JP3776605B2

JP3776605B2 - Strip bending machine

Info

Publication number: JP3776605B2
Application number: JP30190498A
Authority: JP
Inventors: 篤湯下; 市朗竹野; 隆之河野; 好章井上; 寛岩渕; 和昭太田
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 1998-10-23
Filing date: 1998-10-23
Publication date: 2006-05-17
Anticipated expiration: 2018-10-23
Also published as: JP2000126822A

Description

【０００１】
【発明の属する技術分野】
本発明は条材の曲げ加工装置に関し、特に船殻外板に溶接してこれを補強する骨材となるＴロンジ条材等を高周波誘導加熱により曲げ加工する場合に適用して有用なものである。
【０００２】
【従来の技術】
船殻の外板は、推進抵抗を低減して水中を効率良く航行するために、複雑な非可展曲面形状をもつ厚さ１０〜３０ｍｍ程度の鋼板で構成されている。この曲がり外板を加工するには、一般に線状加熱といわれる加工法が古くから知られている。これは、ガスバーナ等を用いて鋼板の表面を局部的に加熱し、その際に生成される塑性歪による鋼板の面外角変形や面内収縮変形を巧みに利用してその組合わせにより目標とする形状を得る方法であり、多くの造船所で使用されている。
【０００３】
また、かかる船殻外板にはその補強を行うべく所定の間隔で骨材を溶接している。この骨材には通常Ｔ型鋼及びＬ型鋼等の条材が用いられるが、この条材も船殻外板の溶接部分に沿う曲線形状に曲げてやる必要がある。従来技術においては、この種の条材も船殻外板と同様に、ガスバーナ等を用いて条材の表面を局部的に加熱し、その際に生成される塑性歪を利用して所定形状への曲げ加工を行っている。すなわち、フレームベンダーで冷間の一次曲げ加工を行った、例えば図１０に示すようなＴ型鋼の条材であるＴロンジ条材０１の所定位置を加熱し、当該Ｔロンジ条材０１のウエブ０１ａ（図１０中の垂直面）に付した逆正接線である目通し線０２が直線になるように曲げ加工を行うことにより、Ｔロンジ材０１のフェース０１ｂの表面（図１０中の下端面）を形成する曲線がこれを溶接する外板のフレームライン（当該外板の骨材を取り付ける位置において、この骨材を沿わせるライン；以下同じ。）の形状に一致するように成形している。このときの加熱位置及び加熱時間等の加熱条件は作業者の勘に全面的に負うている。
【０００４】
【発明が解決しようとする課題】
上述の如く従来技術においては、作業者の永年の経験による勘で加熱点、その他の加熱条件を決定していた。かかる作業に伴う加熱点、その他の加熱条件を適切に決定する能力を備えるには約５年以上の経験が必要とされており、熟練技術者の高齢化及び不足という問題を招来している。また、当該曲げ加工作業自体が重筋作業であることに加えて全ての作業を作業者の手作業によっているので、作業効率も悪く、作業に多大の時間を要するという問題もある。
【０００５】
本発明は、上記従来技術に鑑み、船殻外板に溶接する骨材（フレーム）等の条材を自動的に任意形状に曲げ加工し得る条材の曲げ加工装置を提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記目的を達成する本発明の構成は次の点を特徴とする。
【０００７】
１）垂直面内に配設された外枠の内側に球面軸受を介して３次元方向に回動可能に支承された内枠と、
条材の移送方向の特定の位置においてその周面を加熱する高周波加熱コイル等の加熱源と、
条材の移送方向における加熱源の上流側でこの条材を当該曲げ加工装置にクランプする送り側クランプ機構と、
内枠の内側に配設され、その内部を貫通する被加工部材である条材をこの条材の移送方向において前記加熱源よりも下流側でクランプすることによりこの条材を内枠に対して固定する曲げ側クランプ機構と、
前記球面軸受の中心を中心とし、内枠を外枠に対して垂直軸回り及び前記条材の移送方向と直角な水平軸回りに回動する駆動手段とを有すること。
【０００８】
本発明によれば、条材を加熱源で加熱するとともに曲げ側クランプ機構で内枠にクランプした状態で、駆動手段により内枠を外枠に対して垂直軸回り及び前記条材の移送方向と直角な水平軸回りに回動することにより、クランプ点が内枠の回動に伴う曲げ加工の力点となり、加熱源による加熱点が屈曲点となる。この結果、条材を垂直軸回り及び前記条材の移送方向と直角な水平軸回りに曲げ加工することができる。この際、条材の曲げ側はクランプされているので、当該曲げ加工における条材の中立点は球面軸受の中心位置で規定される。
【０００９】
２）垂直面内に配設された外枠の内側に球面軸受を介して３次元方向に回動可能に支承された内枠と、
条材の移送方向の特定の位置においてその周面を加熱する高周波加熱コイル等の加熱源と、
条材の移送方向における加熱源の上流側でこの条材を当該曲げ加工装置にクランプする送り側クランプ機構と、
内枠の内側に配設され、その内部を貫通する被加工部材である条材をこの条材の移送方向において前記加熱源よりも下流側でクランプすることによりこの条材を内枠に対して固定する曲げ側クランプ機構と、
前記球面軸受の中心を中心とし、内枠を外枠に対して三次元方向に回動する駆動手段とを有すること。
【００１０】
本発明によれば、上記１）の発明の場合に加えて条材の送り方向と同一の水平軸回り、すなわち条材の捩り方向にもこの条材を曲げ加工することができる。この際、条材の曲げ側はクランプされているので、当該曲げ加工における条材の中立点は球面軸受の中心位置で規定される。
【００１１】
３）上記１）又は２）に記載する条材の曲げ加工装置において、
球面軸受の中心位置と条材の位置との相対位置関係を変更することができるように、外枠は内枠と一体となって条材の移送方向と直角な方向に移動可能に形成したこと。
【００１２】
本発明によれば、球面軸受の中心位置と条材の位置との相対位置関係を変更することができるので、球面軸受の中心位置で与えられる当該曲げ加工における条材の中立点の位置を任意に調節することができる。
【００１３】
４）上記１）又は２）に記載する条材の曲げ加工装置において、
球面軸受の中心位置と条材の位置との相対位置関係を変更することができるように、外枠は内枠と一体となって条材の移送方向と直角な方向に移動可能に形成するとともに、クランプ機構は条材の移送方向と直角な方向に移動可能に内枠に取り付けたこと。
【００１４】
本発明によれば、クランプ機構で条材を内枠にクランプした状態で外枠を移動させればクランプ機構に対して内枠及び外枠が一体となって移動するので、球面軸受の中心位置と条材の位置との相対位置関係を変更することができ、この結果球面軸受の中心位置で与えられる当該曲げ加工における条材の中立点の位置を任意に調節することができる。
【００１５】
５）上記１）乃至４）に記載する何れか一つの条材の曲げ加工装置において、
曲げ側クランプ機構はＬ字状の曲げ側押え金具を有し、この曲げ側押え金具を駆動手段の駆動により条材に対して接離するように形成するとともに、曲げ側押え金具のＬ字の２辺をそれぞれ条材の面に当接させてこの条材を内枠にクランプするように形成したこと。
【００１６】
本発明によれば、曲げ側押え金具のＬ字の２辺が条材の面にそれぞれ当接してこの条材を内枠にクランプする。
【００１７】
６）上記１）乃至４）に記載する何れか一つの条材の曲げ加工装置において、
曲げ側クランプ機構はＬ字状の曲げ側押え金具を有し、この曲げ側押え金具を駆動手段の駆動により条材に対して接離するように形成するとともに、曲げ側押え金具のＬ字の２辺をそれぞれ条材の面に当接させてこの条材を内枠にクランプするように形成する一方、条材のリリース時には駆動手段の駆動により条材から離れた曲げ側押え金具のＬ字の両端面が内枠の内周面に当接してこの曲げ側押え金具の位置が規制されるように形成したこと。
【００１８】
本発明によれば、上記５）の発明の場合に加えて、条材のリリース時には駆動手段の駆動により条材から離れた曲げ側押え金具のＬ字の両端面が内枠の内周面に当接するので、この曲げ側押え金具の位置が固定される。
【００１９】
７）垂直面内に配設された外枠の内側に球面軸受を介して３次元方向に回動可能に支承された内枠と、
条材の移送方向の特定の位置においてその周面を加熱する高周波加熱コイル等の加熱源と、
条材の移送方向における加熱源の上流側でこの条材を当該曲げ加工装置にクランプする送り側クランプ機構と、
内枠の内側に配設され、その内部を貫通する被加工部材である条材をこの条材の移送方向において前記加熱源よりも下流側で摺動可能に支持することによりこの条材を内枠に対し移動可能に支持する曲げ側支持機構と、
前記球面軸受の中心を中心とし、内枠を外枠に対して垂直軸回り及び前記条材の移送方向と直角な水平軸回りに回動する駆動手段とを有すること。
【００２０】
本発明によれば、条材を加熱源で加熱するとともに曲げ側支持機構で内枠に移動可能に支持した状態で、駆動手段により内枠を外枠に対して垂直軸回り及び前記条材の移送方向と直角な水平軸回りに回動することにより、支持点が内枠の回動に伴う曲げ加工の力点となり、加熱源による加熱点が屈曲点となる。この結果、条材を垂直軸回り及び前記条材の移送方向と直角な水平軸回りに曲げ加工することができる。このとき、条材は内枠に対して移動可能となっているので、すなわち条材の曲げ側は拘束されていないので、条材と球面軸受の中心との相対的な位置関係に拘束されることなく曲げ加工が行われる。
【００２１】
８）垂直面内に配設された外枠の内側に球面軸受を介して３次元方向に回動可能に支承された内枠と、
条材の移送方向の特定の位置においてその周面を加熱する高周波加熱コイル等の加熱源と、
条材の移送方向における加熱源の上流側でこの条材を当該曲げ加工装置にクランプする送り側クランプ機構と、
内枠の内側に配設され、その内部を貫通する被加工部材である条材をこの条材の移送方向において前記加熱源よりも下流側で摺動可能に支持することによりこの条材を内枠に対し移動可能に支持する曲げ側支持機構と、
前記球面軸受の中心を中心とし、内枠を外枠に対して三次元方向に回動する駆動手段とを有すること。
【００２２】
本発明によれば、上記７）の発明の場合に加えて条材の送り方向と同一の水平軸回り、すなわち条材の捩り方向にもこの条材を曲げ加工することができる。このとき、条材は内枠に対して移動可能となっているので、すなわち条材の曲げ側は拘束されていないので、条材と球面軸受の中心との相対的な位置関係に拘束されることなく曲げ加工が行われる。
【００２３】
９）上記７）又は８）に記載する条材の曲げ加工装置において、
曲げ側支持機構はＬ字状の曲げ側支持金具を有し、この曲げ側支持金具を駆動手段の駆動により条材に対して接離するように形成するとともに、曲げ側支持金具のＬ字の２辺に回動可能にそれぞれローラを設け、各ローラがそれぞれ条材の面に当接してこの条材を内枠に対し移動可能に支持するように形成したこと。
【００２４】
本発明によれば、曲げ側支持金具のＬ字の２辺にそれぞれ配設されたローラが条材の面にそれぞれ当接してこの条材を内枠に移動可能に支持させる。
【００２５】
１０）上記７）又は８）に記載する何れか一つの条材の曲げ加工装置において、
曲げ側支持機構はＬ字状の曲げ側支持金具を有し、この曲げ側支持金具を駆動手段の駆動により条材に対して接離するように形成するとともに、曲げ側支持金具のＬ字の２辺にそれぞれ回動可能にローラを設け、各ローラがそれぞれ条材の面に当接してこの条材を内枠に対し移動可能に支持するように形成する一方、条材のリリース時には駆動手段の駆動により条材から離れた曲げ側支持金具のＬ字の両端面が内枠の内周面に当接してこの曲げ側支持金具の位置が規制されるように形成したこと。
【００２６】
本発明によれば、上記９）の発明の場合に加えて、条材のリリース時には駆動手段の駆動により条材から離れた曲げ側押え金具のＬ字の両端面が内枠の内周面に当接するので、この曲げ側押え金具の位置が固定される。
【００２７】
１１）上記１）乃至１０）に記載する何れか一つの条材の曲げ加工装置において、
加熱源は、球面軸受の中心の近傍部分で条材を誘導加熱するように配設された高周波加熱コイルで形成したこと。
【００２８】
本発明によれば、高周波加熱コイルによる加熱点と球面軸受の中心とを一致させた状態で、所定の曲げ加工を行うことができる。
【００２９】
【発明の実施の形態】
以下本発明の実施の形態を図面に基づき詳細に説明する。
【００３０】
図１は本実施の形態に係る条材の曲げ加工装置を示す平面図、図２は図１の前部を一部切欠き、拡大して示す拡大側面図、図３は図２のＩ−Ｉ線断面図、図４は図２のＩＩ−ＩＩ線断面図である。これらの図に示すように、本形態に係る被加工部材はＴロンジ条材（以下、単に条材と略称する。）０１であり、「Ｘ軸」とはこの条材０１の移送方向と平行な水平軸、「Ｙ軸」とはＸ軸が含まれる水平面内においてＸ軸と直角な水平軸、「Ｚ軸」とはＸ軸及びＹ軸に直角な軸とする。
【００３１】
図１〜図４に示すように、共通台座１は工場等の床面に配設される固定部であり、複数の条材載置ローラ２、送り架台３及び外枠４が条材０１の移送方向（Ｘ軸方向に沿う図１中の右側から左方向）に沿い順次配設してある。条材０１は条材置きローラ２の転動により移送され、送り架台３及び外枠４の内部に配設された高周波加熱コイル５を貫通してこの高周波加熱コイル５で誘導加熱される。すなわち、本形態は加熱源を高周波加熱コイル５で形成した場合である。ここで、高周波加熱コイル５は、条材０１を貫通させる構成のみならず、条材０１の加熱部位に近接させて条材０１に沿わせるような構成を採用しても良い。送り架台３は送りローラ６，送り側押え金具７及び送り側クランプ架台８をその内部に有している。送りローラ６は一対のローラ６ａ、６ｂの間に条材０１のウエブ０１ａを挾持し、その回転により条材０１を移送する。送り側押え金具７は送り側クランプシリンダ（図示せず）のピトンロンドの先端に取り付けられており、この送り側クランプシリンダの駆動により、送り架台３に固定してある送り側クランプ架台８との間で条材０１を挾持してクランプする。
【００３２】
外枠４は等長の４辺を組み合わせた矩形の枠体であり、各辺の中央部には当該外枠４の中心を中心Ａとする円弧の一部となっている球軸断片９ａ、９ｂ、９ｃ、９ｄが固着してある。内枠１０は等長の６辺を組み合わせた枠体であり、外枠４の各辺と対向する各辺に球面軸受断片１１ａ、１１ｂ、１１ｃ、１１ｄが固着してあり、これら球面軸受断片１１ａ〜１１ｄ及び球軸断片９ａ〜９ｄを介して外枠４に支承してある。すなわち内枠１０は、球軸断片９ａ〜９ｄ及び球面軸受断片１１ａ〜１１ｄからなり中心Ａを中心とする球面軸受を介して外枠４に支承されており、この結果内枠１０は中心Ａを回動中心として三次元空間の何れの方向にも回動し得るように構成してある。このときの内枠１０の回動はθ₁条材曲げシリンダ１２ａ、１２ｂ、θ₂条材曲げシリンダ１３ａ，１３ｂ及びθ₃条材曲げシリンダ１４ａ，１４ｂの駆動により行う。
【００３３】
θ₁条材曲げシリンダ１２ａ、１２ｂは内枠１０をθ₁方向（ＸＹ平面内でのＺ軸回りの回動方向）に回動させ、θ₂条材曲げシリンダ１３ａ，１３ｂは内枠１０をθ₂方向（ＸＺ平面内でのＹ軸回りの回動方向）に回動させ、θ₃条材曲げシリンダ１４ａ，１４ｂは内枠１０をθ₃方向（ＹＺ平面内でのＸ軸回りの回動方向）に回動させるものである。さらに詳言すると、θ₁条材曲げシリンダ１２ａ、１２ｂは、Ｘ軸方向に沿い水平方向に突出して外枠４に固着してある取付台座１５ａ、１５ｂに球面軸受１６ａ、１６ｂを介してそのシリンダ部の端部が回動可能に取り付けられている。同様に、θ₂条材曲げシリンダ１３ａ，１３ｂは、Ｘ軸方向に沿い水平方向に突出して外枠４に固着してある取付台座１７ａ、１７ｂに球面軸受１８ａ、１８ｂを介してそのシリンダ部の端部が回動可能に取り付けられており、θ₃条材曲げシリンダ１４ａ，１４ｂは、Ｙ軸方向に沿い水平方向に突出するよう外枠４に一体的に形成した取付台座１９ａ、１９ｂに球面軸受２０ａ、２０ｂを介してそのシリンダ部の端部が回動可能に取り付けられている。一方、球面軸受用支柱２１ａ、２１ｂ、２１ｃ、２１ｄは内枠１０及び球面軸受断片１１ａ〜１１ｄを一体的に固着するとともに球軸断片９ａ〜９ｄ及び外枠４を貫通してそれぞれの先端が外枠４の外側に臨んでいる。θ₁条材曲げシリンダ１２ａ、１２ｂ及びθ₃条材曲げシリンダ１４ａ、１４ｂのピストンロッドはその先端部が球面軸受（２２ａ，２４ａ）、（２２ｂ，２４ｂ）を介して球面軸受用支柱２１ｂ、２１ｄの先端部にそれぞれ連結され、θ₂条材曲げシリンダ１３ａ，１３ｂのピストンロッドはその先端部が球面軸受２３ａ、２３ｂを介して球面軸受用支柱２１ａ、２１ｃの先端部にそれぞれ連結されている。
【００３４】
内枠１０の内部には条材０１のクランプ機構が形成されている。本実施の形態ではＴロンジ条材を被加工部材としているので、このＴロンジ条材を良好にクランプし得るような曲げ側クランプ機構を構成している。すなわち、曲げ側クランプシリンダ２５の駆動により条材０１に対して接離する曲げ側押え金具２６をＬ字状に形成しており、このＬ字の各辺が条材０１のウエブ０１ａの片面とフェース０１ｂの裏面とに当接するとともに、Ｌ字の頂部がウエブ０１ａとフェース０１ｂとの交点に当接して曲げ側クランプ架台２７との間で条材０１を挾持し、これをクランプするようになっている。曲げ側クランプ架台２７は、曲げ側押え金具２６のための空間を確保すべくＬ字状の開口部である窓を有して内枠１０に固着してある。また、この曲げ側クランプ架台２７には前記窓に臨んで直方体のブロックである曲げ側クランプ受け金具２８ａ、２８ｂを配設してある。曲げ側クランプ受け金具２８ａは条材０１のウエブ０１ａの片面に当接してそのＺ軸方向の位置を規制するとともに、曲げ側クランプ受け金具２８ｂは条材０１のフェース０１ｂの表面に当接してそのＹ軸方向の位置を規制する。すなわち、条材０１は曲げ側クランプ受け金具２８ａに載置した状態で曲げ側クランプ受け金具２８ｂでそのフェース０１ｂの位置を規制するようになっている。
【００３５】
ここで、内枠１０の一辺の内周面には、当該辺に沿う直線上に並んで複数（本実施の形態では４個）の孔２９ａ、２９ｂ、２９ｃ、２９ｄを設けたブラケット２９が固着してあり、これらの孔２９ａ〜孔２９ｄの内の何れか１個（図４では孔２９ａ）に曲げ側クランプシリンダ２５のシリンダ部の端部が回動可能に取り付けられている。この曲げ側クランプシリンダ２５のピストンロッドの先端部には曲げ側押え金具２６の中心部が回動可能に取り付けられている。このように曲げ側クランプシリンダ２５及び曲げ側押え金具２６を取り付けることにより、当該加熱曲げ加工作業の初期及び途中での曲げ側における条材０１のクランプ直前の状態において、条材０１が所定位置から若干ずれた位置に配設されていても条材０１の位置を所定位置に補正してクランプすることができる。すなわち、当該加熱曲げ加工作業に伴う条材０１のクランプ時において、曲げ側クランプシリンダ２５の駆動に伴うピストンロッドの伸長により、先ず曲げ側押え金具２６の水平面が条材０１のウエブ０１ａに当接する。この状態でさらにピストンロッドを伸長すると、曲げ側押え金具２６の垂直面が条材０１のフェース０１ｂに当接して条材０１を曲げ側クランプ受け金具２８ｂ側に移動し、この曲げ側クランプ受け金具２８ｂに当接させる。かくして、条材０１の位置補正とクランプとを同時に行うことができる。
【００３６】
図４は曲げ側押え金具２６で条材０１をクランプしている状態を示しているが、曲げ側押え金具２６によるクランプをリリースしたときには図５に示すような状態になる。すなわち、当該曲げ側押え金具２６によるクランプをリリースしたときには曲げ側押え金具２６の両端面２６ａ、２６ｂが内枠１０の内周面に当接するように構成してある。このように構成することにより曲げ側押え金具２６によるクランプをリリースしたときであっても曲げ側クランプシリンダ２５及び曲げ側押え金具２６の位置を固定することができる。ちなみに、このようにして曲げ側クランプシリンダ２５及び曲げ側押え金具２６を固定しない場合には曲げ側クランプシリンダ２５がそのシリンダ部のブラケット２９に対する取付け点を中心として揺動するとともに、曲げ側押え金具２６がその曲げ側クランプシリンダ２５のピストンロッドに対する取付け点を中心として揺動することになる。上述の如く曲げ側押え金具２６によるクランプをリリースしたときに曲げ側クランプシリンダ２５及び曲げ側押え金具２６の位置を固定するための構造は、曲げ側クランプシリンダ２５のピストンロッドの伸縮ストロークと曲げ側押え金具２６のＬ字状の各辺の長さとの関係を調節することにより容易に実現し得る。
【００３７】
本発明に係る条材の曲げ加工装置においては、曲げ加工における中立点を調節することも当該曲げ加工を良好に行う上で肝要である。ここで「中立点」とは、曲げ加工の際の被加工部材に対して引張り応力が作用する部分から圧縮応力が作用する部分への移行点であり、このときの応力が零になる点をいう。曲げ加工に伴い圧縮応力がある程度以上に大きくなるとその部分で座屈を起こすので、このような状態にならないように中立点の調節を行う必要がある。
【００３８】
図５に示すように、例えばＴロンジ条材である条材０１をＸＹ平面内でＺ軸回りに回動して曲げる場合を考える。この場合、図中右方向に曲げ力を作用させると条材０１のフェース０１ｂ側に引張り応力が、またウエブ０１ａ側に圧縮応力が作用し、この圧縮応力はウエブ０１ａの端部で最も大きくなるので、この端部で座屈を起こさないように中立点Ａ’を調節する必要がある。この場合の中立点Ａ’は当該曲げ加工装置の曲げ中心（球面軸受の中心Ａ）として与えられるので、曲げ側押え金具２６による条材０１のクランプ位置において中心Ａと一致する条材０１の点が中立点となる。したがって、当該曲げ加工装置による被加工部材の曲げ加工を良好に行うには、被加熱部材の形状に応じて中立点を適切に設定すべく中心Ａと被加熱部材との相対的な位置関係を調節ことが肝要になる。かかる中立点Ａ’の調節を適切に行い得るように本実施の形態では次のような構成としている。
【００３９】
外枠４は、共通台座１に対するＹ軸方向（条材０１の移送方向と直角方向）の位置を調節することができるように構成してある。具体的には、雌ネジ部を有して共通台座１に固着されたナット部３０ａ、３０ｂとこれらに螺合する雄ネジ部を有する中立点調節ネジ３１ａ、３１ｂとを有しており、中立点調節ネジ３１ａ、３１ｂを回転することによりその先端が外枠４の側面に当接してこれをＹ軸方向に沿い移動するにようになっている。このとき内枠１０、曲げ側クランプシリンダ２５、曲げ側押え金具２６、曲げ側クランプ架台２７及び曲げ側クランプ受け金具２８ａ、２８ｂは外枠４と一体的に移動する。かくして、中立点調節ネジ３１ａ、３１ｂの先端部のナット部３０ａ、３０ｂからの突出量を調節することにより中心Ａ点の条材０１に対する相対位置を任意に調節することができる。ちなみに、この場合、共通台座１及び条材置きローラ２等で構成する条材０１の搬送路は固定部となっている。
【００４０】
図６及び図７は、上述の如き中立点調節ネジ３１ａ、３１ｂにより外枠４を移動して図４及び図５の中立点Ａ’を中立点Ａ’’に変更した場合における図４及び図５に対応する図であり、図６は曲げ側押え金具２６による条材０１のクランプ時、図７は曲げ側押え金具２６による条材０１のリリース時である。両図に示すように、球軸断片９ａ〜９ｄ及び球面軸受断片１１ａ〜１１ｄで構成する球面軸受の中心Ａの位置で中立点Ａ’’が決定される。すなわち、中立点Ａ’’は中立点Ａ’に対してＹ軸方向に沿い図中左方向に移動している。このため条材０１のフェース０１ｂの表面に当接してこの表面位置のＹ軸上の位置を規制する曲げ側クランプ受け金具２８ｂは、規制すべき条材０１のフェース０１ｂの表面の位置と曲げ側クランプ架台２７の距離とを考慮して適切なものに代える必要がある。そこで、曲げ側クランプ架台２７には、曲げ側クランプ受け金具２８ａ、２８ｂに代えて曲げ側クランプ受け金具３２ａ、３２ｂが固定してある（曲げ側クランプ金具２８ａは必ずしも代える必要はない。）。また、この場合には曲げ側クランプシリンダ２５のブラケット２９に対する取付け位置も変更する必要がある。曲げ側押え金具２６を条材０１のウェブ０１ａ及びフェース０１ｂに当接させながらこの曲げ側押え金具２６で条材０１をクランプするには、曲げ側クランプシリンダ２５のブラケット２９に対する取付け位置と曲げ側押え金具２６のＬ字の頂点とを結ぶ直線と、同曲げ側クランプシリンダ２５のブラケット２９に対する取付け位置とクランプすべき所定位置における条材０１のウエブ０１ａ及びフェース０１ｂの交点とを結ぶ直線とを可及的に一致させる必要があるからである。このため、図６及び図７に示す場合、曲げ側クランプシリンダ２５はブラケット２９の孔２９ｂを利用してこのブラケット２９に取り付けている。
【００４１】
高周波加熱コイル５は条材０１を一定の間隙を介して囲繞する形状に成形して基本的には中心Ａを含む垂直面内に配設してある。さらに詳言すると、送り架台３上には、高周波加熱コイル５に高周波電流を効率良く供給するための整合トランス３３が図２のＸ軸方向に直線的に移動し得るように配設してある。高周波加熱コイル５は、整合トランス３３に接続してあり整合トランス３３と一体的にＸ軸方向に移動するように構成してある。かくして高周波加熱コイル５は、基本的には中心Ａがこのときの曲げ応力の作用点となるように、この中心を含む垂直面内の所定位置で条材０１を誘導加熱するが、この条材０１をＸ軸回りに捩じる場合には、他のＹ軸回り及びＺ軸回りに回動して曲げ加工を行う場合に較べ、より大きな曲げ応力が必要になる。そこで、捩り曲げ加工を行う場合には、他の場合に較べより広い領域を高周波加熱コイル５で加熱してやる必要がある。このような広領域の加熱は高周波加熱コイル５の幅を広くすることによっても対応し得るが、この場合には捩り曲げ加工を行うためだけに高周波加熱コイル５を幅広に構成することとなり、他の２種類の曲げ加工を行う場合には高周波加熱コイル５の不必要な大形化を招来することとなる。かかる問題を回避するため、本形態では高周波コイル５をＸ軸方向に沿い図２中右方向（条材０１の移送方向と反対方向）に移動して実効的な加熱領域の拡大を図っている。このことにより、高周波加熱コイル５はＹ軸及びＺ軸回りの曲げ加工のための加熱幅を有していれば良いことになる。
【００４２】
上述の如き曲げ加工装置による条材０１の曲げ加工は次のような態様で行う。先ず、中立点Ａ’（Ａ’’）の調節を行う。すなわち、予め定められた中立点に基づき外枠４のＹ軸方向の位置を調節する。その後条材０１を一定量移送しながら断続曲げを行う。すなわち、次のシーケンスで曲げ加工を行う。
▲１▼ 条材０１を一定量移送する。この移送は条材載置ローラ２及び送りローラ６を駆動することにより行う。
▲２▼ θ₂方向及びθ₃方向を固定してθ₁方向の曲げ加工を行う。具体的には、送り側押え金具７及び曲げ側押え金具２６で条材０１をクランプした状態で、高周波加熱コイル５により条材０１を加熱しながらθ₁条材曲げシリンダ１２ａ、１２ｂを駆動する。このときの駆動力は球面軸受２２ａ、２２ｂを介して球面軸受用支柱２１ｂ、２１ｄに伝達され、外枠４に球面軸受を介して回動可能に支承された内枠１０が外枠４に対して中心Ａを中心としてθ₁方向に回動する。この結果、曲げ側押え金具２６による条材０１のクランプ位置が力点となり、高周波加熱コイル５による加熱位置が屈曲点となって条材０１にＺ軸回の曲げ応力が作用し、条材０１のθ₁方向への曲げ加工が行われる。
▲３▼ θ₁方向を目標形状に曲げた後、θ₁方向及びθ₃方向を固定してθ₂方向の曲げ加工を行う。具体的には、▲２▼と同様の状態でθ₂条材曲げシリンダ１３ａ、１３ｂを駆動する。このときの駆動力は球面軸受２３ａ、２３ｂを介して球面軸受用支柱２１ａ、２１ｃに伝達される。この結果、外枠４に支承された内枠１０が中心Ａを中心としてθ₂方向に回動して条材０１のθ₂方向への曲げ加工が行われる。
▲４▼ θ₂方向を目標形状に曲げた後、θ₁方向及びθ₂方向を固定してθ₃方向の曲げ加工（捩り加工）を行う。具体的には、▲２▼と同様の状態でθ₃条材曲げシリンダ１４ａ、１４ｂを駆動する。このときの駆動力は球面軸受２４ａ、２４ｂを介して球面軸受用支柱２１ｂ、２１ｄに伝達され、外枠４に支承された内枠１０が中心Ａを中心としてθ₃方向に回動する。このとき、整合トランス３３と一体的に高周波加熱コイル５をＸ軸方向に沿い条材０１の移送方向と反対方向に移動して実効的な加熱幅を拡大する。この結果条材０１のθ₃方向への曲げ加工（捩り加工）が行われる。
▲５▼ 条材０１を一定量移送して▲２▼〜▲４▼の動作を繰り返し、所望の３次元形状に曲げ加工する。すなわち、当該曲げ加工はθ₁方向、θ₂方向及びθ₃方向への微小な曲げ加工を順次行う断続曲げとなる。
【００４３】
上述の如き曲げ加工において、条材０１の移送量は曲げ加工の曲率によって決定する。すなわち、曲率が小さい所では送りピッチを細かくする。このことにより曲げ加工精度の向上を図ることができる。一方、曲率が大きい所では送りピッチを粗くする。このことにより曲げ加工の加工能率の向上を図ることができる。また、条材０１を所定形状に曲げ加工するには条材０１の移送とともに、θ₁〜θ₃条材曲げシリンダ１２ａ、１２ｂ、１３ａ、１３ｂ、１４ａ、１４ｂの駆動制御が必要になるが、かかる制御は、例えば条材０１のＣＡＤデータを利用することにより良好に行うことができる。
【００４４】
なお、上記実施の形態では外枠４をＹ軸方向に移動することによって曲げ加工の際の曲げ中心Ａの位置で与えられる条材０１の中立点Ａ’（Ａ’’）の位置を調節するように構成したが、かかる中立点Ａ’（Ａ’’）の調節は中心Ａと条材０１等の被加工部材との相対的な位置関係を調節することにより実現できる。したがって、上記実施の形態のものに限定する必要はない。例えば、曲げ側押え金具２６等からなる当該被加工部材のクランプ機構をＹ軸方向に移動可能に内枠１０に取り付けるとともに、上記実施の形態と同様に外枠４が内枠１０と一体的にＹ軸方向に移動可能に形成されていれば良い。この場合には、クランプ機構で被加工部材をクランプするとともに、クランプ機構が内枠１０に対して移動可能な状態で外枠４をＹ軸方向に移動してそのＹ軸方向の位置を調節すれば良く、この調節が完了した後にクランプ機構を内枠１０に対してボルト等の締結部材で固定すれば良い。被加工部材はクランプ機構にクランプされて固定部である共通台座１等に対して固定されているため、外枠４のＹ軸方向の位置を調節して中心Ａで与えられる被加工部材の中立点を調節することができるからである。したがってこの場合には、上記実施の形態において中立点を変更する毎に必要とされる曲げ側クランプ受け金具２８ａ，２８ｂ、（３２ａ，３２ｂ）を取り代えるという作業の必要はなくなる。
【００４５】
上述の如き実施の形態に係る装置では、加熱源である高周波加熱コイル５の下流側においては、曲げ側クランプ機構を形成して曲げ側でも条材０１をクランプするようにしたが、必ずしもこのように構成する必要はない。曲げ側においては条材０１を内枠１０に対して移動可能に形成しても良い。
【００４６】
条材０１を内枠１０に対して移動可能に支持するように構成した本願発明の他の実施の形態を図８及び図９に基づき説明図する。図８は、図２に対応する本形態に係る装置の側面図、図９は、図４に対応する本形態に係る装置の断面図で、図８のＩＩＩ−ＩＩＩ線断面図である。両図中、図２及び図４と同一部分には同一番号を付し、重複する説明は省略する。
【００４７】
図８及び図９に示すように、高周波加熱コイル５の下流である曲げ側においては、条材０１は内枠１０に移動可能に支持するように形成してある。すなわち、曲げ側支持機構はＬ字状の曲げ側支持金具３４を有し、この曲げ側支持金具３４を駆動手段である曲げ側クランプシリンダ２５の駆動により条材０１に対して接離するように形成してある。曲げ側支持金具３４のＬ字の２辺には、水平軸３５ａ及び垂直軸３５ｂの回りに回動可能にそれぞれローラ３６ａ、３６ｂを設け、各ローラ３６ａ、３６ｂがそれぞれ条材０１のウエブ０１ａ及びフェース０１ｂの表面に当接するようになっている。一方、各ローラ３６ａ、３６ｂに対して条材０１のウエブ０１ａ及びフェース０１ｂを挟んだ反対側には、同様に水平軸３７ａ及び垂直軸３７ｂの回りにそれぞれ回動可能なローラ３８ａ、３８ｂが配設してある。すなわち、内枠１０に一体的に固着されたＬ字状の窓を有する曲げ側支持架台３９の縁部には前記窓の形状に沿うＬ字状の枠体４０が固着してあり、この枠体４０の２辺にそれぞれ前記ローラ３８ａ、３８ｂが支持されている。かくして、条材０１はローラ３６ａ、３７ａ及びローラ３６ｂ、３７ｂ間で摺動可能に支持され、内枠１０に対して移動可能となっている。
【００４８】
支持金具ガイド４１ａ、４１ｂは内枠１０の内側に突出してその内周面に固着してあり、Ｌ字状の曲げ側支持金具３４の両端部にそれぞれ当接してこの曲げ側支持金具３４の、条材０１の移送方向に関する下流側でその位置を規制するようになっている。このとき、上流側においても同様の支持金具ガイド（図示せず。）を設けて曲げ側支持金具３４の位置を規制するようにしても良い。本実施の形態では、前記実施の形態と異なり、曲げ側支持金具３４では条材０１を拘束しないので、この条材０１とローラ３６ａ、３６ｂ、３８ａ、３８ｂとの間の摩擦力により曲げ側支持金具３４が条材０１の移動方向に引っ張られて移動するのを規制するために設けたものである。
【００４９】
かかる本形態においては、前記実施の形態と同様の態様で条材０１の曲げ加工が行われるが、当該曲げ加工における曲げ側においては、条材０１をローラ３６ａ、３６ｂ、３８ａ、３８ｂを介して支持するようになっているので、当該条材０１は曲げ側では拘束されない。したがって、高周波加熱コイル５による加熱により条材０１が軸方向に伸びてもこの伸びを吸収することができるばかりでなく、条材０１と内枠１０との相対的な位置関係、換言すれば球面軸受の中心Ａとの相対的な位置関係の如何にかかわらず、条材０１が本来的に有する固有の中立点を中心に曲げられる。すなわち、最も小さい曲げモーメントで所望の曲げ加工を行うことができる。
【００５０】
なお、上述の両実施の形態では被加工部材をＴロンジ条材としたが、条材であれば特にその断面形状を限定する必要はない。アングル材、その他の特殊形状のものであっても、また船殻外板の骨材として適用するもの以外であっても勿論良い。
【００５１】
上述の実施の形態においては、加熱源を、高周波加熱コイル５で形成し、しかもこの高周波加熱コイル５は、中心Ａを含むとともに条材０１の移送方向に直角な平面内で、条材０１がその内部を貫通するように配設したが、必ずしもかかる構成に限定するものではない。例えば、既存の産業用ロボットのアームに高周波加熱コイル又はガスバーナ等の加熱手段を把持させ、この産業用ロボットのアームの位置制御により、これらの加熱手段で条材０１の所定位置を加熱するように構成しても良い。
【００５２】
【発明の効果】
以上実施の形態とともに詳細に説明した通り、〔請求項１〕に記載する発明は、垂直面内に配設された外枠の内側に球面軸受を介して３次元方向に回動可能に支承された内枠と、条材の移送方向の特定の位置においてその周面を加熱する高周波加熱コイル等の加熱源と、条材の移送方向における加熱源の上流側でこの条材を当該曲げ加工装置にクランプする送り側クランプ機構と、内枠の内側に配設され、その内部を貫通する被加工部材である条材をこの条材の移送方向において前記加熱源よりも下流側でクランプすることによりこの条材を内枠に対して固定する曲げ側クランプ機構と、前記球面軸受の中心を中心とし、内枠を外枠に対して垂直軸回り及び前記条材の移送方向と直角な水平軸回りに回動する駆動手段とを有する。
【００５３】
したがって、条材を加熱源で加熱するとともに曲げ側クランプ機構で内枠にクランプした状態で、駆動手段により内枠を外枠に対して垂直軸回り及び前記条材の移送方向と直角な水平軸回りに回動することにより、クランプ点が内枠の回動に伴う曲げ加工の力点となり、加熱源による加熱点が屈曲点となる。この結果、駆動手段の駆動による内枠の回動量に応じて条材を垂直軸回り及び前記条材の移送方向と直角な水平軸回りに自動的に曲げ加工することができる。しかも、このときの曲げ加工の加工量は駆動手段の駆動量の制御により行うことができるので、再現性も良好なものとなる。
【００５４】
また、この曲げ加工の際の条材の曲げ側はクランプされているので、当該曲げ加工における条材の中立点は球面軸受の中心位置で規定され、この中立点を中心に曲げ加工が行われる。この結果、精度の良い曲げ加工を行うことができる。
【００５５】
〔請求項２〕に記載する発明は、垂直面内に配設された外枠の内側に球面軸受を介して３次元方向に回動可能に支承された内枠と、条材の移送方向の特定の位置においてその周面を加熱する高周波加熱コイル等の加熱源と、条材の移送方向における加熱源の上流側でこの条材を当該曲げ加工装置にクランプする送り側クランプ機構と、内枠の内側に配設され、その内部を貫通する被加工部材である条材をこの条材の移送方向において前記加熱源よりも下流側でクランプすることによりこの条材を内枠に対して固定する曲げ側クランプ機構と、前記球面軸受の中心を中心とし、内枠を外枠に対して三次元方向に回動する駆動手段とを有する。
【００５６】
したがって、上記〔請求項１〕に記載する発明の場合に加えて条材の送り方向と同一の水平軸回り、すなわち条材の捩り方向にもこの条材を曲げ加工することができる。また、上記〔請求項１〕に記載する発明の場合と同様に、曲げ加工の際の条材の曲げ側はクランプされているので、当該曲げ加工における条材の中立点は球面軸受の中心位置で規定され、この中立点を中心に曲げ加工が行われるので、精度の良い曲げ加工を行うことができる。
【００５７】
〔請求項３〕に記載する発明は、〔請求項１〕又は〔請求項２〕に記載する条材の曲げ加工装置において、球面軸受の中心位置と条材の位置との相対位置関係を変更することができるように、外枠は内枠と一体となって条材の移送方向と直角な方向に移動可能に形成した。
【００５８】
この結果、球面軸受の中心位置と条材の位置との相対位置関係を変更することができ、球面軸受の中心位置で与えられる当該曲げ加工における条材の中立点の位置を任意に調節することができるので、条材の形状及び曲げ曲率等の加工条件に応じた適切な中立点位置の調節を行うことができる。
【００５９】
〔請求項４〕に記載する発明は、〔請求項１〕又は〔請求項２〕に記載する条材の曲げ加工装置において、球面軸受の中心位置と条材の位置との相対位置関係を変更することができるように、外枠は内枠と一体となって条材の移送方向と直角な方向に移動可能に形成するとともに、クランプ機構は条材の移送方向と直角な方向に移動可能に内枠に取り付けた。
【００６０】
この結果、クランプ機構で条材を内枠にクランプした状態で外枠を移動させればクランプ機構に対して内枠及び外枠が一体となって移動することができ、球面軸受の中心位置と条材の位置との相対位置関係を変更することができるので、上記〔請求項３〕に記載する発明と同様の効果を奏する。
【００６１】
〔請求項５〕に記載する発明は、〔請求項１〕乃至〔請求項４〕に記載する何れか一つの条材の曲げ加工装置において、曲げ側クランプ機構はＬ字状の曲げ側押え金具を有し、この曲げ側押え金具を駆動手段の駆動により条材に対して接離するように形成するとともに、曲げ側押え金具のＬ字の２辺をそれぞれ条材の面に当接させてこの条材を内枠にクランプするように形成した。
【００６２】
この結果、曲げ側押え金具のＬ字の２辺が条材の面にそれぞれ当接してこの条材を内枠にクランプすることができる。このため、特にＴロンジ条材等、ウエブとフェースとが直角に交わる条材のクランプに最適なものとなる。また、一個の駆動手段で２箇所のクランプを同時に行うことができる。
【００６３】
〔請求項６〕に記載する発明は、〔請求項１〕乃至〔請求項４〕に記載する何れか一つの条材の曲げ加工装置において、曲げ側クランプ機構はＬ字状の曲げ側押え金具を有し、この曲げ側押え金具を駆動手段の駆動により条材に対して接離するように形成するとともに、曲げ側押え金具のＬ字の２辺をそれぞれ条材の面に当接させてこの条材を内枠にクランプするように形成する一方、条材のリリース時には駆動手段の駆動により条材から離れた曲げ側押え金具のＬ字の両端面が内枠の内周面に当接してこの曲げ側押え金具の位置が規制されるように形成した。
【００６４】
この結果、〔請求項５〕に記載する発明に加えて、条材のリリース時には駆動手段の駆動により条材から離れた曲げ側押え金具のＬ字の両端面が内枠の内周面に当接してこの曲げ側押え金具の位置が固定される。したがって、曲げ側押え金具及びこの駆動手段を内枠に一体的に固定しておくことができる。
【００６５】
〔請求項７〕に記載する発明は、垂直面内に配設された外枠の内側に球面軸受を介して３次元方向に回動可能に支承された内枠と、条材の移送方向の特定の位置においてその周面を加熱する高周波加熱コイル等の加熱源と、条材の移送方向における加熱源の上流側でこの条材を当該曲げ加工装置にクランプする送り側クランプ機構と、内枠の内側に配設され、その内部を貫通する被加工部材である条材をこの条材の移送方向において前記加熱源よりも下流側で摺動可能に支持することによりこの条材を内枠に対し移動可能に支持する曲げ側支持機構と、前記球面軸受の中心を中心とし、内枠を外枠に対して垂直軸回り及び前記条材の移送方向と直角な水平軸回りに回動する駆動手段とを有する。
【００６６】
したがって、条材を加熱源で加熱するとともに曲げ側支持機構で内枠に移動可能に支持した状態で、駆動手段により内枠を外枠に対して垂直軸回り及び前記条材の移送方向と直角な水平軸回りに回動することにより、支持点が内枠の回動に伴う曲げ加工の力点となり、加熱源による加熱点が屈曲点となる。この結果、〔請求項１〕に記載する発明と同様の作用・効果を奏する。さらに、曲げ側において条材は拘束されていないので、当該条材と内枠との相対的な位置関係、換言すれば球面軸受の中心との相対的な位置関係を調整することなく、最も小さい曲げモーメントで所望の曲げ加工を行うことができる。
【００６７】
〔請求項８〕に記載する発明は、垂直面内に配設された外枠の内側に球面軸受を介して３次元方向に回動可能に支承された内枠と、条材の移送方向の特定の位置においてその周面を加熱する高周波加熱コイル等の加熱源と、条材の移送方向における加熱源の上流側でこの条材を当該曲げ加工装置にクランプする送り側クランプ機構と、内枠の内側に配設され、その内部を貫通する被加工部材である条材をこの条材の移送方向において前記加熱源よりも下流側で摺動可能に支持することによりこの条材を内枠に対し移動可能に支持する曲げ側支持機構と、前記球面軸受の中心を中心とし、内枠を外枠に対して三次元方向に回動する駆動手段とを有する。
【００６８】
この結果、上記〔請求項７〕に記載する発明の場合に加えて条材の送り方向と同一の水平軸回り、すなわち条材の捩り方向にもこの条材を曲げ加工することができる。このとき、〔請求項７〕に記載する発明と同様に、曲げ側において条材は拘束されていないので、当該条材と球面軸受の中心との相対的な位置関係を調整することなく、最も小さい曲げモーメントで所望の曲げ加工を行うことができる。
【００６９】
〔請求項９〕に記載する発明は、〔請求項７〕又は〔請求項８〕に記載する条材の曲げ加工装置において、曲げ側支持機構はＬ字状の曲げ側支持金具を有し、この曲げ側支持金具を駆動手段の駆動により条材に対して接離するように形成するとともに、曲げ側支持金具のＬ字の２辺に回動可能にそれぞれローラを設け、各ローラがそれぞれ条材の面に当接してこの条材を内枠に対し移動可能に支持するように形成した。
【００７０】
この結果、曲げ側支持金具のＬ字の２辺にそれぞれ配設されたローラが条材の面にそれぞれ当接してこの条材を内枠に移動可能に支持させることができる。このため、特にＴロンジ条材等、ウエブとフェースとが直角に交わる条材の支持に最適なものとなる。また、一個の駆動手段で２箇所の支持が可能になる。
【００７１】
〔請求項１０〕に記載する発明は、〔請求項７〕又は〔請求項８〕に記載する何れか一つの条材の曲げ加工装置において、曲げ側支持機構はＬ字状の曲げ側支持金具を有し、この曲げ側支持金具を駆動手段の駆動により条材に対して接離するように形成するとともに、曲げ側支持金具のＬ字の２辺にそれぞれ回動可能にローラを設け、各ローラがそれぞれ条材の面に当接してこの条材を内枠に対し移動可能に支持するように形成する一方、条材のリリース時には駆動手段の駆動により条材から離れた曲げ側支持金具のＬ字の両端面が内枠の内周面に当接してこの曲げ側支持金具の位置が規制されるように形成した。
【００７２】
この結果、〔請求項９〕に記載する発明に加えて、条材のリリース時には駆動手段の駆動により条材から離れた曲げ側押え金具のＬ字の両端面が内枠の内周面に当接してこの曲げ側支持金具の位置が固定される。したがって、曲げ側支持金具及びこの駆動手段を内枠に一体的に固定しておくことができる。
【００７３】
〔請求項１１〕に記載する発明は、〔請求項１〕乃至〔請求項１０〕に記載する何れか一つの条材の曲げ加工装置において、加熱源は、球面軸受の中心の近傍部分で条材を誘導加熱するように配設された高周波加熱コイルで形成した。
【００７４】
この結果、高周波加熱コイルによる加熱点と球面軸受の中心とを一致させた状態で、精度良く所定の曲げ加工を行うことができる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る条材の曲げ加工装置を示す平面図。
【図２】図１の前部を一部切欠き拡大して示す拡大側面図。
【図３】図２のＩ−Ｉ線断面図。
【図４】図２のI Ｉ−ＩＩ線断面図（中立点Ａ’において条材０１をクランプした状態）。
【図５】図２のＩＩ−ＩＩ線断面図（中立点Ａ’において条材０１をリリースした状態）。
【図６】図２のＩＩ−ＩＩ線断面図（中立点Ａ’’において条材０１をクランプした状態）。
【図７】図２のＩＩ−ＩＩ線断面図（中立点Ａ’’において条材０１をクランプした状態）。
【図８】本発明の他の実施の形態における図２に対応する部分を示す側面図。
【図９】図８のＩＩＩ−ＩＩＩ線断面図。
【図１０】被加熱部材である条材（Ｔロンジ条材）を示す側面図。
【符号の説明】
Ａ中心
Ａ’，Ａ’’ 中立点
０１条材
４外枠
５高周波加熱コイル
７送り側押え金具
８送り側クランプ架台
９ａ，９ｂ，９ｃ，９ｄ球面断片
１０内枠
１１ａ，１１ｂ，１１ｃ，１１ｄ球面軸受断片
１２ａ，１２ｂ，１２ｃ，１２ｄ θ₁条材曲げシリンダ
１３ａ，１３ｂ，１３ｃ，１３ｄ θ₂条材曲げシリンダ
１４ａ，１４ｂ，１４ｃ，１４ｄ θ₃条材曲げシリンダ
２５曲げ側クランプシリンダ
２６曲げ側押え金具
２６ａ，２６ｂ端面
３０ａ，３０ｂナット部
３１ａ，３１ｂ中立点調節ネジ
３４曲げ側支持金具
３６ａ、３６ｂ、３８ａ、３８ｂローラ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a strip bending apparatus, and is particularly useful when applied to high-frequency induction heating for bending a T-longier strip or the like, which is an aggregate that is welded to a hull outer plate to reinforce it. is there.
[0002]
[Prior art]
The outer shell of the hull is composed of a steel plate with a thickness of about 10 to 30 mm having a complicated non-developable curved surface shape in order to reduce the propulsion resistance and efficiently navigate underwater. In order to process this bent outer plate, a processing method generally called linear heating has been known for a long time. This is done by locally heating the surface of the steel sheet using a gas burner, etc., and skillfully utilizing the out-of-plane angular deformation and in-plane shrinkage deformation of the steel sheet due to the plastic strain generated at that time. It is a way to get shape and is used in many shipyards.
[0003]
In addition, aggregate is welded to the hull outer plate at a predetermined interval in order to reinforce it. As this aggregate, strips such as T-shaped steel and L-shaped steel are usually used, but this strip also needs to be bent into a curved shape along the welded portion of the hull outer plate. In the prior art, similar to the hull shell, this type of strip is also locally heated on the surface of the strip using a gas burner, etc., and is made into a predetermined shape using the plastic strain generated at that time. Is bending. That is, a predetermined position of a T longi strip 01, which is a T-shaped steel strip as shown in FIG. 10, for example, which has been subjected to cold primary bending by a frame bender, is heated, and the web 01a of the T longi strip 01 is heated. The surface of the face 01b of the T-longi material 01 (the lower end surface in FIG. 10) is bent by bending so that the through-line 02 that is an arctangent line attached to (vertical surface in FIG. 10) is a straight line. The curve to be formed is formed so as to match the shape of the frame line of the outer plate to which it is welded (the line along which this aggregate is placed at the position where the aggregate of the outer plate is attached; the same applies hereinafter). The heating conditions such as the heating position and the heating time at this time depend entirely on the operator's intuition.
[0004]
[Problems to be solved by the invention]
As described above, in the prior art, the heating point and other heating conditions are determined based on intuition based on years of experience of the operator. In order to have the ability to appropriately determine the heating point and other heating conditions associated with such work, experience of about 5 years or more is required, resulting in the problem of aging and shortage of skilled engineers. Further, in addition to the bending work itself being a heavy-duty work, all work is performed manually by the operator, so that there is a problem that work efficiency is poor and work takes a lot of time.
[0005]
An object of the present invention is to provide a strip bending apparatus capable of automatically bending a strip such as an aggregate (frame) to be welded to a hull outer plate into an arbitrary shape in view of the above-described prior art. To do.
[0006]
[Means for Solving the Problems]
The configuration of the present invention that achieves the above object is characterized by the following points.
[0007]
1) An inner frame that is rotatably supported in a three-dimensional direction via a spherical bearing inside an outer frame disposed in a vertical plane;
A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position in the direction in which the strip is transferred;
A feed side clamping mechanism that clamps the strip to the bending apparatus on the upstream side of the heating source in the direction of transport of the strip;
The strip is disposed on the inner frame and clamped on the downstream side of the heating source with respect to the strip in the transfer direction of the strip. A bending side clamping mechanism to be fixed;
Drive means for rotating the inner frame around a vertical axis with respect to the outer frame and a horizontal axis perpendicular to the transfer direction of the strip material with the center of the spherical bearing as the center.
[0008]
According to the present invention, the strip is heated by the heating source and clamped to the inner frame by the bending side clamp mechanism, and the inner frame is rotated around the vertical axis with respect to the outer frame by the driving means and the direction of transport of the strip. By rotating around a right-angled horizontal axis, the clamp point becomes the point of bending for the rotation of the inner frame, and the heating point by the heating source becomes the bending point. As a result, the strip can be bent around a vertical axis and a horizontal axis perpendicular to the direction of transport of the strip. At this time, since the bending side of the strip is clamped, the neutral point of the strip in the bending process is defined by the center position of the spherical bearing.
[0009]
2) An inner frame that is rotatably supported in a three-dimensional direction via a spherical bearing inside an outer frame disposed in a vertical plane;
A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position in the direction in which the strip is transferred;
A feed side clamping mechanism that clamps the strip to the bending apparatus on the upstream side of the heating source in the direction of transport of the strip;
The strip is disposed on the inner frame and clamped on the downstream side of the heating source with respect to the strip in the transfer direction of the strip. A bending side clamping mechanism to be fixed;
Drive means for rotating the inner frame in a three-dimensional direction with respect to the outer frame with the center of the spherical bearing as the center.
[0010]
According to the present invention, in addition to the case of the above invention 1), this strip can be bent around the same horizontal axis as the feed direction of the strip, that is, in the twisting direction of the strip. At this time, since the bending side of the strip is clamped, the neutral point of the strip in the bending process is defined by the center position of the spherical bearing.
[0011]
3) In the bending apparatus for strip material described in 1) or 2) above,
The outer frame is integrated with the inner frame so that it can move in a direction perpendicular to the direction of the strip material so that the relative positional relationship between the center position of the spherical bearing and the position of the strip material can be changed. .
[0012]
According to the present invention, since the relative positional relationship between the center position of the spherical bearing and the position of the strip can be changed, the position of the neutral point of the strip in the bending process given by the center position of the spherical bearing can be arbitrarily set. Can be adjusted to.
[0013]
4) In the strip bending apparatus described in 1) or 2) above,
The outer frame is formed integrally with the inner frame so as to be movable in a direction perpendicular to the direction of transport of the strip so that the relative positional relationship between the center position of the spherical bearing and the position of the strip can be changed. The clamp mechanism is attached to the inner frame so that it can move in the direction perpendicular to the direction of the strip material transfer.
[0014]
According to the present invention, if the outer frame is moved in a state where the strip is clamped to the inner frame by the clamp mechanism, the inner frame and the outer frame move integrally with respect to the clamp mechanism. The relative positional relationship between the position of the strip material and the position of the strip material can be changed. As a result, the position of the neutral point of the strip material in the bending process given by the center position of the spherical bearing can be arbitrarily adjusted.
[0015]
5) In the bending apparatus for any one strip described in 1) to 4) above,
The bending-side clamp mechanism has an L-shaped bending-side presser fitting, and the bending-side presser fitting is formed so as to be in contact with and away from the strip material by driving of the driving means, and the bending-side presser fitting L-shaped The two sides were brought into contact with the surface of the strip, and the strip was clamped to the inner frame.
[0016]
According to the present invention, the two L-shaped sides of the bending side presser fitting are in contact with the surface of the strip material, and the strip material is clamped to the inner frame.
[0017]
6) In the bending apparatus for any one strip described in 1) to 4) above,
The bending-side clamp mechanism has an L-shaped bending-side presser fitting, and the bending-side presser fitting is formed so as to be in contact with and away from the strip material by driving of the driving means, and the bending-side presser fitting L-shaped The two sides are brought into contact with the surface of the strip, and the strip is clamped to the inner frame. When the strip is released, the L-shape of the bending-side presser bracket that is separated from the strip by driving the driving means The both end surfaces of the metal plate are in contact with the inner peripheral surface of the inner frame so that the position of the bending side presser fitting is regulated.
[0018]
According to the present invention, in addition to the case of the above-mentioned 5), when the strip material is released, both L-shaped end faces of the bending-side presser fitting separated from the strip material by driving of the driving means are on the inner peripheral surface of the inner frame. Since it contacts, the position of this bending side pressing metal fitting is fixed.
[0019]
7) An inner frame that is rotatably supported in a three-dimensional direction via a spherical bearing inside an outer frame disposed in a vertical plane;
A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position in the direction in which the strip is transferred;
A feed side clamping mechanism that clamps the strip to the bending apparatus on the upstream side of the heating source in the direction of transport of the strip;
The strip material is disposed inside the inner frame and is supported by the strip material, which is a workpiece to penetrate through the inside of the inner frame, so as to be slidable downstream of the heating source in the transport direction of the strip material. A bending side support mechanism that supports the frame in a movable manner;
Drive means for rotating the inner frame around a vertical axis with respect to the outer frame and a horizontal axis perpendicular to the transfer direction of the strip material with the center of the spherical bearing as the center.
[0020]
According to the present invention, the strip is heated by the heating source and supported by the bending side support mechanism so as to be movable on the inner frame. By pivoting about a horizontal axis perpendicular to the transfer direction, the support point becomes a bending power point accompanying the rotation of the inner frame, and the heating point by the heating source becomes the bending point. As a result, the strip can be bent around a vertical axis and a horizontal axis perpendicular to the direction of transport of the strip. At this time, since the strip is movable with respect to the inner frame, that is, the bending side of the strip is not restrained, it is restrained by the relative positional relationship between the strip and the center of the spherical bearing. Bending is performed without any problems.
[0021]
8) An inner frame that is rotatably supported in a three-dimensional direction via a spherical bearing inside an outer frame disposed in a vertical plane;
A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position in the direction in which the strip is transferred;
A feed side clamping mechanism that clamps the strip to the bending apparatus on the upstream side of the heating source in the direction of transport of the strip;
The strip material is disposed inside the inner frame and is supported by the strip material, which is a workpiece to penetrate through the inside of the inner frame, so as to be slidable downstream of the heating source in the transport direction of the strip material. A bending side support mechanism that supports the frame in a movable manner;
Drive means for rotating the inner frame in a three-dimensional direction with respect to the outer frame with the center of the spherical bearing as the center.
[0022]
According to the present invention, in addition to the case of 7) above, the strip can be bent around the same horizontal axis as the feed direction of the strip, that is, in the twisting direction of the strip. At this time, since the strip is movable with respect to the inner frame, that is, the bending side of the strip is not restrained, it is restrained by the relative positional relationship between the strip and the center of the spherical bearing. Bending is performed without any problems.
[0023]
9) In the bending apparatus for strip material described in 7) or 8) above,
The bending-side support mechanism has an L-shaped bending-side support bracket, and is formed so that the bending-side support bracket is brought into contact with and separated from the strip by driving of the driving means. Each roller is provided so as to be rotatable on two sides, and each roller is in contact with the surface of the strip material so that the strip material is movably supported with respect to the inner frame.
[0024]
According to the present invention, the rollers respectively disposed on the two L-shaped sides of the bending-side support metal abut against the surface of the strip material so that the strip material is movably supported on the inner frame.
[0025]
10) In the bending apparatus for any one strip described in 7) or 8) above,
The bending-side support mechanism has an L-shaped bending-side support bracket, and is formed so that the bending-side support bracket is brought into contact with and separated from the strip by driving of the driving means. Rollers are provided on the two sides so as to be rotatable, and each roller abuts on the surface of the strip material so that the strip material is movably supported with respect to the inner frame. The both ends of the L-shape of the bending-side support bracket that is separated from the strip by the driving of this are in contact with the inner peripheral surface of the inner frame so that the position of the bending-side support bracket is regulated.
[0026]
According to the present invention, in addition to the case of the above invention 9), when the strip material is released, both L-shaped end faces of the bending-side presser metal which is separated from the strip material by driving of the driving means are on the inner peripheral surface of the inner frame. Since it contacts, the position of this bending side pressing metal fitting is fixed.
[0027]
11) In the bending apparatus for any one strip described in 1) to 10) above,
The heating source was formed of a high-frequency heating coil arranged to inductively heat the strip material in the vicinity of the center of the spherical bearing.
[0028]
According to the present invention, it is possible to perform a predetermined bending process in a state where the heating point by the high-frequency heating coil and the center of the spherical bearing are matched.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0030]
FIG. 1 is a plan view showing a strip bending apparatus according to the present embodiment, FIG. 2 is a partially cut away front part of FIG. 1, and is an enlarged side view. FIG. FIG. 4 is a sectional view taken along line I-II in FIG. As shown in these drawings, the member to be processed according to this embodiment is a T-longi strip (hereinafter simply referred to as strip) 01, and the “X axis” is parallel to the transport direction of the strip 01. The horizontal axis “Y axis” is a horizontal axis perpendicular to the X axis in the horizontal plane including the X axis, and “Z axis” is an axis perpendicular to the X axis and the Y axis.
[0031]
As shown in FIGS. 1 to 4, the common pedestal 1 is a fixed portion disposed on a floor surface of a factory or the like, and a plurality of strip material placement rollers 2, a feed base 3, and an outer frame 4 are the strip material 01. They are sequentially arranged along the transfer direction (from the right side to the left side in FIG. 1 along the X-axis direction). The strip material 01 is transferred by rolling of the strip material placing roller 2, passes through the high-frequency heating coil 5 disposed inside the feed base 3 and the outer frame 4, and is induction-heated by the high-frequency heating coil 5. That is, this embodiment is a case where the heating source is formed by the high frequency heating coil 5. Here, the high frequency heating coil 5 may adopt not only a configuration in which the strip material 01 is penetrated but also a configuration in which the high frequency heating coil 5 is brought close to the heating portion of the strip material 01 and along the strip material 01. The feed stand 3 has a feed roller 6, a feed-side pressing bracket 7 and a feed-side clamp stand 8 inside thereof. The feed roller 6 holds the web 01a of the strip material 01 between the pair of rollers 6a and 6b, and transports the strip material 01 by its rotation. The feed-side clamp 7 is attached to the tip of a pitonron of a feed-side clamp cylinder (not shown), and is connected to the feed-side clamp stand 8 fixed to the feed stand 3 by driving the feed-side clamp cylinder. Hold the strip 01 and clamp it.
[0032]
The outer frame 4 is a rectangular frame that combines four sides of equal length, and a ball segment 9a that is a part of an arc whose center is the center of the outer frame 4 at the center of each side, 9b, 9c, 9d are fixed. The inner frame 10 is a frame formed by combining six sides of equal length, and spherical bearing pieces 11a, 11b, 11c, and 11d are fixed to the opposite sides of the outer frame 4, and these spherical bearing pieces 11a. ˜11d and the ball segments 9a to 9d are supported on the outer frame 4. That is, the inner frame 10 is supported by the outer frame 4 through a spherical bearing centered on the center A, which is composed of spherical shaft pieces 9a to 9d and spherical bearing pieces 11a to 11d. As a result, the inner frame 10 is centered on the center A. As a rotation center, it can be rotated in any direction of the three-dimensional space. The rotation of the inner frame 10 at this time is θ ₁ Strip bending cylinders 12a, 12b, θ ₂ Strip bending cylinders 13a, 13b and θ _Three This is done by driving the strip bending cylinders 14a and 14b.
[0033]
θ ₁ The strip bending cylinders 12a and 12b have the inner frame 10 as θ ₁ Direction (rotation direction around the Z axis in the XY plane), θ ₂ The strip bending cylinders 13a and 13b have the inner frame 10 as θ ₂ Direction (rotation direction around the Y axis in the XZ plane), θ _Three The strip bending cylinders 14a, 14b _Three It is rotated in the direction (the rotation direction around the X axis in the YZ plane). More specifically, θ ₁ The strip bending cylinders 12a, 12b are pivoted at their ends through spherical bearings 16a, 16b on mounting bases 15a, 15b protruding horizontally in the X-axis direction and fixed to the outer frame 4. It is attached as possible. Similarly, θ ₂ The strip bending cylinders 13a and 13b are pivoted at the end portions of the cylinder portions via the spherical bearings 18a and 18b on the mounting bases 17a and 17b protruding in the horizontal direction along the X-axis direction and fixed to the outer frame 4. Is attached, and θ _Three The strip bending cylinders 14a and 14b are mounted on mounting bases 19a and 19b formed integrally with the outer frame 4 so as to protrude in the horizontal direction along the Y-axis direction. It is pivotally attached. On the other hand, the spherical bearing struts 21a, 21b, 21c, and 21d integrally fix the inner frame 10 and the spherical bearing pieces 11a to 11d, and penetrate the spherical shaft pieces 9a to 9d and the outer frame 4 so that their tips are outside. It faces the outside of the frame 4. θ ₁ Strip bending cylinders 12a, 12b and θ _Three The piston rods of the strip bending cylinders 14a and 14b are connected to the tip ends of the spherical bearing struts 21b and 21d via spherical bearings (22a and 24a) and (22b and 24b), respectively, and θ ₂ The piston rods of the strip bending cylinders 13a and 13b are connected to the tip ends of the spherical bearing columns 21a and 21c via the spherical bearings 23a and 23b, respectively.
[0034]
A clamp mechanism for the strip material 01 is formed inside the inner frame 10. In the present embodiment, since the T longi strip is used as a workpiece, a bending side clamping mechanism is provided that can clamp the T longi strip satisfactorily. That is, the bending side press fitting 26 that comes in contact with and separates from the strip material 01 by driving the bending side clamp cylinder 25 is formed in an L shape, and each side of the L shape is one side of the web 01a of the strip material 01. While abutting against the back surface of the face 01b, the top of the L-shape abuts against the intersection of the web 01a and the face 01b, and holds the strip material 01 between the bending side clamp mount 27 and clamps it. ing. The bending-side clamp mount 27 has a window that is an L-shaped opening to secure a space for the bending-side presser fitting 26 and is fixed to the inner frame 10. The bending side clamp mount 27 is provided with bending side clamp brackets 28a and 28b, which are rectangular parallelepiped blocks, facing the window. The bending side clamp bracket 28a abuts against one surface of the web 01a of the strip material 01 to regulate its position in the Z-axis direction, and the bending side clamp bracket 28b abuts against the surface of the face 01b of the strip material 01 The position in the Y-axis direction is restricted. In other words, the strip 01 is placed on the bending side clamp receiving metal 28a, and the position of the face 01b is regulated by the bending side clamp receiving metal 28b.
[0035]
Here, a bracket 29 provided with a plurality of (four in this embodiment) holes 29a, 29b, 29c, and 29d arranged in a straight line along the side is fixed to the inner peripheral surface of one side of the inner frame 10. The end of the cylinder part of the bending side clamp cylinder 25 is rotatably attached to any one of these holes 29a to 29d (hole 29a in FIG. 4). A central portion of the bending side presser fitting 26 is rotatably attached to the tip end portion of the piston rod of the bending side clamp cylinder 25. By attaching the bending side clamp cylinder 25 and the bending side presser fitting 26 in this way, the strip material 01 is moved from a predetermined position in the initial state of the heating bending process and immediately before the strip material 01 is clamped on the bending side. Even if it is disposed at a slightly shifted position, the position of the strip 01 can be corrected to a predetermined position and clamped. That is, at the time of clamping the strip material 01 accompanying the heating bending work, first, the horizontal surface of the bending side presser fitting 26 comes into contact with the web 01a of the strip material 01 by the extension of the piston rod accompanying the driving of the bending side clamp cylinder 25. . When the piston rod is further extended in this state, the vertical surface of the bending-side presser fitting 26 abuts on the face 01b of the strip 01 and moves the strip 01 toward the bending-side clamp receiving bracket 28b. 28b. Thus, the position correction and clamping of the strip material 01 can be performed simultaneously.
[0036]
FIG. 4 shows a state in which the strip material 01 is clamped by the bending side presser fitting 26, but when the clamp by the bending side presser fitting 26 is released, the state becomes as shown in FIG. That is, when the clamp by the bending side presser fitting 26 is released, both end faces 26a and 26b of the bending side presser fitting 26 come into contact with the inner peripheral surface of the inner frame 10. By configuring in this way, the positions of the bending side clamp cylinder 25 and the bending side presser fitting 26 can be fixed even when the clamp by the bending side presser fitting 26 is released. Incidentally, when the bending side clamp cylinder 25 and the bending side presser fitting 26 are not fixed in this way, the bending side clamp cylinder 25 swings around the attachment point of the cylinder portion with respect to the bracket 29 and the bending side presser fitting 26 swings around the attachment point of the bending side clamp cylinder 25 to the piston rod. As described above, the structure for fixing the positions of the bending side clamp cylinder 25 and the bending side holding metal fitting 26 when the clamp by the bending side holding metal fitting 26 is released includes the expansion stroke of the piston rod of the bending side clamp cylinder 25 and the bending side. This can be easily realized by adjusting the relationship with the length of each L-shaped side of the presser fitting 26.
[0037]
In the strip bending apparatus according to the present invention, it is important to adjust the neutral point in the bending process in order to perform the bending process well. Here, the “neutral point” is a transition point from a portion where tensile stress is applied to a workpiece to be processed during bending to a portion where compressive stress is applied, and the point at which the stress at this time becomes zero. Say. If the compressive stress increases more than a certain level as a result of bending, buckling occurs at that portion. Therefore, it is necessary to adjust the neutral point so that such a state does not occur.
[0038]
As shown in FIG. 5, a case is considered in which, for example, a strip 01, which is a T longi strip, is rotated and bent around the Z axis in the XY plane. In this case, when a bending force is applied in the right direction in the figure, a tensile stress is applied to the face 01b side of the strip material 01 and a compressive stress is applied to the web 01a side, and this compressive stress is greatest at the end of the web 01a. Therefore, it is necessary to adjust the neutral point A ′ so as not to cause buckling at this end. Since the neutral point A ′ in this case is given as the bending center of the bending apparatus (the center A of the spherical bearing), the point of the strip material 01 that coincides with the center A at the clamp position of the strip material 01 by the bending side presser fitting 26. Is the neutral point. Therefore, in order to satisfactorily perform bending of the member to be processed by the bending apparatus, the relative positional relationship between the center A and the member to be heated is set to appropriately set the neutral point according to the shape of the member to be heated. Adjustment is essential. In the present embodiment, the following configuration is adopted so that the neutral point A ′ can be adjusted appropriately.
[0039]
The outer frame 4 is configured to be able to adjust the position in the Y-axis direction (perpendicular to the direction in which the strip 01 is transferred) with respect to the common base 1. Specifically, it has nut portions 30a and 30b that have female screw portions and are fixed to the common base 1, and neutral point adjusting screws 31a and 31b that have male screw portions that are screwed to the nut portions 30a and 30b. By rotating the point adjusting screws 31a and 31b, the tip thereof comes into contact with the side surface of the outer frame 4 and moves along the Y-axis direction. At this time, the inner frame 10, the bending side clamp cylinder 25, the bending side press fitting 26, the bending side clamp mount 27, and the bending side clamp receiving fittings 28 a and 28 b move integrally with the outer frame 4. Thus, the relative position of the center A point with respect to the strip material 01 can be arbitrarily adjusted by adjusting the amount of protrusion from the nut portions 30a, 30b at the front ends of the neutral point adjusting screws 31a, 31b. Incidentally, in this case, the conveying path of the strip material 01 constituted by the common pedestal 1 and the strip material placing roller 2 is a fixed portion.
[0040]
FIGS. 6 and 7 show FIGS. 4 and 5 when the neutral point A ′ is changed to the neutral point A ″ by moving the outer frame 4 with the neutral point adjusting screws 31a and 31b as described above. 6 is a diagram when the strip material 01 is clamped by the bending side presser fitting 26, and FIG. 7 is a diagram when the strip material 01 is released by the bending side presser fixture 26. As shown in both figures, the neutral point A ″ is determined at the position of the center A of the spherical bearing constituted by the spherical shaft pieces 9a to 9d and the spherical bearing pieces 11a to 11d. That is, the neutral point A ″ moves to the left in the drawing along the Y-axis direction with respect to the neutral point A ′. Therefore, the bending-side clamp bracket 28b that abuts the surface of the face 01b of the strip material 01 and regulates the position of the surface position on the Y-axis is the position and the bending side of the surface of the face 01b of the strip material 01 to be regulated. It is necessary to replace the clamp base 27 with an appropriate one in consideration of the distance of the clamp base 27. Therefore, the bending side clamp brackets 27a and 32b are fixed to the bending side clamp frame 27 in place of the bending side clamp brackets 28a and 28b (the bending side clamp bracket 28a is not necessarily replaced). In this case, the mounting position of the bending side clamp cylinder 25 with respect to the bracket 29 also needs to be changed. In order to clamp the strip material 01 with the bending side press fitting 26 while the bending side press fitting 26 is in contact with the web 01a and the face 01b of the strip material 01, the mounting position and the bending side of the bending side clamp cylinder 25 with respect to the bracket 29 are used. A straight line connecting the L-shaped apex of the presser fitting 26 and a straight line connecting the mounting position of the bending-side clamp cylinder 25 to the bracket 29 and the intersection of the web 01a and the face 01b of the strip material 01 at a predetermined position to be clamped. This is because they need to be matched as much as possible. Therefore, in the case shown in FIGS. 6 and 7, the bending side clamp cylinder 25 is attached to the bracket 29 using the hole 29 b of the bracket 29.
[0041]
The high-frequency heating coil 5 is formed in a shape that surrounds the strip material 01 with a predetermined gap and is basically disposed in a vertical plane including the center A. More specifically, a matching transformer 33 for efficiently supplying a high-frequency current to the high-frequency heating coil 5 is arranged on the feed base 3 so as to be linearly movable in the X-axis direction of FIG. . The high frequency heating coil 5 is connected to the matching transformer 33 and is configured to move integrally with the matching transformer 33 in the X-axis direction. Thus, the high-frequency heating coil 5 basically inductively heats the strip 01 at a predetermined position in the vertical plane including the center A so that the center A becomes an action point of the bending stress at this time. When 01 is twisted around the X axis, a larger bending stress is required than when bending is performed by rotating around the other Y and Z axes. Therefore, when the twist bending process is performed, it is necessary to heat a wider area with the high-frequency heating coil 5 than in other cases. Such heating in a wide area can be dealt with by increasing the width of the high-frequency heating coil 5. However, in this case, the high-frequency heating coil 5 is configured to be wide only for twisting and bending. When the two types of bending processes are performed, the high-frequency heating coil 5 is unnecessarily increased in size. In order to avoid such a problem, in this embodiment, the high-frequency coil 5 is moved along the X-axis direction in the right direction in FIG. 2 (the direction opposite to the direction in which the strip material 01 is transferred) to expand the effective heating region. . Thus, the high frequency heating coil 5 only needs to have a heating width for bending around the Y axis and the Z axis.
[0042]
The strip material 01 is bent by the bending apparatus as described above in the following manner. First, the neutral point A ′ (A ″) is adjusted. That is, the position of the outer frame 4 in the Y-axis direction is adjusted based on a predetermined neutral point. Thereafter, the strip material 01 is intermittently bent while being transferred by a certain amount. That is, bending is performed in the following sequence.
(1) A certain amount of strip material 01 is transferred. This transfer is performed by driving the strip material placement roller 2 and the feed roller 6.
▲ 2 ▼ θ ₂ Direction and θ _Three Θ is fixed ₁ Bending direction. Specifically, in a state where the strip material 01 is clamped by the feed side presser fitting 7 and the bending side presser fixture 26, while the strip material 01 is heated by the high frequency heating coil 5, θ ₁ The strip bending cylinders 12a and 12b are driven. The driving force at this time is transmitted to the spherical bearing struts 21b and 21d via the spherical bearings 22a and 22b, and the inner frame 10 supported rotatably on the outer frame 4 via the spherical bearing is applied to the outer frame 4. Around the center A ₁ Rotate in the direction. As a result, the clamping position of the strip material 01 by the bending side holding metal fitting 26 becomes a power point, the heating position by the high-frequency heating coil 5 becomes the bending point, and the bending stress of the Z axis is applied to the strip material 01, and the strip material 01 θ ₁ Bending in the direction is performed.
▲ 3 ▼ θ ₁ After bending the direction to the target shape, θ ₁ Direction and θ _Three Θ is fixed ₂ Bending direction. Specifically, in the same state as (2), θ ₂ The strip bending cylinders 13a and 13b are driven. The driving force at this time is transmitted to the spherical bearing columns 21a and 21c through the spherical bearings 23a and 23b. As a result, the inner frame 10 supported by the outer frame 4 is centered on the center A and θ ₂ Rotate in the direction θ ₂ Bending in the direction is performed.
▲ 4 ▼ θ ₂ After bending the direction to the target shape, θ ₁ Direction and θ ₂ Θ is fixed _Three Direction bending (twisting) is performed. Specifically, in the same state as (2), θ _Three The strip bending cylinders 14a and 14b are driven. The driving force at this time is transmitted to the spherical bearing struts 21b and 21d via the spherical bearings 24a and 24b, and the inner frame 10 supported by the outer frame 4 is centered on the center A as θ. _Three Rotate in the direction. At this time, the effective heating width is expanded by moving the high-frequency heating coil 5 integrally with the matching transformer 33 in the direction opposite to the transfer direction of the strip material 01 along the X-axis direction. As a result, θ of the strip 01 _Three Bending in the direction (twisting) is performed.
(5) The strip material 01 is transferred by a certain amount, and the operations (2) to (4) are repeated to bend into a desired three-dimensional shape. That is, the bending process is θ ₁ Direction, θ ₂ Direction and θ _Three Intermittent bending in which minute bending in the direction is sequentially performed.
[0043]
In the bending process as described above, the transfer amount of the strip material 01 is determined by the curvature of the bending process. That is, the feed pitch is made finer where the curvature is small. This can improve the bending accuracy. On the other hand, the feed pitch is roughened where the curvature is large. As a result, the working efficiency of bending can be improved. Further, in order to bend the strip material 01 into a predetermined shape, along with the transport of the strip material 01, θ ₁ ~ Θ _Three Driving control of the strip bending cylinders 12a, 12b, 13a, 13b, 14a, and 14b is required. Such control can be performed satisfactorily by using, for example, CAD data of the strip 01.
[0044]
In the above embodiment, the position of the neutral point A ′ (A ″) of the strip 01 given by the position of the bending center A at the time of bending is adjusted by moving the outer frame 4 in the Y-axis direction. The neutral point A ′ (A ″) can be adjusted by adjusting the relative positional relationship between the center A and the workpiece such as the strip 01. Therefore, it is not necessary to limit to the above embodiment. For example, a clamp mechanism for the workpiece, such as a bending-side presser fitting 26, is attached to the inner frame 10 so as to be movable in the Y-axis direction, and the outer frame 4 is integrated with the inner frame 10 in the same manner as in the above embodiment. It may be formed so as to be movable in the Y-axis direction. In this case, the workpiece is clamped by the clamp mechanism, and the outer frame 4 is moved in the Y-axis direction while the clamp mechanism is movable with respect to the inner frame 10 to adjust the position in the Y-axis direction. What is necessary is just to fix a clamp mechanism with fastening members, such as a volt | bolt, with respect to the inner frame 10 after this adjustment is completed. Since the workpiece is clamped by the clamp mechanism and fixed to the common pedestal 1 or the like, which is a fixing portion, the neutral of the workpiece to be given at the center A by adjusting the position of the outer frame 4 in the Y-axis direction. This is because the point can be adjusted. Therefore, in this case, there is no need to replace the bending side clamp brackets 28a, 28b, (32a, 32b) which are required every time the neutral point is changed in the above embodiment.
[0045]
In the apparatus according to the embodiment as described above, the bending side clamping mechanism is formed on the downstream side of the high-frequency heating coil 5 that is a heating source so as to clamp the strip material 01 on the bending side. There is no need to configure. On the bending side, the strip material 01 may be formed to be movable with respect to the inner frame 10.
[0046]
Another embodiment of the present invention configured to support the strip material 01 so as to be movable with respect to the inner frame 10 will be described with reference to FIGS. 8 and 9. 8 is a side view of the apparatus according to the present embodiment corresponding to FIG. 2, FIG. 9 is a cross-sectional view of the apparatus according to the present embodiment corresponding to FIG. 4, and is a cross-sectional view taken along the line III-III in FIG. In both figures, the same parts as those in FIGS. 2 and 4 are denoted by the same reference numerals, and redundant description is omitted.
[0047]
As shown in FIGS. 8 and 9, on the bending side, which is downstream of the high-frequency heating coil 5, the strip material 01 is formed so as to be movably supported by the inner frame 10. That is, the bending side support mechanism has an L-shaped bending side support metal fitting 34, and the bending side support metal fitting 34 is brought into contact with and separated from the strip material 01 by driving the bending side clamp cylinder 25 which is a driving means. It is formed. Rollers 36a and 36b are provided on the two L-shaped sides of the bending-side support bracket 34 so as to be rotatable about a horizontal shaft 35a and a vertical shaft 35b, respectively, and the rollers 36a and 36b are respectively provided on the web 01a and the strip 01. It contacts the surface of the face 01b. On the other hand, on the opposite side of the web 01a and the face 01b of the strip material 01 with respect to the rollers 36a and 36b, rollers 38a and 38b that are respectively rotatable around the horizontal shaft 37a and the vertical shaft 37b are arranged. It is set up. That is, an L-shaped frame body 40 is fixed to the edge of the bending side support frame 39 having an L-shaped window integrally fixed to the inner frame 10. The rollers 38a and 38b are supported on two sides of the body 40, respectively. Thus, the strip material 01 is supported so as to be slidable between the rollers 36a and 37a and the rollers 36b and 37b, and is movable with respect to the inner frame 10.
[0048]
The support metal guides 41a and 41b protrude to the inside of the inner frame 10 and are fixed to the inner peripheral surface thereof. The support metal guides 41a and 41b are in contact with both end portions of the L-shaped bending side support metal 34, respectively. The position is regulated on the downstream side in the transport direction of the strip 01. At this time, a similar support metal guide (not shown) may be provided on the upstream side to restrict the position of the bending side support metal 34. In the present embodiment, unlike the above-described embodiment, the bending-side support metal fitting 34 does not restrain the strip material 01. Therefore, the bending-side support is supported by the frictional force between the strip material 01 and the rollers 36a, 36b, 38a, 38b. The metal fitting 34 is provided to restrict the movement of the strip material 01 that is pulled in the moving direction.
[0049]
In this embodiment, the strip material 01 is bent in the same manner as in the above embodiment, but on the bending side in the bending processing, the strip material 01 is passed through rollers 36a, 36b, 38a, 38b. Since it supports, the said strip material 01 is not restrained by the bending side. Therefore, even if the strip material 01 is stretched in the axial direction by heating by the high-frequency heating coil 5, not only can this elongation be absorbed, but also the relative positional relationship between the strip material 01 and the inner frame 10, in other words, a spherical surface. Regardless of the relative positional relationship with the center A of the bearing, the strip 01 can be bent around the inherent neutral point inherent to the strip 01. That is, a desired bending process can be performed with the smallest bending moment.
[0050]
In both the above-described embodiments, the member to be processed is a T longi strip, but it is not necessary to limit the cross-sectional shape as long as it is a strip. Of course, an angle material, other special shapes, or materials other than those used as an aggregate of a hull shell plate may be used.
[0051]
In the above-described embodiment, the heating source is formed by the high-frequency heating coil 5, and the high-frequency heating coil 5 includes the center A and the strip material 01 is within a plane perpendicular to the transfer direction of the strip material 01. Although it has been arranged to penetrate through the inside, it is not necessarily limited to such a configuration. For example, a heating means such as a high-frequency heating coil or a gas burner is held by an arm of an existing industrial robot, and a predetermined position of the strip material 01 is heated by these heating means by controlling the position of the arm of the industrial robot. It may be configured.
[0052]
【The invention's effect】
As described in detail in conjunction with the above-described embodiments, the invention described in [Claim 1] is supported on the inner side of an outer frame disposed in a vertical plane so as to be rotatable in a three-dimensional direction via a spherical bearing. The inner frame, a heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position in the direction in which the strip is transported, and the bending apparatus that is upstream of the heating source in the direction in which the strip is transported. A clamping mechanism on the feed side, and a strip which is disposed on the inside of the inner frame and penetrates the inside thereof, by clamping the strip on the downstream side of the heating source in the transport direction of the strip. Bending-side clamp mechanism that fixes the strip to the inner frame, and a horizontal axis that is centered on the center of the spherical bearing and that has the inner frame about the vertical axis with respect to the outer frame and perpendicular to the direction in which the strip is transported And drive means for rotating.
[0053]
Therefore, in a state where the strip material is heated by the heating source and clamped to the inner frame by the bending side clamp mechanism, the horizontal axis that is perpendicular to the vertical direction of the inner frame with respect to the outer frame by the driving means and perpendicular to the direction in which the strip material is transferred. By rotating around, the clamp point becomes the power point of the bending process with the rotation of the inner frame, and the heating point by the heating source becomes the bending point. As a result, the strip can be automatically bent around the vertical axis and the horizontal axis perpendicular to the direction of transport of the strip according to the amount of rotation of the inner frame by the drive of the drive means. In addition, since the amount of bending at this time can be controlled by controlling the driving amount of the driving means, the reproducibility is also good.
[0054]
Further, since the bending side of the strip material during the bending process is clamped, the neutral point of the strip material in the bending process is defined by the center position of the spherical bearing, and the bending process is performed around the neutral point. . As a result, accurate bending can be performed.
[0055]
The invention described in [Claim 2] includes an inner frame that is rotatably supported in a three-dimensional direction via a spherical bearing on the inner side of an outer frame disposed in a vertical plane; A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position, a feed-side clamp mechanism that clamps the strip to the bending apparatus on the upstream side of the heating source in the strip transfer direction, and an inner frame The strip is fixed to the inner frame by clamping the strip, which is a workpiece to be processed, penetrating through the inside thereof, on the downstream side of the heating source in the transport direction of the strip. A bending-side clamping mechanism; and a driving means for rotating the inner frame in a three-dimensional direction with respect to the outer frame with the center of the spherical bearing as a center.
[0056]
Therefore, in addition to the case of the invention described in [Claim 1], the strip can be bent around the same horizontal axis as the feed direction of the strip, that is, in the twisting direction of the strip. Further, as in the case of the invention described in [Claim 1] above, the bending side of the strip during bending is clamped, so the neutral point of the strip during bending is the center position of the spherical bearing. Since bending is performed around this neutral point, it is possible to perform bending with high accuracy.
[0057]
In the invention described in [Claim 3], in the strip bending apparatus described in [Claim 1] or [Claim 2], the relative positional relationship between the center position of the spherical bearing and the position of the strip is changed. In order to be able to do so, the outer frame was formed integrally with the inner frame so as to be movable in a direction perpendicular to the direction in which the strip material was transferred.
[0058]
As a result, the relative positional relationship between the center position of the spherical bearing and the position of the strip can be changed, and the position of the neutral point of the strip in the bending process given by the center position of the spherical bearing can be arbitrarily adjusted. Therefore, it is possible to adjust an appropriate neutral point position according to processing conditions such as the shape of the strip and the bending curvature.
[0059]
The invention described in [Claim 4] is a strip bending apparatus according to [Claim 1] or [Claim 2], in which the relative positional relationship between the center position of the spherical bearing and the position of the strip is changed. The outer frame is integrated with the inner frame so as to be movable in a direction perpendicular to the direction of the strip material, and the clamp mechanism can be moved in a direction perpendicular to the direction of the strip material. Attached to the inner frame.
[0060]
As a result, if the outer frame is moved in a state where the strip material is clamped to the inner frame by the clamping mechanism, the inner frame and the outer frame can move together with respect to the clamping mechanism. Since the relative positional relationship with the position of the strip can be changed, the same effect as that of the invention described in [Claim 3] is achieved.
[0061]
[Claim 5] The invention described in [Claim 5] is the bending apparatus for bending material according to any one of [Claim 1] to [Claim 4], wherein the bending side clamp mechanism is an L-shaped bending side presser fitting. The bending side presser fitting is formed so as to be in contact with and away from the strip by driving the driving means, and the two L-shaped sides of the bending side presser fitting are brought into contact with the surface of the strip, respectively. This strip was formed so as to be clamped to the inner frame.
[0062]
As a result, the two L-shaped sides of the bending side presser fitting can be brought into contact with the surface of the strip material, and the strip material can be clamped to the inner frame. For this reason, it is most suitable for clamping of strips in which the web and the face cross each other at right angles, such as T longi strips. In addition, it is possible to perform clamping at two locations simultaneously with one driving means.
[0063]
The invention described in [Claim 6] is the bending apparatus for bending material according to any one of [Claim 1] to [Claim 4], wherein the bending side clamp mechanism is an L-shaped bending side presser fitting. The bending side presser fitting is formed so as to be in contact with and away from the strip by driving the driving means, and the two L-shaped sides of the bending side presser fitting are brought into contact with the surface of the strip, respectively. While this strip is formed to be clamped to the inner frame, when the strip is released, the L-shaped end faces of the bending-side presser fitting separated from the strip by the driving means abut against the inner peripheral surface of the inner frame. It was formed so that the position of the lever side holding metal fitting was regulated.
[0064]
As a result, in addition to the invention described in [Claim 5], when the strip material is released, both L-shaped end surfaces of the bending-side presser foot that are separated from the strip material by driving of the driving means abut against the inner peripheral surface of the inner frame. The position of the bending side presser fitting is fixed in contact. Therefore, it is possible to integrally fix the bending side presser fitting and the driving means to the inner frame.
[0065]
The invention described in [Claim 7] includes an inner frame that is rotatably supported in a three-dimensional direction through a spherical bearing inside an outer frame disposed in a vertical plane, A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position, a feed-side clamp mechanism that clamps the strip to the bending apparatus on the upstream side of the heating source in the strip transfer direction, and an inner frame The strip material, which is a workpiece to be processed and penetrates the inside of the strip material, is slidably supported on the downstream side of the heating source in the transport direction of the strip material. A bending-side support mechanism that supports the slidable movement, and a drive that rotates around the vertical axis about the center of the spherical bearing and a horizontal axis that is perpendicular to the outer frame and a direction perpendicular to the transfer direction of the strip. Means.
[0066]
Therefore, the strip is heated by a heating source and supported by the bending side support mechanism so as to be movable on the inner frame. The driving means rotates the inner frame about the vertical axis with respect to the outer frame and is perpendicular to the direction in which the strip is transported. By rotating about a horizontal axis, the support point becomes a bending point of the bending process with the rotation of the inner frame, and the heating point by the heating source becomes the bending point. As a result, the same operations and effects as the invention described in [Claim 1] are obtained. Furthermore, since the strip is not restrained on the bending side, it is smallest without adjusting the relative positional relationship between the strip and the inner frame, in other words, the relative positional relationship with the center of the spherical bearing. A desired bending process can be performed with the bending moment.
[0067]
The invention described in [Claim 8] includes an inner frame that is rotatably supported in a three-dimensional direction via a spherical bearing inside an outer frame disposed in a vertical plane, A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position, a feed-side clamp mechanism that clamps the strip to the bending apparatus on the upstream side of the heating source in the strip transfer direction, and an inner frame The strip material, which is a workpiece to be processed and penetrates the inside of the strip material, is slidably supported on the downstream side of the heating source in the transport direction of the strip material. It has a bending side support mechanism that supports it so as to be movable, and drive means for rotating the inner frame in a three-dimensional direction with respect to the outer frame with the center of the spherical bearing as the center.
[0068]
As a result, in addition to the case of the invention described in [Claim 7], the strip can be bent around the same horizontal axis as the feed direction of the strip, that is, in the twisting direction of the strip. At this time, as in the invention described in [Claim 7], since the strip is not restrained on the bending side, it is most effective without adjusting the relative positional relationship between the strip and the center of the spherical bearing. A desired bending process can be performed with a small bending moment.
[0069]
The invention described in [Claim 9] is the strip material bending apparatus according to [Claim 7] or [Claim 8], wherein the bending side support mechanism has an L-shaped bending side support fitting, The bending side support fitting is formed so as to be in contact with and away from the strip material by driving means, and rollers are provided on the two L-shaped sides of the bending side support fitting so as to be rotatable. The strip material was formed so as to contact the surface of the material so as to be movable with respect to the inner frame.
[0070]
As a result, the rollers respectively provided on the two L-shaped sides of the bending side support metal fitting can be brought into contact with the surface of the strip material so that the strip material can be movably supported on the inner frame. For this reason, it is most suitable for supporting a strip material in which the web and the face intersect each other at right angles, such as a T-longi strip material. Further, it is possible to support two places with one driving means.
[0071]
The invention described in [Claim 10] is the bending apparatus for bending material according to any one of [Claim 7] or [Claim 8], wherein the bending side support mechanism is an L-shaped bending side support bracket. The bending side support fitting is formed so as to be in contact with and separated from the strip by driving of the driving means, and a roller is provided on each of the two L-shaped sides of the bending side support fitting so as to be rotatable. Each roller is in contact with the surface of the strip material so that the strip material is movably supported with respect to the inner frame. The both ends of the L-shape are in contact with the inner peripheral surface of the inner frame so that the position of the bending side support metal fitting is regulated.
[0072]
As a result, in addition to the invention described in (Claim 9), at the time of release of the strip material, the L-shaped end faces of the bending side presser fitting separated from the strip material by driving of the driving means abut against the inner peripheral surface of the inner frame. The position of the bending side support metal fitting is fixed in contact. Therefore, the bending side support fitting and the driving means can be integrally fixed to the inner frame.
[0073]
The invention described in [Claim 11] is the bending apparatus for a strip material according to any one of [Claim 1] to [Claim 10], wherein the heating source is formed in the vicinity of the center of the spherical bearing. The material was formed with a high frequency heating coil arranged to be induction heated.
[0074]
As a result, it is possible to perform a predetermined bending process with high accuracy in a state where the heating point by the high-frequency heating coil and the center of the spherical bearing are matched.
[Brief description of the drawings]
FIG. 1 is a plan view showing a strip bending apparatus according to an embodiment of the present invention.
FIG. 2 is an enlarged side view showing the front part of FIG.
3 is a cross-sectional view taken along the line II of FIG.
4 is a cross-sectional view taken along a line II-II in FIG. 2 (a state in which a strip 01 is clamped at a neutral point A ′).
FIG. 5 is a cross-sectional view taken along the line II-II in FIG.
6 is a cross-sectional view taken along the line II-II in FIG. 2 (a state where the strip material 01 is clamped at a neutral point A ″).
7 is a cross-sectional view taken along the line II-II in FIG. 2 (a state where the strip material 01 is clamped at a neutral point A ″).
FIG. 8 is a side view showing a portion corresponding to FIG. 2 in another embodiment of the present invention.
9 is a cross-sectional view taken along line III-III in FIG.
FIG. 10 is a side view showing a strip (T longi strip) that is a member to be heated.
[Explanation of symbols]
A center
A ', A''neutral point
01 strip
4 outer frame
5 High-frequency heating coil
7 Feeding side clamp
8 Feeding side clamp mount
9a, 9b, 9c, 9d Spherical fragment
10 Inner frame
11a, 11b, 11c, 11d Spherical bearing piece
12a, 12b, 12c, 12d θ ₁ Strip bending cylinder
13a, 13b, 13c, 13d θ ₂ Strip bending cylinder
14a, 14b, 14c, 14d θ _Three Strip bending cylinder
25 Bending cylinder
26 Bending side clamp
26a, 26b end face
30a, 30b Nut
31a, 31b Neutral point adjustment screw
34 Bending-side support bracket
36a, 36b, 38a, 38b Roller

Claims

An inner frame supported in a three-dimensional direction via a spherical bearing inside an outer frame disposed in a vertical plane;
A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position in the direction in which the strip is transferred;
A feed-side clamp mechanism that clamps the strip material to the bending device on the upstream side of the heating source in the direction of transport of the strip material, and a strip material that is a workpiece to be disposed inside the inner frame and penetrates the inside A bending side clamping mechanism for fixing the strip to the inner frame by clamping the strip on the downstream side of the heating source in the direction of transport of the strip,
Drive means for rotating the inner frame about a vertical axis with respect to the outer frame and a horizontal axis perpendicular to the direction of transport of the strip, with the center of the spherical bearing as the center. Bending device.

An inner frame supported in a three-dimensional direction via a spherical bearing inside an outer frame disposed in a vertical plane;
A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position in the direction in which the strip is transferred;
A feed side clamping mechanism that clamps the strip to the bending apparatus on the upstream side of the heating source in the direction of transport of the strip;
The strip is disposed on the inner frame and clamped on the downstream side of the heating source with respect to the strip in the transfer direction of the strip. A bending side clamping mechanism to be fixed;
A strip bending apparatus characterized by comprising driving means for rotating the inner frame in a three-dimensional direction with respect to the outer frame with the center of the spherical bearing as the center.

In the bending apparatus for the strip material according to [Claim 1] or [Claim 2],
The outer frame is integrated with the inner frame so that it can move in a direction perpendicular to the direction of the strip material so that the relative positional relationship between the center position of the spherical bearing and the position of the strip material can be changed. A strip bending apparatus characterized by the following.

In the bending apparatus for the strip material according to [Claim 1] or [Claim 2],
The outer frame is formed integrally with the inner frame so as to be movable in a direction perpendicular to the direction of transport of the strip so that the relative positional relationship between the center position of the spherical bearing and the position of the strip can be changed. The bending material bending apparatus is characterized in that the bending side clamping mechanism is attached to the inner frame so as to be movable in a direction perpendicular to the direction in which the material is transported.

In the bending apparatus for any one of the strips described in [Claim 1] to [Claim 4],
The bending-side clamp mechanism has an L-shaped bending-side presser fitting, and the bending-side presser fitting is formed so as to be in contact with and away from the strip material by driving of the driving means, and the bending-side presser fitting L-shaped A strip bending apparatus characterized in that two strips are brought into contact with the strip surface to clamp the strip on the inner frame.

In the bending apparatus for any one of the strips described in [Claim 1] to [Claim 4],
The bending-side clamp mechanism has an L-shaped bending-side presser fitting, and the bending-side presser fitting is formed so as to be in contact with and away from the strip material by driving of the driving means, and the bending-side presser fitting L-shaped The two sides are brought into contact with the surface of the strip, and the strip is clamped to the inner frame. When the strip is released, the L-shape of the bending-side presser bracket that is separated from the strip by driving the driving means An apparatus for bending a strip material, characterized in that both end surfaces of the strip are in contact with the inner peripheral surface of the inner frame so that the position of the bending side presser fitting is regulated.

An inner frame supported in a three-dimensional direction via a spherical bearing inside an outer frame disposed in a vertical plane;
A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position in the direction in which the strip is transferred;
A feed side clamping mechanism that clamps the strip to the bending apparatus on the upstream side of the heating source in the direction of transport of the strip;
The strip material is disposed inside the inner frame and is supported by the strip material, which is a workpiece to penetrate through the inside of the inner frame, so as to be slidable downstream of the heating source in the transport direction of the strip material. A bending side support mechanism that supports the frame in a movable manner;
Drive means for rotating the inner frame about a vertical axis with respect to the outer frame and a horizontal axis perpendicular to the direction of transport of the strip, with the center of the spherical bearing as the center. Bending device.

An inner frame supported in a three-dimensional direction via a spherical bearing inside an outer frame disposed in a vertical plane;
A heating source such as a high-frequency heating coil that heats the peripheral surface at a specific position in the direction in which the strip is transferred;
A feed side clamping mechanism that clamps the strip to the bending apparatus on the upstream side of the heating source in the direction of transport of the strip;
The strip material is disposed inside the inner frame and is supported by the strip material, which is a workpiece to penetrate through the inside of the inner frame, so as to be slidable downstream of the heating source in the transport direction of the strip material. A bending side support mechanism that supports the frame in a movable manner;
A strip bending apparatus characterized by comprising driving means for rotating the inner frame in a three-dimensional direction with respect to the outer frame with the center of the spherical bearing as the center.

In the bending apparatus for strip material according to [Claim 7] or [Claim 8],
The bending-side support mechanism has an L-shaped bending-side support bracket, and is formed so that the bending-side support bracket is brought into contact with and separated from the strip by driving of the driving means. Bending of the strip material characterized in that each roller is rotatably provided on two sides, and each roller is in contact with the surface of the strip material to support the strip material so as to be movable with respect to the inner frame. Processing equipment.

In the bending apparatus for any one of the strips described in [Claim 7] or [Claim 8],
The bending-side support mechanism has an L-shaped bending-side support bracket, and is formed so that the bending-side support bracket is brought into contact with and separated from the strip by driving of the driving means. Rollers are provided on the two sides so as to be rotatable, and each roller abuts on the surface of the strip material so that the strip material is movably supported with respect to the inner frame. The both ends of the L-shaped side of the bending-side support bracket that is separated from the strip by the driving of the rod are in contact with the inner peripheral surface of the inner frame so that the position of the bending-side support bracket is regulated. Material bending machine.

In the bending apparatus for any one of the strips described in [Claim 1] to [Claim 10],
A strip bending apparatus characterized in that the heating source is formed of a high-frequency heating coil arranged to inductively heat the strip in the vicinity of the center of the spherical bearing.