JP4188061B2 - Sheet glass composite bending apparatus and method for forming composite bent glass sheet - Google Patents
Sheet glass composite bending apparatus and method for forming composite bent glass sheet Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、自動車用の窓ガラスのように複合曲面を有するガラス板を成形する板ガラスの複合曲げ装置と、該装置を使用する複合曲げガラス板の成形方法に関する。本明細書における複合曲面を有するガラス板とは、直交するＸ−Ｙ軸の回りに曲面を形成した３次元的形状の板ガラスであり、特に、Ｚ軸の正負の一方にのみ凸状に湾曲した所望の曲率を有するガラス板である。
【０００２】
【従来の技術】
自動車用窓ガラスなどに使用される湾曲ガラス板は、型枠に載置されている板ガラスを加熱軟化し重力作用により垂下させて曲げる重力曲げ方法、型を使用して加熱された板ガラスをプレス曲げするプレス曲げ方法、ハースベッドから噴出される高温ガスにより板ガラスを浮揚、移動させながら曲げるガスハース曲げ方法、板ガラスをロール搬送しながら搬送ロールの形状に倣って曲げるローラハース曲げ方法などにより曲げ成形されており、湾曲ガラス板の大きさ、形状によって適宜使い分けされている。
【０００３】
ガスハース炉により曲げ成形する方法は生産性が高く、低コストで生産できるメリットを有しているが、ガラス板の搬送方向と直角であるベッドの幅方向に対して曲率を有する単一曲げガラス板を製造するのは容易であるのに対して、搬送方向に曲げられている複合曲げガラス板を製造することはその構造上容易ではなかった。以下では、ガラス板の搬送方向をベッドの長手方向とし、長手方向を横断する搬送方向と直角な方向をベッドの幅方向と表現する。ガスハース曲げ法は加熱炉内に連続して並べられたハースベッドの上を、該ハースベッド表面に対してほぼ垂直にベッドの裏面から表面に貫通したガス噴出口を通して高温ガスを噴出することにより板ガラスを浮上させて、該板ガラスを加熱炉の入口側から出口側へと搬送しながら加熱していく間に、板ガラスの自重により該ハースベッドに倣った形状に次第に曲げ成形する方式である。
【０００４】
搬送方向の曲率半径が数万ｍｍの複合曲げガラス板を連続的に成形するためには、板ガラスを湾曲させる方向に、例えば下方向に搬送しながら高温軟化状態にあるガラス板を冷却することにより所望の湾曲形状に固化する必要がある。
【０００５】
板ガラスを搬送方向に複合曲げする装置としては、特公昭４９−１０３３１号公報（米国特許第３４０９４２２号明細書）記載の装置がよく知られている。この装置はガスハース炉の最終に近いベッド以降の複数のハースベッドの搬送面と、ガスハース出口部の最終ベッドに接続される冷却装置の搬送面とを、板ガラスの搬送方向にも湾曲している複合曲面状としてある。該複合曲面状のベッドと冷却装置は搬送方向に次第に下向きに傾斜させて配置することにより板ガラスを複合曲面状に曲げる装置である。この装置ではベッドと冷却装置とが順次下向きに接続して配置されているので最終製品として取出す高さレベルが低くなりすぎるという問題があった。また、単一曲げガラス板と複合曲げガラス板の製造を相互に切替える際には、加熱炉内の最終に近い複数のベッドと該ベッドに接続される冷却装置とを取り替える必要があり、さらには、複数のベッド間の傾斜角度と接続の調整、および最終ベッドと冷却装置の接続と傾斜角度の調整を行う必要があり、製品切替え作業の労力が甚大であった。
【０００６】
上記以外の複合曲げガラス板の成形装置として、特開平５−９０３７号公報（米国特許第６０１４８７３明細書）、特開平６−１９１８６７号公報（米国特許第５５２２９１２明細書）、特開平８−１５１２２１号公報記載の装置が提案されている。特開平５−９０３７号公報記載の装置では、ガラス成形炉の出口近傍においてベッドが上がり勾配となっており、かつ所定の曲率を持つ上方に凸にされた複曲面形状を有する搬送面に沿って板ガラスを移送することにより複合曲げすることを特徴としている。しかしながら、単一曲げガラス板生産から複合曲げガラス板の生産へ製品切替えをする時において、ベッドの交換だけでなくベッドの傾斜角度をも精緻に調整する必要がある。さらにまた、ベッドが上がり勾配に傾けて設置されているので、次工程の冷却装置の高さレベルを高く保持できる点では好ましいものの、ガラス板に傷を発生させる点では望ましくないことがある。
【０００７】
特開平６−１９１８６７号公報記載の装置では、加熱炉の出口に近い最終ベッドはその上面が加熱炉の出口に向って前上がり形状とされ、しかも最終ベッドの上面のうち少なくとも加熱炉の出口に近い部分は板ガラスの搬送方向に沿って湾曲していることを特徴としている。しかしながら、前記特開平５−９０３７号公報に開示された技術と同様に、単一曲げガラス板から複合曲げガラス板の生産へ製品切替えをする時において、ベッドの交換だけでなくベッドの傾斜角度をも精緻に調整する必要がある。また、ベッドが上がり勾配であることは、次工程の冷却装置の高さレベルを高く保持できる点では好ましいものの、ガラス板に傷を発生させる点では望ましくないことがある。
【０００８】
本出願人の出願に係わる特開平８−１５１２２１号（特許第２８０９５９６号）公報に記載される装置を使用する場合には、ベッド支持台の上で最終ベッドを、板ガラスの搬送方向軸心からわずかな角度振るだけで複合曲げガラス板を製造する工程に切換えできるので、品種に応じて特別な最終ベッドを用意する必要がなく、また、品種切り替え時の調整が容易であることを特徴としている。しかしながら、曲率半径の小さいガラス板を製造しようとすると、最終ベッドの振り角度が大きくなり最終ベッドと一つ手前のベッドとの隙間が広がって噴出エアー圧の低下をきたすことになる。噴出エアー圧の低下により板ガラスを浮上させる浮力が低下し、搬送されてくる板ガラスはベッドと擦れを生じて傷の発生や割れが発生し易くなる。
【０００９】
【特許文献１】
特公昭４９−１０３３１号公報
【特許文献２】
特開平５−９０３７号公報
【特許文献３】
特開平６−１９１８６７号公報
【特許文献４】
特開平８−１５１２２１号公報
【００１０】
【発明が解決しようとする課題】
単一曲げガラスを生産するために建設されたガスハース曲げ成形装置を使用して複合曲げガラス板を効率よく生産する時に、まず製品となるガラスに傷を発生させることがないこと、次に、次工程の冷却装置の高さレベルが低くなりすぎないこと、さらには、曲率の異なるガラス製品を生産するための切替え作業が簡便、かつ容易であることが重要である。前記した従来技術は、特に曲率半径の小さい複合曲げガラス板を製造する際に、製品となるガラス板に傷を発生させることがないこと、次工程の冷却装置の高さレベルが低くなりすぎないことを両立させるに十分な技術であるとは言えない。さらには、曲率の異なるガラス製品を生産するための切替え作業が簡便、かつ容易であるとも言えない。本発明は上記の課題を解決することを目的とする。
【００１１】
本出願人は先に、板ガラスの複合曲げ装置の発明について特許出願（特願２００１−１１５９８４号）をした。この発明の板ガラスの複合曲げ装置は、最終ベッドの搬送面が上方に凸状のベッドであり、加熱炉の入り口側から出口側にかけて搬送方向に対してほぼ水平に設定されたベッド支持台の出口側端部における最終ベッドをベッド支持台の上にガラス板の搬送方向に傾けることなく単に載置するだけであるので、複合曲げの曲率が異なるガラス品種を生産する時の切替え作業が極めて容易である。しかしながら、曲率半径が小さくなり上方に突き出る凸状頂点の突起高さが高くなると、即ち、板ガラスが搬送されてきた方向に対して上向き勾配を形成する凸状頂点の突起高さが高くなると、ガスハース炉の操業条件によっては傷を発生し易くなることが判明した。本発明は、前記の発明の技術的背景を引継ぐものであるが、最終ベッドの形状をさらに工夫し傷の発生を極力抑えている。
【００１２】
【課題を解決するための手段】
本発明は、最終ベッドを側面側から見た時に、該最終ベッドの搬送面の凸状頂点が上方に突き出る突起高さをできるだけ低くして、かつ、該最終ベッドの出口側端部の高さレベルを上記先願発明の場合よりできるだけ高くするベッド形状とベッドの配置を特徴とする。上記先願発明のように最終ベッドの搬送面が上方に凸状のベッドを使用した場合は、板ガラス搬送方向の搬送面の曲率半径が小さい時には、凸状頂点の突起高さが大きくなり、搬送されてくる板ガラスの下面と接触し、板ガラスの下面に傷を発生し易くなる。これを回避するために、漸次ベッド搬送面の高さレベルが低減するベッドを使用すれば傷の発生は大幅に解消されるのであるが、板ガラスが最終ベッドから離れる出口側端部の高さが低くなりすぎる問題がある。出口側端部の高さが低いと、次工程の冷却装置の高さが低くなり、とりわけ最終ベッドの搬送面が搬送方向にも湾曲形状であると冷却装置の高さが可及的に低くなり、冷却装置の後半の搬送系が床レベル以下になってしまい、場合によってはピットが必要となる。
【００１３】
凸状頂点で発生する傷と冷却装置の搬送系の高さレベルとの両者の問題を解消するためには、凸状頂点の高さをある程度下げて、それに応じて出口側端部の高さを下げた最終ベッドを使用することにより両者のバランスを取ることが好ましい。このようなベッドは、曲率値が同じであれば、搬送面が入口側端部から漸次低減するベッドよりも出口側端部を高く保てる。
【００１４】
本発明の装置の最終ベッドは、入り口側端部と出口側端部の高さが同じで上方に湾曲する凸状搬送面を有するベッドであるか、入り口側端部より出口側端部の方がやや高さが低い上方に湾曲する凸状搬送面を有するベッドである。
【００１５】
もう少し具体的に説明すると、本発明の装置は、最終ベッドが板ガラスの搬送方向および搬送方向に直角なベッドの幅方向の両方向に対して所定の曲率を有する上方に湾曲する凸状の搬送面を有するベッドであり、かつ、板ガラスの搬送方向における該最終ベッドの両端部の高さレベルが、入口側端部より出口側端部の方が低い高さレベルのベッドであり、かつ、該最終ベッドの底面が加熱炉のベッド支持台の上に板ガラスの搬送方向に少なくとも上向きに傾けられることなく、即ち、搬送方向に沿って載置されているか、または搬送方向に対して下向きに傾けて載置されていることを特徴とする板ガラスの複合曲げ装置である。ここで、最終ベッドの入口側端部と出口側端部の中間部に形成された搬送面の変位点の一種である凸状頂点は入口側端部の高さレベルよりも高いレベルに設置され、該変位点から出口側端部にかけては搬送面が漸次高さレベルを低減していく上方に湾曲した形状を有する。さらに、板ガラスの搬送方向および搬送方向に直角な幅方向の両方向に対して所定の曲率を有する上方に湾曲した搬送面を有する板ガラスの冷却装置が、最終ベッドの出口側端部において、該最終ベッドの側面から見て漸次高さレベルが低減してゆく上方に湾曲した搬送面に沿って延長する方向に、即ち接線方向に、または該接線方向に対して上向きに、または該接線方向に対して下向きの傾斜状態に、最終ベッドの出口側端部に接続角度（α）を持たせて接続されることにより、板ガラスが複合曲げされる。
【００１６】
本発明により、最終ベッドの出口側端部の高さレベルを前記先願発明の場合よりもできるだけ高く保持すると同時に、板ガラスに傷を発生させることの少ない最終ベッドと板ガラスの複合曲げ装置を提供できる。
【００１７】
【発明の実施の形態】
本発明により、ガスハース曲げ法による曲げガラス板の生産において、単一曲げガラス板と複合曲げガラス板とを同一のガスハース炉を使用して生産する時に、最終ベッドを複合曲げガラス用のベッドに交換したとしても最終ベッドで傷が発生せず、かつ最終ベッドに接続される冷却装置の搬送系のレベルを比較的高く保つことのできる複合曲げガラス板の成形装置が提供される。さらに望ましくは、品種切替え時における最終ベッドのレベル調整作業の簡便さを失うことがなく、ガスハース曲げ法の特徴である高い生産効率を維持できる複合曲げガラス板の成形装置が提供される。
【００１８】
本発明の装置における最終ベッドは、板ガラスの搬送方向と直角なベッドの幅方向に対する該ベッドの搬送面がガラス製品の曲率にほぼ一致する所定の曲率を有する上方に湾曲する形状であり、かつ、板ガラスの搬送方向に対する搬送面は、ベッドの側面側から見たときに、上方に湾曲する凸状頂点を有するベッドである。湾曲搬送面の曲率半径が小さく凸状頂点が入口側端部の高さレベルよりもあまりにも高くなりすぎると傷を発生しやすくなるので、該最終ベッドは、入口側端部の高さレベルより出口側端部の高さレベルの方が低いレベルとなるような形状、または配置とする。このような最終ベッドの搬送面は、入口側端部の高さレベルから変位点となる頂点にかけて上がり勾配となり、頂点以降は下がり勾配となって、出口側端部の高さレベルは入口側端部の高さレベルよりもやや低くなる。最終ベッド底面の入り口側端部を基点としてベッドを搬送方向に下向きに傾ける場合、上がり勾配を形成しないところまで凸状頂点の位置を下げてしまうと出口側端部の高さレベルが低くなりすぎて、次工程の冷却装置の高さレベルの確保に支障をきたす。
【００１９】
入口側端部の高さレベルより出口側端部の高さレベルが低いベッドは、入口側端部の高さより他方の出口側端部の高さの方が低いベッドを予め作製しておくか、または、ガスハース炉の出口側端部にある最終ベッドのベッド支持台のみを搬送方向に対して下向きに傾けて設定しておいて、支持台の上に最終ベッドを載置することにより、最終ベッドの出口側端部の高さレベルを低くできる。例えば、入り口側端部と出口側端部の高さが同じで上方に湾曲する凸状搬送面を有するベッドを、搬送方向に対して下向きに傾けて設定された支持台に載置することにより、出口側端部の高さレベルをある程度高く保持しつつ、ガラス板が搬送されてくる方向に対して凸状頂点が突出する高さを低くして傷の発生を防止することができる。前記２者のうち、品種切替え時における最終ベッドのレベル調整作業の簡便さを失わないためには、入口側端部の高さより出口側端部の高さの方が低いベッドを予め作製しておくのが好ましい。本出願人の出願に係わる特開平８−１５１２２１号に開示した技術に関連する下り勾配に傾斜した冷却装置の取替え作業に際しては、冷却装置の角度調整と最終ベッドとのレベル調整作業に熟練とかなりの作業時間とを必要としている。同様に、ベッドを傾斜して設置するには、傾斜角度とレベルを調整するのに高度の熟練度と貴重な作業時間が必要とされることになる。
【００２０】
個々のガスハース炉が有する固有の操業条件によっては、例えば、最大加熱量、または、ベッド上面に形成された孔から噴出するガラス板浮上用のエアー圧力等の条件によっては、入口側端部の高さレベルより高い位置に頂点部を有する搬送面でない最終ベッドの方が望ましい場合がある。即ち、上がり勾配レベルを形成することは板ガラスの下面に傷を発生させ易くなる場合がある。このようなガスハース炉の場合に、傷の発生を解決するために入口側端部から出口側端部にかけて漸次高さレベルが低減していく形状の最終ベッドを使用すると、出口側端部の高さレベルが低くなりすぎて好ましくないことが判った。とりわけ上方に湾曲した形状のベッドである時は、出口側端部の高さレベルが次工程の冷却装置の搬送系の高さに顕著に影響する。
【００２１】
図１は、最終ベッドの出口側端部の高さレベルと冷却装置の搬送系端末部の高さレベルの関係を示しており、入口側端部から漸次高さレベルが低減する例を破線で示し、ベッド中央部の変位点から高さレベルが低減する例を実線で示した。円弧で表わされた湾曲形状のベッドの場合は、出口側端部の高さレベルの差が、冷却装置の搬送系端末部の高さレベルの差に可及的に影響していることが判る。板ガラスの搬送方向に対して、ベッドと冷却装置の搬送面が２００００ｍｍの曲率半径を有し、ベッド長さが７６２ｍｍ、冷却装置の搬送面に沿っての円弧状の長さが約２０００ｍｍである装置の場合、変位点の位置が入口側端部にあるときは出口側端部は約１４．５ｍｍ低くなり、冷却装置のガラス板取出口においては約１９０ｍｍの高さ低減となる。一方、同じベッド長さと同じ冷却装置長さで変位点が最終ベッドの中央点にあるときは、出口側端部は約３．６ｍｍ低くなり、冷却装置のガラス板取出口においては約１４２ｍｍの高さ低減となる。冷却装置から排出された板ガラスは、さらに冷却装置の搬送面の延長線上に下り勾配に搬送されるので、冷却装置に接続する搬送系は上記の高さレベルよりもさらに下方になり、同時に、高さレベルの差も拡大する。
【００２２】
図３におけるベッド搬送面の湾曲形状は代表的には生産品種のガラスの曲率とほぼ一致する円弧の一部であるが、円弧とは限定されない。滑らかな曲線を描く搬送面であってもよい。いずれも、同一の最終ベッドを使用して複合曲げガラス板の曲率をある程度まで変更し、調整することができる。例えば、加熱炉の出口側近傍の温度調整、最終ベッドと冷却装置の接続角度を変更すること等により板ガラスの搬送方向の曲率をある程度まで変更し調整することができる。これにより品種切替の際に製品に要求される曲率毎に逐一最終ベッドを準備する必要がなくなる。
【００２３】
ガスハース炉は板ガラスの搬送される方向に幾つかの温度制御ゾーンに分れていて、それぞれのゾーンを目標温度に設定できる。このうち最終段階の数ゾーンの温度を調整することにより、板ガラスの搬送方向の曲率を調整できることを見いだした。特に最終段階の３ゾーンの温度は複合曲げガラス板の曲率値の調整に対して敏感に応答する。最終段階の数ゾーンはガスハース炉全長の２０％程度であり、３ゾーンは１５％程度に相当する。ガスハース炉の最終段階の数ゾーンの温度を制御することは、同一の最終ベッドを使用して複合曲げガラス板の曲率値を調整する上で極めて有効な方法であることが判明した。
【００２４】
最終ベッドに接続される冷却装置は、最終ベッドの出口側端部における搬送面に沿って延長する方向に、即ち接線方向に、冷却装置の接続端部における搬送面の接線方向を合わせて滑らかな搬送面となるように接続されるのが標準の設置である。しかしながら、最終ベッドの出口側端部における該最終ベッドの搬送面に沿って延長する方向に対して、即ち接線方向に対して冷却装置を上下方向に微小角度偏差させて（図４参照）、即ち、冷却装置の接続角度を該接線方向に対して±αの微小角度だけ上下方向に傾斜させることによって、複合曲げガラス板の板ガラスの搬送方向の曲率値を調整できることが判明した。
【００２５】
さらには、ガスハース炉の最終段階の数ゾーンの温度を制御することと、冷却装置の接続角度αを調整すること等の組合わせ操作により、更に任意に複合曲げガラス板の曲率値を調整できる。なお、接続角度αの調整は、冷却装置の下部エアーブロー冷却装置を４隅で支えている４本の支柱に予め取付けてあるジャッキボルトにより高さと傾き角度を調整して行う。
【００２６】
以下、図面を参照しながら、本発明を詳細に説明する。図２は、本発明の装置におけるガスハース法による板ガラスの複合曲げ装置の形態を示す縦断面図である。図３は、本発明の装置における最終ベッドを側面側から見た縦断面図を図示しており、搬送面が入口側端部より高いレベルに変位点の一種である頂点部を有する形態のベッドを示す。
【００２７】
図５は、最終ベッドが搬送方向に下向きに傾けられて載置された時の図であって、破線で示される最終ベッドＡは入り口側端部の高さより出口端部の高さが低いベッドであり、実線で示される最終ベッドＢは入り口端部と出口端部の高さが等しいベッドである。上記最終ベッドＡ、Ｂの搬送面は、搬送方向と、搬送方向に直角であるベッドの幅方向に対して上方に凸状の湾曲面を有しており、該最終ベッドは入り口側端部と出口側端部の間にある最も高いレベルとなる搬送面の最高位置が入り口側端部より高くなり、出口側端部は入り口側端部より低い高さレベルとなるようにベッド支持台上に載置されている。これにより、出口側端部をできるだけ高く保持することができ、さらに板ガラスが搬送されてくる方向に対する凸状頂点の突出高さを比較的低くして板ガラスに傷が発生することを防止できる最終ベッドの配置となる。
【００２８】
図４は、最終ベッドと冷却装置の接続角度を示しており、最終ベッドの出口側端部において搬送面に沿って延長する方向、即ち接線方向９に対して角度±α以内で接続角度を調整する。いずれのベッドも曲率を強調して描かれており、実物においては湾曲形状を目視するのが難しいほどの曲率である。
【００２９】
図２に示すように、ガスハース炉１はトンネル型の加熱炉であり、その中には複数のハースベッド２が直線的に配設され、炉１の出口部に冷却装置２０が接続されている。ガスハースベッド２の上面はガスハース炉の上流側、即ち、入口側では平面であるが、下流側に向うに従い少しずつ搬送方向と直角のベッドの幅方向に曲げられて次第に曲率半径の小さい曲面となり、下流側の最終ベッドを含む複数個のベッド２は、ベッド幅方向に対して、成形しようとする製品の曲率に曲げ加工されている。また、全てのベッドの上面には図示されていない多数の孔が穿孔され、該孔から噴出する高温ガスにより板ガラス１０をベッド上２に浮上し、浮上した板ガラス１０を駆動装置により入口側から出口側へと搬送する。
【００３０】
ガスハース炉の全てのベッド、２と５は、ガスハース炉の片方の側に沿って炉の入口側から出口側にかけて設置されている、図示されていない駆動チェーンの側において水平面に対し数度下げて傾けられており、板ガラス１０を図示されていない搬送治具に係止しやすくなるような配置とされている。即ち、全てのベッド支持台は、上流側から下流側にかけて、数度の同一角度で傾いて設置されている。最終ベッドを単にベッド支持台に載置することとは、数度傾いているベッド支持台の上にベッドの底面を板ガラスの搬送方向には傾けることなく載置することを意味している。
【００３１】
【実施例】
実施例１
図２に示されるように、ガスハース曲げ装置内に配列された複数のハースベッドのうち最終ベッドが、板ガラスの搬送方向に直角であるベッドの幅方向に対して所定の曲率を有し、かつ側面側からみたベッド形状が上方に湾曲した図３に示されるような搬送面を有する形態のベッドに交換され、該ベッドの底面がガスハース炉の出口側端部のベッド支持台の上に、板ガラスの搬送方向には傾けることなく単に載置された。
【００３２】
該最終ベッドは板ガラスの搬送方向の曲率半径を２００００ｍｍ、搬送方向に直角なベッドの幅方向の曲率半径を１２５０ｍｍとするベッドであった。即ち、該最終ベッドは板ガラスの搬送方向の全長に亘って前記曲率半径を有する上方に湾曲した複合形状の搬送面を有しており、曲率半径の中心点を入口側端部からベッド長の１／３の位置（２５４ｍｍ）に設定すると、変位点となる凸状頂点は入口側端部よりも約１．６ｍｍ高く突出し、出口側端部は入口側端部よりも△ｈ＝約５ｍｍ低い形状であった。さらに、冷却装置は板ガラスの搬送方向および搬送方向に直角な幅方向の両方向に対して所定の曲率半径を有しており、該冷却装置は最終ベッドの出口側端部において搬送面に沿って延長する方向、即ち図４に示される接線方向９に対して接続角度αを下向きに０．２度（即ち、−０．２度）として、最終ベッドの出口側端部に搬送面を揃えて接続された。
【００３３】
この装置に８２０ｍｍ×５２０ｍｍ寸法で板厚３．５ｍｍの板ガラスを投入し曲げ成形したところ、板ガラスの搬送方向の曲率半径が２２３３０ｍｍの複合曲げガラス板を得ることができ、自動車用窓ガラス板として好適なものであった。
【００３４】
【発明の効果】
本発明に係わるガスハース曲げ装置と複合曲げガラスの成形方法は、単一曲げガラス板と複合曲げガラス板とを同一のガスハース炉を使用して生産する時に、最終ベッドを複合曲げガラス用のベッドに交換したとしても最終ベッドで傷が発生せず、かつ最終ベッドに接続される冷却装置の搬送系のレベルを比較的高く保つことのできる複合曲げガラス板の成形装置であり、さらに望ましくは、品種切替え時における最終ベッドのレベル調整作業の簡便さを失うことがなく、ガスハース曲げ法の特徴である高い生産効率を維持できる複合曲げガラス板の成形装置である。さらに、最終ベッドの出口側端部において搬送面に沿って延長する方向、即ち接線方向に冷却装置を接続角度αで接続することにより、傷を発生させることなく複合曲げガラス板を効率よく生産できる。さらにまた、冷却装置の搬送系の高さレベルが低くなりすぎて、床にピットを掘ったり、床面近くでの搬送装置の調整作業に難渋したりすることがない。
【図面の簡単な説明】
【図１】最終ベッドの出口側端部の高さレベルと冷却装置の高さレベルの関係を示す図。
【図２】本発明の装置であるガスハース炉の縦断面図。
【図３】本発明の装置の実施例における最終ベッドの縦断面図。
【図４】本発明の装置の実施例における最終ベッドと冷却装置の接続角度を示す縦断面図。
【図５】最終ベッド（破線の最終ベッドＡは入り口側端部より出口端部の高さが低いベッド、実線の最終ベッドＢは入り口端部と出口端部の高さが等しいベッド）が搬送方向に傾けられて載置された時の図。
【符号の説明】
１ ガスハース炉
２ ガスハースベッド
４ ベッド支持台
５ 最終ベッド
７ 高さレベルの変位点
８ 高さレベルの変位点としての頂点
９ 最終ベッド搬送面の出口側端部における接線
１０ 板ガラス
２０ 冷却装置
２１ 冷却装置用エアーダクト管
２２ 上部エアーブロー急冷装置
２３ 下部エアーブロー急冷装置
２４ 冷却装置（下部エアーブロー）の搬送面
２５ 冷却装置のロール搬送系[0001]
BACKGROUND OF THE INVENTION
The present invention includes a composite bending apparatus of the glass sheet for molding a glass plate having a combined curved surface like a window glass for an automobile, about the composite method for bending a glass sheet using said apparatus. The glass plate having a compound curved surface in this specification is a three-dimensional plate glass having a curved surface around an orthogonal XY axis, and in particular, curved in a convex shape only on one of the positive and negative of the Z axis. A glass plate having a desired curvature.
[0002]
[Prior art]
The curved glass plate used for window glass for automobiles is a gravity bending method in which the plate glass placed on the mold is heated and softened and suspended by gravity to bend, and the plate glass heated using the die is press-bended. It is bent by the press bending method, the gas hearth bending method in which the plate glass is floated and moved by the high-temperature gas ejected from the hearth bed, the roller hearth bending method in which the plate glass is bent in accordance with the shape of the transport roll while being rolled. Depending on the size and shape of the curved glass plate, they are properly used.
[0003]
The method of bending with a gas hearth furnace is highly productive and has the advantage that it can be produced at low cost. However, the single bent glass plate has a curvature with respect to the width direction of the bed perpendicular to the conveying direction of the glass plate. However, it is not easy to manufacture a composite bent glass sheet bent in the conveying direction. Below, the conveyance direction of a glass plate is made into the longitudinal direction of a bed, and the direction orthogonal to the conveyance direction crossing a longitudinal direction is expressed as the width direction of a bed. In the gas hearth bending method, hot glass is ejected over a hearth bed continuously arranged in a heating furnace through a gas jet port penetrating from the back surface of the bed to the surface substantially perpendicularly to the hearth bed surface. The plate glass is heated while being conveyed from the inlet side to the outlet side of the heating furnace, and gradually bent into a shape following the hearth bed by the weight of the plate glass.
[0004]
In order to continuously form a composite bent glass plate having a radius of curvature of several tens of thousands mm in the conveying direction, by cooling the glass plate in a high-temperature softened state while conveying the plate glass in a curved direction, for example, downward. It is necessary to solidify into a desired curved shape.
[0005]
An apparatus described in Japanese Patent Publication No. 49-10331 (U.S. Pat. No. 3,409,422) is well known as an apparatus for compoundly bending plate glass in the conveying direction. This device is a composite in which the transport surface of a plurality of hearth beds after the bed close to the end of the gas hearth furnace and the transport surface of the cooling device connected to the final bed at the gas hearth outlet are also curved in the transport direction of the plate glass. It is a curved surface. The composite curved surface bed and the cooling device are devices that bend the plate glass into a composite curved surface by being disposed so as to be gradually inclined downward in the conveying direction. In this apparatus, since the bed and the cooling apparatus are sequentially connected downward, there is a problem that the height level taken out as the final product becomes too low. In addition, when switching between the production of a single bent glass plate and a composite bent glass plate, it is necessary to replace a plurality of beds close to the end in the heating furnace and a cooling device connected to the beds, In addition, it is necessary to adjust the inclination angle and connection between the plurality of beds, and to connect the final bed and the cooling device and to adjust the inclination angle, and the labor for the product switching work is great.
[0006]
As other composite bent glass plate forming apparatuses, JP-A-5-9037 (US Pat. No. 6,014,873), JP-A-6-191867 (US Pat. No. 5,522,912), and JP-A-8-151122. A device described in the publication has been proposed. In the apparatus described in Japanese Patent Application Laid-Open No. 5-9037, the bed has an upward slope in the vicinity of the exit of the glass forming furnace, and along the conveying surface having a double curved surface shape having an upward convex shape with a predetermined curvature. It is characterized by compound bending by transferring plate glass. However, when the product is switched from the production of a single bent glass plate to the production of a composite bent glass plate, it is necessary to precisely adjust not only the bed change but also the bed inclination angle. Furthermore, since the bed is set up with a slope, it is preferable in that the height level of the cooling device in the next process can be kept high, but it may not be desirable in terms of causing scratches on the glass plate.
[0007]
In the apparatus described in Japanese Patent Application Laid-Open No. 6-191867, the final bed close to the outlet of the heating furnace is shaped so that the upper surface of the final bed rises toward the outlet of the heating furnace, and at least at the outlet of the heating furnace of the upper surface of the final bed. The near portion is characterized by being curved along the conveying direction of the plate glass. However, in the same way as the technique disclosed in Japanese Patent Laid-Open No. 5-9037, when the product is switched from the single bent glass plate to the production of the composite bent glass plate, not only the bed change but also the bed inclination angle. Need to be finely adjusted. In addition, it is preferable that the bed has a rising slope in terms of maintaining a high height level of the cooling device in the next process, but it may not be desirable in terms of causing scratches on the glass plate.
[0008]
When using the apparatus described in Japanese Patent Application Laid-Open No. 8-151221 (Patent No. 2809596) related to the applicant's application, the final bed on the bed support is slightly from the axis of the plate glass in the conveyance direction. Since it is possible to switch to a process for producing a composite bent glass plate by simply swinging it at a specific angle, it is not necessary to prepare a special final bed according to the type, and it is easy to adjust when switching the type. However, if an attempt is made to produce a glass plate having a small radius of curvature, the swing angle of the final bed will increase, and the gap between the final bed and the previous bed will widen, resulting in a reduction in the jet air pressure. The buoyancy that causes the glass sheet to float is reduced due to a decrease in the blown air pressure, and the conveyed glass sheet is rubbed with the bed, so that scratches and cracks are likely to occur.
[0009]
[Patent Document 1]
Japanese Patent Publication No.49-10331 [Patent Document 2]
JP-A-5-9037 [Patent Document 3]
JP-A-6-191867 [Patent Document 4]
JP-A-8-151221
[Problems to be solved by the invention]
When a composite bent glass sheet is efficiently produced using a gas hearth bending apparatus constructed to produce a single bent glass, the glass used as a product should not be damaged. It is important that the height level of the cooling device in the process does not become too low, and that the switching operation for producing glass products having different curvatures is simple and easy. The above-described prior art does not cause damage to the glass plate as a product, and the height level of the cooling device in the next process does not become too low, particularly when manufacturing a composite bent glass plate having a small curvature radius. It cannot be said that the technology is sufficient to achieve both. Furthermore, it cannot be said that the switching operation for producing glass products having different curvatures is simple and easy. The present invention aims to solve the above-described problems.
[0011]
The present applicant has previously filed a patent application (Japanese Patent Application No. 2001-115984) regarding the invention of a compound glass bending apparatus. The plate glass composite bending apparatus according to the present invention is such that the transport surface of the final bed is an upwardly convex bed, and the exit of the bed support is set substantially horizontal to the transport direction from the entrance side to the exit side of the heating furnace. Since the final bed at the side end is simply placed on the bed support without tilting in the direction of glass plate transfer, the switching work when producing glass varieties with different curvatures of compound bending is extremely easy. is there. However, if the radius of curvature decreases and the projection height of the convex vertex protruding upward increases, that is, if the projection height of the convex vertex forming an upward gradient with respect to the direction in which the plate glass has been conveyed increases, It was found that scratches are likely to occur depending on the operating conditions of the furnace. The present invention takes over the technical background of the invention described above, but the shape of the final bed is further devised to suppress the generation of scratches as much as possible.
[0012]
[Means for Solving the Problems]
According to the present invention, when the final bed is viewed from the side, the height of the protrusion at which the convex apex of the transport surface of the final bed protrudes upward is made as low as possible, and the height of the end on the outlet side of the final bed It is characterized by a bed shape and bed arrangement that make the level as high as possible in the case of the prior invention. When using a bed whose convex surface is upwardly convex as in the above-mentioned prior application, when the radius of curvature of the conveying surface in the sheet glass conveying direction is small, the protrusion height of the convex vertex becomes large, It comes into contact with the lower surface of the plate glass, and the lower surface of the plate glass is likely to be damaged. In order to avoid this, the use of a bed that gradually reduces the height level of the bed conveyance surface will greatly eliminate the occurrence of scratches, but the height of the end on the exit side where the plate glass separates from the final bed is reduced. There is a problem that is too low. If the height of the outlet side end is low, the cooling device in the next process will be low. In particular, if the transport surface of the final bed is also curved in the transport direction, the cooling device will be as low as possible. Therefore, the transport system in the latter half of the cooling device becomes below the floor level, and in some cases, pits are required.
[0013]
In order to eliminate the problems of both the scratches occurring at the convex vertex and the height level of the cooling system transport system, the height of the convex vertex is lowered to some extent and the height of the outlet end is accordingly adjusted. it preferred to take a balance between the two by using the final bed lowered. Bed like this, if the curvature values are the same, maintain high exit end than bed conveying surface is gradually reduced from the inlet side end portion.
[0014]
The final bed of the apparatus of the present invention, or a bed having a convex transport surface the height of the inlet Ri mouth end and the outlet end is curved upwardly the same, the outlet end from the entrance end This is a bed having a convex conveying surface that is slightly lower and is curved upward.
[0015]
More specifically, the apparatus of the present invention has an upwardly curved convex conveyance surface having a predetermined curvature with respect to both the conveyance direction of the glass sheet and the width direction of the bed perpendicular to the conveyance direction. A bed having a height level at both ends of the final bed in the conveyance direction of the glass sheet, and a level at which the outlet end is lower than the end at the entrance, and the final bed The bottom surface of the heater is placed on the bed support of the heating furnace without being inclined at least upward in the sheet glass conveying direction, that is, placed along the conveying direction or inclined downward with respect to the conveying direction. it is a composite bending apparatus of the glass sheet, characterized in Tei Rukoto. Here, the convex vertex, which is a kind of displacement point of the conveying surface formed at the intermediate portion between the inlet side end portion and the outlet side end portion of the final bed, is installed at a level higher than the height level of the inlet side end portion. From the displacement point to the outlet side end, the conveying surface has an upward curved shape that gradually reduces the height level. Further, a sheet glass cooling device having an upward curved conveying surface having a predetermined curvature with respect to both the conveying direction of the sheet glass and the width direction perpendicular to the conveying direction is provided at the end of the final bed at the end of the final bed. In a direction extending along the upwardly curved conveying surface, i.e. tangentially, upwardly with respect to the tangential direction or with respect to the tangential direction. The plate glass is subjected to compound bending by being connected with a connection angle (α) at the outlet side end portion of the final bed in the downward inclined state.
[0016]
According to the present invention, it is possible to provide a composite bending apparatus for a final bed and a plate glass that keeps the height level of the end portion on the outlet side of the final bed as high as possible as compared with the invention of the prior application, and at the same time, hardly causes scratches on the plate glass. .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention, in the production of a bent glass plate by the gas hearth bending method, when a single bent glass plate and a composite bent glass plate are produced using the same gas hearth furnace, the final bed is replaced with a composite bent glass bed. Even if it does, a damage | wound does not generate | occur | produce in a final bed, and the shaping | molding apparatus of the composite bending glass plate which can keep the level of the conveyance system of the cooling device connected to a final bed comparatively high is provided. More desirably, there is provided an apparatus for forming a composite bent glass plate capable of maintaining high production efficiency, which is a feature of the gas hearth bending method, without losing the simplicity of the final bed level adjustment operation at the time of product type switching.
[0018]
The final bed in the apparatus of the present invention has a shape in which the conveyance surface of the bed with respect to the width direction of the bed perpendicular to the conveyance direction of the plate glass is curved upward with a predetermined curvature substantially matching the curvature of the glass product, and The conveyance surface with respect to the conveyance direction of plate glass is a bed having a convex apex that curves upward when viewed from the side surface side of the bed. Since the curvature radius of the curved conveying surface is small and the convex apex is too high than the height level of the entrance end, the final bed is more likely than the height level of the entrance end. The shape or arrangement is such that the height of the outlet side end is lower. The transport surface of such a final bed has an upward slope from the height level of the inlet side end to the apex that is the displacement point, and a downward slope after the apex, and the height level of the outlet side end is the inlet side end. Slightly lower than the height level of the part. When the bed is tilted downward in the transport direction starting from the entrance end on the bottom of the final bed, the height level of the exit end becomes too low if the convex vertex is lowered to a point where no upward gradient is formed. This hinders securing the height level of the cooling device in the next process.
[0019]
Whether the bed whose outlet side end portion has a lower height level than the inlet side end portion has a bed in which the other outlet side end portion has a lower height than the inlet side end portion. Or, by setting the bed support of the final bed at the outlet side end of the gas hearth furnace to be inclined downward with respect to the transfer direction, and placing the final bed on the support, the final The height level of the exit end of the bed can be lowered. For example, by placing a bed having a convex conveyance surface that has the same height at the entrance side end and the exit side end and curves upward, on a support table that is inclined downward with respect to the conveyance direction. In addition, while maintaining the height level of the outlet side end portion to be high to some extent, the height at which the convex apex protrudes in the direction in which the glass plate is conveyed can be lowered to prevent the occurrence of scratches. Of the two, in order not to lose the level adjustment work of the final bed at the time of product changeover, a bed having a lower exit side end than the entrance end is prepared in advance. It is preferable to leave. When replacing a cooling device inclined in a downward slope related to the technique disclosed in Japanese Patent Application Laid-Open No. 8-151221 relating to the application of the present applicant, the angle adjustment of the cooling device and the level adjustment work of the final bed are quite skilled. Need working hours. Similarly, installing the bed tilted requires a high degree of skill and valuable work time to adjust the tilt angle and level.
[0020]
Depending on the specific operating conditions of each gas hearth furnace, for example, depending on conditions such as the maximum heating amount or the air pressure for levitation of the glass plate ejected from the hole formed on the bed upper surface, It may be desirable to have a final bed that is not a transport surface with a vertex at a position higher than the height level. That is, forming the rising gradient level may easily cause scratches on the lower surface of the glass sheet. In the case of such a gas hearth furnace, if a final bed having a shape in which the height level gradually decreases from the inlet side end to the outlet side end in order to solve the occurrence of scratches, the height of the outlet side end is used. It was found that the level was too low to be preferable. In particular, when the bed has an upwardly curved shape, the height level of the outlet side end portion significantly affects the height of the transport system of the cooling device in the next process.
[0021]
FIG. 1 shows the relationship between the height level of the outlet side end portion of the final bed and the height level of the transport system terminal portion of the cooling device. An example in which the height level gradually decreases from the inlet side end portion is indicated by a broken line. An example in which the height level is reduced from the displacement point at the center of the bed is shown by a solid line. In the case of a curved bed represented by an arc, the difference in the height level of the outlet side end may affect the difference in the height level of the conveying system terminal of the cooling device as much as possible. I understand. An apparatus in which the conveyance surface of the bed and the cooling device has a radius of curvature of 20000 mm, the bed length is 762 mm, and the arc-shaped length along the conveyance surface of the cooling device is about 2000 mm with respect to the conveyance direction of the plate glass In this case, when the position of the displacement point is at the inlet side end, the outlet side end is lowered by about 14.5 mm, and at the glass plate outlet of the cooling device, the height is reduced by about 190 mm. On the other hand, when the displacement point is at the center point of the final bed with the same bed length and the same cooling device length, the outlet side end is about 3.6 mm lower, and the glass plate outlet of the cooling device is about 142 mm high. Reduction. Since the plate glass discharged from the cooling device is further transported in a downward gradient on the extended line of the transport surface of the cooling device, the transport system connected to the cooling device is further below the above-mentioned height level, The difference in level is also expanded.
[0022]
The curved shape of the bed conveyance surface in FIG. 3 is typically a part of an arc that substantially matches the curvature of the glass of the production type, but is not limited to an arc. The conveyance surface which draws a smooth curve may be sufficient. In either case, the curvature of the composite bent glass sheet can be changed to some extent and adjusted using the same final bed. For example, the curvature in the conveyance direction of the plate glass can be changed and adjusted to some extent by adjusting the temperature near the outlet side of the heating furnace, changing the connection angle between the final bed and the cooling device, or the like. This eliminates the need to prepare a final bed for each curvature required for the product at the time of product type switching.
[0023]
The gas hearth furnace is divided into several temperature control zones in the direction in which the glass sheet is conveyed, and each zone can be set to a target temperature. Of these, it has been found that the curvature in the conveying direction of the plate glass can be adjusted by adjusting the temperature of several zones in the final stage. In particular, the temperature in the last three zones is sensitive to the adjustment of the curvature value of the composite bent glass sheet. Several zones in the final stage are about 20% of the total length of the gas hearth furnace, and three zones correspond to about 15%. Controlling the temperature in the last few zones of the gas hearth furnace has proved to be a very effective way to adjust the curvature value of a composite bent glass sheet using the same final bed.
[0024]
The cooling device connected to the final bed is smooth by aligning the tangential direction of the conveying surface at the connecting end of the cooling device in the direction extending along the conveying surface at the outlet side end of the final bed, that is, in the tangential direction. It is standard installation that is connected so as to be a transfer surface. However, the cooling device is slightly deviated in the vertical direction with respect to the direction extending along the transport surface of the final bed at the outlet side end of the final bed, that is, the tangential direction (see FIG. 4 ), It has been found that the curvature value in the conveying direction of the plate glass of the composite bent glass plate can be adjusted by inclining the connection angle of the cooling device in the vertical direction by a minute angle of ± α with respect to the tangential direction.
[0025]
Further, the curvature value of the composite bent glass plate can be further arbitrarily adjusted by a combination operation such as controlling the temperature of several zones in the final stage of the gas hearth furnace and adjusting the connection angle α of the cooling device. The connection angle α is adjusted by adjusting the height and inclination angle with jack bolts attached in advance to the four columns supporting the lower air blow cooling device of the cooling device at the four corners.
[0026]
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 2 is a longitudinal sectional view showing a form of a plate glass compound bending apparatus by the gas hearth method in the apparatus of the present invention. Figure 3 is a configuration having an apex portion of the final bed Ri Contact illustrates a longitudinal sectional view seen from the side, which is a kind of displacement point conveyance surface at a higher level than the inlet end of the apparatus of the present invention Showing the bed .
[0027]
FIG. 5 is a view when the final bed is placed while being inclined downward in the transport direction, and the final bed A indicated by a broken line is a bed whose outlet end is lower than the height of the inlet side end. The final bed B indicated by the solid line is a bed having the same height at the entrance end and the exit end. The transport surfaces of the final beds A and B have a curved surface that is convex upward with respect to the transport direction and the width direction of the bed that is perpendicular to the transport direction. On the bed support so that the highest level of the transport surface at the highest level between the outlet side edges is higher than the inlet side edge, and the outlet side edge is lower than the inlet side edge. It is placed. As a result, the final bed can hold the outlet side end as high as possible, and further prevent the plate glass from being scratched by lowering the protruding height of the convex vertex with respect to the direction in which the plate glass is conveyed. It becomes arrangement of.
[0028]
FIG. 4 shows the connection angle between the final bed and the cooling device, and the connection angle is adjusted within an angle ± α with respect to the direction extending along the transfer surface at the outlet side end of the final bed, that is, the tangential direction 9. To do. All the beds are drawn with an emphasis on the curvature, and the curvature is such that it is difficult to visually observe the curved shape in the actual object.
[0029]
As shown in FIG. 2, the gas hearth furnace 1 is a tunnel-type heating furnace, in which a plurality of hearth beds 2 are linearly arranged, and a cooling device 20 is connected to an outlet portion of the furnace 1. . The upper surface of the gas hearth bed 2 is a plane on the upstream side of the gas hearth furnace, that is, on the inlet side, but is gradually bent in the width direction of the bed perpendicular to the transport direction toward the downstream side and gradually becomes a curved surface with a small curvature radius. The plurality of beds 2 including the final bed on the downstream side are bent to the curvature of the product to be molded in the bed width direction. In addition, a large number of holes (not shown) are formed on the upper surfaces of all the beds, and the plate glass 10 is floated on the bed 2 by the high-temperature gas ejected from the holes, and the floated plate glass 10 is exited from the entrance side by a driving device. It conveyed to the side.
[0030]
All beds, 2 and 5 of the gas hearth furnace are set down from the inlet side to the outlet side of the furnace along one side of the gas hearth furnace. It is inclined and arranged so that the plate glass 10 can be easily locked to a conveyance jig (not shown). That is, all the bed support stands are inclined at the same angle of several degrees from the upstream side to the downstream side. Simply placing the final bed on the bed support means that the bottom of the bed is placed on the bed support tilted several degrees without being tilted in the sheet glass transport direction.
[0031]
【Example】
Example 1
As shown in FIG. 2, the final bed among the plurality of hearth beds arranged in the gas hearth bending apparatus has a predetermined curvature with respect to the width direction of the bed perpendicular to the sheet glass conveyance direction, and has a side surface. bed shape viewed from the side is exchanged on the bed in the form states that have a conveying surface as shown in FIG. 3 which is curved upward, on the bottom surface of the bed of the support bed outlet end of Gasuhasu furnace It was simply placed without tilting in the sheet glass transport direction.
[0032]
The final bed was a bed in which the radius of curvature in the conveyance direction of the plate glass was 20000 mm and the curvature radius in the width direction of the bed perpendicular to the conveyance direction was 1250 mm. That is, the final bed has an upwardly curved composite surface having the radius of curvature over the entire length of the plate glass in the conveyance direction, and the center point of the radius of curvature is set to 1 of the bed length from the end on the inlet side. When set to the position of / 3 (254 mm), the convex vertex that becomes the displacement point protrudes about 1.6 mm higher than the inlet side end, and the outlet side end is Δh = about 5 mm lower than the inlet side end. Met. Further, the cooling device has a predetermined radius of curvature with respect to both the conveyance direction of the plate glass and the width direction perpendicular to the conveyance direction, and the cooling device extends along the conveyance surface at the end of the exit side of the final bed. The connection angle α is 0.2 degrees downward (ie, −0.2 degrees) with respect to the tangential direction 9 shown in FIG. 4 , and the transport surface is aligned at the end of the exit side of the final bed. It was done.
[0033]
When a plate glass having a size of 820 mm × 520 mm and a thickness of 3.5 mm is put into this apparatus and bent, a composite bent glass plate having a radius of curvature of 22330 mm in the conveyance direction of the plate glass can be obtained, which is suitable as a window glass plate for automobiles. It was something.
[0034]
【The invention's effect】
The gas hearth bending apparatus and the composite bent glass forming method according to the present invention are produced by using the same gas hearth furnace to produce a single bent glass plate and a composite bent glass plate as a composite bent glass bed. Even if it is replaced, it is a composite bent glass sheet forming device that does not cause scratches in the final bed and that can keep the level of the cooling system transport system connected to the final bed relatively high. This is an apparatus for forming a composite bent glass plate that can maintain the high production efficiency that is characteristic of the gas hearth bending method without losing the simplicity of the level adjustment work of the final bed at the time of switching. Furthermore, by connecting the cooling device at the connection angle α in the direction extending along the conveyance surface at the exit side end portion of the final bed, that is, the tangential direction, it is possible to efficiently produce a composite bent glass plate without causing scratches. . Furthermore, the height level of the conveying system of the cooling device does not become too low, so that pits are not dug in the floor and adjustment work of the conveying device near the floor surface is not difficult.
[Brief description of the drawings]
FIG. 1 is a diagram showing a relationship between a height level of an end portion on an outlet side of a final bed and a height level of a cooling device.
FIG. 2 is a longitudinal sectional view of a gas hearth furnace which is an apparatus of the present invention.
FIG. 3 is a longitudinal sectional view of the final bed in the embodiment of the apparatus of the present invention.
FIG. 4 is a longitudinal sectional view showing a connection angle between a final bed and a cooling device in an embodiment of the apparatus of the present invention.
[Fig. 5 ] Conveys the final bed (the last bed A in the broken line is a bed whose outlet end is lower than the end on the entrance side, and the last bed B in the solid line is a bed having the same height at the entrance end and the exit end) The figure when it is placed tilted in the direction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gas hearth furnace 2 Gas hearth bed 4 Bed support stand 5 Final bed 7 Displacement point of height level 8 Apex as displacement point of height level 9 Tangent line at end of exit side of final bed conveying surface 10 Sheet glass 20 Cooling device 21 Cooling Air duct pipe for device 22 Upper air blow quenching device 23 Lower air blow quenching device 24 Transport surface of cooling device (lower air blow) 25 Roll transport system of cooling device
Claims (4)
該装置は、加熱炉の末端部に設置される最終ベッドのみを交換することにより単一曲げガラス板と複合曲げガラス板とを同一のガスハース炉を使用して生産できる装置の最終ベッドを複合曲げガラス用のベッドに交換した装置であり、
該最終ベッドは、
板ガラスの搬送方向および搬送方向に直角であるベッドの幅方向の両方向に対して所定の曲率を有する上方に湾曲する凸状の搬送面を有するベッドであり、
かつ、該最終ベッドの板ガラスの搬送方向における高さレベルは、入口側端部よりも出口側端部の方が低い高さレベルのベッドであり、
かつ、該最終ベッドの入口側端部と出口側端部の中間部に形成された凸状頂点からなる変位点が入口側端部の高さレベルよりも高いレベルに設置され、該変位点から出口側端部にかけては搬送面が漸次高さレベルを低減していく上方に湾曲した形状を有するベッドであり、
かつ、該最終ベッドの底面が加熱炉のベッド支持台の上に、板ガラスの搬送方向に少なくとも上向きに傾けられることなく、即ち、搬送方向に沿って載置されているか、または搬送方向に対して下向きに傾けて載置されていることを特徴とする板ガラスの複合曲げ装置。On the hearth bed continuously arranged in the heating furnace, the plate glass is levitated by ejecting high-temperature gas from a gas jetting hole drilled in the surface of the hearth bed, and from the inlet side to the outlet side of the heating furnace In the apparatus for bending the glass sheet into a shape that follows the shape of the hearth bed surface by its own weight while being heated while being conveyed,
This equipment is a composite bending of the final bed of the equipment that can produce a single bent glass plate and a composite bent glass plate using the same gas hearth furnace by exchanging only the final bed installed at the end of the heating furnace. It is a device replaced with a glass bed ,
The final bed is
A bed having a convex conveying surface that curves upward and has a predetermined curvature with respect to both the conveying direction of the plate glass and the width direction of the bed that is perpendicular to the conveying direction,
And the height level in the conveyance direction of the plate glass of the final bed is a bed having a height level lower at the exit side end than at the entrance side end,
And the displacement point which consists of a convex vertex formed in the intermediate part of the entrance side end part and the exit side end part of the final bed is installed at a level higher than the height level of the entrance side end part. A bed having an upward curved shape in which the conveying surface gradually reduces the height level over the outlet side end,
And, the bottom surface of the final bed is placed on the bed support of the heating furnace at least upwardly in the sheet glass conveying direction, that is, placed along the conveying direction or with respect to the conveying direction. combined bending apparatus of the glass sheet, wherein the Ru Tei is placed to be inclined downward.
板ガラスの搬送方向および搬送方向に直角である幅方向の両方向に対して所定の曲率を有する上方に湾曲した搬送面を有し、
かつ、最終ベッドの出口側端部において、該最終ベッドの側面側から見て、漸次高さレベルを低減していく上方に湾曲した搬送面に沿って延長する方向に、即ち接線方向に、または該接線方向に対して上向きに、または該接線方向に対して下向きの傾斜状態に、
最終ベッドの出口側端部に接続角度（α）を持たせて接続されていることを特徴とする請求項１に記載される板ガラスの複合曲げ装置。A cooling device that cools the glass sheet
A conveying surface curved upward and having a predetermined curvature with respect to both the conveying direction of the plate glass and the width direction perpendicular to the conveying direction;
And at the end of the final bed on the outlet side, as viewed from the side of the final bed, in a direction extending along the upwardly curved conveying surface that gradually reduces the height level, ie, tangentially, or In an inclined state upward with respect to the tangential direction or downward with respect to the tangential direction,
The composite bending apparatus for plate glass according to claim 1, wherein the end of the final bed is connected with a connection angle (α).
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| JP2008106437A Division JP4780135B2 (en) | 2001-11-30 | 2008-04-16 | Sheet glass composite bending apparatus and method for forming composite bent glass sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8081312B2 (en) | 1997-05-05 | 2011-12-20 | Chemometec A/S | Method and a system for determination of particles in a liquid sample |
| US8125643B2 (en) | 1997-05-05 | 2012-02-28 | Chemometec A/S | Method and a system for determination of particles in a liquid sample |
| US8363221B2 (en) | 1997-05-05 | 2013-01-29 | Chemometec A/S | Method and a system for determination of particles in a liquid sample |
| US8432550B2 (en) | 1997-05-05 | 2013-04-30 | Chemometec A/S | Method and a system for determination of particles in a liquid sample |
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