JP2004268116A

JP2004268116A - Method of bending taper tube and apparatus therefor

Info

Publication number: JP2004268116A
Application number: JP2003065069A
Authority: JP
Inventors: Akira Maki; 彬牧
Original assignee: Nippon Tubular Products Co Ltd
Current assignee: Nippon Steel Precision Machining Co Ltd
Priority date: 2003-03-11
Filing date: 2003-03-11
Publication date: 2004-09-30
Anticipated expiration: 2023-03-11
Also published as: JP4236960B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for bending a taper tube, which has no need to prepare many molds with various curvatures required for the taper tube, and no worry about generating scratches on the tube, and to provide a compact apparatus for bending the taper tube at low cost with good processability. <P>SOLUTION: The bending means 21 is set on a truck 20 which can move flexibly on a floor surface 13, and has a pair of reactive force receivers 25, 26 and a plurality of split type bending molds 27 which are arranged opposite to these receivers and can be changed. The split type bending mold 27 has a groove cross section with a curvature defined by the tube diameter of the taper part 11, and the bending curvature of the tube is decided according to the curvature of the cross section. The base side of the tube 12 is fixed on the floor surface 13 by using of the bending means 21, and the truck 20 is arranged to place the bending means 21 at the bending starting position, and the bending position is moved in order and the split type bending mold 27 is changed according to the bending position, and the floor position of the tip part of the tube 12 is determined and the pushing stroke and/or force of the split type bending mold 27 is controlled to bend the taper part 11 for the prescribed shape. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、道路用の照明灯を取付けるために用いる照明柱の先部に形成されたテーパー部を所定の形状に曲げるために用いるテーパー管の曲げ方法及びその装置に関する。
【０００２】
【従来の技術】
従来、道路用の照明灯を先部に取付けるために用いる照明柱となるテーパー管の先部を曲げる装置として、以下のものが知られている。
基台上に回動自在に軸支されたターンテーブルと、ターンテーブルに固定され、ターンテーブルの外側に向けて管を曲げるための成形面を備えた曲げ金型と、基台上の曲げ金型の成形面に対向する位置に設けられ管の先部を摺動自在に案内する案内部材とを有し、曲げ金型の成形面に沿わせてターンテーブルの回動側の端部に管の先端を固定し、回動駆動手段を用いてターンテーブルを回動するようになっている（例えば、特許文献１参照。）。
また、テーパー管を所定の形状に折り曲げるための曲げ金型と、曲げ金型に添設されテーパー管を回動ベースにより曲げ金型に沿って加圧しつつ回動するロールガイドとを備え、ロールガイドに形成された凹溝曲面がテーパー管における複数位置の外径部曲面と適合する曲率の異なる複数個の部分的曲面の合成された放物線状曲面により形成されているものもある（例えば、特許文献２参照。）。
なお、３点曲げ方式のロールベンダーが知られており、外径が一定の管には用いられているが、先端に向かって徐々に縮径するテーパー部を先部に有するテーパー管には使用されていない。
【０００３】
【特許文献１】
特許第３０１２８２９号明細書（第４、５頁、図１、図３）
【特許文献２】
特開２００１−４７１４１公報（第１頁、図１、図２）
【０００４】
【発明が解決しようとする課題】
しかしながら、特許文献１及び２の曲げ装置においては、未だ解決すべき以下のような問題があった。
両者とも管の曲げに際して、曲げの全域をカバーする曲げ金型を用いているので、装置が大型化し、製作費や設備費がアップするという問題があった。しかも、テーパー管の場合、肉厚のバラツキ等による成形曲率のバラツキを修正するためには、曲げ金型を交換する必要が有り、これによりコスト高となった。
また、管に要求されるさまざまな曲率に対応する曲率を有する曲げ金型を用意する必要があるので、この面でもコスト高となった。
さらに、曲げ過ぎた場合には、管を一旦、装置から取り外して、別の装置により逆方向の曲げ（曲げ戻し）により曲げ修正（矯正）を行う必要があり、段取り工数が多くなった。
また、装置本体が固定式のため、装置本体に対する管の位置ずれが発生すると、曲げ金型の片当たりが発生し、この結果、管に傷が発生するという問題もあった。
【０００５】
本発明はこのような事情に鑑みてなされたもので、テーパー管に要求されるさまざまな曲率に対応する曲率を有する多くの金型を用意する必要がなく、管に傷が発生する心配もなく、また、コンパクトで安価にでき、しかも作業性が向上するテーパー管の曲げ方法及びその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】
前記目的に沿う本発明に係るテーパー管の曲げ方法は、先端に向かって徐々に縮径するテーパー部を有する管のテーパー部を所定の形状に曲げる方法であって、床面上を自在に移動可能な車輪付きの台車に搭載され、一対の反力受け座及び一対の反力受け座の中間部に対向して配置され、当接するテーパー部の管径に応じて溝断面曲率が決められ、かつ当接するテーパー部の曲率に応じて曲げ曲率が決定され、しかも、交換可能な複数の分割型曲げ金型を備えた３点曲げ方式の曲げ手段を用い、管の基側を床面に固定し、管のテーパー部の曲げ開始位置に曲げ手段が位置するように台車を配置し、テーパー部の曲げ開始位置から先端付近までの曲げ位置は、間隔を開けて順次ずらし（順次位置を移動又は変えて）、しかも、曲げ位置に応じて適正な分割型曲げ金型に交換し、更に、各曲げ位置にて、管の先端部の床面位置を確認しながら、分割型曲げ金型の押し込みストローク及び／又は押し込み力を制御してテーパー部を所定の形状に曲げるように構成されている。これによって、従来のような曲げの全域をカバーする曲げ金型を用いることなく、複数に分割された小さい分割型曲げ金型を用いることができる。また、従来のようなテーパー部に要求されるさまざまな曲率に対応する曲率を有する曲げ金型を用意する必要がなく、複数の分割型曲げ金型を交換し、しかも、分割型曲げ金型の押し込みストロークもしくは押し込み力、又はその両方を制御してテーパー部を所定の形状に曲げることができる。さらに、曲げ手段が車輪付きの台車に搭載されているので、曲げ手段によるテーパー部の曲げに追随して、台車が移動することができる。
【０００７】
本発明に係るテーパー管の曲げ方法において、テーパー部に曲げ過ぎが生じた場合には、曲げ過ぎたテーパー部を曲げた位置で曲げ戻すこともできる。これによって、従来のように、曲げ戻しを実施するために、管を一旦、装置から取り外して、別の装置により行う必要がなく、管をそのままの位置で曲げ戻しできる。
本発明に係るテーパー管の曲げ方法において、台車は、曲げ手段及び曲げ戻し可能な３点曲げ方式の矯正手段の一対の反力受け座を搭載し、かつ矯正手段の矯正金型を配置可能な主台車と、矯正金型の駆動機構を搭載し、かつ主台車に取り外し可能で自在に移動可能な補助台車とに分離されて構成することもできる。これによって、台車をコンパクトにでき、台車の取扱いが簡略化される。
【０００８】
前記目的に沿う本発明に係るテーパー管の曲げ装置は、先端に向かって徐々に縮径するテーパー部を有する管のテーパー部を所定の形状に曲げる装置であって、管の基側を床面に固定するパイプ固定手段と、床面上を自在に移動可能な車輪付きの台車と、台車に搭載され、一対の反力受け座及び一対の反力受け座の中間部に対向して配置され、当接するテーパー部の管径に応じて溝断面曲率が決められ、かつ当接するテーパー部の曲率に応じて曲げ曲率が決定され、しかも、交換可能な複数の分割型曲げ金型を備えた３点曲げ方式の曲げ手段とを有する。これによって、パイプ固定手段により基側が床面に固定された管のテーパー部を、床面上を自在に移動可能な車輪付きの台車に搭載された曲げ手段の複数の分割型曲げ金型を交換して所定の形状に曲げることができる。しかも、曲げ手段が車輪付きの台車に搭載されているので、台車上の曲げ手段がテーパー部の曲げに追随して、移動することができる。
【０００９】
本発明に係るテーパー管の曲げ装置において、台車は、曲げ手段及び曲げ戻し可能な３点曲げ方式の矯正手段の一対の反力受け座を搭載し、かつ矯正手段の矯正金型を配置可能な主台車と、矯正金型の駆動機構を搭載し、かつ主台車に取り外し可能で自在に移動可能な補助台車とに分離されて構成することもできる。これによって、台車をコンパクトにでき、台車の取扱いが簡略化される。
【００１０】
【発明の実施の形態】
続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。
ここに、図１は本発明の一実施の形態に係るテーパー管の曲げ装置の配置図、図２は同テーパー管の曲げ装置の主台車、補助台車、曲げ手段及び矯正手段の構成図、図３は同テーパー管の曲げ装置の曲げ手段による曲げ成形時の説明図、図４は同テーパー管の曲げ装置の矯正手段による矯正時の説明図、図５は本発明の一実施の形態に係るテーパー管の曲げ方法における管のテーパー部の曲げ形状と交換可能な分割型曲げ金型との関係を示す説明図である。
【００１１】
図１及び図２に示すように、本発明の一実施の形態に係るテーパー管の曲げ装置１０は、先端に向かって徐々に縮径するテーパー部１１を先部に有する管の一例であるテーパー管１２のテーパー部１１を所定の形状に曲げる装置である。テーパー管の曲げ装置１０は、テーパー管１２の基側を床面１３に固定する複数（本実施の形態では４個）のパイプ固定金具１４〜１７からなるパイプ固定手段と、床面１３上を自在に移動可能な車輪付きの主台車１８及び主台車１８に取り外し可能に連結される補助台車１９からなる台車２０と、主台車１８に搭載された３点曲げ方式の曲げ手段２１と、主台車１８及び補助台車１９に搭載された３点曲げ方式の矯正手段２２とを備えている。以下、これらについて詳しく説明する。なお、図２において、台車２０は主台車１８から補助台車１９を取り外した状態を示しており、一方、図３及び図４では、主台車１８と補助台車１９とを連結した状態を示している。また、テーパー管１２のテーパー部１１の曲げ形状は、図５に模式的に示す通りである。
【００１２】
テーパー管１２の長さＬは９〜１６ｍ程度、基端の管径Ｋは１６７〜２３３ｍｍ程度、テーパーは（１／１００）程度であり、曲げ手段２１によりテーパー部１１（長さＴ＝２．２〜３．４ｍ程度）が所定の形状に曲げられ、先部が曲げられたテーパー管１２は、例えば、高速道路の端にその基端部が取付けられ、その先端部に照明灯が取付けられるようになっている。なお、テーパー管１２のテーパー部１１の曲げ開始位置Ｍにおける管径ｋは９７〜１０９ｍｍ程度（本実施の形態では１０３．５ｍｍ）である。
テーパー管１２の基側を床面１３に固定するパイプ固定手段を構成するパイプ固定金具１４〜１７は、それぞれ所定の間隔を開けて床面１３に配置された回転ローラ１４ａ〜１７ａ及び押さえ金具（図示せず）を有しており、先ずテーパー管１２を回転ローラ１４ａ〜１７ａに載置し、次に、テーパー管１２を人手により押して回転ローラ１４ａ〜１７ａの回転によりテーパー管１２が搬送され、位置決めされた後、前記押さえ金具で固定できるように構成されている。
【００１３】
パイプ固定金具１４〜１７の各回転ローラ１４ａ〜１７ａは、床面１３に固定された取付ブラケット（図示せず）に回転支持され、中央部がＶ字状に窪んだ鼓形の形状に形成されており、一方、各回転ローラ１４ａ〜１７ａに対応する押さえ金具は、テーパー管１２の上外周面の一部が当接するように逆Ｖ字状の断面が形成され、前記取付ブラケットにねじ締結により着脱可能に取付けられる。これにより、パイプ固定金具１４〜１７は、テーパー管１２の種々の長さＬ、管径Ｋ、ｋに対応できる構造となっている。
【００１４】
図２〜図４に示すように、主台車１８は平面視して矩形状で厚肉の板材からなる台車フレーム２３と、台車フレーム２３の下面の４隅部にそれぞれ床面１３上で水平面に回転自在の車輪２４とを備えている。なお、主台車１８及び補助台車１９が、曲げ反力及び曲げ戻し反力により可動する床面１３の領域には、主台車１８及び補助台車１９の可動がスムーズになるように、鉄板が敷き詰められている。
曲げ手段２１は、台車フレーム２３の前側に搭載され、幅方向に間隔を開けて配置された一対の反力受け座２５、２６と、一対の反力受け座２５、２６間の中間部に反力受け座２５、２６に対向して配置される交換可能な複数の分割型曲げ金型２７（本実施の形態では、図５に示すように、５つの分割型曲げ金型を備えており、それぞれ２７ａ〜２７ｅで示す）とを備えている。
【００１５】
図５ではテーパー部１１の形状に沿って長さが目盛られ、しかも曲げ位置及び曲げ順番をＮ（Ｎ＝１〜２７）で示している。そして曲げ位置及び曲げ順番Ｎに対応して、各分割型曲げ金型２７ａ〜２７ｅの適用範囲が示されている。即ち、太線で示す５つの分割型曲げ金型２７ａ〜２７ｅの位置は、それぞれの分割型曲げ金型２７ａ〜２７ｅの曲げ開始位置（交換位置）を表しており、細線で示す５つの分割型曲げ金型２７ａ〜２７ｅの位置は、それぞれの分割型曲げ金型２７ａ〜２７ｅの曲げ終了位置を表している。
【００１６】
図５に示すように、分割型曲げ金型２７ａでは、Ｎ＝１〜５、分割型曲げ金型２７ｂでは、Ｎ＝６〜９、分割型曲げ金型２７ｃでは、Ｎ＝１０〜１４、分割型曲げ金型２７ｄでは、Ｎ＝１５〜２１、分割型曲げ金型２７ｅでは、Ｎ＝２２〜２７をカバーするようになっている。このように、テーパー部１１の基側に近い曲率の大きいＮ＝１〜１８では、５０ｍｍのピッチで曲げ位置をずらせて曲げを行い、それ以降の曲率の小さいＮ＝１９〜２７では、１５０ｍｍの大きい（３倍の）ピッチで曲げ位置をずらして曲げを行っている。
【００１７】
それぞれの分割型曲げ金型２７ａ〜２７ｅの曲げ開始位置（分割型曲げ金型２７ａではＮ＝１、分割型曲げ金型２７ｂではＮ＝６、分割型曲げ金型２７ｃではＮ＝１０、分割型曲げ金型２７ｄではＮ＝１５、分割型曲げ金型２７ｅではＮ＝２２）において、分割型曲げ金型２７ａ〜２７ｅの基端位置でのテーパー部１１の管径Ｄはそれぞれ、１０３．５、１０１、９９、９６、８９ｍｍとなっている。ここで、分割型曲げ金型２７ａ〜２７ｅの曲げ曲率半径ｒ_ａ、ｒ_ｂ、ｒ_ｃ、ｒ_ｄ、ｒ_ｅはそれぞれ、管径Ｄ＝１０３．５、１０１、９９、９６、８９ｍｍの位置でのテーパー部１１の曲率半径Ｒより若干小さめとしており、曲げ曲率半径ｒ_ａ、ｒ_ｂ、ｒ_ｃ、ｒ_ｄ、ｒ_ｅはそれぞれ、６４０、８４０、１２４０、１７５０、２２５０ｍｍとしている。
一方、分割型曲げ金型２７ａ〜２７ｅの溝断面の曲率半径（図２に拡大図で示すように、曲率半径はｔ）はそれぞれ、分割型曲げ金型２７ａ〜２７ｅの基端位置において、管径Ｄ＝１０３．５、１０１、９９、９６、８９ｍｍに対して管径のばらつきを許容する為に若干大きめに形成されており、しかも、先端位置に沿ってテーパー部１１のテーパー（１／１００）に一致して形成されている。
【００１８】
かかる構成によって、テーパー部１１の形状及び管径Ｄに応じて、分割型曲げ金型２７ａ〜２７ｅを順次交換して、テーパー部１１の長さ方向に沿って所定の間隔を開けて、テーパー部１１を曲げ開始位置（Ｎ＝１に相当）から先端付近の曲げ終了位置（Ｎ＝２７に相当）まで移動させながら、テーパー部１１を反力受け座２５、２６と分割型曲げ金型２７ａ〜２７ｅに挟んだ状態で分割型曲げ金型２７ａ〜２７ｅを反力受け座２５、２６側に押し込むことにより、３点曲げ方式でテーパー部１１を所定の形状に曲げることができる。
【００１９】
図２〜図４に示すように、分割型曲げ金型２７の後側の上端部には矩形板状の着脱部２８が形成されており、着脱部２８を介して分割型曲げ金型２７は矩形ブロック状の金型取付金具２９に交換可能に設けられている。金型取付金具２９の後端部は、台車フレーム２３上の後端部に取付けられた軸受ブラケット３０に垂直に配置されたピン３１を介して設けられた油圧シリンダー３２のロッド３３に連結されている。
【００２０】
図３及び図４に示すように、油圧シリンダー３２の駆動により台車フレーム２３の長手方向に沿って進退する金型取付金具２９の幅方向の両側面にそれぞれ当接して、金型取付金具２９の進退をガイドする３個のガイドローラ２９ａ、２９ｂが台車フレーム２３上に設けられている。なお、金型取付金具２９はロッド３３が縮小時（分割型曲げ金型２７の後退位置）では、３個のガイドローラ２９ａ、２９ｂと接し、ロッド３３が伸長時（分割型曲げ金型２７の前進位置）では、前側の１個のガイドローラ２９ａ、２９ｂと接するようになっている。
【００２１】
かかる構成によって、曲げようとするテーパー部１１を反力受け座２５、２６との間に挟んで、油圧シリンダー３２の駆動により分割型曲げ金型２７を押し込んでテーパー部１１を曲げることができる。
図２〜図４に示すように、台車フレーム２３の前側の略半分を覆って高さ方向に間隔を保って矩形状の取付板３４が、４隅部にそれぞれ、台車フレーム２３との間にスリーブ状のスペーサー３５を介して、固定用ボルト３６及びナット３７により台車フレーム２３に固定されている。
【００２２】
台車フレーム２３の前端部に幅方向に間隔を開けて配置された反力受け座２５、２６はそれぞれ、上、下端部がそれぞれ、取付板３４、台車フレーム２３に取付けられた固定軸３８と、固定軸３８に回動可能な円筒状の回動部３９と、回動部３９の分割型曲げ金型２７側に取付けられ、テーパー部１１が当接する受け部４０とを備えている。受け部４０の溝断面の曲率半径は当接するテーパー部１１の管径より大きく設定され、テーパー管径のばらつきを吸収可能としている。
【００２３】
図２〜図４に示すように、反力受け座２５、２６の後側には、反力受け座２５、２６と略対向して矯正用の一対の反力受け座の一例である反力受けローラー４１、４２が、上、下軸端部がそれぞれ、取付板３４、台車フレーム２３に取付けられた固定軸４１ａ、４２ａに回転可能に設けられている。反力受けローラー４１、４２の高さ方向の中間部には、テーパー部１１の管外面が当接するＵ字状の溝が形成されている。取付板３４の中央部には、分割型曲げ金型２７を交換するため、また、テーパー部１１の曲げの状況を観察するための矩形状の開口４３が形成されている。図２に示すように、台車フレーム２３の前端部の下面には、補助台車１９と連結するため、矩形板状の接続金具４４が設けられている。
【００２４】
図２〜図４に示すように、補助台車１９は平面視して長尺矩形状で厚肉の板材からなる台車フレーム４５と、台車フレーム４５の下面の後端部（主台車１８側）に幅方向に間隔を開けて設けられた２個の車輪４６及び前端部に水平方向に回転自在に設けられた１個の車輪４７とを備えており、しかも、台車フレーム４５の後端部には、主台車１８の接続金具４４にピンにより取り外し可能な連結部４５ａが形成されている。
【００２５】
台車フレーム４５の前端部には、矯正手段２２の駆動機構を構成する油圧シリンダー４８のヘッド部４８ａが、台車フレーム４５上の前端部に取付けられた軸受ブラケット４９に垂直に配置されたピン５０を介して設けられている。油圧シリンダー４８のロッド５１にはブロック状の接続金具５２を介して、矯正金型５３が着脱可能に設けられるようになっている。なお、矯正金型５３は油圧シリンダー４８の駆動により主台車１８の台車フレーム２３上を進退するようになっている。かかる構成によって、曲げ過ぎたテーパー部１１を主台車１８から取り外すことなく、そのままの状態で、主台車１８に設けられた反力受けローラー４１、４２と、主台車１８に連結された補助台車１９に設けた油圧シリンダー４８の駆動により矯正金型５３との間に挟んで、矯正金型５３の押し込みにより曲がりを矯正することができる。
【００２６】
次いで、テーパー管の曲げ装置１０を用いた本発明の一実施の形態に係るテーパー管の曲げ方法について、図を参照しながら説明する。
（１）予め、主台車１８には、最初に使用する分割型曲げ金型２７ａがセットされており、分割型曲げ金型２７ａは油圧シリンダー３２により後退位置にあるものとする。また、各曲げ位置（図５のＮで示す）において、テーパー部１１の曲げに基づいて変位するテーパー管１２の先端位置Ｓを、床面１３上に予め罫書いておく。
【００２７】
（２）図１に示すように、先部にテーパー部１１を有するテーパー管１２の基側を、パイプ固定手段を構成する床面１３に固定されたパイプ固定金具１４〜１７の回転ローラ１４ａ〜１７ａ上に載置し、作業者がテーパー管１２を手で搬送して位置決めした後、それぞれの回転ローラ１４ａ〜１７ａに対応する押さえ金具を介して固定する。
（３）補助台車１９が連結されていない主台車１８を、図１に示す位置（Ａ）に配置する。
【００２８】
（４）主台車１８を位置（Ａ）から、床面１３に固定されたテーパー管１２のテーパー部１１が、曲げ手段２１の反力受け座２５、２６と分割型曲げ金型２７ａとの間を挿通して、図５に示す曲げ位置及び曲げ順番数Ｎ＝１（曲げ開始位置）になるように、位置（Ｂ）に移動する。
（５）位置（Ｂ）において、図３に示すように（但し、図３において補助台車１９は連結されていない）、分割型曲げ金型２７ａを取付けた曲げ手段２１によりテーパー部１１を曲げると、テーパー部１１の曲がりに伴って主台車１８は位置（Ｃ）に移動する。この曲げの際、テーパー管１２の先端位置Ｓが、床面１３に予め罫書きされた位置と一致するように、確認しながら、同一の分割型曲げ金型２７ａにより押し込みストローク及び／又は押し込み力をコントロールする。
【００２９】
（６）以降、図５及び図３に示すように、分割型曲げ金型２７ａを使用してＮ＝２〜５、分割型曲げ金型２７ｂに交換して、Ｎ＝６〜９、分割型曲げ金型２７ｃに交換して、Ｎ＝１０〜１４、分割型曲げ金型２７ｄに交換して、Ｎ＝１５〜２１、分割型曲げ金型２７ｅに交換して、Ｎ＝２２〜２７にて、前記（５）と同じ要領にて曲げ位置を順次ずらして（図１の位置（Ｄ）参照）、部分的な曲げを繰り返して全体の曲げを行う。
【００３０】
（７）なお、各曲げ位置において、曲げ過ぎが発生した場合には、例えば、図１の位置（Ｅ）及び図４に示すように、主台車１８に補助台車１９を連結し、曲げ手段２１の分割型曲げ金型２７ｅを後退位置に退避させた状態で、矯正手段２２を使用して曲げ過ぎたテーパー部１１をその曲げた位置で曲げ戻して修正する。（８）テーパー部１１が曲げられたテーパー管１２の全高、出幅が所定の基準内にあることを確認した後、テーパー管１２をパイプ固定手段及び主台車１８から取り外し、照明灯を取付けるためのアダプターを取付ける。
【００３１】
本発明は前記した実施の形態に限定されるものではなく、本発明の要旨を変更しない範囲での変更は可能であり、例えば、前記したそれぞれの実施の形態や変形例の一部又は全部を組み合わせて本発明のテーパー管の曲げ方法及びその装置を構成する場合も本発明の権利範囲に含まれる。
前記実施の形態においては、テーパー部１１に曲げ過ぎが生じた場合には、矯正手段２２を用いて、曲げ過ぎたテーパー部１１を曲げた位置で曲げ戻すように構成したが、これに限定されず、必要に応じて、矯正手段を省略することもできる。即ち、補助台車１９、補助台車１９に搭載された油圧シリンダー４８等、及び主台車１８に搭載された反力受けローラー４１、４２を省略することもできる。
【００３２】
台車２０は、曲げ手段２１及び矯正手段２２の一対の反力受けローラー４１、４２を搭載し、かつ矯正手段２２の矯正金型５３を配置可能で自在に移動可能な主台車１８と、矯正金型５３の駆動機構を搭載し、かつ主台車１８に取り外し可能で自在に移動可能な補助台車１９とに分離したが、これに限定されず、必要に応じて、主台車と補助台車とを一体的に構成し、一体構造の台車に曲げ手段及び矯正手段を搭載することもできる。
交換可能な分割型曲げ金型２７を５個設けたが、これに限定されず、テーパー部の長さ、形状、管径、材質（強度）等を考慮して、２〜４個、又は６個以上設けることもできる。
【００３３】
パイプ固定手段のパイプ固定金具１４〜１７に回転ローラ１４ａ〜１７ａを用いたが、これに限定されず、テーパー管１１の基側を位置決めして、固定できる構造であれば、その他の構造のパイプ固定手段でも構わない。また、４個のパイプ固定金具１４〜１７を設けたが、これに限定されず、１〜３個又は５個以上のパイプ固定金具を用いてもよい。
テーパー管１２を使用したが、これに限定されず、テーパー部がテーパー状に形成されていれば、曲げ加工を施さない基部は平行管であっても構わない。
【００３４】
【発明の効果】
請求項１〜３記載のテーパー管の曲げ方法においては、従来のような曲げの全域をカバーする曲げ金型を用いることなく、複数に分割された小さい分割型曲げ金型を用いることができるので、装置をコンパクトにできる。また、従来のようなテーパー部に要求されるさまざまな曲率に対応する曲率を有する曲げ金型を用意する必要がなく、複数の分割型曲げ金型を交換し、しかも、分割型曲げ金型の押し込みストロークもしくは押し込み力、又は押し込みストローク及び押し込み力を制御してテーパー部を所定の形状に曲げることができるので、曲げ金型を含む装置のコストを大幅に軽減できる。さらに、曲げ手段が車輪付きの台車に搭載されているので、曲げ手段によるテーパー部の曲げに追随して、台車が移動することができるため、これにより、従来の固定式に比べて、管に傷が付くことが解消され、高品質な曲げ加工ができる。
【００３５】
特に、請求項２記載のテーパー管の曲げ方法においては、従来のように、曲げ戻しを実施するために、管を一旦、装置から取り外して、別の装置により行う必要がなく（管を抜き差しする必要がなく）、そのままの位置で曲げ戻しできるので、矯正作業の作業性が向上すると共に、矯正手段を安価に製作できる。
請求項３記載のテーパー管の曲げ方法においては、台車をコンパクトにでき、台車の取扱いが簡略化されるので、曲げ作業の作業性が向上する。
【００３６】
請求項４及び５記載のテーパー管の曲げ装置においては、パイプ固定手段により基側が床面に固定された管のテーパー部を、床面上を自在に移動可能な車輪付きの台車に搭載された曲げ手段の複数の分割型曲げ金型を交換して所定の形状に曲げることができるので、装置をコンパクトにでき、これにより、廉価な装置にできる。しかも、曲げ手段が車輪付きの台車に搭載されているので、台車上の曲げ手段がテーパー部の曲げに追随して、移動することができ、これにより、従来の固定式に比べて、管に傷が付くことが解消され、高品質な曲げ加工ができる。
特に、請求項５記載のテーパー管の曲げ装置においては、台車をコンパクトにでき、台車の取扱いが簡略化されるので、曲げ作業の作業性が向上する。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係るテーパー管の曲げ装置の配置図である。
【図２】同テーパー管の曲げ装置の主台車、補助台車、曲げ手段及び矯正手段の構成図である。
【図３】同テーパー管の曲げ装置の曲げ手段による曲げ成形時の説明図である。
【図４】同テーパー管の曲げ装置の矯正手段による矯正時の説明図である。
【図５】本発明の一実施の形態に係るテーパー管の曲げ方法における管のテーパー部の曲げ形状と交換可能な分割型曲げ金型との関係を示す説明図である。
【符号の説明】
１０：テーパー管の曲げ装置、１１：テーパー部、１２：テーパー管（管）、１３：床面、１４：パイプ固定金具、１４ａ：回転ローラ、１５：パイプ固定金具、１５ａ：回転ローラ、１６：パイプ固定金具、１６ａ：回転ローラ、１７：パイプ固定金具、１７ａ：回転ローラ、１８：主台車、１９：補助台車、２０：台車、２１：曲げ手段、２２：矯正手段、２３：台車フレーム、２４：車輪、２５、２６：反力受け座、２７、２７ａ〜２７ｅ：分割型曲げ金型、２８：着脱部、２９：金型取付金具、２９ａ、２９ｂ：ガイドローラ、３０：軸受ブラケット、３１：ピン、３２：油圧シリンダー、３３：ロッド、３４：取付板、３５：スペーサー、３６：固定用ボルト、３７：ナット、３８：固定軸、３９：回動部、４０：受け部、４１：反力受けローラー（反力受け座）、４１ａ：固定軸、４２：反力受けローラー（反力受け座）、４２ａ：固定軸、４３：開口、４４：接続金具、４５：台車フレーム、４５ａ：連結部、４６：車輪、４７：車輪、４８：油圧シリンダー、４８ａ：ヘッド部、４９：軸受ブラケット、５０：ピン、５１：ロッド、５２：接続金具、５３：矯正金型[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for bending a tapered tube used to bend a tapered portion formed at the tip of a lighting pole used for mounting a road lamp into a predetermined shape.
[0002]
[Prior art]
DESCRIPTION OF RELATED ART Conventionally, the following is known as an apparatus which bends the front-end | tip of the taper tube used as a lighting pillar used for attaching a road lamp to the front-end.
A turntable pivotally supported on a base, a bending die fixed to the turntable and having a forming surface for bending a tube toward the outside of the turntable, and a bending die on the base A guide member provided at a position facing the molding surface of the mold to slidably guide the tip of the tube. Is fixed, and the turntable is rotated using a rotation driving means (for example, see Patent Document 1).
Further, a bending die for bending the tapered tube into a predetermined shape, and a roll guide attached to the bending die and rotating while pressing the tapered tube along the bending die by the rotation base with the turning base, In some cases, the concave groove curved surface formed in the guide is formed by a parabolic curved surface obtained by combining a plurality of partial curved surfaces having different curvatures matching the outer diameter portion curved surfaces at a plurality of positions in the tapered tube (for example, see Patent Reference 2).
A three-point bending type roll bender is known, and is used for a pipe having a constant outer diameter, but is used for a tapered pipe having a tapered portion having a tapered portion which gradually decreases in diameter toward the front end. It has not been.
[0003]
[Patent Document 1]
Patent No. 3012829 (4th and 5th pages, FIGS. 1 and 3)
[Patent Document 2]
JP 2001-47141 A (Page 1, FIGS. 1 and 2)
[0004]
[Problems to be solved by the invention]
However, the bending apparatuses of Patent Documents 1 and 2 have the following problems to be solved.
In both cases, when bending a pipe, a bending die is used to cover the entire area of the bending, so that there is a problem that the apparatus becomes large, and the production cost and equipment cost increase. In addition, in the case of a tapered tube, it is necessary to replace a bending mold in order to correct a variation in a molding curvature due to a variation in a wall thickness or the like, thereby increasing costs.
Further, since it is necessary to prepare a bending mold having a curvature corresponding to various curvatures required for the pipe, the cost is increased in this aspect as well.
Further, when the pipe is excessively bent, it is necessary to remove the pipe from the apparatus once and to perform bending correction (correction) by bending (returning) in the opposite direction by another apparatus, which increases the number of setup steps.
In addition, since the apparatus main body is fixed, if the pipe is displaced with respect to the apparatus main body, one end of the bending mold occurs, and as a result, there is a problem that the pipe is damaged.
[0005]
The present invention has been made in view of such circumstances, and it is not necessary to prepare many molds having curvatures corresponding to various curvatures required for the tapered tube, and there is no fear that the tube will be damaged. It is another object of the present invention to provide a method and apparatus for bending a tapered tube which can be made compact, inexpensive, and have improved workability.
[0006]
[Means for Solving the Problems]
A method of bending a tapered pipe according to the present invention, which meets the above object, is a method of bending a tapered part of a pipe having a tapered part whose diameter is gradually reduced toward a tip into a predetermined shape, and freely moves on a floor surface. It is mounted on a bogie with possible wheels, is arranged opposite to a pair of reaction force receiving seats and an intermediate portion between the pair of reaction force receiving seats, and the groove cross-sectional curvature is determined according to the pipe diameter of the tapered portion that abuts, In addition, the bending curvature is determined according to the curvature of the tapered portion to be abutted, and the base side of the pipe is fixed to the floor surface using a three-point bending method including a plurality of exchangeable divided bending dies. Then, the bogie is arranged so that the bending means is positioned at the bending start position of the tapered portion of the pipe, and the bending positions from the bending start position of the tapered portion to the vicinity of the tip are sequentially shifted at intervals (moving the sequential position or Change), and according to the bending position Change the bending die to the correct one, and check the floor position at the tip of the pipe at each bending position, while controlling the pressing stroke and / or the pressing force of the split bending die to form a taper. The portion is configured to bend into a predetermined shape. This makes it possible to use a small divided bending mold that is divided into a plurality of parts without using a bending mold that covers the entire bending area as in the related art. In addition, there is no need to prepare a bending mold having a curvature corresponding to various curvatures required for the tapered portion as in the related art, and it is possible to exchange a plurality of split bending dies, and furthermore, to use the split bending dies. By controlling the pushing stroke or pushing force, or both, the tapered portion can be bent into a predetermined shape. Furthermore, since the bending means is mounted on the bogie with wheels, the bogie can move following the bending of the tapered portion by the bending means.
[0007]
In the method for bending a tapered pipe according to the present invention, if the tapered portion is excessively bent, the excessively bent tapered portion can be bent back at the bent position. As a result, it is not necessary to remove the pipe from the apparatus once and perform the bending with another apparatus in order to perform the bending back as in the related art, and the pipe can be bent back in the same position.
In the method for bending a tapered pipe according to the present invention, the bogie is equipped with a pair of reaction force receiving seats of a bending unit and a three-point bending type straightening unit that can be bent back, and a straightening die of the straightening unit can be arranged. It is also possible to adopt a configuration in which the main bogie and an auxiliary bogie that has a drive mechanism for the correction mold mounted thereon and that is detachable from the main bogie and that can move freely are separated. Thereby, the truck can be made compact and handling of the truck is simplified.
[0008]
A taper pipe bending apparatus according to the present invention, which meets the above object, is an apparatus for bending a tapered portion of a pipe having a tapered portion whose diameter is gradually reduced toward a distal end into a predetermined shape, wherein the base side of the pipe is a floor surface. Pipe fixing means, a truck with wheels that can freely move on the floor surface, and mounted on the truck, and arranged opposite to a pair of reaction force receiving seats and an intermediate portion between the pair of reaction force receiving seats. The groove cross-section curvature is determined according to the pipe diameter of the abutting tapered portion, and the bending curvature is determined according to the curvature of the abutting tapered portion. Point bending type bending means. Thereby, the tapered portion of the pipe whose base side is fixed to the floor surface by the pipe fixing means is replaced with a plurality of divided bending dies of the bending means mounted on a bogie with wheels that can freely move on the floor surface. To be bent into a predetermined shape. Moreover, since the bending means is mounted on the bogie with wheels, the bending means on the bogie can move following the bending of the tapered portion.
[0009]
In the taper pipe bending apparatus according to the present invention, the bogie is equipped with a pair of reaction force receiving seats of a bending means and a three-point bending type correcting means capable of bending back, and a correction mold of the correcting means can be arranged. It is also possible to adopt a configuration in which the main bogie and an auxiliary bogie that has a drive mechanism for the correction mold mounted thereon and that is detachable from the main bogie and that can move freely are separated. Thereby, the truck can be made compact and handling of the truck is simplified.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
Here, FIG. 1 is a layout view of a taper pipe bending apparatus according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a main bogie, an auxiliary bogie, a bending means, and a straightening means of the taper pipe bending apparatus. 3 is an explanatory view of the taper pipe bending apparatus at the time of bending by the bending means, FIG. 4 is an explanatory view of the taper pipe bending apparatus at the time of correction by the correction means, and FIG. 5 is an embodiment of the present invention. It is explanatory drawing which shows the relationship between the bending shape of the taper part of a pipe | tube in the method of bending a taper pipe | tube, and a split type bending mold which can be replaced.
[0011]
As shown in FIGS. 1 and 2, a taper pipe bending apparatus 10 according to an embodiment of the present invention is an example of a pipe having a tapered portion 11 having a tapered portion 11 whose diameter gradually decreases toward the tip. This is a device for bending the tapered portion 11 of the tube 12 into a predetermined shape. The taper pipe bending apparatus 10 includes a pipe fixing means including a plurality of (four in the present embodiment) pipe fixing fittings 14 to 17 for fixing the base side of the taper pipe 12 to the floor 13, and A bogie 20 including a main bogie 18 with wheels that can move freely and an auxiliary bogie 19 detachably connected to the main bogie 18; a three-point bending type bending means 21 mounted on the main bogie 18; And a three-point bending type correction means 22 mounted on the auxiliary carriage 18. Hereinafter, these will be described in detail. Note that, in FIG. 2, the bogie 20 shows a state where the auxiliary bogie 19 is removed from the main bogie 18, while FIGS. 3 and 4 show a state where the main bogie 18 and the auxiliary bogie 19 are connected. . The bent shape of the tapered portion 11 of the tapered tube 12 is as schematically shown in FIG.
[0012]
The length L of the tapered tube 12 is about 9 to 16 m, the diameter K of the base end is about 167 to 233 mm, the taper is about (1/100), and the taper portion 11 (length T = 2. For example, the tapered tube 12 having a bent end portion is attached to the end of the highway, and the illumination lamp is attached to the tip end. It has become. The pipe diameter k at the bending start position M of the tapered portion 11 of the tapered pipe 12 is about 97 to 109 mm (103.5 mm in the present embodiment).
Pipe fixing metal fittings 14 to 17 constituting pipe fixing means for fixing the base side of the tapered pipe 12 to the floor surface 13 include rotating rollers 14 a to 17 a and holding metal fittings ( (Not shown), the tapered tube 12 is first placed on the rotating rollers 14a to 17a, and then the tapered tube 12 is manually pushed to rotate the rotating rollers 14a to 17a, whereby the tapered tube 12 is conveyed. After being positioned, it is configured so that it can be fixed by the holding metal.
[0013]
Each of the rotating rollers 14a to 17a of the pipe fixing members 14 to 17 is rotatably supported by a mounting bracket (not shown) fixed to the floor surface 13, and is formed in a drum-shaped shape having a V-shaped central portion. On the other hand, the holding metal fitting corresponding to each of the rotating rollers 14a to 17a has an inverted V-shaped cross-section formed so that a part of the upper and outer peripheral surfaces of the tapered tube 12 abuts, and is screwed to the mounting bracket. Removably attached. Thereby, the pipe fixing fittings 14 to 17 have a structure that can correspond to various lengths L and pipe diameters K and k of the tapered pipe 12.
[0014]
As shown in FIGS. 2 to 4, the main bogie 18 has a bogie frame 23 made of a thick plate having a rectangular shape in plan view, and four corners on the lower surface of the bogie frame 23, each having a horizontal surface on the floor 13. And a rotatable wheel 24. In addition, in the area of the floor surface 13 where the main bogie 18 and the auxiliary bogie 19 can move due to the bending reaction force and the bending back reaction force, iron plates are laid so that the main bogie 18 and the auxiliary bogie 19 can move smoothly. ing.
The bending means 21 is mounted on the front side of the bogie frame 23, and has a pair of reaction force receiving seats 25 and 26 spaced apart in the width direction and a middle portion between the pair of reaction force receiving seats 25 and 26. A plurality of replaceable split bending dies 27 arranged opposite to the force receiving seats 25 and 26 (in the present embodiment, five split bending dies are provided as shown in FIG. 27a to 27e).
[0015]
In FIG. 5, the length is graduated along the shape of the tapered portion 11, and the bending position and the bending order are indicated by N (N = 1 to 27). The applicable range of each of the split-type bending dies 27a to 27e is shown corresponding to the bending position and the bending order N. In other words, the positions of the five split bending dies 27a to 27e indicated by thick lines represent the bending start positions (replacement positions) of the respective split bending dies 27a to 27e, and the five split bending dies indicated by thin lines. The positions of the dies 27a to 27e indicate the bending end positions of the respective split die bending dies 27a to 27e.
[0016]
As shown in FIG. 5, N = 1 to 5 for the split bending mold 27a, N = 6 to 9 for the split bending mold 27b, N = 10 to 14 for the split bending mold 27c, The bending mold 27d covers N = 15 to 21, and the split bending mold 27e covers N = 22 to 27. Thus, when N = 1 to 18 having a large curvature near the base side of the tapered portion 11, bending is performed by shifting the bending position at a pitch of 50 mm, and when N = 19 to 27 having a small curvature thereafter, 150 mm is used. Bending is performed by shifting the bending position at a large (three times) pitch.
[0017]
Bending start position of each of the split bending dies 27a to 27e (N = 1 for the split bending dies 27a, N = 6 for the split bending dies 27b, N = 10 for the split bending dies 27c, In the bending die 27d, N = 15, and in the split bending die 27e, N = 22), the pipe diameters D of the tapered portions 11 at the base positions of the split bending dies 27a to 27e are 103.5, respectively. 101, 99, 96 and 89 mm. Here, the bending radius of curvature r of the split-type bending dies 27a to 27e. _a , R _b , R _c , R _d , R _e Are slightly smaller than the radius of curvature R of the tapered portion 11 at the positions of the pipe diameters D = 103.5, 101, 99, 96, and 89 mm, respectively. _a , R _b , R _c , R _d , R _e Are 640, 840, 1240, 1750, and 2250 mm, respectively.
On the other hand, the radius of curvature (the radius of curvature is t as shown in the enlarged view in FIG. 2) of the groove cross section of each of the split bending dies 27a to 27e is equal to the pipe radius at the base end position of each of the split bending dies 27a to 27e. The diameter D is 103.5, 101, 99, 96, and 89 mm. The diameter D is slightly larger in order to allow variation in the pipe diameter, and the taper of the tapered portion 11 along the distal end position (1/100). ).
[0018]
With such a configuration, the divided bending dies 27a to 27e are sequentially exchanged in accordance with the shape of the tapered portion 11 and the pipe diameter D, and a predetermined interval is provided along the length direction of the tapered portion 11 to form the tapered portion. 11 is moved from the bending start position (corresponding to N = 1) to the bending end position near the tip (corresponding to N = 27), and the tapered portion 11 is moved to the reaction force receiving seats 25 and 26 and the split bending dies 27a to The tapered portion 11 can be bent into a predetermined shape by a three-point bending method by pushing the split-type bending dies 27a to 27e toward the reaction force receiving seats 25 and 26 while being sandwiched between the 27e.
[0019]
As shown in FIGS. 2 to 4, a rectangular plate-shaped attaching / detaching portion 28 is formed at the upper end on the rear side of the split-type bending mold 27. It is replaceably provided on a rectangular block-shaped mold mounting bracket 29. The rear end of the mold mounting bracket 29 is connected to a rod 33 of a hydraulic cylinder 32 provided via a pin 31 vertically arranged on a bearing bracket 30 mounted on the rear end of the bogie frame 23. I have.
[0020]
As shown in FIG. 3 and FIG. 4, the hydraulic cylinder 32 is driven to move along the longitudinal direction of the bogie frame 23 so as to abut on both side surfaces in the width direction of the mold mounting bracket 29. Three guide rollers 29a and 29b for guiding the reciprocation are provided on the bogie frame 23. When the rod 33 is contracted (retracted position of the split bending mold 27), the mold mounting bracket 29 is in contact with the three guide rollers 29a and 29b, and when the rod 33 is extended (the split bending mold 27 is At the forward position), it is in contact with one of the front guide rollers 29a and 29b.
[0021]
With this configuration, the tapered portion 11 to be bent can be sandwiched between the reaction force receiving seats 25 and 26, and the split bending die 27 can be pushed in by driving the hydraulic cylinder 32 to bend the tapered portion 11.
As shown in FIGS. 2 to 4, rectangular mounting plates 34 covering substantially half of the front side of the bogie frame 23 and keeping an interval in the height direction are provided between the bogie frame 23 at the four corners, respectively. It is fixed to the bogie frame 23 by a fixing bolt 36 and a nut 37 via a sleeve-like spacer 35.
[0022]
The reaction force receiving seats 25 and 26 arranged at intervals in the width direction at the front end of the bogie frame 23 have upper and lower ends, respectively, a mounting plate 34 and a fixed shaft 38 mounted on the bogie frame 23, respectively. It has a cylindrical rotating part 39 that can rotate on the fixed shaft 38, and a receiving part 40 that is attached to the split-type bending mold 27 side of the rotating part 39 and that the tapered part 11 contacts. The radius of curvature of the groove cross section of the receiving portion 40 is set to be larger than the diameter of the pipe of the tapered portion 11 to be brought into contact, so that variations in the diameter of the tapered pipe can be absorbed.
[0023]
As shown in FIGS. 2 to 4, on the rear side of the reaction force receiving seats 25 and 26, a reaction force which is substantially opposed to the reaction force receiving seats 25 and 26 and is an example of a pair of correction reaction force receiving seats for correction. The receiving rollers 41 and 42 are provided rotatably on fixed shafts 41 a and 42 a attached to the mounting plate 34 and the bogie frame 23, respectively, at the upper and lower shaft ends. A U-shaped groove is formed at an intermediate portion of the reaction force receiving rollers 41 and 42 in the height direction, with which the outer surface of the pipe of the tapered portion 11 abuts. A rectangular opening 43 is formed in the center of the mounting plate 34 for exchanging the split bending mold 27 and observing the state of bending of the tapered portion 11. As shown in FIG. 2, a rectangular plate-like connection fitting 44 is provided on the lower surface of the front end portion of the bogie frame 23 to be connected to the auxiliary bogie 19.
[0024]
As shown in FIGS. 2 to 4, the auxiliary trolley 19 includes a trolley frame 45 made of a thick plate having a long rectangular shape in plan view, and a rear end (the main trolley 18 side) of a lower surface of the trolley frame 45. It comprises two wheels 46 provided at intervals in the width direction and one wheel 47 provided at the front end so as to be rotatable in the horizontal direction, and at the rear end of the bogie frame 45 A connecting portion 45a is formed on the connection fitting 44 of the main carriage 18 so as to be removable by a pin.
[0025]
At the front end of the bogie frame 45, a head portion 48a of a hydraulic cylinder 48 constituting a drive mechanism of the straightening means 22 has a pin 50 vertically arranged on a bearing bracket 49 attached to the front end of the bogie frame 45. It is provided through. A straightening mold 53 is removably provided on the rod 51 of the hydraulic cylinder 48 via a block-shaped connection fitting 52. The correction mold 53 is configured to advance and retreat on the bogie frame 23 of the main bogie 18 by driving the hydraulic cylinder 48. With this configuration, the reaction force receiving rollers 41 and 42 provided on the main bogie 18 and the auxiliary bogie 19 connected to the main bogie 18 are maintained without removing the excessively bent tapered portion 11 from the main bogie 18. The bending can be corrected by pushing the correction mold 53 by sandwiching the correction mold 53 between the correction mold 53 and the hydraulic cylinder 48 by driving the hydraulic cylinder 48 provided in the apparatus.
[0026]
Next, a method for bending a tapered pipe according to an embodiment of the present invention using the taper pipe bending apparatus 10 will be described with reference to the drawings.
(1) It is assumed that a split mold bending mold 27a to be used first is set on the main bogie 18 in advance, and the split mold bending mold 27a is in a retracted position by the hydraulic cylinder 32. Further, at each bending position (indicated by N in FIG. 5), the tip position S of the tapered tube 12 that is displaced based on the bending of the tapered portion 11 is prescribed on the floor surface 13 in advance.
[0027]
(2) As shown in FIG. 1, the base rollers of a tapered pipe 12 having a tapered portion 11 at its tip are connected to rotating rollers 14a to 14 of pipe fixing fittings 14 to 17 which are fixed to a floor 13 constituting pipe fixing means. After placing on the taper 17a, the operator manually conveys and positions the tapered tube 12, it is fixed to the respective rotary rollers 14a to 17a via holding metal fittings.
(3) The main bogie 18 to which the auxiliary bogie 19 is not connected is arranged at the position (A) shown in FIG.
[0028]
(4) The tapered portion 11 of the tapered tube 12 fixed to the floor surface 13 from the position (A) of the main bogie 18 is positioned between the reaction force receiving seats 25 and 26 of the bending means 21 and the split bending mold 27a. To the position (B) such that the bending position and the bending order number N = 1 (bending start position) shown in FIG.
(5) At the position (B), as shown in FIG. 3 (however, the auxiliary carriage 19 is not connected in FIG. 3), the taper portion 11 is bent by the bending means 21 to which the split bending die 27a is attached. The main carriage 18 moves to the position (C) with the bending of the tapered portion 11. At the time of this bending, the pushing stroke and / or the pushing force are pushed by the same split mold bending mold 27a while confirming that the tip position S of the tapered tube 12 matches the position scribed in advance on the floor surface 13. Control.
[0029]
(6) Thereafter, as shown in FIGS. 5 and 3, N = 2 to 5 using the split bending mold 27a, and replacing with the split bending mold 27b, N = 6 to 9 and the split die 27b. Replace with the bending mold 27c, N = 10-14, replace with the split bending mold 27d, replace with N = 15-21, split the bending mold 27e, and set N = 22-27. The bending position is sequentially shifted in the same manner as in the above (5) (see position (D) in FIG. 1), and partial bending is repeated to perform the entire bending.
[0030]
(7) If excessive bending occurs at each bending position, for example, as shown in the position (E) of FIG. 1 and FIG. With the divided bending mold 27e retracted to the retracted position, the excessively bent tapered portion 11 is bent back using the correcting means 22 at the bent position and corrected. (8) After confirming that the overall height and the output width of the tapered tube 12 in which the tapered portion 11 is bent are within predetermined standards, the tapered tube 12 is removed from the pipe fixing means and the main carriage 18 and the illumination lamp is mounted. Attach the adapter.
[0031]
The present invention is not limited to the above-described embodiments, and changes can be made without departing from the spirit of the present invention. For example, some or all of the above-described embodiments and modifications are described. The combination of the method and the apparatus for bending a tapered tube according to the present invention is also included in the scope of the present invention.
In the above-described embodiment, when the taper portion 11 is excessively bent, the overcorrected taper portion 11 is configured to be bent back at the bent position by using the correcting means 22, but the present invention is not limited to this. Alternatively, if necessary, the correcting means can be omitted. That is, the auxiliary trolley 19, the hydraulic cylinder 48 mounted on the auxiliary trolley 19, and the reaction force receiving rollers 41 and 42 mounted on the main trolley 18 can be omitted.
[0032]
The carriage 20 has a pair of reaction force receiving rollers 41 and 42 of the bending means 21 and the straightening means 22 mounted thereon, and a movable main carriage 18 on which the straightening mold 53 of the straightening means 22 can be arranged and which can be freely moved. The drive mechanism of the mold 53 is mounted, and the auxiliary carriage 19 is detachable from the main carriage 18 and is separated into a freely movable auxiliary carriage 19. However, the present invention is not limited to this, and the main carriage and the auxiliary carriage may be integrated as necessary. It is also possible to mount the bending means and the correcting means on an integrally constructed truck.
Although five replaceable split bending dies 27 are provided, the present invention is not limited to this, and two to four or six in consideration of the length, shape, pipe diameter, material (strength), etc. of the tapered portion. More than one can be provided.
[0033]
The rotating rollers 14a to 17a are used for the pipe fixing fittings 14 to 17 of the pipe fixing means. However, the present invention is not limited to this. If the base side of the tapered tube 11 can be positioned and fixed, other types of pipes can be used. A fixing means may be used. In addition, although four pipe fixing members 14 to 17 are provided, the present invention is not limited to this, and one to three or five or more pipe fixing members may be used.
Although the tapered tube 12 is used, the present invention is not limited to this. If the tapered portion is formed in a tapered shape, the base that is not subjected to bending may be a parallel tube.
[0034]
【The invention's effect】
In the method for bending a tapered pipe according to claims 1 to 3, a small split bending die divided into a plurality of portions can be used without using a bending die that covers the entire bending area as in the related art. The device can be made compact. In addition, there is no need to prepare a bending mold having a curvature corresponding to various curvatures required for the tapered portion as in the related art, and it is possible to exchange a plurality of split bending dies, and furthermore, to use the split bending dies. Since the taper portion can be bent into a predetermined shape by controlling the pushing stroke or pushing force, or the pushing stroke and pushing force, the cost of the apparatus including the bending die can be greatly reduced. Furthermore, since the bending means is mounted on the bogie with wheels, the bogie can move following the bending of the tapered portion by the bending means. Scratch is eliminated and high quality bending can be performed.
[0035]
In particular, in the method for bending a tapered pipe according to the second aspect, it is not necessary to remove the pipe once from the apparatus and perform the bending using another apparatus in order to perform the bending back as in the related art (extracting the pipe). (It is not necessary) and it can be bent back at the same position, so that the workability of the correction work is improved and the correction means can be manufactured at low cost.
In the method for bending a tapered pipe according to the third aspect, the bogie can be made compact and handling of the bogie is simplified, so that the workability of the bending operation is improved.
[0036]
In the bending apparatus for tapered pipes according to claims 4 and 5, the tapered portion of the pipe whose base side is fixed to the floor surface by the pipe fixing means is mounted on a bogie with wheels that can freely move on the floor surface. Since a plurality of split-type bending dies of the bending means can be exchanged and bent into a predetermined shape, the apparatus can be made compact, and thereby the apparatus can be inexpensive. In addition, since the bending means is mounted on the bogie with wheels, the bending means on the bogie can move following the bending of the tapered portion, thereby making it possible to move the pipe in comparison with the conventional fixed type. Scratch is eliminated and high quality bending can be performed.
In particular, in the taper pipe bending apparatus according to the fifth aspect, the carriage can be made compact and the handling of the carriage is simplified, so that the workability of the bending operation is improved.
[Brief description of the drawings]
FIG. 1 is a layout view of a taper pipe bending apparatus according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a main bogie, an auxiliary bogie, a bending means, and a correcting means of the taper pipe bending apparatus.
FIG. 3 is an explanatory view at the time of bending by a bending means of the taper pipe bending apparatus.
FIG. 4 is an explanatory view at the time of straightening by a straightening means of the bending device for the tapered pipe.
FIG. 5 is an explanatory diagram showing a relationship between a bent shape of a tapered portion of a pipe and a replaceable split bending mold in a method of bending a tapered pipe according to an embodiment of the present invention.
[Explanation of symbols]
10: taper pipe bending device, 11: taper section, 12: taper pipe (pipe), 13: floor surface, 14: pipe fixing fitting, 14a: rotating roller, 15: pipe fixing fitting, 15a: rotating roller, 16: Pipe fixing bracket, 16a: rotating roller, 17: pipe fixing bracket, 17a: rotating roller, 18: main bogie, 19: auxiliary bogie, 20: bogie, 21: bending means, 22: straightening means, 23: bogie frame, 24 : Wheel, 25, 26: reaction force receiving seat, 27, 27a to 27e: split type bending die, 28: detachable part, 29: die mounting bracket, 29a, 29b: guide roller, 30: bearing bracket, 31: Pin, 32: hydraulic cylinder, 33: rod, 34: mounting plate, 35: spacer, 36: fixing bolt, 37: nut, 38: fixed shaft, 39: rotating part, 40: receiving part, 41: Force receiving roller (reaction force receiving seat), 41a: fixed shaft, 42: reaction force receiving roller (reaction force receiving seat), 42a: fixed shaft, 43: opening, 44: connecting bracket, 45: bogie frame, 45a: connection Part, 46: wheel, 47: wheel, 48: hydraulic cylinder, 48a: head, 49: bearing bracket, 50: pin, 51: rod, 52: connection fitting, 53: straightening mold

Claims

A method of bending a tapered portion of a pipe having a tapered portion that gradually reduces in diameter toward a tip into a predetermined shape,
It is mounted on a bogie with wheels that can move freely on the floor, and is disposed opposite to a pair of reaction force receiving seats and an intermediate portion of the pair of reaction force receiving seats, and has a diameter corresponding to the diameter of the tapered portion that abuts. The curvature of the groove section is determined accordingly, and the curvature of curvature is determined according to the curvature of the tapered portion that abuts on the groove. In addition, a three-point bending type bending means including a plurality of exchangeable divided bending dies is used. ,
Securing the proximal side of the tube to the floor,
Arranging the bogie such that the bending means is located at a bending start position of the tapered portion of the pipe,
The bending position from the bending start position to the vicinity of the tip of the tapered portion is sequentially shifted with an interval therebetween, and further, is replaced with an appropriate split mold bending die according to the bending position, and further, at each of the bending positions. Controlling the pushing stroke and / or the pushing force of the split-type bending mold while bending the tapered portion into the predetermined shape while confirming the floor surface position of the tip of the pipe. Tube bending method.

2. The method for bending a tapered pipe according to claim 1, wherein, if the taper portion is excessively bent, the tapered portion is bent back at a bent position.

3. The method for bending a tapered tube according to claim 2, wherein the bogie is equipped with a pair of reaction force receiving seats for the bending means and a three-point bending type straightening means capable of bending back, and a straightening mold for the straightening means. And a tapered tip portion, which is separated into an auxiliary bogie that is equipped with a drive mechanism of the straightening mold and that is detachable and freely movable on the main bogie. Bending method.

An apparatus for bending a tapered portion of a tube having a tapered portion that gradually decreases in diameter toward a tip into a predetermined shape,
Pipe fixing means for fixing the base side of the pipe to the floor,
A cart with wheels that can move freely on the floor surface,
The groove cross-section curvature is mounted on the bogie, and is disposed to face a pair of reaction force receiving seats and an intermediate portion between the pair of reaction force receiving seats, and a groove cross-sectional curvature is determined according to a pipe diameter of the tapered portion that abuts. A bending device for a tapered pipe, wherein a bending curvature is determined in accordance with a curvature of the tapered portion in contact with the bending portion, and further comprising a three-point bending method including a plurality of replaceable split bending dies. .

5. The taper pipe bending apparatus according to claim 4, wherein the carriage is equipped with a pair of reaction force receiving seats of the bending means and a three-point bending type correcting means capable of bending back, and a correction mold of the correcting means. Characterized by being separated into a main carriage capable of disposing the main carriage, and an auxiliary carriage detachably mounted on the main carriage and having a drive mechanism for the straightening mold, which can be freely moved. .