the entire circumference of the container body by a force that is boosted from the outside to the inside of the container by a toggle mechanism.

Molding die composed of three or more split molds arranged radially so as to surround the outside of the container, split mold displacement for applying a pressing force to the container body by displacing the molding mold inward of the container The above-mentioned three or more divided molds apply an inward pressing force to the body part while restraining the entire circumference of the container body part when the pressing force is applied to the container body part. The molding die is composed of a combination of a deforming split mold that press-deforms the container body and a constraining split mold that restrains the bulging to the outside of the container body. An apparatus for producing a polyhedral container, which is characterized.

The apparatus for manufacturing a polyhedral container according to claim 3 , wherein each of the divided molds is driven to move from the outside to the inside of the container by a toggle mechanism.

The polyhedral container manufacturing apparatus according to claim 3 , wherein each of the divided molds is driven to be displaced from the outside to the inside of the container by a cam mechanism.

The polyhedral container according to any one of claims 3 to 5 , wherein the divided mold is detachably attached to an output lever that is driven to move from the outside to the inside of the container by a toggle mechanism or a cam mechanism. apparatus.

The output lever has a split mold fitting groove into which the split mold can be fitted, and has a locking means for detachably locking the split mold fitted in the fitting groove. The apparatus for producing a polyhedral container according to claim 6 .

The polyhedral container manufacturing apparatus according to claim 6 or 7 , wherein the split mold includes a mounting portion that is detachably mounted on the output lever and a mold portion having a molding surface.

The mounting portion is formed in a plate shape that fits into the split mold fitting groove of the output lever, and locking portions that are locked to the locking means of the output lever are formed at the upper end portion and the lower end portion thereof. The apparatus for producing a polyhedral container according to claim 8 .