JP3593043B2

JP3593043B2 - Mold equipment for injection molding of hollow articles

Info

Publication number: JP3593043B2
Application number: JP2001024752A
Authority: JP
Inventors: 健一塚田; 康雄土屋
Original assignee: Nissei Plastic Industrial Co Ltd
Current assignee: Nissei Plastic Industrial Co Ltd
Priority date: 2001-01-31
Filing date: 2001-01-31
Publication date: 2004-11-24
Anticipated expiration: 2021-01-31
Also published as: JP2002225090A

Description

【０００１】
【発明の属する技術分野】
この発明は、固定型と可動型の間に設けた中間板の出入及び型開閉操作とによって、中空物品を射出成形する金型装置とに関するものである。
【０００２】
【発明が解決しようとする課題】
燃料タンク等の中空物品を射出成形する場合に用いられる従来の金型装置は、固定盤側の固定型と、可動盤側の固定型との間に、コア型と二次キャビティ形成用の凸条型を有する中子型や回転金型等の中間型を出入自在に設け、その中間型内に穿設したホットランナーを固定型と可動型の両方に分岐して一対の半体を一次射出成形し、その半体を中間型除去後の固定型と可動型との直接型閉により相互に当接して、当接部周囲に生じた二次キャビティに、樹脂を二次射出充填して中空物品を完成する構成からなる。
【０００３】
このような金型装置では、中間型内から固定型と可動型の両方に、半体成形用の樹脂を射出充填することになることから、中間型内のランナーはホットランナーとして温度維持する必要がある。また中間型は成形ごとに出入を繰返すので、そのような中間型に温度維持手段を施すことは容易ではなく、樹脂のオープンパージもできないことから、熱安定性の悪い材料樹脂による中空物品の成形に適応し難いものであった。
【０００４】
また中子による中間型をスライドして出入する金型装置にあっては、その中子に射出装置をノズルタッチしていることから、成形ごとにノズルタッチを繰り返さなければならず、このため樹脂の糸引きも生じ易い。しかも１台の射出装置を上下動して樹脂の一次射出と二次射出を行う構成なので、成形操作が複雑で複数個の中空物品を同時成形できず、材料樹脂も同一材質のものに限定されるなどの課題を有する。
【０００５】
これに比べて、回転金型を中間型として出入する金型装置では、回転金型を往復回動により一対の固定型と可動型との間を交互に出入できるようにして、回転金型内のホットランナーを、固定型側の両固定型に分岐したホットランナーと交互に接続し、これにより固定型側のホットランナーに常時ノズルタッチすることができるようにしているが、ホットランナーのゲートの切換を、回転金型の往復回動により交互に行って、樹脂の一次射出と二次射出をする構造のため、一対の固定型と可動型とを備えるものでも、同時に複数個の中空物品の成形が行えず、また材料樹脂も同一材質のものに限定されるなどの課題を有する。
【０００６】
この発明は、上記従来の金型装置における課題を解決するために考えられたものであって、その目的は、ホットランナーを複数とし、その一方を固定型と可動型との間の出入自在な中間板を通すことによって、中間板におけるランナーの温度維持手段を省略するとともに、固定型側のホットランナーからの樹脂のオープンパージを行えるようにして、熱安定性の悪い材料樹脂による中空物品の射出成形をも可能となし、更には複数のホットランナーにより、複数の金型における半体の一次射出と、半体相互を一体化する二次射出とを同時に行って、同一又は異なった樹脂による中空物品の複数個を同時に成形することができる新たな中空物品の射出成形用金型装置を提供することにある。
【０００７】
【課題を解決するための手段】
上記目的によるこの発明の金型装置は、固定盤側の複数のホットランナーを有するプレートと、そのホットランナープレートに当設して、固定盤に取付けたキャビティを有する固定型と、可動盤に取付けたキャビティを有する可動型と、前後面のキャビティ対向部位にコア型を有し、かつコア型の基端部周囲に二次キャビティ形成用の凸条型を有する中間板と、その中間板を保持して固定型と可動型との間に出入及び進退移動させる中間板操作装置とからなり、上記ホットランナーの一方を固定型のキャビティと、上記中間板を通して可動型のキャビティのランナーとに分岐接続し、他方を固定型の二次キャビティ部位に接続してなる、というものである。
【０００８】
またこの発明の金型装置は、固定盤側の複数のホットランナーを有するプレートと、そのホットランナープレートに当設して、固定盤に並設したキャビティを有する一対の固定型と、可動盤の固定型対向部位に並設したキャビティを有する一対の可動型と、前後面のキャビティ対向部位にコア型を有し、かつコア型の基端部周囲に二次キャビティ形成用の凸条型を有する中間板と、その中間板を保持して固定型と可動型との間に出入及び進退移動させる中間板操作装置とからなり、上記ホットランナーの一方を両固定型のキャビティと、上記中間板を通して両可動型のキャビティのランナーとに分岐接続し、他方を両固定型の二次キャビティ部位に接続して、複数個の中空物品の同時成形を可能としてなる、というものである。
【０００９】
さらにこの発明の金型装置は、固定盤側のホットランナーを有するプレートと、そのホットランナープレートに当設して、固定盤に並設したキャビティを有する一対の固定型と、可動盤の固定型対向部位に並設したキャビティを有する一対の可動型と、固定型と可動型とのパーティング面に形成したコールドランナーと、前後面のキャビティ対向部位にコア型を有し、かつコア型の基端部周囲に二次キャビティ形成用の凸条型を有する中間板と、その中間板を保持して固定型と可動型との間に出入及び進退移動させる中間板操作装置とからなり、上記ホットランナーを固定型のキャビティと、上記中間板を通して可動型のキャビティのランナーとに分岐接続し、上記コールドランナーを固定型の二次キャビティ部位に接続してなるというものであり、上記複数のホットランナー又は上記ホットランナーとコールドランナーからキャビティに射出充填される樹脂は、同一樹脂又は異色樹脂或いは異材質樹脂からなる、というものである。
【００１０】
【発明の実施の形態】
図１〜図１０は、１個の燃料タンク等の中空物品を射出成形する金型装置の実施形態を示すものである。
図中１は型締装置の固定盤、２は同じく可動盤で、タイバー３，３に通して固定盤１に対し進退自在に設けてある。
【００１１】
４は複数のホットランナー５，６を有するホットランナープレートで、上記固定盤１の内側面に止着してある。またホットランナー５，６の各スプルー部には、２台の射出装置のノズル７，８がそれぞれノズルタッチして、ホットランナー５，６に、同一又は異色或いは異材質の樹脂を射出することができるようにしてある。
【００１２】
９は固定型で、上記ホットランナープレート４に当設して、固定盤１の内側に並設してある。１０は割型による可動型で、これらの固定型９及び可動型１０は、開口部が拡径したキャビティ１１，１２を有する。
【００１３】
１３は固定型９と可動型１０との間に設けられた中間板で、金型と同一面積の板体からなり、その前後面のキャビティ対向部位にコア型１４，１５を有し、これらコア１４，１５と上記キャビティ１１，１２とにより、図１１に示す中空物品３０の両半体３１，３２を一次的に成形できるようにしてある。またコア型１４，１５の基端部周囲には、キャビティ開口と嵌合して後に二次キャビティを形成する環状の凸条型１７，１８を有する。
【００１４】
２０は中間板１３の保持枠で、内側にガイド溝を有する両縦枠２１，２１と上下枠２２，２２とを長方形に枠組みしたものからなり、両側上下の支持部材１９，１９をタイバー３，３に摺動自在に嵌挿して、上部面内と固定型９の型面とが重合位置するように、金型部位から下側の機台４０内へと縦長に設けてある。
【００１５】
この保持枠２０の面内には、中間板１３が両側を縦枠２１，２１に嵌め込んで上下に可動自在に設けてあり、その中間板１３の金型外の上端両側に、上枠２２に佇設した左右一対の出入用の油圧シリンダ２４，２４のピストンロッド２４ａ，２４ａが部材２３をもって連結してあつて、ピストンロッド２４ａ，２４ａの伸縮作動により、金型間とその下側の金型外とを往復動するようにしてある。
【００１６】
また保持枠２０の上枠２２の中央部には、固定型９の型取付板９ａの上部に水平に取付けた型開閉用の油圧シリンダ２５のピストンロッド２５ａが連結してあり、そのピストンロッド２５ａの伸縮動作によりタイバー３，３をガイドとして、中間板１３の型開閉が行えるようにしてある。
【００１７】
上記ホットランナー５は、上記固定型９のキャビティ１１側と、上記可動型１０のキャビティ１２側とに接続するように、２つのランナー５１，５２に分岐されており、その一方はキャビティ１１に直に接続され、他方は上記中間板１３に穿設した通孔５２ａを通して、可動型１０のパーティング面に分割形成した上記キャビティ１２のランナー５２ｂに接続してある。
【００１８】
これにより上記ノズル７からホットランナー５に射出された樹脂は、キャビティ１１には直接に、またキャビティ１２には中間板１３を通して射出充填され、通孔５２ａからランナー５２ｂに固化して残った樹脂は、ランナー成形品５３として分離して取除くことができるようにしてある。
【００１９】
上記ホットランナー６は、固定型９の二次キャビティ部位となるキャビティ１１の開口側部に接続され、上記ノズル８からホットランナー６に射出された樹脂が、キャビティ１１に直接に射出充填することができるようにしてある。
上記ホットランナー５，６のいずも、ゲートにはピンゲートが採用され、これにより型開時に切断が容易に行えるようにある。またランナー相互の各接続部位も、下流側の開口を縮径形成して接続部位にずれが生じないようにしてある。
【００２０】
なお２６は突出板、２７は突出ピン、２８，２８は上記可動型１０の開閉シリンダで、可動型１０の型取付板１０ａの上下に一体に設けた型保持板２９，２９に取付けてある。
【００２１】
図５〜図１０は、上記構成の金型装置による中空物品３０の成形工程を順に示すものである。
先ず図１に示す型開状態において、上記油圧シリンダ２５により保持枠２０を中間板１３と共に板面が固定型９の型面に接するところまで後退移動し、キャビティ１１とコア型１４との型閉を行う。
次に可動盤２を前進移動して可動型１０の型面を中間板１３の板面に当接し、キャビティ１２とコア型１５の型閉を行う。
【００２２】
図５は、その型閉状態を示すもので、固定型９と可動型１０との間には中間板１３が介在するため、キャビティ１１，１２は中空物品３０の両半体の形態を有するキャビティに対向形成され、そのキャビティの開口縁内に上記凸条型１７，１８が嵌合位置するとともに、上記分岐ランナー５２が中間板１３の通孔５２ａを介して可動型側のランナー５２ｂと連通し、ホットランナー５からキャビティ１２にも溶融状態で樹脂の射出充填が行えるようになる。
【００２３】
図６はノズル７からホットランナー５に樹脂を射出した状態を示すもので、ホットランナー５に射出された溶融状態の樹脂は分岐ランナー５１，５２から固定型側と可動型側の両方のキャビティ１１，１２に同時に射出充填されて、中空物品３０の半体３１，３２をそれぞれ対向形成する。また開口縁内の凸条型１７，１８により、半体３１，３２の開口縁に近接した外周囲にフランジ３３，３４が突出形成される。
【００２４】
図７は、半体３１，３２の射出成形の一次的な離型状態を示すもので、その離型は先ず、上記可動盤２を後退移動して可動型１０を中間板１３から離し、半体３２をコア型１５から離型してキャビティ１２に残存させる。
次に、図１に示す上記油圧シリンダ２５のピストンロッド２５ａを伸長作動して、保持枠２０を前進移動し、これにより中間板１３を固定型９から離して半体３１をコア型１４から離型し、キャビティ１１に残存させる。
【００２５】
上記コア型１４がキャビティ１１から完全に抜け出た所で、上記油圧シリンダ２４のピストンロッド２４ａを伸長作動して、中間板１３を下方へ移動し、固定型９と可動型１０との間から下側に送り出して除き、両金型が対面するようにセットする。
【００２６】
この離型時に固化した上記通孔５２ａの樹脂は、型開力により分岐ランナー５２の溶融状態の樹脂と、可動側ランナー５２ｂのランナー成形品５３として固化して残った樹脂の両方から切断されて、そのまま通孔５２ａに残る。
また中空物品３０にフイルター等のインサートが必要な場合には、図では省略したが、この型開後に半体３１，３２のいずれか一方又は両方にインサートを行う。
【００２７】
図８は、固定型９と可動型１０の再型閉状態を示すもので、中間板１３を金型外に除いたのち、可動盤２を再前進すると可動型１０が固定型９と型閉して、それらのキャビティ内の半体３１，３２が相互に開口端を接し合うとともに、接合端周囲のフランジ３３，３４の間に、上記凸条型１７，１８の抜き後による二次キャビティ３５が生じる。この二次キャビティ３５の側面には上記ホットランナー６のゲートが開口している。
【００２８】
再型閉後に上記ノズル８からホットランナー６に溶融状態で射出した樹脂は、ゲートから二次キャビティ３５に射出充填されてフランジ３３，３４間を埋め、半体３１，３２の対面接合部を気密にシールすると共に半体３１，３２を不可分一体に接合して、中空物品３０を完成する結合帯３６となる。
【００２９】
図９及び図１０は、中空物品３０の離型状態を示すもので、成形完了後に上記可動盤１０を可動型１２と共に後退移動して、中空物品３０がキャビティ１１から離型するように型開を行う。次に型開位置にて可動型１０の型開を行ってから、上記突出板２６を前進作動して突出ピン２７により中空物品３０を、側部のランナー成形品５３と一緒に可動型１０から同時に突き出して離型する。
【００３０】
また図では省略したが、上記中間板１３の通孔５２ａに残った樹脂は、中空物品３０の離型中にバキュームなどにより除去することができる。したがって、中空物品３０の離型後に、上記油圧シリンダ２４のピストンロッド２４ａを縮小作動して、中間板１３を上部面内に戻し、上記油圧シリンダ２５による保持枠２０の固定型側への移動と、可動盤２の前進移動とによって次回の成形の型閉を行うことができ、これにより連続して中空物品３０の成形を行うことができる。
【００３１】
図１２〜図１４は、上記中空物品３０の複数を同時に射出成形できるこの発明の第２実施形態を示すもので、基本的には上記第１実施形態と同一であり、その相違は上記固定型９と可動型１０の一対を、固定盤１と可動盤２に並設するとともに、その一対の金型にわたり対面位置するように、上記中間板１３を保持枠２０と共に横長に配置し、その中間板１３の２個所のキャビティ対向部位の表裏面に、上記コア型１４，１５と基端部周囲の環状の凸状型１７，１８とを設けたことにある。
【００３２】
この第２実施形態では、図１２に示す型開状態において、第１実施形態と同様に、図示しない油圧シリンダより保持枠２０を中間板１３を後退移動すると、板面が一対の固定型９，９の型面に接して、キャビティ１１とコア型１４とがそれぞれ型閉する。
次に可動盤２を前進移動して一対の可動型１０の型面を中間板１３の板面に当接すると、キャビティ１２とコア型１５とがそれぞれ型閉して、一対の固定型９，９と可動型１０，１０は、中間板１３を挟んで同時に型閉する。
【００３３】
図１３は、この型閉状態と樹脂の射出状態とを半部づつ示すもので、型閉により各キャビティ１１，１２は、上半部に示すように、上記中空物品３０の両半体の形態を有するキャビティに対向形成され、そのキャビティの開口縁内に上記凸条型１４，１５が嵌合位置し、また一対の金型ごとに分岐ランナー５２が中間板１３の通孔５２ａを介して可動型側のランナー５２ｂと連通し、ホットランナー５からキャビティ１２にも樹脂の射出充填が行えるようになる。
【００３４】
そこで型閉後に型締を行って、ノズル７からホットランナー５に溶融状態の樹脂を射出すると、樹脂は分岐ランナー５１，５２から固定型側と可動型側の両方のキャビティ１１，１２に同時に射出充填されて、複数の中空物品３０の半体３１，３２を対向形成する。また開口縁内の凸条型１７，１８により、半体３１，３２の開口縁に近接した外周囲にフランジ３３，３４が突出形成される。
【００３５】
上記半体３１，３２を射出成形したのち、上記第１実施形態と同様に一次的な離型を行い、半体３１，３２を各コア型１４，１５から離型して、両方のキャビティ１１，１２に残存させ、さらに中間板１３を金型間から下側に除いたのち、可動盤２を前進移動すると、一対の固定型９と可動型１０とがそれぞれ同時に型閉する。
【００３６】
この離型時に固化した上記通孔５２ａの樹脂は、型開力により分岐ランナー５２の溶融状態の樹脂と、可動側ランナー５２ｂのランナー成形品５３として固化して残った樹脂の両方から切断されて、そのまま通孔５２ａに残る。
また中空物品３０にフイルター等のインサートが必要な場合には、図では省略したが、この型開後に半体３１，３２のいずれか一方又は両方にインサートを行う。
【００３７】
図１４は、この二次的な型閉状態と樹脂の射出状態とを半部づつ示すもので、一対の固定型９，９と一対の可動型１０，１０の再型閉により、キャビティ内の半体３１，３２が相互に開口端を接し合うとともに、接合端周囲のフランジ３３，３４の間に、上記凸条型１５，１６の抜き後による二次キャビティ３５が生じる。この二次キャビティ３５の側面には上記ホットランナー６のゲートが開口している。
【００３８】
再型閉後に上記ノズル８からホットランナー６に射出した溶融状態の樹脂は、両方の固定型９，９のゲートから、同時に二次キャビティ３５，３５に射出充填されてフランジ３３，３４間を埋め、半体３１，３２の対面接合部を気密にシールすると共に半体３１，３２を不可分一体に接合して中空物品３０を完成する結合帯３６となる。
【００３９】
図１５は、複数の中空物品３０，３０の離型状態を示すもので、成形完了後に上記可動盤２を可動型１０と共に後退移動して、中空物品３０，３０がキャビティ１１，１１から離型するように型開を行う。次に型開位置にて可動型１０の型開を行ってから、上記突出板２６を前進作動して突出ピン２７により中空物品３０，３０を同時に離型する。その中空物品３０，３０の離型中又は離型後に、上記中間板１３の通孔５２ａに残った樹脂の除去をバキュームなどにより行う。
【００４０】
そして、中空物品３０，３０の離型後に、第１実施形態と同様に中間板１３を保持枠２０の上部面内に戻し、その後の保持枠２０の固定型側への移動と、可動盤２の前進移動とによって、工程は次回の成形の型閉に移行する。
したがって、一対の金型における型開閉及び射出充填を一次と二次とに分けて同時に行えることから、金型数に等しい数の中空物品３０を容易に同時成形することができる。
【００４１】
図１６〜図１９に示す第３実施形態は、竪型成形機でも同時に複数個の中空物品３０，３０が成形できるようにしたものである。
この実施形態と第１及び第２実施形態との相違は、固定型９と可動型１０のそれぞれが一対のキャビティ１１，１１及び１２，１２を備え、機台上の型置盤４１と、その上方に昇降自在に設けられた可動盤２とに取付けられる関係上、上記中間板１３の開閉及び移動装置が、固定型９の型取付板９ａの上に縦に設置した点と、上記結合帯３６のランナーが固定型９と可動型１０のパーティング面にコールドランナー６１として設けられている点である。
【００４２】
上記中間板１３の保持枠２０は、内側にガイド溝を有する両枠２１，２１を、下側に横架した逆Ｌ型の受け桟４２の両端に止着して、長方形に枠組みしたものからなり、その両枠２１，２１の外側中央を、型置盤４１上の型取付板９ａに佇設したガイド部材４３，４３に、上下動自在に嵌合するとともに、受け桟４２の中央部に、上記型取付板９ａの固定型側部に立設した開閉用の上記油圧シリンダ２５のピストンロッド２５ａを連結して、片側面内と固定型９の型面とが重合位置するように、金型部位から側方に横長に設けてある。
【００４３】
この保持枠２０の面内に、上記中間板１３が両側を両枠２１，２１に嵌め込んで左右に可動自在に設けてあり、その中間板１３の金型外の両側には出入ロッド４４，４４が側方に長く取付けてある。また受け桟４２の中央部には、出入用の上記油圧シリンダ２４が外方へ長く水平に取付けてあり、そのピストンロッド２４ａに出入ロッド４４，４４にわたり止着した横架材４５が連結してあって、該ピストンロッド２４ａの伸縮により、中間板１３が出入ロッド４４，４４と共に左右に移動して、金型の内外に出入するようにしてある。
【００４４】
上記ホットランナープレート４は、上記固定型９のキャビティ１１側と、上記可動型１０のキャビティ１２側とに接続するように、２つのランナー５１，５２に分岐されたホットランナー５と、固定型９と可動型１０のパーティング面にわたり設けたコールドランナー６１とを有し、そのコールドランナー６１のゲートは両固定型９，９の二次キャビティ部位に接続してある。
【００４５】
このような竪型の金型装置においても、その型開閉及び離型操作は上記第１及び第２実施形態と同様で、一対の金型の並設により同時に複数個の中空物品３０，３０の同時成形を行うことができる。
【００４６】
この第３実施形態では、図１６に示す型開状態において、第１及び第２実施形態と同様に、油圧シリンダ２５より保持枠２０を降下すると、中間板１３の板面が固定型９の型面に接してキャビティ１１とコア型１４とがそれぞれ型閉する。次に可動盤２を降下して一対の可動型１０，１０の型面を中間板１３の板面に当接すると、キャビティ１２とコア型１５とがそれぞれ型閉して、固定型９と可動型１０は中間板１３を挟んで同時に型閉する。
【００４７】
図１８は、この型閉状態と樹脂の射出状態とを半部づつ示すもので、型閉により各キャビティ１１，１２は、左半部に示すように、上記中空物品３０の両半体の形態を有するキャビティに対向形成され、そのキャビティの開口縁内に上記凸条型１７，１８が嵌合位置し、また一対の金型ごとに分岐ランナー５２が中間板１３の通孔５２ａを介して可動型側のランナー５２ｂと連通し、ホットランナー５からキャビティ１２にも樹脂の射出充填が行えるようになる。
【００４８】
このような型閉後に上記ノズル７からホットランナー５に溶融状態の樹脂を射出すると、右半部に示すように、樹脂は分岐ランナー５１，５２から固定型側と可動型側の両方のキャビティ１１，１２に同時に射出充填されて、複数の中空物品３０の半体３１，３２をそれぞれ対向形成する。また開口縁内の凸条型１７．１８により、半体３１，３２の開口縁に近接した外周囲にフランジ３３，３４が突出形成される。
【００４９】
上記半体３１，３２を射出成形したのち、上記第１実施形態と同様に一次的な離型を行うと、図１９に示すように、一対の各半体３１，３２が各コア型１４，１５から離型して、両方のキャビティ１１，１２に残存する。さらに中間板１３を金型間から側方に除いたのち、可動盤２を前進移動すると、図２０に示すように、一対の固定型９と可動型１０とがそれぞれ同時に型閉して、パーティング面に上記コールドランナー６１が形成される。
【００５０】
図１９は、この二次的な型閉状態と樹脂の射出状態とを半部づつ示すもので、固定型９と可動型１０の再型閉により、キャビティ内の半体３１，３２が相互に開口端を接し合うとともに、接合端周囲のフランジ３３，３４の間に、上記凸条型１７，１８の抜き後による二次キャビティ３５が生じる。この二次キャビティ３５の側面には上記コールドランナー６１のゲートが開口している。
【００５１】
再型閉後に上記ノズル８からコールドランナー６１に射出した溶融状態の樹脂は、両方の固定型９，９のゲートから、同時に二次キャビティ３５，３５に射出充填されてフランジ３３，３４間を埋め、半体３１，３２の対面接合部を気密にシールすると共に半体３１，３２を不可分一体に接合して中空物品３０を完成する結合帯３６となる。
【００５２】
図２１は、複数の中空物品３０，３０の離型状態を示すもので、成形完了後に上記可動盤２を可動型１０と共に上昇移動して、中空物品３０，３０がキャビティ１１，１１から離型するように型開を行い。次に型開位置にて可動型１０の型開を行ってから、上記突出板２６を前進作動して突出ピン２７により中空物品３０，３０を同時に突き出すと、中空物品３０と一緒に上記ランナー成形品５３とパーティング面にて形成されたランナー成形品６２とが離型する。
【００５３】
そして、中空物品３０，３０の離型後に、第１実施形態と同様に中間板１３を保持枠２０の上部面内に戻し、その後の保持枠２０の固定型側への移動と、可動盤２の前進移動とによって、工程は次回の成形の型閉に移行する。
したがって、竪型においても一対の金型における型開閉及び射出充填を一次と二次とに分けて同時に行えるので、金型数に等しい数の中空物品３０を容易に同時成形することがてきる。
【００５４】
上述のように、この発明では樹脂の射出充填を中空物品の半体成形用と、半体結合用として個々にキャビティへの樹脂の射出充填を可能に構成したことから、そこに用いられる樹脂も、同一樹脂に限定されず、異色樹脂又は異材質樹脂とすることができ、また中間板及び可動型側のランナーをコールドランナーとしたことによって、樹脂のオープンパージが可能となり、熱安定性の悪い材料樹脂における対応も容易となって材料樹脂の利用範囲が広がる。
【００５５】
さらにまた、中間板を貫通して固定型側から可動型側へ樹脂を射出充填できるようにしたので、中間板を金型側方へ移動して出入を行うものであっても、ノズルを常時タッチさせたまま成形を行うことができ、金型数を増して同時に複数個の中空物品の成形も容易に行えることから生産性が向上する。また個々のキャビティ及びコア型が専用となるため、半体成形樹脂と結合樹脂が同一材料樹脂であるときには、形態の異なる中空成形品のファミリー取りへの展開も可能となる。
【図面の簡単な説明】
【図１】この発明に係わる中空物品の射出成形用金型装置の型開時における縦断側面図である。
【図２】同上の平断面図である。
【図３】図１Ａ−Ａ線における固定型側の正面図である。
【図４】同じくＡ−Ａ線における可動型側の正面図である。
【図５】中空物品の半体成形状態を示す略示縦断側面図である。
【図６】同上の略示平断面図である。
【図７】中空物品の半体成形後の型開状態を示す略示平断面図である。
【図８】再型閉による二次キャビティの形成状態を示す略示平断面図である。
【図９】中空物品完成後の離型状態を示す略示平断面図である。
【図１０】同上の略示縦断側面図である。
【図１１】射出成形された中空物品の１実施形態の縦断面図である。
【図１２】複数の中空物品の同時成形が可能なこの発明に係る金型装置の型開時における略示平断面図である。
【図１３】中空物品の半体成形状態を示す略示平断面図である。
【図１４】再型閉により形成された二次キャビティと二次射出の両方を示す平断面図である。
【図１５】型開後の中空物品の離型状態を示す略示平断面図である。
【図１６】竪型成形機に適用可能なこの発明に係る金型装置の型開時における縦断側面図である。
【図１７】同じく中間板開放後の固定盤側の平面図である。
【図１８】中空物品の半体成形状態を示す略示縦断正面図である。
【図１９】中空物品の半体成形後の型開状態を示す略示縦正面図である。
【図２０】再型閉により形成された二次キャビティと二次射出の両方を示す縦断正面図である。
【図２１】型開後の中空物品の離型状態を示す略示縦断正面図である。
【符号の説明】
１固定盤
２可動盤
３タイバー
４ホットランナープレート
５，６ホットランナー
７，８ノズル
９固定型
１０可動型
１１，１２キャビティ
１３中間板
１４，１５コア型
１７，１８二次キャビティ成形用の凸条型
２０中間板の保持枠
２４中間板出入用の油圧シリンダ
２５中間板開閉用の油圧シリンダ
３０中空物品
３１，３２半体
３３，３４フランジ
３５二次キャビティ
３６結合帯
５１，５２分岐ランナー
５２ａ中間板の通孔
５２ｂ可動型のキャビティのランナー
５３ランナー成形品
６１パーティング面のコールドランナー
６２ランナー成形品[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold apparatus for injection-molding a hollow article by inserting and removing an intermediate plate provided between a fixed mold and a movable mold and opening and closing the mold.
[0002]
[Problems to be solved by the invention]
A conventional mold device used for injection molding a hollow article such as a fuel tank includes a core mold and a convex for forming a secondary cavity between a fixed mold on a fixed board side and a fixed mold on a movable board side. An intermediate mold such as a core mold and a rotary mold having a strip mold is provided so as to be freely accessible, and a hot runner drilled in the intermediate mold is branched into both a fixed mold and a movable mold, and a pair of halves is primarily injected. After molding, the fixed mold and the movable mold after removing the intermediate mold are in direct contact with each other by direct mold closing, and the secondary cavity created around the contact area is filled with resin by secondary injection and hollow. It is configured to complete an article.
[0003]
In such a mold apparatus, since the resin for half-mold molding is injected and filled into both the fixed mold and the movable mold from inside the intermediate mold, it is necessary to maintain the temperature of the runner in the intermediate mold as a hot runner. There is. In addition, since the intermediate mold repeatedly enters and exits each time it is molded, it is not easy to apply temperature maintaining means to such an intermediate mold, and it is not possible to open purge the resin. It was difficult to adapt to.
[0004]
In the case of a mold device that slides in and out of an intermediate mold with a core, the injection device is nozzle-touched to the core, so the nozzle touch must be repeated for each molding. Is also likely to occur. In addition, since one injection device is moved up and down to perform primary injection and secondary injection of resin, the molding operation is complicated, and it is not possible to simultaneously mold a plurality of hollow articles, and the material resin is limited to the same material. Have problems such as
[0005]
On the other hand, in the mold apparatus which moves the rotary mold in and out as an intermediate mold, the rotary mold can be alternately moved in and out between the pair of fixed molds and the movable mold by reciprocating rotation, so that the inside of the rotary mold is changed. The hot runner of the fixed type is alternately connected to the hot runners branched to both fixed types on the fixed type side, so that the nozzles can always be touched to the hot runner on the fixed type side. The switching is performed alternately by reciprocating rotation of the rotary mold, and because of the structure of performing the primary injection and the secondary injection of the resin, even those having a pair of fixed mold and movable mold, it is possible to simultaneously perform the plural hollow articles. There are problems that molding cannot be performed and that the material resin is limited to the same material.
[0006]
The present invention has been conceived in order to solve the problems in the above-described conventional mold apparatus, and has an object to provide a plurality of hot runners, one of which is freely movable between a fixed mold and a movable mold. By passing through the intermediate plate, the means for maintaining the temperature of the runner in the intermediate plate is omitted, and open purging of the resin from the hot runner on the fixed mold side can be performed. Molding is also possible, and furthermore, by using multiple hot runners, the primary injection of halves in multiple dies and the secondary injection that integrates the halves are performed simultaneously, and hollows of the same or different resins are used. An object of the present invention is to provide a new mold apparatus for injection molding of a hollow article capable of simultaneously molding a plurality of articles.
[0007]
[Means for Solving the Problems]
A mold apparatus according to the present invention for the above object has a plate having a plurality of hot runners on a fixed platen side, a fixed die having a cavity attached to the hot runner plate and fixed to the fixed platen, and a fixed die attached to a movable platen. Plate with a movable mold having a cavity, a core mold at front and rear surfaces facing the cavity, and a convex strip around the base end of the core mold for forming a secondary cavity, and holding the intermediate plate And an intermediate plate operating device for moving in and out and moving back and forth between the fixed mold and the movable mold. One of the hot runners is defined as a fixed mold cavity. ,the above Movable mold cavity through intermediate plate Runner And the other is connected to the fixed type secondary cavity portion.
[0008]
In addition, the mold apparatus of the present invention includes a plate having a plurality of hot runners on a fixed platen side, a pair of fixed dies having a cavity arranged in parallel with the fixed plate attached to the hot runner plate, and a movable platen. A pair of movable dies having cavities juxtaposed to the fixed mold opposing parts, a core mold at the front and rear cavities opposing parts, and a ridge for forming a secondary cavity around the base end of the core mold. An intermediate plate, and an intermediate plate operating device that holds the intermediate plate and moves in and out and between a fixed mold and a movable mold, and one of the hot runners is provided with a cavity of both fixed molds. ,the above Both movable mold cavities through intermediate plate Runner And the other is connected to the secondary cavities of both fixed dies to enable simultaneous molding of a plurality of hollow articles.
[0009]
Further, the mold apparatus of the present invention includes a plate having a hot runner on the fixed platen side, a pair of fixed dies having cavities abutting on the hot runner plate and juxtaposed to the fixed platen, and a fixed die for the movable platen. A pair of movable dies having cavities juxtaposed at opposing portions, a cold runner formed on the parting surfaces of the fixed die and the movable die, and a core die at the cavity opposing portions on the front and rear surfaces, and An intermediate plate having a convex ridge for forming a secondary cavity around an end thereof; and an intermediate plate operating device for holding the intermediate plate and moving in and out and moving between a fixed die and a movable die. Runner fixed cavity and movable cavity through the intermediate plate With the runner Branch and connect the cold runner to the fixed secondary cavity. Part The plurality of hot runners or the resin injected and filled into the cavity from the hot runner and the cold runner is made of the same resin, a different color resin or a different material resin.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 10 show an embodiment of a mold apparatus for injection molding a hollow article such as one fuel tank.
In the figure, reference numeral 1 denotes a fixed plate of a mold clamping device, and 2 denotes a movable plate similarly, which is provided to be able to advance and retreat with respect to the fixed plate 1 through tie bars 3 and 3.
[0011]
Reference numeral 4 denotes a hot runner plate having a plurality of hot runners 5 and 6, which are fixed to the inner surface of the fixed platen 1. The nozzles 7 and 8 of the two injection devices respectively touch the sprue portions of the hot runners 5 and 6 to inject the same or different color or different material resin into the hot runners 5 and 6. I can do it.
[0012]
Reference numeral 9 denotes a fixed type, which is provided on the hot runner plate 4 and juxtaposed inside the fixed platen 1. Reference numeral 10 denotes a movable mold that is a split mold. The fixed mold 9 and the movable mold 10 have cavities 11 and 12 whose diameters are enlarged.
[0013]
Reference numeral 13 denotes an intermediate plate provided between the fixed die 9 and the movable die 10, which is made of a plate having the same area as the die, and has core dies 14, 15 at front and rear surfaces of the die opposite to the cavity. The halves 31, 32 of the hollow article 30 shown in FIG. 11 can be primarily formed by the cavities 11, 12 and the cavities 11, 12. Around the base ends of the core molds 14 and 15, there are provided annular convex molds 17 and 18 which are fitted into the cavity openings to form a secondary cavity later.
[0014]
Reference numeral 20 denotes a holding frame for the intermediate plate 13, which is formed by forming both vertical frames 21 and 21 having guide grooves inside and upper and lower frames 22 and 22 in a rectangular shape. 3 is slidably fitted to the upper surface and the mold surface of the fixed mold 9 is provided vertically long from the mold portion into the lower machine base 40 so that the mold surface is overlapped.
[0015]
In the plane of the holding frame 20, an intermediate plate 13 is provided movably up and down by fitting both sides into vertical frames 21 and 21, and an upper frame 22 is provided on both upper ends of the intermediate plate 13 outside the mold. The piston rods 24a, 24a of a pair of left and right hydraulic cylinders 24, 24, which are located at the left and right sides, are connected by a member 23, and the expansion and contraction of the piston rods 24a, 24a causes the space between the dies and the lower metal. It reciprocates with the outside of the mold.
[0016]
At the center of the upper frame 22 of the holding frame 20, a piston rod 25a of a hydraulic cylinder 25 for opening and closing the die, which is horizontally mounted on the upper part of the die mounting plate 9a of the fixed die 9, is connected. The intermediate plate 13 can be opened and closed by using the tie bars 3 and 3 as guides by the expansion and contraction operation of.
[0017]
The hot runner 5 is branched into two runners 51 and 52 so as to be connected to the cavity 11 side of the fixed mold 9 and the cavity 12 side of the movable mold 10, one of which is directly connected to the cavity 11. The other is a through hole 52a formed in the intermediate plate 13. Through the cavity 12 formed separately on the parting surface of the movable mold 10. Connected to runner 52b.
[0018]
As a result, the resin injected from the nozzle 7 into the hot runner 5 is injected and filled into the cavity 11 directly and through the intermediate plate 13 into the cavity 12, and the resin solidified from the through hole 52a into the runner 52b is removed. And the runner molding 53 can be separated and removed.
[0019]
The hot runner 6 is connected to the opening side of the cavity 11 serving as a secondary cavity portion of the fixed mold 9, and the resin injected into the hot runner 6 from the nozzle 8 can directly inject and fill the cavity 11. I can do it.
In each of the hot runners 5 and 6, a pin gate is employed as a gate, so that cutting can be easily performed when the mold is opened. Also, the connecting portions of the runners are formed such that the openings on the downstream side are reduced in diameter so that the connecting portions do not shift.
[0020]
Reference numeral 26 denotes a protruding plate, 27 denotes a protruding pin, and 28, 28 denote opening / closing cylinders of the movable die 10, which are mounted on die holding plates 29, 29 provided integrally above and below a die mounting plate 10a of the movable die 10.
[0021]
FIGS. 5 to 10 show steps of forming the hollow article 30 by the mold apparatus having the above-described configuration in order.
First, in the mold open state shown in FIG. 1, the holding frame 20 is moved backward together with the intermediate plate 13 by the hydraulic cylinder 25 until the plate surface comes into contact with the mold surface of the fixed mold 9, and the mold closing of the cavity 11 and the core mold 14 is closed. I do.
Next, the movable platen 2 is moved forward to bring the mold surface of the movable mold 10 into contact with the plate surface of the intermediate plate 13 to close the mold of the cavity 12 and the core mold 15.
[0022]
FIG. 5 shows the mold closed state. Since the intermediate plate 13 is interposed between the fixed mold 9 and the movable mold 10, the cavities 11 and 12 have the halves of the hollow article 30. The protruding ridges 17 and 18 are fitted in the opening edges of the cavity, and the branch runner 52 communicates with the runner 52b on the movable mold side through the through hole 52a of the intermediate plate 13. In addition, the resin can be injected and filled from the hot runner 5 to the cavity 12 in a molten state.
[0023]
FIG. 6 shows a state in which the resin is injected from the nozzle 7 to the hot runner 5. The molten resin injected into the hot runner 5 is supplied from the branch runners 51 and 52 to the cavities 11 on both the fixed mold side and the movable mold side. , 12 are simultaneously injected and filled to form the opposite halves 31, 32 of the hollow article 30 respectively. Further, the flanges 33 and 34 are formed so as to protrude around the outer edges of the halves 31 and 32 by the convex strips 17 and 18 in the opening edges.
[0024]
FIG. 7 shows a primary mold release state of the injection molding of the halves 31, 32. First, the movable platen 2 is moved backward to separate the movable die 10 from the intermediate plate 13, and the mold is released. The body 32 is released from the core mold 15 and remains in the cavity 12.
Next, the piston rod 25a of the hydraulic cylinder 25 shown in FIG. 1 is extended to move the holding frame 20 forward, whereby the intermediate plate 13 is separated from the fixed mold 9 and the half body 31 is separated from the core mold 14. It is molded and left in the cavity 11.
[0025]
When the core mold 14 has completely come out of the cavity 11, the piston rod 24a of the hydraulic cylinder 24 is extended to move the intermediate plate 13 downward, and the lower part is moved from between the fixed mold 9 and the movable mold 10. Remove it to the side and set it so that both molds face each other.
[0026]
The resin in the through hole 52a solidified at the time of the mold release is cut off from both the resin in the molten state of the branch runner 52 and the resin solidified as the runner molded product 53 of the movable runner 52b by the mold opening force. Remain in the through hole 52a as it is.
In the case where an insert such as a filter is required for the hollow article 30, although not shown in the drawing, the insert is inserted into one or both of the halves 31 and 32 after the mold is opened.
[0027]
FIG. 8 shows a closed state of the fixed mold 9 and the movable mold 10 in a closed state. After the intermediate plate 13 is removed from the outside of the mold and the movable platen 2 is advanced again, the movable mold 10 is closed with the fixed mold 9 and the closed mold. Then, the halves 31, 32 in these cavities contact each other at the open ends, and between the flanges 33, 34 around the joint ends, the secondary cavities 35 formed by removing the ridges 17, 18 are removed. Occurs. The gate of the hot runner 6 is opened on the side surface of the secondary cavity 35.
[0028]
The resin injected from the nozzle 8 into the hot runner 6 in a molten state after the remolding is closed is injected and filled into the secondary cavity 35 from the gate to fill the space between the flanges 33 and 34 and hermetically seal the facing joints of the halves 31 and 32. And the halves 31, 32 are inseparably joined together to form a joining band 36 for completing the hollow article 30.
[0029]
9 and 10 show the mold release state of the hollow article 30. After the molding is completed, the movable plate 10 is moved back together with the movable mold 12, and the mold is opened so that the hollow article 30 is released from the cavity 11. I do. Next, after the movable mold 10 is opened at the mold open position, the protruding plate 26 is moved forward and the hollow article 30 is removed from the movable mold 10 together with the runner molded product 53 on the side by the protruding pin 27. At the same time protrude and release.
[0030]
Although not shown in the drawing, the resin remaining in the through hole 52a of the intermediate plate 13 can be removed by vacuum or the like during the release of the hollow article 30. Therefore, after the hollow article 30 is released, the piston rod 24a of the hydraulic cylinder 24 is contracted to return the intermediate plate 13 to the upper surface, and the hydraulic cylinder 25 moves the holding frame 20 to the fixed mold side. By moving the movable platen 2 forward, the mold for the next molding can be closed, whereby the hollow article 30 can be continuously molded.
[0031]
FIGS. 12 to 14 show a second embodiment of the present invention in which a plurality of the hollow articles 30 can be injection-molded at the same time. The second embodiment is basically the same as the first embodiment. A pair of the movable plate 9 and the movable die 10 are arranged side by side on the fixed platen 1 and the movable platen 2, and the intermediate plate 13 is horizontally arranged along with the holding frame 20 so as to face each other over the pair of dies. That is, the core dies 14 and 15 and the annular convex dies 17 and 18 around the base end are provided on the front and back surfaces of the two cavity opposing portions of the plate 13.
[0032]
In the second embodiment, as in the first embodiment, when the holding frame 20 is moved backward from the hydraulic cylinder (not shown) through the intermediate plate 13 in the mold open state shown in FIG. The cavity 11 and the core mold 14 are closed respectively in contact with the mold surface 9.
Next, when the movable platen 2 is moved forward and the mold surfaces of the pair of movable dies 10 abut against the plate surfaces of the intermediate plate 13, the cavities 12 and the core dies 15 are closed respectively, and the pair of fixed dies 9 and The mold 9 and the movable dies 10, 10 are simultaneously closed with the intermediate plate 13 interposed therebetween.
[0033]
FIG. 13 shows the mold closed state and the resin injection state by half. By closing the mold, the cavities 11 and 12 are in the form of both halves of the hollow article 30 as shown in the upper half. The ridges 14 and 15 are fitted in the opening edges of the cavity, and the branch runner 52 is movable through the through hole 52a of the intermediate plate 13 for each pair of dies. The hot runner 5 communicates with the mold-side runner 52b so that the cavity 12 can be injected and filled with resin.
[0034]
Then, when the mold is closed and the mold is closed and the molten resin is injected from the nozzle 7 into the hot runner 5, the resin is simultaneously injected from the branch runners 51 and 52 into the cavities 11 and 12 on both the fixed mold side and the movable mold side. It is filled to form the halves 31, 32 of the plurality of hollow articles 30 facing each other. Further, the flanges 33 and 34 are formed so as to protrude around the outer edges of the halves 31 and 32 by the convex strips 17 and 18 in the opening edges.
[0035]
After the injection molding of the halves 31, 32, the primary mold release is performed in the same manner as in the first embodiment, and the halves 31, 32 are released from the core dies 14, 15, so that both cavities 11 are formed. , 12 and the intermediate plate 13 is removed from below between the dies, and then the movable platen 2 is moved forward, whereby the pair of fixed dies 9 and movable dies 10 are closed at the same time.
[0036]
The resin in the through hole 52a solidified at the time of the mold release is cut off from both the resin in the molten state of the branch runner 52 and the resin solidified as the runner molded product 53 of the movable runner 52b by the mold opening force. Remain in the through hole 52a as it is.
In the case where an insert such as a filter is required for the hollow article 30, although not shown in the drawing, the insert is inserted into one or both of the halves 31 and 32 after the mold is opened.
[0037]
FIG. 14 shows the secondary mold closed state and the resin injection state by half, and the pair of fixed molds 9 and 9 and the pair of movable molds 10 and 10 are closed again to close the cavity. The halves 31, 32 contact each other at their open ends, and a secondary cavity 35 is formed between the flanges 33, 34 around the joint ends after the removal of the ridges 15, 16. The gate of the hot runner 6 is opened on the side surface of the secondary cavity 35.
[0038]
The molten resin injected from the nozzle 8 into the hot runner 6 after the remolding is closed is injected and filled into the secondary cavities 35 and 35 simultaneously from the gates of both the fixed dies 9 and 9 to fill the space between the flanges 33 and 34. In addition, the facing joints of the halves 31 and 32 are hermetically sealed, and the halves 31 and 32 are integrally joined to form a joining band 36 for completing the hollow article 30.
[0039]
FIG. 15 shows a state in which the plurality of hollow articles 30, 30 are released. After the molding is completed, the movable platen 2 is moved back together with the movable die 10, and the hollow articles 30, 30 are released from the cavities 11, 11. Open the mold as you would. Next, after the movable mold 10 is opened at the mold opening position, the protruding plate 26 is moved forward and the hollow articles 30, 30 are simultaneously released by the protruding pins 27. During or after the release of the hollow articles 30, 30, the resin remaining in the through holes 52a of the intermediate plate 13 is removed by vacuum or the like.
[0040]
Then, after releasing the hollow articles 30, 30, the intermediate plate 13 is returned to the upper surface of the holding frame 20 in the same manner as in the first embodiment. The process moves to the next mold closing by the forward movement of the mold.
Therefore, the mold opening / closing and the injection filling in the pair of molds can be simultaneously performed separately for the primary and the secondary, so that the hollow articles 30 equal in number to the molds can be easily molded simultaneously.
[0041]
The third embodiment shown in FIGS. 16 to 19 is such that a plurality of hollow articles 30, 30 can be simultaneously molded by a vertical molding machine.
The difference between this embodiment and the first and second embodiments is that each of the fixed mold 9 and the movable mold 10 has a pair of cavities 11, 11 and 12, 12, and a mold table 41 on a machine base and The opening and closing and moving device of the intermediate plate 13 is vertically installed on the mold mounting plate 9a of the fixed die 9 because of being attached to the movable platen 2 which can be moved up and down. 36 in that runners 36 are provided as cold runners 61 on the parting surfaces of the fixed mold 9 and the movable mold 10.
[0042]
The holding frame 20 of the intermediate plate 13 is formed by fixing both frames 21 and 21 having a guide groove on the inner side to both ends of an inverted L-shaped receiving bar 42 laid on the lower side to form a rectangular frame. The outer central portions of the frames 21 and 21 are vertically movably fitted to guide members 43 and 43 standing on the mold mounting plate 9 a on the mold table 41, and are fitted to the central portion of the receiving bar 42. By connecting the piston rod 25a of the hydraulic cylinder 25 for opening and closing, which is erected on the fixed mold side of the mold mounting plate 9a, the metal is fixed so that the inside of one side and the mold surface of the fixed mold 9 overlap each other. It is provided horizontally sideways from the mold part.
[0043]
In the plane of the holding frame 20, the intermediate plate 13 is provided so as to be movable left and right by fitting both sides into the two frames 21 and 21. 44 is long attached to the side. At the center of the receiving bar 42, the hydraulic cylinder 24 for access is long and horizontally mounted outward, and a horizontal member 45 fixed to the piston rod 24a over the access rods 44 is connected to the piston rod 24a. The expansion and contraction of the piston rod 24a causes the intermediate plate 13 to move to the left and right together with the in / out rods 44, 44 so as to enter and exit the mold.
[0044]
The hot runner plate 4 includes a hot runner 5 branched into two runners 51 and 52 so as to be connected to the cavity 11 side of the fixed mold 9 and the cavity 12 side of the movable mold 10. And a cold runner 61 provided over the parting surface of the movable mold 10. The gate of the cold runner 61 is connected to the secondary cavity portion of both fixed molds 9, 9.
[0045]
In such a vertical mold apparatus, the mold opening / closing and mold releasing operations are the same as those in the first and second embodiments, and a plurality of hollow articles 30, 30 are simultaneously formed by arranging a pair of molds. Simultaneous molding can be performed.
[0046]
In the third embodiment, as in the first and second embodiments, when the holding frame 20 is lowered from the hydraulic cylinder 25 in the mold open state shown in FIG. The cavity 11 and the core mold 14 are closed in contact with the surface. Next, when the movable platen 2 is lowered to bring the mold surfaces of the pair of movable dies 10 and 10 into contact with the plate surface of the intermediate plate 13, the cavity 12 and the core mold 15 are closed respectively, and the fixed mold 9 and the movable mold 9 are movable. The mold 10 is simultaneously closed with the intermediate plate 13 interposed therebetween.
[0047]
FIG. 18 shows the mold closing state and the resin injection state by half, and the molds close each cavity 11, 12 as shown in the left half to form both halves of the hollow article 30. The ridges 17 and 18 are fitted in the opening edges of the cavity, and the branch runner 52 is movable through the through hole 52a of the intermediate plate 13 for each pair of dies. The hot runner 5 communicates with the mold-side runner 52b so that the cavity 12 can be injected and filled with resin.
[0048]
When the molten resin is injected from the nozzle 7 into the hot runner 5 after the mold is closed, as shown in the right half, the resin flows from the branch runners 51 and 52 into the cavities 11 on both the fixed mold side and the movable mold side. , 12 are simultaneously injected and filled to form the opposite halves 31, 32 of the plurality of hollow articles 30, respectively. In addition, the flanges 33 and 34 are formed so as to protrude from the outer periphery of the halves 31 and 32 near the opening edges by the ridges 17.18 in the opening edges.
[0049]
After the first and second halves 31 and 32 are injection-molded, primary release is performed in the same manner as in the first embodiment. As shown in FIG. After being released from the mold 15, it remains in both the cavities 11 and 12. Further, when the movable platen 2 is moved forward after the intermediate plate 13 is removed from the side of the mold, the fixed mold 9 and the movable mold 10 are simultaneously closed as shown in FIG. The cold runner 61 is formed on the running surface.
[0050]
FIG. 19 shows the secondary mold closed state and the resin injection state by half, and the fixed mold 9 and the movable mold 10 are remolded so that the half bodies 31 and 32 in the cavity are mutually reciprocated. While the open ends are in contact with each other, a secondary cavity 35 is formed between the flanges 33 and 34 around the joined ends after the protrusions 17 and 18 are removed. The gate of the cold runner 61 is opened on the side surface of the secondary cavity 35.
[0051]
The molten resin injected into the cold runner 61 from the nozzle 8 after the remolding is closed is simultaneously injected and filled into the secondary cavities 35 and 35 from the gates of both the fixed dies 9 and 9 to fill the space between the flanges 33 and 34. In addition, the facing joints of the halves 31 and 32 are hermetically sealed, and the halves 31 and 32 are integrally joined to form a joining band 36 for completing the hollow article 30.
[0052]
FIG. 21 shows a state in which the plurality of hollow articles 30, 30 are released. After the molding is completed, the movable platen 2 is moved up together with the movable die 10, and the hollow articles 30, 30 are released from the cavities 11, 11. Open the mold as you do. Next, after the movable mold 10 is opened at the mold opening position, the protruding plate 26 is moved forward and the hollow articles 30, 30 are simultaneously protruded by the protruding pins 27, thereby forming the runner together with the hollow articles 30. The product 53 and the runner molded product 62 formed on the parting surface are released.
[0053]
Then, after releasing the hollow articles 30, 30, the intermediate plate 13 is returned to the upper surface of the holding frame 20 in the same manner as in the first embodiment. The process moves to the next mold closing by the forward movement of the mold.
Therefore, even in the vertical mold, the mold opening / closing and injection filling in the pair of molds can be simultaneously performed separately for primary and secondary, so that the same number of hollow articles 30 as the number of molds can be easily molded at the same time.
[0054]
As described above, according to the present invention, the injection filling of the resin is configured for the half molding of the hollow article, and the resin can be individually injected and filled into the cavity for the half body joining. However, the resin is not limited to the same resin, but can be made of a different color resin or a different material resin. In addition, since the intermediate plate and the runner on the movable mold side are cold runners, open purging of the resin becomes possible, resulting in poor thermal stability. It is easy to deal with the material resin, and the range of use of the material resin is expanded.
[0055]
Furthermore, since the resin can be injected and filled from the fixed mold side to the movable mold side by penetrating the intermediate plate, even if the intermediate plate is moved to the side of the mold to enter and exit, the nozzle is always kept Since the molding can be performed while keeping the touch, the number of molds can be increased and a plurality of hollow articles can be easily molded at the same time, thereby improving the productivity. In addition, since the individual cavities and core molds are dedicated, when the half-molded resin and the binding resin are the same material resin, it is also possible to develop a hollow molded product having a different form into a family.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of a mold apparatus for injection molding a hollow article according to the present invention when the mold is opened.
FIG. 2 is a plan sectional view of the same.
FIG. 3 is a front view of the fixed mold side along the line AA in FIG. 1;
FIG. 4 is a front view of the movable mold side along line AA.
FIG. 5 is a schematic longitudinal sectional side view showing a half-molded state of a hollow article.
FIG. 6 is a schematic plan sectional view of the same.
FIG. 7 is a schematic plan cross-sectional view showing a mold opened state after half molding of a hollow article.
FIG. 8 is a schematic plan sectional view showing a state in which a secondary cavity is formed by re-mold closing.
FIG. 9 is a schematic cross-sectional plan view showing a release state after completion of the hollow article.
FIG. 10 is a schematic vertical sectional side view of the same.
FIG. 11 is a longitudinal sectional view of one embodiment of an injection-molded hollow article.
FIG. 12 is a schematic cross-sectional plan view of a mold device according to the present invention capable of simultaneously molding a plurality of hollow articles when the mold is opened.
FIG. 13 is a schematic plan sectional view showing a half-shaped state of a hollow article.
FIG. 14 is a plan sectional view showing both a secondary cavity and a secondary injection formed by remolding.
FIG. 15 is a schematic plan cross-sectional view showing a released state of the hollow article after the mold is opened.
FIG. 16 is a vertical sectional side view of a mold apparatus according to the present invention applicable to a vertical molding machine when the mold is opened.
FIG. 17 is a plan view of the fixed platen side after the opening of the intermediate plate.
FIG. 18 is a schematic longitudinal sectional front view showing a half-molded state of a hollow article.
FIG. 19 is a schematic vertical front view showing a mold opened state after half-molding of a hollow article.
FIG. 20 is a longitudinal sectional front view showing both a secondary cavity formed by re-mold closing and a secondary injection.
FIG. 21 is a schematic longitudinal sectional front view showing a release state of the hollow article after the mold is opened.
[Explanation of symbols]
1 fixed board
2 movable board
3 Tie bar
4 Hot runner plate
5,6 hot runner
7,8 nozzle
9 fixed type
10 movable type
11,12 cavities
13 Intermediate plate
14,15 core type
17,18 Convex strip for forming secondary cavity
20 Holding frame for intermediate plate
24 Hydraulic cylinder for entering and exiting intermediate plate
25 Hydraulic cylinder for opening and closing intermediate plate
30 hollow articles
31, 32 half body
33, 34 flange
35 Secondary Cavity
36 bonding band
51,52 Branch runner
52a Through hole of intermediate plate
52b movable type Of the cavity runner
53 runner molding
61 Cold Runner on Parting Surface
62 runner molding

Claims

A plate having a plurality of hot runners on the fixed board side,
A fixed mold having a cavity attached to the fixed board, attached to the hot runner plate,
A movable mold having a cavity attached to the movable board,
An intermediate plate having a core mold at the cavity facing portions on the front and rear surfaces, and having a ridge mold for forming a secondary cavity around the base end of the core mold,
An intermediate plate operating device that holds the intermediate plate, moves in and out and moves between a fixed mold and a movable mold,
A hollow article characterized in that one of the hot runners is branched and connected to a fixed mold cavity and a movable mold runner through the intermediate plate, and the other is connected to a fixed mold secondary cavity portion. Molding equipment for injection molding.

A plate having a plurality of hot runners on the fixed board side,
A pair of fixed molds having cavities arranged in parallel with the fixed plate, abutting on the hot runner plate,
A pair of movable dies having cavities juxtaposed to the fixed mold opposing portions of the movable platen,
An intermediate plate having a core mold at the cavity facing portions on the front and rear surfaces, and having a ridge mold for forming a secondary cavity around the base end of the core mold,
An intermediate plate operating device that holds the intermediate plate, moves in and out and moves between a fixed mold and a movable mold,
The one and two fixed-type cavity of a hot runner branches connected to the above through the intermediate plate of the two movable mold cavity runner connects the other to the secondary cavity segments of both fixed, a plurality of hollow articles A mold apparatus for injection molding of hollow articles, characterized in that it is possible to simultaneously mold the same.

A plate having a hot runner on the fixed platen side,
A pair of fixed molds having cavities arranged in parallel with the fixed plate, abutting on the hot runner plate,
A pair of movable dies having cavities juxtaposed to the fixed mold opposing portions of the movable platen,
A cold runner formed on the fixed and movable parting surfaces,
An intermediate plate having a core mold at the cavity facing portions on the front and rear surfaces, and having a ridge mold for forming a secondary cavity around the base end of the core mold,
An intermediate plate operating device that holds the intermediate plate, moves in and out and moves between a fixed mold and a movable mold,
Hollow, wherein the said hot runner to a fixed cavity, branches connected to and movable mold cavity runner through the intermediate plate, that formed by connecting the cold runner in the secondary cavitation I portion position of the fixed Mold device for injection molding of articles.

The hollow resin according to any one of claims 1 to 3, wherein the resin injected into the cavity from the plurality of hot runners or the hot runner and the cold runner is made of the same resin or a different color resin or a different material resin. Mold device for injection molding of articles.