JP2005040819A

JP2005040819A - Magnet stripper device

Info

Publication number: JP2005040819A
Application number: JP2003202205A
Authority: JP
Inventors: Kozo Nakamura; 幸造中村
Original assignee: Showa Aluminum Can Corp
Current assignee: Altemira Co Ltd
Priority date: 2003-07-28
Filing date: 2003-07-28
Publication date: 2005-02-17

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stripper device for reliably drawing a drawn-ironed can barrel to hold a punch tip part without causing damages by a punch after completing ironing and doming of a bottom portion. <P>SOLUTION: The stripper device of the drawn-ironed can barrel comprises a plurality of segments having a claw part engaged with an opening end face of the can barrel and capable of drawing the can barrel from a punch on a tip thereof and capable of the claw parts by the magnetic force, a magnet member to open/close the claw parts of the segments in the direction in which the claw parts are closed or opened by the magnetic force, and a cam mechanism interlocked with an annular elastic member or the punch to bias the segments in the direction in which the claw parts are opened or closed. The magnet member has a magnet device capable of applying the magnetic force so that the claw parts are opened while the punch advances and passes through the stripper device or so that the claw parts draw the can barrel by the circumferential surface of the punch when the punch is retracted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【産業上の利用分野】
本発明は、しごき成形および底部のドーミング加工終了後、ポンチ先端部を抱きかかえている絞り−しごき缶胴体を、ポンチから確実にかつ傷を付けることなく抜取るためのストリッパー装置に関する。
【０００２】
【従来の技術】
飲料用のアルミニウムあるいはすずメッキ鋼板などは、その素材を深絞り、しごき加工して成形缶とするが、中でもアルミニウム缶はビール用容器として大量に使用されており、その生産量は極めて膨大なものと推定される。このため製造装置の１台あたりの生産は３００個〜４００個／分を大きく超える高速度の生産性を必要としている。素材を深絞り、しごき加工をして缶胴体を成形する場合には、前工程で深絞りされたカップを再絞りダイスとポンチスリーブによって再絞りとしごき加工を行い、それからダイスによって複数工程のしごき加工を行って最終的に缶胴体を成形している。
【０００３】
このため各成形段階、特に最終の成形段階においては、側壁部はしごき加工が強く行われるため、開口部の側壁厚さは、缶の中央部の側壁厚さより厚くなり、ポンチスリーブに対して缶胴体が強く密着し、成形された缶胴体をポンチスリーブから抜き出すことが困難となっている。この缶胴体のポンチスリーブからの抜き出し工程が生産速度に重要な影響を与えるので、絞り−しごき装置にはポンチスリーブから缶胴体を抜き出すためにストリッパー装置は重要な意味を持っている。
【０００４】
従来絞り−しごき缶胴体のストリッパー装置としては種々の提案が行なわれている（例えば特許文献１，特許文献２、特許文献３参照）
これらの絞り−しごき装置に設けられるストリッパー装置は何れも、環状に配列された複数のセグメントを有し、セグメントの外周面が環状スプリングのような環状弾性部材によってセグメント先端の爪部が閉じる方向にバイアスされていて、ポンチの後退、すなわち復帰工程において、ポンチ周面に接触していた爪部と缶胴体の開口端面が係合して、缶胴体がポンチより抜取られるタイプのものである。
【０００５】
これら従来のストリッパー装置は、ポンチがダイスに挿通していない時はセグメントの爪部は完全に閉じた状態になっている、従ってポンチが前進してしごき直後の缶胴体がストリッパー装置を通過する直前には完全に閉じている。
そのためこの通過のさい、缶胴体の底部周縁部がセグメントの爪部近傍の内側コーナに衝撃的に当りながら爪部が開くため、セグメント爪部が缶胴体底部周縁部に当り、そこに痕がついて商品価値を低下するという問題を生じていた。
【０００６】
またその戻り（閉じる場合）はスプリングの強さによりその速度及び強さが規制され、強く早い場合、一旦衝撃的に缶胴体の外径よりも大きく開いた爪部は、戻るさいに缶胴体が完全に通過する前に爪部が戻ってきて、缶胴体の胴壁部に衝撃的に当って、この部分にも当り痕を生じ易いという問題を生ずる。
一方、該スプリング力が弱いときは、戻りが遅くなり、セグメント爪部の作動速度の低下は生産性を低下させる原因となったりする。このように爪部は缶胴体が通過する毎に繰返し衝撃的に缶胴体に当るので、柔らかいアルミニウム缶などの場合においては缶胴体が傷つき易く、またセグメントの寿命が比較的短かく、その交換のため生産性が低下するという問題があった。
【０００７】
この問題を解決するものとして、ポンチから絞り−しごき缶胴体を抜取るためのストリッパー装置において、該装置は、先端に該缶胴体の開口端面と係合可能な爪部を有し、基部に外方突出部を備える、揺動可能な複数のセグメント、該セグメントの揺動支点を外周面に有する短円筒部を備える該セグメントの支持体、該セグメントの外周面を包囲し、該爪部が閉じる方向に該セグメントが揺動するように該セグメントをバイアスする環状弾性部材、および少なくとも該缶胴体が前進して該ストリッパー装置を通過している間、該外方突出部を押上げて該爪部が開くよう該セグメントを揺動させる装置を備えた絞り−しごき缶胴体のストリッパー装置（特許文献４）が提案されている。しかし高速の応答性に問題がある。
【０００８】
【特許文献１】
特公昭４３−１９６９７号公報
【特許文献２】
実公昭５４−２６３５２号公報
【特許文献３】
特公昭６０−１３３号公報
【特許文献４】
特公平６−０５９５０９号公報
【０００９】
【発明が解決しようとする課題】
本発明は、マグネットによりセグメントの開閉を時期的に規定し、カップを抱きかかえているポンチがストリッパー装置を高速に前進通過の際に缶胴体に傷のつくおそれがない様にセグメント爪部を開き、かつポンチが後退する際にはセグメントの爪部がポンチ周面に接触または近接して缶胴体をポンチスリーブから確実に抜き出すことが可能な、絞り−しごき成形体のストリッパー装置を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明は、
［１］ポンチから絞り−しごき缶胴体を抜取るためのストリッパー装置において、先端に該缶胴体の開口端面と係合しポンチから缶胴体を抜き取り可能な爪部を有し該爪部を磁力により開閉可能とした複数のセグメント、磁力により該爪部が閉じる方向又は開く方向に該セグメントの爪部を開閉するマグネット部材及び該爪部が開く方向か又は閉じる方向に該セグメントをバイアスする環状弾性部材またはポンチと連動したカム機構からなり、該マグネット部材は少なくとも該ポンチが前進して該ストリッパー装置を通過している間は該爪部が開くように磁力が作用するか又はポンチが後退するときに爪部がポンチ周面で缶胴体を抜き取るように磁力が作用するマグネット装置を備えたことを特徴とする絞り−しごき缶胴体のストリッパー装置、
【００１１】
［２］ポンチから絞り−しごき缶胴体を抜取るためのストリッパー装置において、先端に該缶胴体の開口端面と係合しポンチから缶胴体を抜き取り可能な爪部を有し該爪部が磁力により開閉可能とした複数のセグメント、磁力により該爪部が開閉両方向に該セグメントの爪部を開閉するマグネット部材からなり、該マグネット部材は該ポンチが前進して該ストリッパー装置を通過している間は該爪部が開くように磁力が作用し、ポンチが後退するときに爪部がポンチ周面で缶胴体を抜き取るように磁力が作用するマグネット装置を備えたことを特徴とする絞り−しごき缶胴体のストリッパー装置、
【００１２】
［３］マグネット部材が電磁石又は希土類磁石である上記［１］又は［２］２に記載の絞り−しごき缶胴体のストリッパー装置、
［４］環状スプリングまたはカム機構により、該爪部が常時開かれたセグメント爪部であるときは、該ポンチが後退するに際し、爪部がポンチ周面に接触するように磁力が作用するマグネット装置を備えた上記［１］に記載の絞り−しごき缶胴体のストリッパー装置、
［５］環状スプリングまたはカム機構により、該爪部が常時閉じられたセグメント爪部であるときは該ポンチが前進して該ストリッパー装置を通過している間はポンチが該ポンチが開くように磁力が作用するマグネット装置を備えた上記［１］に記載の絞り−しごき缶胴体のストリッパー装置、
【００１３】
［６］磁化させたセグメントを用い、マグネット部材の磁界をポンチに同期させて回転させ、爪部の開閉を強制的に行う上記［１］又は［２］に記載の絞り−しごき缶胴体のストリッパー装置、
［７］マグネット部材が、各セグメントに設けられた上記［１］ないし［６］に記載の絞り−しごき缶胴体のストリッパー装置、
［８］マグネット部材が、ポンチの往復に同期して往復し、少なくとも該ポンチが前進して該ストリッパー装置を通過している間は該爪部が開くように磁力が作用し、ポンチが後退するときに爪部がポンチ周面で缶胴体を抜き取るように磁力が作用するマグネット装置を備えた上記［１］ないし［７］に記載の絞り−しごき缶胴体のストリッパー装置、
【００１４】
［９］ポンチから絞り−しごき缶胴体を抜取るに際し、先端に該缶胴体の開口端面と係合しポンチから缶胴体を抜き取り可能な爪部を有し該爪部を磁力により開閉可能とした複数のセグメント、磁力により該爪部が閉じる方向又は開く方向に該セグメントの爪部を開閉するマグネット部材及び該爪部が開く方向か又は閉じる方向に該セグメントをバイアスする環状弾性部材またはポンチと連動したカム機構を用い、該マグネット部材は少なくとも該ポンチが前進して該ストリッパー装置を通過している間は該爪部が開くように磁力を作用させるか又はポンチが後退するときに爪部がポンチ周面で缶胴体を抜き取るように磁力を作用させるマグネット装置を用いたことを特徴とする絞り−しごき缶胴体の抜き取り方法、及び
【００１５】
［１０］ポンチから絞り−しごき缶胴体を抜取るに際し、先端に該缶胴体の開口端面と係合しポンチから缶胴体を抜き取り可能な爪部を有し該爪部が磁力により開閉可能とした複数のセグメント、磁力により該爪部が開閉両方向に該セグメントの爪部を開閉するマグネット部材からなり、該マグネット部材は該ポンチが前進して該ストリッパー装置を通過している間は該爪部が開くように磁力を作用させ、ポンチが後退するときに爪部がポンチ周面で缶胴体を抜き取るように磁力を作用させるマグネット装置を用いたことを特徴とする絞り−しごき缶胴体の抜き取り方法、を開発することにより上記の課題を解決した。
【００１６】
【発明の実施の形態】
本発明において、絞り−しごき缶胴体のストリッパー装置の第１の態様は、セグメントの爪部が、スプリングあるいはポンチと連動するカム機構により常時開又は閉の状態に保持されており、操業に際し強制的にスプリング力に抗してあるいはポンチと連動するカム機構を解除してマグネット部材を用いて、その爪部を強制的に閉じるかまたは開くかを行うものあり、ポンチが前進して該ストリッパー装置を通過している間は該爪部が開くように磁力を作用させるか又はポンチが後退するときに爪部がポンチ周面で缶胴体を抜き取るように磁力が作用するマグネット装置を備えたものである。
また第２の態様としては、セグメント爪部の開閉をすべてマグネット部材の磁力によって強制的に行うものである。この場合はポンチが前進して該ストリッパー装置を通過している場合には該爪部が開くように磁力を作用させ、ポンチが後退するときにはセグメント爪部がポンチ周面に接触または近接してポンチから缶胴体を抜き取るように磁力を作用させるようにマグネット装置を操作できるものである。
【００１７】
両態様共にマグネット装置としては、マグネット力が強いほどまた小型であるほど好ましいので電磁石が好ましい。なおネオジウム、サマリウムなどの希土類元素を用いた磁石には磁力の強いものがあるので使用方法によっては実用的に使用の可能性がある。
【００１８】
まず第１の態様の、スプリングあるいはポンチに連動するカム機構とマグネット装置を併用する方法としては、従来のストリッパー装置と同様にスプリングあるいはポンチと連動するカム機構を用いて常時セグメントの爪部を閉じるようにしておく。ポンチが前進してストリッパー装置を通過する直前にマグネット装置により爪部が開き、通過している間は開いた状態を保持するようにする。缶胴体が成形され、ポンチが後退する直前にマグネット装置の停止または機械的に取り除く、もしくは磁石を回転させることにより磁力を変化させ、スプリングあるいはポンチと連動するカム機構によりセグメントの爪部を閉じるようにする。あるいはスプリングあるいはポンチと連動するカム機構により上記セグメントの爪部を常時開いておくようにして、マグネット装置により閉じるようにすることも可能である。
【００１９】
第２の態様のセグメント爪部の開閉をすべてマグネット部材の磁力によって行う時には、マグネット装置の起動、停止あるいは回転とポンチの前進、後退を連動させて、爪部の開閉をコントロールすることができる。
マグネット装置による爪部の開閉は、爪部の先端に直接磁力を作用させて開閉をコントロールすること、セグメントを揺動できるように支点を設け、その根元に強磁性体を接着してそこに磁力を作用させること、セグメントに作用棒を設け、その作用棒の先端部に磁力を作用させることなどによりセグメント爪部を強制的に開閉させても良い。
【００２０】
マグネット装置の使用方法としては、特に磁力を用いる方法であれば制限がないが、例えばマグネット部材を環状に組み立て、ポンチの前進、後退に合わせてセグメントの作用位置に前進後退させても良いし、セグメントにマグネット部材を組み付け電源をオン・オフして爪部をコントロールしても良いし、セグメントの作用点にプラスまたはマイナスの磁石としておき、電磁石の電流の方向を変換することにより爪部の開閉を行ってもよい。
【００２１】
以下図面を参照して発明をより具体的に説明する。
図１は、本発明に使用できるに電磁石を用いたマグネットセグメントＡの１例の断面図である。セグメント１は強磁性体からなり、スプリング２により常時外方に押しつけられる様になっている。マグネットコイル３とセグメント１は非磁性体４を挟んだ位置に設けられ、通電することによりスプリング２に抗してセグメント１を引きつけるようにしてある。
【００２２】
このマグネットセグメントＡは、図２または図３に示す様に、絞り・しごき装置の往復するポンチ５に近接して、ポンチ周囲に複数個、例えば４個設けられ、ポンチの後退時にポンチ周面に成形された成形された缶胴体４を強制的に引き抜くものである。
即ち、ポンチが一番後退した時点でポンチ５先端部に缶胴体４を装着し、図２に示す様にダイス５を通過させて缶胴体の絞り・しごき加工を行う。ポンチ５はさらに前進して複数のマグネットセグメントＡからなる缶胴体４のストリッパー装置Ｂを缶胴体４が完全に通過するところまで前進する。このポンチ５の前進中はセグメント１の先端部、爪部１１は電磁石によりポンチ５周面から離れた位置にあり、缶胴体４には接触出来ない位置に固定されている。
【００２３】
次いで図３に示すように、缶胴体４を装着したポンチ５はやがて反転して後退を開始する。この瞬間にマグネットセグメントＡはスプリングによりセグメント爪部１１をポンチ面に接触あるいは缶胴体４を抜き取ることが可能な位置まで近接し、缶胴体４の後退を阻止することによりポンチ５から強制的に抜き取る。
【００２４】
なお上記の説明はスプリングと電磁石を用いたマグネットセグメントの例を示したが、セグメント爪部の開閉はスプリングに代えて、ポンチの前進あるいは後退に連動する様にしたカム機構を用いても良いし、又はセグメントの開閉を全て電磁石を用いて行うこともできる。また希土類磁石を用い、これを回転することにより磁極を変化させ、セグメントの開閉を行っても良い。この場合には例えばセグメント内に磁石を埋め込み、外部にも磁石を用いてポンチと連動させて外部磁石を回転し、異極間の吸引力と同極間の反発力を利用すればよい。
【００２５】
【発明の効果】
本発明は、マグネットによりセグメントの開閉を強制的に行うことにより、缶胴体に抱きかかえられているポンチが、ストリッパー装置を通過前進する際にはセグメントを缶胴体に接触しないように開き、後退する際にセグメント爪部を閉じて、缶胴体に傷のつくおそれがない様にかつポンチが後退する際にはセグメントの爪部がポンチ周面に接触または近接して缶胴体をポンチスリーブから確実に抜き出すことを可能とし、缶胴体には傷が発生しない絞り−しごき成形体のストリッパー装置を提供するものである。
【図面の簡単な説明】
【図１】本発明に使用するマグネットセグメントの１例の断面図。
【図２】本発明の絞り・しごき装置において、ポンチ前進時の断面図。
【図３】本発明の絞り・しごき装置において、ポンチ後退時の断面図。
【符号の説明】
１セグメント
２スプリング
３マグネットコイル
４非磁性体
５ポンチ
６缶胴体
１１セグメント爪部
Ａマグネットセグメント
Ｂストリッパー装置[0001]
[Industrial application fields]
The present invention relates to a stripper device for removing a draw-iron iron body holding a punch tip portion from a punch reliably and without scratching after completion of iron forming and bottom doming.
[0002]
[Prior art]
Aluminum and tin-plated steel sheets for beverages are deep-drawn and ironed into molded cans, but aluminum cans are used in large quantities as beer containers, and their production is extremely large. It is estimated to be. For this reason, the production per one manufacturing apparatus requires high-speed productivity that greatly exceeds 300 to 400 pieces / minute. When forming the body of a can by deep drawing and ironing the material, the deep drawn cup is redrawn with a redraw die and a punch sleeve and then ironed in multiple steps. The can body is finally formed by processing.
[0003]
For this reason, in each forming step, particularly in the final forming step, the side wall portion is strongly squeezed, so that the side wall thickness of the opening becomes thicker than the side wall thickness of the central portion of the can and the can It is difficult to pull out the molded can body from the punch sleeve because the body adheres strongly. The stripper device has an important meaning for extracting the can body from the punch sleeve in the drawing and ironing device because the process of extracting the can body from the punch sleeve has an important influence on the production speed.
[0004]
Various proposals have been made as a stripper device for a conventional drawing-ironing can body (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).
Each of the stripper devices provided in these squeezing and squeezing devices has a plurality of segments arranged in a ring shape, and the outer peripheral surface of the segment is closed in a direction in which the claw portion at the end of the segment is closed by an annular elastic member such as an annular spring. The can body is of a type in which the can body is pulled out of the punch when the claw portion that is in contact with the punch peripheral surface and the opening end surface of the can body are engaged with each other in the backward movement of the punch.
[0005]
In these conventional stripper devices, when the punch is not inserted into the die, the claw portion of the segment is in a completely closed state, so that the can body just after the punch moves forward and passes through the stripper device Is completely closed.
Therefore, during this passage, the bottom edge of the bottom of the can body impacts the inner corner near the claw of the segment and the claw opens, so the segment claw hits the bottom edge of the bottom of the can body, leaving a mark on it. There was a problem of reducing the value of goods.
[0006]
Also, the speed and strength of the return (when closing) is regulated by the strength of the spring, and when it is strong and fast, once the claw that has been shockedly opened larger than the outer diameter of the can body, The claw part comes back before it completely passes, impacts the body wall part of the can body, and a problem arises that this part is liable to cause a mark.
On the other hand, when the spring force is weak, the return is delayed, and a decrease in the operating speed of the segment claw portion may cause a decrease in productivity. In this way, the nail portion repeatedly impacts the can body every time the can body passes, so in the case of a soft aluminum can, the can body is easily damaged, and the life of the segment is relatively short. Therefore, there is a problem that productivity is lowered.
[0007]
In order to solve this problem, in a stripper device for extracting a squeezing-ironing can body from a punch, the device has a claw portion that can be engaged with an open end surface of the can body at the tip, and an outer portion at the base portion. A plurality of swingable segments having a lateral protrusion, a support for the segment having a short cylindrical portion having a swing fulcrum of the segment on the outer peripheral surface, surrounding the outer peripheral surface of the segment, and closing the claw portion An annular elastic member that biases the segment so that the segment swings in the direction, and at least the claw portion by pushing up the outward projection while the can body advances and passes through the stripper device. A stripper device (Patent Document 4) has been proposed which is equipped with a device that swings the segment so that the segment opens. However, there is a problem with high-speed response.
[0008]
[Patent Document 1]
Japanese Patent Publication No. 43-19697 [Patent Document 2]
Japanese Utility Model Publication No. 54-26352 [Patent Document 3]
Japanese Patent Publication No. 60-133 [Patent Document 4]
Japanese Patent Publication No. 6-059509 [0009]
[Problems to be solved by the invention]
According to the present invention, the opening and closing of the segment is controlled by a magnet so that the punch holding the cup does not cause damage to the can body when passing through the stripper device at high speed. And a stripper device for a draw-ironing molded body, which can reliably extract the can body from the punch sleeve when the claw of the segment comes into contact with or close to the peripheral surface of the punch when the punch is retracted. Objective.
[0010]
[Means for Solving the Problems]
The present invention
[1] In a stripper device for pulling out the wrought-iron iron body from the punch, the tip has a claw portion that engages with the opening end surface of the can body and can be removed from the punch, and the claw portion is magnetically A plurality of segments that can be opened and closed, a magnet member that opens and closes the claw portion of the segment in a direction in which the claw portion closes or opens by magnetic force, and an annular elastic member that biases the segment in a direction in which the claw portion opens or closes Or a cam mechanism interlocked with a punch, and the magnet member is operated when a magnetic force is applied so that the claw portion opens or the punch moves backward while the punch advances and passes through the stripper device. A drawing-stripping can body stripper device, characterized in that it has a magnet device in which a magnetic force acts so that the claw portion pulls out the can body on the peripheral surface of the punch. Place
[0011]
[2] In a stripper device for pulling out the squeezing-ironing can body from the punch, the tip has a claw portion that engages with the opening end surface of the can body and can be removed from the punch, and the claw portion is magnetically A plurality of segments that can be opened and closed, and the claw portion is composed of a magnet member that opens and closes the claw portion of the segment in both opening and closing directions by magnetic force, and the magnet member is moved while the punch advances and passes through the stripper device. A squeezing-ironing can body comprising a magnet device in which a magnetic force acts so that the claw portion opens and the claw portion pulls out the can body from the peripheral surface of the punch when the punch moves backward Stripper equipment,
[0012]
[3] The stripper device for a drawn-iron iron can body according to [1] or [2] 2, wherein the magnet member is an electromagnet or a rare earth magnet.
[4] When the claw portion is a segment claw portion that is always opened by an annular spring or a cam mechanism, a magnetic device in which a magnetic force acts so that the claw portion comes into contact with the peripheral surface of the punch when the punch is retracted. A stripper device for drawing-ironing can bodies as described in [1] above,
[5] When the claw is a segment claw that is always closed by an annular spring or cam mechanism, the magnetic force is applied so that the punch can be opened while the punch advances and passes through the stripper device. A stripper device for a drawing-ironing can body as described in [1], comprising a magnet device on which
[0013]
[6] The drawn-iron iron body stripper according to [1] or [2], wherein the magnetized segment is used to rotate the magnetic field of the magnet member in synchronization with the punch to forcibly open and close the claw portion. apparatus,
[7] A stripper device for a drawn-iron iron can body according to the above [1] to [6], wherein the magnet member is provided in each segment,
[8] The magnet member reciprocates in synchronization with the reciprocation of the punch, and at least while the punch advances and passes through the stripper device, a magnetic force acts so that the claw portion opens, and the punch moves backward. The stripper device for drawing-ironing can body as described in the above [1] to [7], comprising a magnet device in which a magnetic force acts so that the pawl part is pulled out from the peripheral surface of the punch.
[0014]
[9] When extracting the wrought-iron iron body from the punch, the front end has a claw portion that engages with the opening end surface of the can body and can be removed from the punch, and the claw portion can be opened and closed by a magnetic force. Interlocking with a plurality of segments, a magnet member that opens and closes the claw portion of the segment in a direction in which the claw portion closes or opens by magnetic force, and an annular elastic member or punch that biases the segment in the direction in which the claw portion opens or closes When the punch moves forward and passes through the stripper device, the magnet member applies a magnetic force so that the pawl is opened, or the pawl is punched when the punch is retracted. A drawing-ironing can body extracting method characterized by using a magnet device that applies a magnetic force so as to extract the can body on the peripheral surface; and
[10] When extracting the wrought-iron iron body from the punch, the front end has a claw part that engages with the opening end surface of the can body and can be removed from the punch, and the claw part can be opened and closed by a magnetic force. A plurality of segments, each of which includes a magnet member that opens and closes the claw portion of the segment in both directions of opening and closing by magnetic force, and the claw portion moves while the punch advances and passes through the stripper device. A drawing-ironing can body extraction method characterized by using a magnet device that applies a magnetic force to open, and when the punch moves backward, the claw portion pulls out the can body from the peripheral surface of the punch, By solving this problem, the above problems were solved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the first aspect of the stripper device for the squeezing-ironing can body is that the claw portion of the segment is held in a normally open or closed state by a cam mechanism interlocked with a spring or punch, and is forced during operation. The magnetic mechanism is used to forcibly close or open the claw part against the spring force or to release the cam mechanism interlocked with the punch, and the punch advances to move the stripper device. While passing, it has a magnet device that applies a magnetic force so that the claw portion opens, or when the punch moves backward, the claw portion pulls out the can body on the peripheral surface of the punch. .
Moreover, as a 2nd aspect, all opening and closing of a segment nail | claw part is forcedly performed by the magnetic force of a magnet member. In this case, when the punch moves forward and passes through the stripper device, a magnetic force is applied so that the claw portion is opened. When the punch is retracted, the segment claw portion is in contact with or close to the peripheral surface of the punch. The magnet device can be operated so as to apply a magnetic force so as to extract the can body from the can.
[0017]
In both aspects, an electromagnet is preferred as the magnet device because the stronger the magnet force and the smaller the magnet device, the better. Note that magnets using rare earth elements such as neodymium and samarium have strong magnetic force and may be practically used depending on the method of use.
[0018]
First, as a method of using the cam mechanism linked with the spring or punch and the magnet device in the first mode, the claw portion of the segment is always closed by using the cam mechanism linked with the spring or punch as in the conventional stripper device. Keep it like that. Immediately before the punch advances and passes through the stripper device, the claw portion is opened by the magnet device, and the open state is maintained while it passes. The can body is molded, and the magnetic device is stopped or mechanically removed just before the punch is retracted, or the magnetic force is changed by rotating the magnet, and the claw portion of the segment is closed by a cam mechanism interlocking with the spring or punch. To. Alternatively, the claw portion of the segment can be always opened by a cam mechanism interlocked with a spring or a punch, and can be closed by a magnet device.
[0019]
When the opening and closing of the segment claw portion of the second aspect are all performed by the magnetic force of the magnet member, the opening and closing of the claw portion can be controlled by interlocking the start, stop or rotation of the magnet device with the forward and backward movement of the punch.
To open and close the claw part with a magnet device, the magnetic force is directly applied to the tip of the claw part to control the opening and closing, and a fulcrum is provided so that the segment can be swung, and a ferromagnetic material is bonded to the root of the magnetic part. The segment claw portion may be forcibly opened and closed by, for example, applying an action rod to the segment and applying a magnetic force to the tip of the action rod.
[0020]
The method of using the magnet device is not particularly limited as long as it uses a magnetic force, but for example, the magnet member may be assembled in an annular shape and moved forward and backward to the operating position of the segment in accordance with the forward and backward movement of the punch. A magnet member can be assembled to the segment to control the claw by turning the power on and off, or a positive or negative magnet at the point of action of the segment, and opening and closing the claw by changing the direction of the electromagnet current May be performed.
[0021]
Hereinafter, the invention will be described in more detail with reference to the drawings.
FIG. 1 is a cross-sectional view of an example of a magnet segment A using an electromagnet that can be used in the present invention. The segment 1 is made of a ferromagnetic material and is always pressed outward by a spring 2. The magnet coil 3 and the segment 1 are provided at a position sandwiching the non-magnetic material 4 so that the segment 1 is attracted against the spring 2 by energization.
[0022]
As shown in FIG. 2 or FIG. 3, a plurality of, for example, four magnet segments A are provided around the punch in the vicinity of the reciprocating punch 5 of the squeezing and ironing device. The molded can body 4 is forcibly pulled out.
That is, when the punch is most retracted, the can body 4 is attached to the tip of the punch 5, and the can body is drawn and ironed through the die 5 as shown in FIG. The punch 5 further advances to advance to a point where the can body 4 completely passes through the stripper device B of the can body 4 composed of a plurality of magnet segments A. While the punch 5 is moving forward, the tip portion of the segment 1 and the claw portion 11 are positioned away from the peripheral surface of the punch 5 by an electromagnet, and are fixed at positions where they cannot contact the can body 4.
[0023]
Next, as shown in FIG. 3, the punch 5 with the can body 4 mounted thereon is turned over and starts to move backward. At this moment, the magnet segment A comes close to the position where the segment claw portion 11 can be brought into contact with the punch surface by the spring or the can body 4 can be pulled out, and the can body 4 is forcibly removed from the punch 5 by preventing the can body 4 from moving backward. .
[0024]
Although the above description shows an example of a magnet segment using a spring and an electromagnet, the opening and closing of the segment claw portion may be replaced with a spring, and a cam mechanism that is interlocked with the forward or backward movement of the punch may be used. Alternatively, all the segments can be opened and closed using an electromagnet. Alternatively, a rare earth magnet may be used, and the segment may be opened and closed by rotating the magnet to change the magnetic pole. In this case, for example, a magnet may be embedded in the segment, the external magnet may be rotated in conjunction with the punch using the magnet outside, and the attractive force between the different poles and the repulsive force between the same poles may be used.
[0025]
【The invention's effect】
The present invention forcibly opens and closes a segment by a magnet, so that when the punch held in the can body moves forward through the stripper device, the segment is opened and retracted so as not to contact the can body. When closing the segment claw part, there is no risk of scratching the can body, and when the punch is retracted, the segment claw part is in contact with or close to the punch peripheral surface to ensure that the can body is removed from the punch sleeve. It is an object of the present invention to provide a stripper device for a drawn and ironed molded body that can be extracted and does not cause damage to the can body.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an example of a magnet segment used in the present invention.
FIG. 2 is a cross-sectional view of the drawing and ironing device of the present invention when the punch is advanced.
FIG. 3 is a cross-sectional view of the drawing / squeezing device according to the present invention when the punch is retracted.
[Explanation of symbols]
1 Segment 2 Spring 3 Magnet Coil 4 Non-Magnetic Material 5 Punch 6 Can Body 11 Segment Claw A Magnet Segment B Stripper Device

Claims

In a stripper device for pulling out a squeezing-ironing can body from a punch, the front end has a claw portion that engages with the opening end surface of the can body and can be removed from the punch, and the claw portion can be opened and closed by a magnetic force. A plurality of segments, a magnet member that opens and closes the claw portion of the segment in a direction in which the claw portion closes or opens by magnetic force, and an annular elastic member or punch that biases the segment in the direction in which the claw portion opens or closes The magnet member has an interlocked cam mechanism, and the magnet member is operated so that the claw portion opens at least while the punch advances and passes through the stripper device, or the claw portion does not move when the punch moves backward. A drawing-ironing can body stripper device comprising a magnet device in which a magnetic force acts so as to pull out the can body from a punch peripheral surface.

In a stripper device for pulling out a squeezing and ironing can body from a punch, the tip has a claw portion that engages with the opening end surface of the can body and can be removed from the punch, and the claw portion can be opened and closed by a magnetic force. A plurality of segments, and a magnetic member that opens and closes the claw portion of the segment in both directions of opening and closing by magnetic force, and the magnet member moves the claw portion while the punch advances and passes through the stripper device. A stripper device for a drawing-ironing can body comprising a magnet device in which a magnetic force acts so that the magnetic force acts so that the claw portion pulls out the can body from the peripheral surface of the punch when the punch moves backward. .

The stripper device for a drawn-iron iron can body according to claim 1 or 2, wherein the magnet member is an electromagnet or a rare earth magnet.

When the claw portion is a segment claw portion that is always opened by an annular spring or a cam mechanism, a magnet device is provided in which a magnetic force acts so that the claw portion contacts the peripheral surface of the punch when the punch is retracted. The stripper device of the drawing-ironing can body according to claim 1.

When the pawl is a segment pawl that is normally closed by a ring spring or cam mechanism, a magnetic force acts so that the punch opens while the punch advances and passes through the stripper device. The stripper device of the drawing-ironing can body according to claim 1, further comprising a magnet device.

The drawing-ironing can body stripper device according to claim 1 or 2, wherein magnetized segments are used to rotate the magnetic field of the magnet member in synchronization with the punch to forcibly open and close the claw portion.

The stripper device for a drawing-ironing can body according to claim 1, wherein a magnet member is provided in each segment.

The magnet member reciprocates in synchronization with the reciprocation of the punch. At least while the punch advances and passes through the stripper device, a magnetic force acts so that the claw is opened, and the claw is moved when the punch moves backward. A stripper device for a squeezing and ironing can body comprising a magnet device in which a magnetic force acts so that a portion of the can body is pulled out by a punch peripheral surface.

A plurality of segments that have a claw portion that engages with the opening end surface of the can body at the tip and can be removed from the punch when the squeezing-ironing can body is extracted from the punch, and the claw portion can be opened and closed by magnetic force. A magnet member that opens and closes the claw portion of the segment in a direction in which the claw portion closes or opens by magnetic force, and a cam mechanism that interlocks with an annular elastic member or punch that biases the segment in the direction in which the claw portion opens or closes The magnet member is applied with a magnetic force so that the claw is opened at least while the punch is advanced and passes through the stripper device, or when the punch is retracted, the claw is formed on the peripheral surface of the punch. A drawing-ironing can body extracting method using a magnet device that applies a magnetic force so as to extract the can body.

A plurality of segments that have a claw portion that engages with the opening end surface of the can body at the tip and can be removed from the punch when the drawing-ironing can body is extracted from the punch, and the claw portion can be opened and closed by magnetic force. The claw portion is composed of a magnet member that opens and closes the claw portion of the segment in both opening and closing directions by magnetic force, and the magnet member opens the claw portion while the punch advances and passes through the stripper device. A drawing-ironing can body extracting method, characterized in that a magnetic device is used to apply a magnetic force so that the claw portion extracts the can body from the peripheral surface of the punch when the punch moves backward.