JP3922756B2 - Method and apparatus for press molding glass molded article - Google Patents

Method and apparatus for press molding glass molded article Download PDF

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Publication number
JP3922756B2
JP3922756B2 JP09025197A JP9025197A JP3922756B2 JP 3922756 B2 JP3922756 B2 JP 3922756B2 JP 09025197 A JP09025197 A JP 09025197A JP 9025197 A JP9025197 A JP 9025197A JP 3922756 B2 JP3922756 B2 JP 3922756B2
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Japan
Prior art keywords
mold
shaft
glass
molded product
press molding
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JP09025197A
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JPH10265229A (en
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征夫 榎本
光昭 若林
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Ohara Inc
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Ohara Inc
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Priority to MYPI9801270 priority patent/MY121305A/en
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    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/02Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing in machines with rotary tables

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、ガラス成形品をプレス成形する方法および装置に関する。
【0002】
【従来の技術】
間欠回転する回転テーブル上に、下型を等間隔に複数個配置し、回転テーブルの停止中に、下型内に軟化ガラス塊を供給し、プレス成形位置まで下型を回転移動させ、上型および下型によりガラス塊をプレス成形した後、下型を回転移動させ、回転テーブルの停止中に、冷却固化したガラス成形品を下型から取り出す技術として、例えば、プレス成形位置において、回転テーブル上に固定した下型に対し、上型を下降させて、下型内の軟化ガラス塊をプレス成形した後、下型を所定位置まで回転移動し、成形品を下型から取り出す技術や、下型を胴型と胴型内を摺動する中型とで構成し、プレス成形位置において、中型を胴型内で下げた状態で、回転テーブル上に固定した下型に対して、上型を下降させて、下型内の軟化ガラス塊をプレス成形した後、下型を所定位置まで回転移動し、中型を下方より突き上げ上昇させた状態で成形品を下型を取り出す技術が知られている。
【0003】
しかしながら、上記従来技術においては、下型内の軟化ガラス塊を下降する上型により下方に押圧してプレス成形するため、上型から下型に加わる圧力により、下型を固定した回転テーブルがたわんで、成形品に偏心等の変形が生じることがある。特に、ガラス基板、フィルタ、カバーガラスまたはこれらに用いるためのブランクス等のように外径に比して肉厚寸法の小さい、いわゆる肉薄の成形品を成形する場合や、結晶化ガラスの原ガラスのように高粘性のガラスから成形品成形する場合は、軟化ガラス塊を押圧して、ガラスを上型および下型により区画規制される空間内に充填するのに大きな圧力を必要とするので、成形品に変形が生じやすい。
【0004】
また、実公昭45−12854号公報には、胴矢型を下げた位置で胴型内に溶融ガラス塊を装入し、胴型の上縁口に蓋体を覆って加圧するとともに胴矢型を押上げて成形する鋳造型が開示されている。この型においても蓋体で胴型を覆う際に、蓋体から胴型に圧力が加わるが、胴矢型を押し上げて溶融ガラス塊を上方に押圧してプレス成形するので、上記従来技術と比べて下型に加わる圧力は軽減される。したがって、この胴型を回転テーブル上に固定してプレス成形する場合、プレス成形時の回転テーブルのたわみは防止できるが、次のような問題点がある。
【0005】
すなわち、上記公報に開示されている鋳造型では、胴矢型の柄をプランジャー等をもって押上げて成形するので、成形後プランジャー等を下げたり、回転テーブルを回転させて胴型をプランジャー等の設置されている成形位置から移動させたりすると、胴矢型は、固定されていないため、成形時の高さ位置から胴型内面の底部まで落下し、その際の衝撃により成形直後の冷却固化していない成形品によじれ等の変形が生じることがあり、上述した肉薄の成形品では、特に変形が生じやすい。
【0006】
この変形を防止するには、成形品が変形しない程度に冷却固化するまで、回転テーブルを停止させ、胴矢型の柄を押し上げ続ければよいが、回転テーブルの停止中に、同一の回転テーブル上で成形と同時に行われる胴型への溶融ガラス塊の供給および成形品の取り出しが終了した後も、回転テーブルを停止し続けなければならず、生産効率の低下をまねく。また、胴型上方に設けたパイプから連続的に流下する溶融ガラス流を胴型内に流入させ、所定量のガラスが胴型内に流入した時点で溶融ガラス流を切断する方法により胴型内に溶融ガラス塊を供給する場合は、切断後すぐに溶融ガラス流が流下し始めるので、切断後、直ちに回転テーブルを回転させて、次の空の胴型をパイプ直下に移動させなければならず、成形品が変形しない程度に冷却固化するまで、回転テーブルを停止し続けることは、不可能に近い。
【0007】
以上の理由から、上記公報に開示されている鋳造型は、回転テーブルに取り付けて使用するのに不適当であると言わざるを得ない。
【0008】
【発明が解決しようとする課題】
本発明の目的は、上記従来技術の欠点を解消し、肉薄のガラス成形品を成形する場合や、高粘性のガラスからガラス成形品を成形する場合でも、成形品に偏心、よじれ等の変形が生じることがなく、かつ、生産効率の良いガラス成形品のプレス成形方法および装置を提供することにある。
【0009】
【課題を解決するための手段】
本発明者は、鋭意試験研究を重ねた結果、回転テーブルの回転中も、胴型内の中型を固定できるようにし、プレス成形してから成形品が冷却固化するまで、中型をプレス成形時の高さ位置に固定し続け、また、プレス成形を行うために中型を上昇させる際には、中型の固定を解除できるようにすることによって、上記目的を達成しうることを見いだし、本発明をなすに至った。
【0010】
すなわち、上記目的を達成するための本発明の方法の特徴は、間欠回転する回転テーブルの周縁部の同心位置上に、胴型および胴型内を上下方向に摺動する中型からなる下型を等間隔に複数個配置するとともに、プレス成形位置において下型の上方に上下動自在の上型を配置し、回転テーブルの停止中に、中型上面に軟化ガラス塊を供給し、プレス成形位置まで下型を回転移動させ、上型および下型によりガラス塊をプレス成形した後、下型を回転移動させ、回転テーブルの停止中に、冷却固化したガラス成形品を下型から取り出すガラス成形品のプレス成形方法において、プレス成形位置で回転テーブルが停止している間に、上型を下降させて胴型と接触させ、ついで、中型を上昇させてガラス塊をプレス成形した後上型を上昇させ、上型を上昇させる前または後に中型をプレス成形時の高さ位置に固定し、ついで、下型を回転移動させ、すくなくともガラス成形品が冷却固化するまで、中型を上記高さ位置に固定し続けた後、ガラス成形品を下型から取り出し、下型をプレス成形位置まで回転移動させ、再び中型の上昇を開始するまでに、中型の固定を解除することにある。
【0011】
また、本発明の装置は、上記本発明の方法を実施するための装置であり、その特徴は、間欠回転する回転テーブルの周縁部の同心位置上に、胴型および下方に延長するシャフトを備え胴型内を上下方向に摺動可能な中型からなる下型を等間隔に複数個設け、プレス成形位置における下型の上方に上下動自在の上型を設けるとともに該プレス成形位置における中型のシャフトに係合してシャフトを押上げることにより中型を上昇させ、ガラス塊のプレス成形後シャフトとの係合から離脱するシャフト上昇装置を設け、成形品取り出し位置における下型上方に成形品搬出装置を設けたプレス成形装置において、作動時において各中型のシャフトの側面に圧着してシャフトを固定し非作動時においてシャフトを解放して上下動自在とするシャフト固定装置を設けるとともに、上記シャフト固定装置の作動および非作動を切り替える作動規制装置を設けたことにある。
【0012】
【発明の実施の形態】
以下、本発明の方法および装置の実施の形態を図面に基づき説明する。図1は本発明の装置の一実施形態の概要を示す上面図である。図において、回転テーブル1は、回転軸2に支承されている。胴型3および胴型内に上下方向に摺動可能に嵌装された中型4からなる下型5は、下型受台6を介して回転テーブル1の周縁部の同心位置上に等間隔に複数個設けられており、回転テーブル1は、矢印×方向に下型一間隔分ずつ間欠回転し、下型5はガラス供給位置S、プレス成形位置P、成形品取り出し位置Tへ順次移動して行く。
【0013】
図2は、上記装置のガラス供給位置Sにおける一部断面側面図である。回転テ−ブル1は、ベース7上に直立する回転軸2に支承されており、回転軸2の周囲には2本一対のスリップリング8a、8bが設けられている。中型4は下方に延長するシャフト9を備えている。回転テーブル1の下面には、中型4下方のシャフト9の側方に位置するように本発明のシャフト固定装置を構成する電磁石10が設けられており、電磁石10とスリップリング8a、8bは、接続線11a、11bにより接続されていて、電源40からスリップリング8a、8bおよび接続線11a、11b介して電磁石10に通電し、作動させると、シャフト9の側面は磁力により電磁石に吸引固定される。また、通電を止め非作動にすると、シャフト9の固定は解除される。
【0014】
図には1個の電磁石のみ示したが、電磁石は各中型下方のシャフト側方に1個ずつ設けられ、それらの各電磁石に対し一対のスリップリングが設けられており、各電磁石とスリップリングは、接続線により接続されている。また、スリップリング対8a、8bとそれらに給電する電源40との間には、各電磁石への通電を個別にオンオフして、電磁石の作動、非作動を切り替えるための、作動規制装置を構成するリレースイッチ42a、42bがそれぞれ設けられている。また、下型5の真上には、図示しないガラス溶融装置に接続されたパイプ12の下端の溶融ガラス流出口13が設けられ、流出口13と下型5との間に一対の切断刃14が設けられている。
【0015】
図3は、上記装置のプレス成形位置Pにおける一部断面側面図である。ベース7上に直立する支柱15の上端には、支持プレート16が設けられ、支持プレート16の下面には、下型5の真上に位置するように,ピストンロッド17aを備えたシリンダ18aが設けられており、ピストンロッド17aの下端には上型19が固定されている。また、ベース7上には、中型4下方のシャフト9の真下に位置するように,ピストンロッド17bを備えたシリンダ18bが設けられている。ピストンロッド17bとシリンダ18bはシャフト上昇装置を構成する。
【0016】
図4は、上記装置の成形品取り出し位置Tにおける一部断面側面図である。中型4下方のシャフト9の真下には、図示しないシリンダに接続されたピストンロッド17cが設けられ、下型5の側方には、回転上下動軸20に支承され、先端に吸引部21を有する搬送アーム22が設けられ、回転上下動軸20の側方にはコンベア23が設けらている。
【0017】
次に上記装置を用いた本発明の方法の実施形態を図面に基づき説明する。まず、図2に示すとおり、ガラス供給位置Sにおいて、回転テーブル1が停止している間に、流出口13から連続的に流下する溶融ガラス流24を中型4の上面に流入させ、所定量のガラスが流入した時点で切断刃14により溶融ガラス流24を切断して軟化ガラス塊25を供給した後、回転テーブル1を回転させ、図3に示すとおり下型5をプレス成形位置Pまで移動させたところで、回転テーブル1を停止させる。
【0018】
ここで、まず、シリンダ18aを作動させ、ピストンロッド17aおよび上型19を下降させて上型19の下面を胴型3の上面に接触させる。ついで、シリンダ18bを作動させ、ピストンロッド17bを上昇させてシャフト9の下端部に係合させ、シャフト9の下端部を押し上げることによって中型4を上昇させて型内の軟化ガラス塊をプレス成形し、ハードディスク基板等に用いる肉薄円盤状のガラス成形品26を得る。そして、成形品26を得た時点で、スリップリング8a,8bと電源40との間に設けられているリレースイッチ42a、42bをオンにして通電し、電磁石10を作動させて磁力によりシャフト9の側面を吸引固定して、中型4をプレス成形時の高さ位置に固定する。ここで、シャフト9はその側面を固定されるので、型内に供給する軟化ガラス塊の量が変動して、中型4のプレス成形時の高さ位置が変化した場合でも、中型4はその変化した高さ位置に固定される。中型4を固定した後、ピストンロッド17aおよび上型19を上昇させるとともに、ピストンロッド17bを下降させる。ついで、中型4をプレス成形時の高さ位置に固定したまま、回転テ−ブル1を間欠回転させ、図4に示すとおり、下型5を成形品取り出し位置Tまで移動させる。この間に成形品26は変形しない程度に冷却固化する。
【0019】
なお、本実施形態においては中型4を固定した後上型19を上昇させているが、上型19を上昇させた後中型4を固定し次いでピストンロッド17bを下降させるようにしてもよい。
【0020】
ここで、回転テーブル1が停止している間に、リレースイッチ42a、42bをオフにして通電を中止し、電磁石10を非作動に切り替え、中型4の固定を解除するのと同時に、ピストンロッド17cを上昇させてシャフト9の下端部を押し上げ、中型4の上面を胴型3の上面と同じ高さまで上昇させ、成形品26の上面を、搬送ア−ム22先端の吸引部21で吸引し、回転上下動軸20を作動させて、搬送ア−ム22を上昇させ、180°回転させて、コンベア23上で吸引を止め、成形品26をコンベア23上に載置する。この後、成形品26はコンベア23により図示しないアニール炉またはガラスを結晶化するための熱処理炉に送られる。
【0021】
一方、成形品26を吸引搬送した後、ピストンロッド17cを下降させ、自重により中型4を下降させるとともに、回転テーブル1を間欠回転させて、下型5を元のガラス供給位置Sまで移動させ、再び軟化ガラス塊の供給を行う。
【0022】
次に、本発明の装置の他の実施形態を図5〜図8に基づき説明する。図5は本実施形態の装置の主要部を示す側断面図であり、図6は図5におけるA−A´線水平上断面図である。本実施形態では、胴型3および胴型内を上下方向に摺動する中型4からなる下型5は、基台27および下型受台6を介して回転テーブル1の周縁部の同心位置上に等間隔に複数個設けられている(1個のみ図示する)。回転テーブル1は、図示しない回転軸に支承されており、先の実施形態と同様に下型一間隔分ずつ間欠回転し、下型5はガラス供給位置、プレス成形位置、成形品取り出し位置へ順次移動して行く。
【0023】
ここで、下型受台6の下部には溝28が形成され、下型受台6の外周部29と溝部28とを貫通する貫通孔30が穿設されている。溝28にはクランプレバー31が挿入されており、その一端部はボルト32によって基台27上に軸着されており、他端部は溝部28の外に突出している。貫通孔30の外周部29側内面にはネジ山が形成され、調整ネジ33がねじ込まれており、溝28側にはコイルスプリング34が挿入されていて、コイルスプリング34により押圧されているクランプレバー31は、中型4下方のシャフト9の側面を圧着固定している。このコイルスプリング34の押圧力は調整ネジ33を回すことによって調整される。クランプレバー31、調整ネジ33、コイルスプリング34は本発明のシャフト固定装置を構成する。
【0024】
また、本実施形態の装置では、プレス成形位置および成形品取り出し位置の回転テーブル1側方に支持台35が設けられ、支持台35上にスライディングロッド36を備えたシリンダ37が設けられている。ここで、シリンダ37を作動させ、スライディングロッド36を前進させて、コイルスプリング34による押圧力に抗して、クランプレバー31の端部を押すと、クランプレバー31はボルト32を支点として矢印方向に移動しシャフト9から離れ、シャフト9の固定は解除される。また、スライディングロッド36を後退させると、コイルスプリング34に押圧されてクランプレバー31は元の位置に復帰し、シャフト9は再び固定される。スライディングロッド36とシリンダ37は作動規制装置を構成する。
【0025】
次に上記装置を用いた本発明の方法の実施形態を図面に基づき説明する。
溶融ガラス流24を中型4の上面に流入させてから、プレス成形位置において、上型19の下面を胴型3の上面に接触させる間の工程は図1〜図4を参照して上述した、本発明方法の実施形態と同じであり、説明を省略する。
【0026】
本実施形態では、図7に示すとおり、プレス成形位置において、上型19の下面を胴型3の上面に接触させた後、シリンダ37を作動させ、スライディングロッド36を前進させて、図示しないコイルスプリングの押圧力に抗してクランプレバー31の端部を押し、中型4下方のシャフト9の固定を解除し、ついで、図示しないシリンダを作動させ、ピストンロッド17bを上昇させてシャフト9の下端部を押し上げ、中型4を上昇させて型内の軟化ガラス塊をプレス成形し、先の実施形態と同様の形状のガラス成形品26を得る。そして、成形品26を得た時点で、スライディングロッド36を後退させ、クランプレバー31を上記コイルスプリングの押圧力により元の位置に戻して、シャフト9の側面を圧着固定して、中型4をプレス成形時の高さ位置に固定する。その後、下型5を成形品取り出し位置まで移動させる間の工程は、図1〜図4の実施形態と同じであり、説明を省略する。
【0027】
図8に示すとおり、下型5を成形品取り出し位置に移動させた後、シリンダ37を作動させ、スライディングロッド36を前進させ、図7において説明したのと同様にして、シャフト9の固定を解除するのと同時に、ピストンロッド17cを上昇させてシャフト9の下端部を押し上げ、中型4の上面を胴型3の上面と同じ高さまで上昇させる。成形品26の吸引搬送工程については、図1〜図4の実施形態と同じであるので説明を省略する。
【0028】
一方、成形品26を吸引搬送した後、ピストンロッド17cを下降させ、自重により中型4を下降させた後、スライディングロッド36を後退させ、ついで、回転テーブル1を間欠回転させて、下型5を元のガラス供給位置まで移動させ、再び軟化ガラス塊の供給を行う。
【0029】
以上述べた本発明の各実施形態では、肉薄円盤状の成形品を得る形態について説明したが、上型および下型の成形面を所望の成形品の形状に合わせた形状とすることにより、レンズ、プリズム等の光学素子またはそれらに用いるためのブランクスや、コップ、食器等のガラス容器等、種々のガラス成形品を成形することができる。
【0030】
上記実施形態においては、シャフト固定装置として電磁石10またはクランプレバー31等の機構を使用しているが、シャフト固定装置はこれに限らず種々の機構を使用することが可能であり、要は作動時に中型のシャフトに圧着してシャフトを固定し非作動時にシャフトを解放して上下動を許容する作用を果たしうる機構であればよい。ただし、上記実施形態において使用した各シャフト固定装置は、簡単な構成で確実かつ迅速にシャフトの固定、解放を行うことができるので特に好ましい機構である
【0031】
【発明の効果】
以上、述べたとおり、本発明は、間欠回転する回転テーブルの周縁部の同心位置上に、胴型および胴型内を上下方向に摺動する中型からなる下型を等間隔に複数個配置するとともに、プレス成形位置において下型の上方に上下動自在の上型を配置し、回転テーブルの停止中に、中型上面に軟化ガラス塊を供給し、プレス成形位置まで下型を回転移動させ、上型および下型によりガラス塊をプレス成形した後、下型を回転移動させ、回転テーブルの停止中に、冷却固化したガラス成形品を下型から取り出すガラス成形品のプレス成形方法において、プレス成形位置で回転テーブルが停止している間に、上型を下降させて胴型と接触させ、ついで、中型を上昇させてガラス塊をプレス成形した後上型を上昇させ、上型を上昇させる前または後に中型をプレス成形時の高さ位置に固定し、ついで、下型を回転移動させ、すくなくともガラス成形品が冷却固化するまで、中型を上記高さ位置に固定し続けた後、ガラス成形品を下型から取り出し、下型をプレス成形位置まで回転移動させ、再び中型の上昇を開始するまでに、中型の固定を解除するプレス成形方法であり、また、上記方法を実施するための装置であるから、プレス成形時の回転テーブルのたわみや、プレス成形後の中型の落下、下降時の衝撃、振動に起因するガラス成形品の変形が発生せず、ハードディスク基板等のガラス基板、フィルタ、カバーガラスおよびこれらに用いるためのブランクス等の肉薄のガラス成形品を成形する場合や、結晶化ガラスの原ガラスのように高粘性のガラスから成形品を成形する場合でも、ガラス成形品に偏心、よじれ等の変形が生じることがない。また、回転テーブルの回転中も、中型をプレス成形時の高さ位置に固定するので、プレス成形終了後、直ちに、回転テーブルを回転させても成形品に変形が生じるおそれがなく、効率良く生産を行うことができる。
【図面の簡単な説明】
【図1】本発明の1実施形態にかかる装置の概要を示す上面図。
【図2】同装置のガラス供給位置Sにおける一部断面側面図。
【図3】同装置のプレス成形位置Pにおける一部断面側面図。
【図4】同装置の成形品取り出し位置Tにおける一部断面側面図。
【図5】本発明の他の実施形態にかかる装置の主要部を示す断面図。
【図6】図5に示すA−A´線水平上断面図。
【図7】同装置のプレス成形位置Pにおける一部断面側面図。
【図8】同装置の成形品取り出し位置Tにおける一部断面側面図。
【符号の説明】
1 回転テーブル
3 胴型
4 中型
5 下型
9 シャフト
10 電磁石
19 上型
25 軟化ガラス塊
26 ガラス成形品
31 クランプレバー
34 コイルスプリング
36 スライディングロッド
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for press-molding a glass molded product.
[0002]
[Prior art]
A plurality of lower molds are arranged at regular intervals on a rotating table that rotates intermittently. While the rotary table is stopped, softened glass lump is supplied into the lower mold, and the lower mold is rotated and moved to the press molding position. As a technique for removing the cooled and solidified glass molded product from the lower mold while rotating the lower mold and pressing the glass lump with the lower mold and stopping the rotary table, for example, at the press molding position on the rotary table Lowering the upper mold against the lower mold fixed to the press, press-molding the softened glass lump in the lower mold, and then rotating the lower mold to a predetermined position to remove the molded product from the lower mold, The upper die is lowered with respect to the lower die fixed on the rotary table with the middle die lowered in the barrel die at the press molding position. Press the softened glass block in the lower mold After, rotationally moves the lower mold to a predetermined position, there is known a technique for taking out the lower mold a molded article in a state of increased push up from below the middle size.
[0003]
However, in the above prior art, since the soft glass lump in the lower mold is pressed downward by the upper mold that descends and press-molded, the rotary table that fixes the lower mold is bent by the pressure applied from the upper mold to the lower mold. Thus, deformation such as eccentricity may occur in the molded product. In particular, when forming a so-called thin molded product having a small thickness compared to the outer diameter, such as a glass substrate, a filter, a cover glass, or blanks for use in these, or of the original glass of crystallized glass When molding a molded product from high-viscosity glass, a large pressure is required to press the softened glass lump and fill the glass into the space restricted by the upper and lower molds. The product is prone to deformation.
[0004]
In Japanese Utility Model Publication No. 45-12854, a molten glass lump is inserted into the trunk mold at a position where the trunk arrow mold is lowered, and the upper edge of the trunk mold is covered with a lid and pressed, and the barrel arrow mold is used. There is disclosed a casting mold that pushes up and molds. In this mold as well, when covering the trunk mold with the lid, pressure is applied from the lid to the trunk mold, but the barrel arrow mold is pushed up and the molten glass lump is pressed upward to perform press molding. The pressure applied to the lower mold is reduced. Therefore, when the body mold is fixed on the rotary table and press molding, the deflection of the rotary table during press molding can be prevented, but there are the following problems.
[0005]
That is, in the casting mold disclosed in the above publication, the handle is shaped by pushing up the handle of the trunk arrow with a plunger or the like, so that the plunger or the like is lowered after the molding or the rotary table is rotated. If it is moved from the molding position where it is installed, etc., the barrel arrow mold will not be fixed, so it will drop from the height position during molding to the bottom of the inner surface of the trunk mold, and cooling immediately after molding due to the impact at that time Deformation such as kinking may occur due to an unsolidified molded product, and deformation is particularly likely to occur in the thin molded product described above.
[0006]
In order to prevent this deformation, it is sufficient to stop the rotary table until the molded product is cooled and solidified to such an extent that it does not deform, and continue to push up the handle of the bow and arrow shape. After the supply of the molten glass lump to the barrel mold and the removal of the molded product, which are performed simultaneously with the molding, the rotary table must be stopped, resulting in a decrease in production efficiency. In addition, a molten glass flow that continuously flows down from a pipe provided above the barrel mold is caused to flow into the barrel mold, and when a predetermined amount of glass flows into the barrel mold, the molten glass stream is cut into the barrel mold. When the molten glass lump is supplied to the pipe, the molten glass flow begins to flow immediately after cutting, so the rotary table must be rotated immediately after cutting to move the next empty body mold directly under the pipe. It is almost impossible to keep the rotary table stopped until the molded product is cooled and solidified to such an extent that it does not deform.
[0007]
For the above reasons, the casting mold disclosed in the above publication must be said to be unsuitable for use by being attached to a rotary table.
[0008]
[Problems to be solved by the invention]
The object of the present invention is to eliminate the drawbacks of the prior art described above, and even when a thin glass molded product is formed or when a glass molded product is formed from highly viscous glass, the molded product is not subject to deformation such as eccentricity and kinking. An object of the present invention is to provide a method and an apparatus for press-molding a glass molded product that does not occur and has high production efficiency.
[0009]
[Means for Solving the Problems]
As a result of intensive studies, the present inventor has made it possible to fix the middle mold in the body mold even during the rotation of the rotary table, and from the press molding until the molded product cooled and solidified, It has been found that the above-mentioned object can be achieved by allowing the middle mold to be released when the middle mold is lifted to continue to be fixed at the height position and press molding is performed. It came to.
[0010]
That is, the feature of the method of the present invention for achieving the above object is that a body mold and a lower mold comprising a middle mold that slides in the body mold in the vertical direction are arranged on the concentric position of the peripheral edge of a rotating table that rotates intermittently. A plurality of upper molds are arranged at equal intervals, and an upper mold that can be moved up and down is arranged above the lower mold at the press molding position. While the rotary table is stopped, a softened glass lump is supplied to the upper surface of the middle mold and lowered to the press molding position. After the mold is rotated and the glass lump is press-molded by the upper mold and the lower mold, the lower mold is rotated and the cooled and solidified glass molded product is taken out from the lower mold while the rotary table is stopped. In the molding method, while the rotary table is stopped at the press molding position, the upper die is lowered and brought into contact with the barrel die, and then the middle die is raised to press the glass lump and then the upper die is raised. Upper mold Before or after raising, fix the middle mold at the height position at the time of press molding, then rotate and move the lower mold, and at least keep fixing the middle mold at the above height position until the glass molded product is cooled and solidified. The glass molded product is taken out from the lower mold, the lower mold is rotated and moved to the press molding position, and the fixing of the middle mold is released before the middle mold starts to rise again.
[0011]
The apparatus of the present invention is an apparatus for carrying out the above-described method of the present invention. The feature of the apparatus is that it is provided with a body mold and a shaft extending downward on a concentric position of the peripheral portion of the rotary table that rotates intermittently. A plurality of lower molds made of a middle mold that can slide in the vertical direction in the body mold are provided at equal intervals, an upper mold that can be moved up and down is provided above the lower mold at the press molding position, and a middle shaft at the press molding position. The shaft is raised by engaging with the shaft to raise the middle die, and after the glass lump is press-molded, a shaft raising device is provided to disengage from the shaft. In the press forming equipment provided, the shaft is fixed to the side of each medium-sized shaft by pressing to fix the shaft during operation, and the shaft is released to move up and down during non-operation. Provided with a device, in the provision of the operation restricting device for switching the operation and non-operation of the shaft locking device.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the method and apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a top view showing an outline of an embodiment of the apparatus of the present invention. In the figure, the rotary table 1 is supported on a rotary shaft 2. The lower mold 5 comprising the body mold 3 and the middle mold 4 fitted in the body mold so as to be slidable in the vertical direction is arranged at equal intervals on the concentric position of the peripheral edge of the rotary table 1 via the lower mold cradle 6. A plurality of rotary tables 1 are intermittently rotated at intervals of the lower mold in the direction indicated by the arrow X, and the lower mold 5 is sequentially moved to the glass supply position S, the press molding position P, and the molded product removal position T. go.
[0013]
FIG. 2 is a partial cross-sectional side view at the glass supply position S of the apparatus. The rotary table 1 is supported on a rotary shaft 2 that stands upright on a base 7, and a pair of slip rings 8 a and 8 b are provided around the rotary shaft 2. The middle mold 4 includes a shaft 9 extending downward. An electromagnet 10 constituting the shaft fixing device of the present invention is provided on the lower surface of the turntable 1 so as to be positioned on the side of the shaft 9 below the middle mold 4. The electromagnet 10 and the slip rings 8 a and 8 b are connected to each other. When the electromagnet 10 is energized and operated from the power supply 40 via the slip rings 8a and 8b and the connection wires 11a and 11b, the side surfaces of the shaft 9 are attracted and fixed to the electromagnet by magnetic force. Further, when the energization is stopped and deactivated, the fixing of the shaft 9 is released.
[0014]
Although only one electromagnet is shown in the figure, one electromagnet is provided on the side of the shaft below each middle mold, and a pair of slip rings are provided for each of the electromagnets. Are connected by connection lines. Moreover, between the slip ring pair 8a and 8b and the power supply 40 which supplies electric power to them, the operation control device for switching on and off the operation of the electromagnet by individually turning on / off the energization to each electromagnet is configured. Relay switches 42a and 42b are respectively provided. Further, a molten glass outlet 13 at the lower end of a pipe 12 connected to a glass melting apparatus (not shown) is provided directly above the lower mold 5, and a pair of cutting blades 14 are provided between the outlet 13 and the lower mold 5. Is provided.
[0015]
FIG. 3 is a partial cross-sectional side view at the press forming position P of the apparatus. A support plate 16 is provided at the upper end of the column 15 upright on the base 7, and a cylinder 18 a provided with a piston rod 17 a is provided on the lower surface of the support plate 16 so as to be positioned directly above the lower mold 5. The upper die 19 is fixed to the lower end of the piston rod 17a. In addition, a cylinder 18b having a piston rod 17b is provided on the base 7 so as to be positioned directly below the shaft 9 below the middle die 4. The piston rod 17b and the cylinder 18b constitute a shaft raising device.
[0016]
FIG. 4 is a partial cross-sectional side view of the apparatus at a molded product take-out position T. FIG. A piston rod 17c connected to a cylinder (not shown) is provided directly below the shaft 9 below the middle die 4, and a side of the lower die 5 is supported by a rotary vertical movement shaft 20, and has a suction portion 21 at the tip. A transfer arm 22 is provided, and a conveyor 23 is provided on the side of the rotary vertical movement shaft 20.
[0017]
Next, an embodiment of the method of the present invention using the above apparatus will be described with reference to the drawings. First, as shown in FIG. 2, while the turntable 1 is stopped at the glass supply position S, a molten glass flow 24 that continuously flows down from the outlet 13 is caused to flow into the upper surface of the middle mold 4, and a predetermined amount of When the glass flows in, the cutting glass 14 cuts the molten glass flow 24 and supplies the softened glass lump 25, and then the rotary table 1 is rotated to move the lower die 5 to the press forming position P as shown in FIG. At that point, the rotary table 1 is stopped.
[0018]
Here, first, the cylinder 18 a is operated, the piston rod 17 a and the upper die 19 are lowered, and the lower surface of the upper die 19 is brought into contact with the upper surface of the body die 3. Next, the cylinder 18b is operated, the piston rod 17b is raised and engaged with the lower end portion of the shaft 9, the middle die 4 is raised by pushing up the lower end portion of the shaft 9, and the softened glass lump in the die is press-molded. A thin disk-shaped glass molded product 26 used for a hard disk substrate or the like is obtained. When the molded product 26 is obtained, the relay switches 42a and 42b provided between the slip rings 8a and 8b and the power source 40 are turned on to energize, the electromagnet 10 is operated, and the magnetic force of the shaft 9 is increased. The side surface is fixed by suction, and the middle die 4 is fixed at the height position during press molding. Here, since the side surface of the shaft 9 is fixed, even if the amount of the softened glass lump supplied into the mold fluctuates and the height position of the middle mold 4 during the press molding changes, the middle mold 4 does not change. It is fixed at the height position. After fixing the middle die 4, the piston rod 17a and the upper die 19 are raised, and the piston rod 17b is lowered. Next, the rotary table 1 is intermittently rotated while the middle die 4 is fixed at the height position at the time of press molding, and the lower die 5 is moved to the molded product removal position T as shown in FIG. During this time, the molded product 26 is cooled and solidified to such an extent that it does not deform.
[0019]
In this embodiment, the upper die 19 is raised after the middle die 4 is fixed. However, the middle die 4 may be secured after the upper die 19 is raised, and then the piston rod 17b is lowered.
[0020]
Here, while the turntable 1 is stopped, the relay switches 42a and 42b are turned off to stop energization, the electromagnet 10 is switched to non-operation, and the fixing of the middle die 4 is released at the same time, the piston rod 17c. And the lower end of the shaft 9 is pushed up, the upper surface of the middle mold 4 is raised to the same height as the upper surface of the body mold 3, and the upper surface of the molded product 26 is sucked by the suction part 21 at the tip of the transfer arm 22, The rotary vertical movement shaft 20 is actuated to raise the transport arm 22 and rotate it 180 ° to stop the suction on the conveyor 23 and place the molded product 26 on the conveyor 23. Thereafter, the molded product 26 is sent by the conveyor 23 to an annealing furnace (not shown) or a heat treatment furnace for crystallizing glass.
[0021]
On the other hand, after sucking and conveying the molded product 26, the piston rod 17c is lowered, the middle die 4 is lowered by its own weight, the rotary table 1 is intermittently rotated, and the lower die 5 is moved to the original glass supply position S, Supply softened glass lump again.
[0022]
Next, another embodiment of the apparatus of the present invention will be described with reference to FIGS. FIG. 5 is a side cross-sectional view showing the main part of the apparatus of this embodiment, and FIG. 6 is a horizontal cross-sectional view along the line AA ′ in FIG. In the present embodiment, the lower mold 5 including the body mold 3 and the middle mold 4 that slides up and down in the body mold is positioned on the concentric position of the peripheral portion of the turntable 1 via the base 27 and the lower mold support 6. Are provided at equal intervals (only one is shown). The rotary table 1 is supported by a rotation shaft (not shown), and intermittently rotates by one lower mold interval as in the previous embodiment, and the lower mold 5 sequentially moves to a glass supply position, a press molding position, and a molded product removal position. Go and go.
[0023]
Here, a groove 28 is formed in the lower part of the lower mold base 6, and a through hole 30 that penetrates the outer peripheral part 29 and the groove part 28 of the lower mold base 6 is formed. A clamp lever 31 is inserted into the groove 28, one end of which is pivotally mounted on the base 27 by a bolt 32, and the other end projects out of the groove 28. A screw thread is formed on the inner surface of the through hole 30 on the outer peripheral portion 29 side, an adjustment screw 33 is screwed in, a coil spring 34 is inserted in the groove 28 side, and the clamp lever pressed by the coil spring 34 31 fixes the side surface of the shaft 9 below the middle mold 4 by pressure bonding. The pressing force of the coil spring 34 is adjusted by turning the adjusting screw 33. The clamp lever 31, the adjustment screw 33, and the coil spring 34 constitute the shaft fixing device of the present invention.
[0024]
Further, in the apparatus of the present embodiment, a support base 35 is provided on the side of the rotary table 1 at the press molding position and the molded product take-out position, and a cylinder 37 having a sliding rod 36 is provided on the support base 35. Here, when the cylinder 37 is operated, the sliding rod 36 is advanced, and the end of the clamp lever 31 is pushed against the pressing force of the coil spring 34, the clamp lever 31 is moved in the direction of the arrow with the bolt 32 as a fulcrum. It moves away from the shaft 9 and the fixing of the shaft 9 is released. When the sliding rod 36 is moved backward, the clamp lever 31 is returned to the original position by being pressed by the coil spring 34, and the shaft 9 is fixed again. The sliding rod 36 and the cylinder 37 constitute an operation restricting device.
[0025]
Next, an embodiment of the method of the present invention using the above apparatus will be described with reference to the drawings.
The process during which the molten glass stream 24 flows into the upper surface of the middle mold 4 and then the lower surface of the upper mold 19 is brought into contact with the upper surface of the body mold 3 at the press molding position has been described above with reference to FIGS. This is the same as the embodiment of the method of the present invention, and a description thereof will be omitted.
[0026]
In the present embodiment, as shown in FIG. 7, after the lower surface of the upper die 19 is brought into contact with the upper surface of the body die 3 at the press molding position, the cylinder 37 is operated to advance the sliding rod 36, and a coil (not shown) The end of the clamp lever 31 is pushed against the pressing force of the spring to release the fixing of the shaft 9 below the middle mold 4, and then the cylinder (not shown) is operated to raise the piston rod 17 b to lower the lower end of the shaft 9. And the middle mold 4 is raised to press-mold the softened glass lump in the mold to obtain a glass molded product 26 having the same shape as in the previous embodiment. When the molded product 26 is obtained, the sliding rod 36 is retracted, the clamp lever 31 is returned to the original position by the pressing force of the coil spring, the side surface of the shaft 9 is fixed by crimping, and the middle die 4 is pressed. Fix to the height position during molding. Then, the process while moving the lower mold | type 5 to a molded article taking-out position is the same as embodiment of FIGS. 1-4, and abbreviate | omits description.
[0027]
As shown in FIG. 8, after the lower mold 5 is moved to the molded product take-out position, the cylinder 37 is operated, the sliding rod 36 is advanced, and the shaft 9 is released in the same manner as described in FIG. At the same time, the piston rod 17c is raised to push up the lower end portion of the shaft 9, and the upper surface of the middle die 4 is raised to the same height as the upper surface of the body die 3. About the suction conveyance process of the molded article 26, since it is the same as embodiment of FIGS. 1-4, description is abbreviate | omitted.
[0028]
On the other hand, after sucking and conveying the molded product 26, the piston rod 17c is lowered, the middle die 4 is lowered by its own weight, then the sliding rod 36 is retracted, and then the rotary table 1 is intermittently rotated to lower the lower die 5. Move to the original glass supply position and supply the softened glass lump again.
[0029]
In each of the embodiments of the present invention described above, the form for obtaining a thin disk-shaped molded product has been described. However, by forming the molding surfaces of the upper mold and the lower mold in accordance with the shape of the desired molded product, the lens can be obtained. Various glass molded articles such as optical elements such as prisms or blanks for use in them, glass containers such as cups and tableware can be molded.
[0030]
In the above embodiment, a mechanism such as the electromagnet 10 or the clamp lever 31 is used as the shaft fixing device. However, the shaft fixing device is not limited to this, and various mechanisms can be used. Any mechanism may be used as long as it can press the medium-sized shaft to fix the shaft and release the shaft when not in operation to allow the vertical movement. However, each shaft fixing device used in the above embodiment is a particularly preferable mechanism because the shaft can be fixed and released reliably and quickly with a simple configuration.
【The invention's effect】
As described above, according to the present invention, a plurality of lower molds composed of a middle mold that slides in the vertical direction in the body mold and the body mold are arranged at equal intervals on the concentric position of the peripheral portion of the rotary table that rotates intermittently. At the same time, an upper mold that can move up and down is placed above the lower mold at the press molding position, and while the rotary table is stopped, the softened glass lump is supplied to the upper surface of the middle mold, and the lower mold is rotated to the press molding position. In the press molding method of the glass molded product, after pressing the glass lump with the mold and the lower mold, the lower mold is rotated and the cooled and solidified glass molded product is taken out from the lower mold while the rotary table is stopped. While the rotary table is stopped, the upper die is lowered and brought into contact with the barrel die, and then the middle die is raised to press the glass lump and then the upper die is raised and before the upper die is raised or Later in Is fixed at the height position at the time of press molding, then the lower mold is rotated and moved, and at least until the glass molded article cools and solidifies, the middle mold is fixed at the above height position, and then the glass molded article is The lower mold is rotated and moved to the press molding position, and until the middle mold starts to rise again, it is a press molding method for releasing the fixing of the middle mold, and since it is an apparatus for carrying out the above method, Glass substrate such as hard disk substrate, filter, cover glass, and these are not deformed due to deflection of rotary table during press molding, fall of middle mold after press molding, impact during lowering, vibration due to vibration Even when forming thin glass molded products such as blanks for use in glass, or when molding molded products from highly viscous glass such as the original glass of crystallized glass, Eccentric the molded article, causing no deformation such as twist. Also, while the rotary table is rotating, the middle mold is fixed at the height position at the time of press molding, so there is no risk of deformation of the molded product even if the rotary table is rotated immediately after the press molding is completed. It can be performed.
[Brief description of the drawings]
FIG. 1 is a top view showing an outline of an apparatus according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional side view at the glass supply position S of the apparatus.
FIG. 3 is a partial cross-sectional side view at a press forming position P of the apparatus.
FIG. 4 is a partial cross-sectional side view at a molded product take-out position T of the apparatus.
FIG. 5 is a cross-sectional view showing a main part of an apparatus according to another embodiment of the present invention.
6 is a horizontal sectional view taken along line AA ′ shown in FIG.
FIG. 7 is a partial cross-sectional side view at a press molding position P of the apparatus.
FIG. 8 is a partial cross-sectional side view of the apparatus at a molded product take-out position T;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Turntable 3 Body type 4 Medium type 5 Lower type 9 Shaft 10 Electromagnet 19 Upper type 25 Softened glass lump 26 Glass molded product 31 Clamp lever 34 Coil spring 36 Sliding rod

Claims (2)

間欠回転する回転テーブルの周縁部の同心位置上に、胴型および胴型内を上下方向に摺動可能な中型からなる下型を等間隔に複数個配置するとともに、プレス成形位置において下型の上方に上下動自在の上型を配置し、回転テーブルの停止中に、中型上面に軟化ガラス塊を供給し、プレス成形位置まで下型を回転移動させ、上型および下型によりガラス塊をプレス成形した後、下型を回転移動させ、回転テーブルの停止中に、冷却固化したガラス成形品を下型から取り出すガラス成形品のプレス成形方法において、プレス成形位置で回転テーブルが停止している間に、上型を下降させて胴型と接触させ、ついで、中型を上昇させてガラス塊をプレス成形した後上型を上昇させ、上型を上昇させる前または後に中型をプレス成形時の高さ位置に固定し、ついで、下型を回転移動させ、すくなくともガラス成形品が冷却固化するまで、中型を上記高さ位置に固定し続けた後、ガラス成形品を下型から取り出し、下型をプレス成形位置まで回転移動させ、再び中型の上昇を開始するまでに、中型の固定を解除することを特徴とするガラス成形品のプレス成形方法。  On the concentric position of the peripheral edge of the rotary table that rotates intermittently, a plurality of lower molds composed of a middle mold and a middle mold that can slide in the vertical direction in the barrel mold are arranged at equal intervals. An upper mold that can move up and down is placed above, and while the rotary table is stopped, the softened glass lump is supplied to the upper surface of the middle mold, the lower mold is rotated to the press molding position, and the glass lump is pressed by the upper mold and the lower mold. After molding, the lower mold is rotated and moved, and while the rotary table is stopped, the cooled and solidified glass molded product is taken out from the lower mold. During the glass molding product press molding method, the rotary table is stopped at the press molding position. Next, lower the upper mold and bring it into contact with the body mold, then raise the middle mold to press the glass lump and then raise the upper mold, before or after raising the upper mold position Then, rotate the lower mold and continue to fix the middle mold at the above height position until the glass molded article cools and solidifies at least, then remove the glass molded article from the lower mold and place the lower mold in the press molding position. A method of press-molding a glass molded product, wherein the middle mold is released before the middle mold is started to rise again. 間欠回転する回転テーブルの周縁部の同心位置上に、胴型および下方に延長するシャフトを備え胴型内を上下方向に摺動可能な中型からなる下型を等間隔に複数個設け、プレス成形位置における下型の上方に上下動自在の上型を設けるとともに該プレス成形位置における中型のシャフトに係合してシャフトを押上げることにより中型を上昇させ、ガラス塊のプレス成形後シャフトとの係合から離脱するシャフト上昇装置を設け、成形品取り出し位置における下型上方に成形品搬出装置を設けたプレス成形装置において、作動させると各中型のシャフト側面に圧着してシャフトを固定し非作動にするとシャフトを解放して上下動自在とするシャフト固定装置を設けるとともに、上記シャフト固定装置の作動および非作動を切り替える作動規制装置を設けたことを特徴とするガラス成形品のプレス成形装置。On the concentric position of the peripheral edge of the rotating table that rotates intermittently, a plurality of lower molds consisting of a body mold and a middle mold that can slide in the vertical direction in the body mold with a shaft extending downward are provided at equal intervals. An upper mold that can move up and down is provided above the lower mold at the position, and the middle mold is raised by engaging the shaft of the middle mold at the press molding position and pushing up the shaft. When a press molding device is provided with a shaft lifting device that disengages from the joint and a molded product unloading device is installed above the lower mold at the molded product take-out position, it is crimped to the shaft side of each middle mold to fix the shaft and deactivate it then provided with a shaft locking device for freely moving up and down to release the shaft, working inhibition instrumentation for switching the operation and non-operation of the shaft locking device Glass molded product press forming apparatus, wherein a is provided.
JP09025197A 1997-03-25 1997-03-25 Method and apparatus for press molding glass molded article Expired - Fee Related JP3922756B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP09025197A JP3922756B2 (en) 1997-03-25 1997-03-25 Method and apparatus for press molding glass molded article
MYPI9801270 MY121305A (en) 1997-03-25 1998-03-24 Method and apparatus for press- forming glass article

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP09025197A JP3922756B2 (en) 1997-03-25 1997-03-25 Method and apparatus for press molding glass molded article

Publications (2)

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JPH10265229A JPH10265229A (en) 1998-10-06
JP3922756B2 true JP3922756B2 (en) 2007-05-30

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Country Link
JP (1) JP3922756B2 (en)
MY (1) MY121305A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11713269B2 (en) * 2018-01-26 2023-08-01 Schott Pharma Schweiz Ag Hot-forming device for producing glass containers from glass tubes

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
JP4939677B2 (en) * 2005-03-29 2012-05-30 Hoya株式会社 Optical element manufacturing method and mold press molding apparatus
CN111003926B (en) * 2019-12-12 2022-04-05 安徽省凤阳县前力玻璃制品有限公司 Double-servo press for glassware
CN112830664A (en) * 2020-12-31 2021-05-25 重庆荣成玻璃制品有限公司 Glassware production device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11713269B2 (en) * 2018-01-26 2023-08-01 Schott Pharma Schweiz Ag Hot-forming device for producing glass containers from glass tubes

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MY121305A (en) 2006-01-28
JPH10265229A (en) 1998-10-06

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