JP2004141891A

JP2004141891A - Pipe bender and method for bending pipe

Info

Publication number: JP2004141891A
Application number: JP2002306945A
Authority: JP
Inventors: Shinichi Iwamoto; 岩本　伸一
Original assignee: COMCO CORP
Current assignee: COMCO CORP
Priority date: 2002-10-22
Filing date: 2002-10-22
Publication date: 2004-05-20
Anticipated expiration: 2022-10-22
Also published as: JP4288321B2

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a bent pipe inexpensively in the manufacturing cost, the cost of equipment or the like by performing the bending work in the predetermined part of the final bending of the object pipe rapidly and efficiently by the simplification of structure, reduction of the number of parts and the simplification of the manufacture and assembly especially about a pipe bender and a bending method of the pipe. <P>SOLUTION: At least the greater part in the front of a push rod 50 which is housed in a chuck 1 is situated and left behind in an end part of the object pipe P1 and in the front F of the outside of a chuck and successively the bending work in the predetermined part of the final bending is performed by turning a clamp table integrally with a bending die 2 to the far side from a pressure table while pressing the object pipe in the axial direction I the object pipe with the chuck through the push rod with a clamp table 3 and a pressure table 4. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明はパイプベンダー、およびパイプ曲げ加工方法に係り、特に対象パイプの最終の曲げ予定部の曲げ加工が迅速かつ効率的に行え、構造が簡単にして部品数も少なく製作および組立は簡単にして製作コスト、設備費等を安価になし得るパイプベンダー、およびパイプ曲げ加工方法に関する。
【０００２】
【従来の技術】
従来、対象パイプのパイプ曲げ加工を行うパイプベンダーは、通常、対象パイプの管端部を外周側から把持するチャックと対象パイプの曲げ予定部を曲げ型との間で挟圧保持するクランプ台のチャック側に位置して対象パイプの曲げ予定部を曲げ型との間で挟圧保持するプレッシャ台とを備えている。
そして、対象パイプの終端部の加工を効率良く行わせるためのパイプベンダーとして、従来より提案されているものは、対象パイプの管端面に対して先端を接当作用させる小径の出退扞状具を、チャックの中心軸芯上でチャック先端よりも突出する作用状態とチャック奥部に引退する引退状態とに切り換え操作自在に設け、対象パイプの管芯方向に並ぶ複数の曲げ予定部のうち、チャック側の管端近傍に位置する最終の曲げ予定部以外の曲げ予定部については、パイプ管端部を把持したチャックをその中心軸芯方向に移動させるとともに中心軸芯周りで回動させて、曲げ予定部を所要の回動姿勢で前記曲げ型に対する適切位置に位置させ、クランプ台と前記プレッシャ台とにより曲げ予定部を挟圧保持した状態で、対象パイプの管端部を把持するチャックにより対象パイプの管端部を中心軸芯方向に押圧付勢しながら、クランプ台を曲げ型と一体的にプレッシャ台からの離間側に回動させて曲げ予定部に曲げ加工を施すものであった。
しかも、最終の曲げ予定部については、出退扞状具の引退状態でパイプ管端部を把持させたチャックをその中心軸芯方向に移動させるとともに中心軸芯周りで回動させて、最終の曲げ予定部を所要の回動曲げ姿勢で前記曲げ型に対する適切位置に位置させる。その後、チャックのパイプ管端部に対する把持を解除した状態でチャックをその中心軸芯方向でプレッシャ台との非干渉位置まで引退移動させる。
引き続き、クランプ台とプレッシャ台とにより最終の曲げ予定部を挟圧保持した状態で、作用状態に切り換えた出退扞状具により対象パイプの管端を押圧付勢しながらクランプ台を曲げ型と一体的にプレッシャ台からの離間側に回動させて、最終の曲げ予定部に曲げ加工を施すものである。
従って、このパイプベンダーは、チャックとプレッシャ台との接当干渉を回避するに足る離間寸法を確保し、曲げ加工後に対象パイプの最終の管端の不必要部分を切り捨てる後処理を必要とはしないものである（例えば、特許文献１参照。）。
【０００３】
【特許文献１】
特許第３１７１６９６号公報（第１−８頁、図１−図１０）
【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に記載の上記従来のパイプベンダーは、対象パイプの最終の曲げ加工を行うには、先ず出退扞状具の引退状態でパイプ管端部を把持させたチャックを中心軸芯方向に送り用の駆動用シリンダの操作により移動させ、曲げ方向変更用のモータを中心軸芯周りで回動させて、最終の曲げ予定部を曲げ型に対する適切位置に位置させる。その後、チャックのパイプ管端部に対する把持を爪開閉用のシリンダを駆動することにより解除した状態で駆動用シリンダを駆動操作してチャックをその中心軸芯方向でプレッシャ台との非干渉位置まで引退移動させる。それから、クランプ台とプレッシャ台とにより最終の曲げ予定部を挟圧保持した状態で、作用状態に切り換えた出退扞状具により対象パイプの管端を、前記駆動用シリンダとは個別に設けた出退操作用シリンダを駆動操作することにより押圧付勢しながらクランプ台を曲げ型と一体的にプレッシャ台からの離間側に回動させて対象パイプの最終の曲げ予定部に曲げ加工を施すものである。
従って、特許文献１に記載の上記従来のパイプベンダーは、対象パイプの最終の曲げ加工を行うのに、駆動用シリンダにより軸芯方向に進退するチャックに対して駆動用シリンダとは個別の出退操作用シリンダを駆動操作することにより対象パイプの管端面に対して先端を接当作用させる小径の出退扞状具を、チャックの中心軸芯上でチャックの先端よりも突出する作用状態とチャック奥部に引退する引退状態とに切り換え操作自在に設け、しかも、チャックを進退させるための駆動用シリンダと出退扞状具を進退させるための出退操作用シリンダとの個別の駆動源を必要とするので、最終の曲げ予定部の曲げ加工を行うのに工程数が増え、多くの時間と手間がかかるとともに稼働には多くの消費電力が必要になり、しかも、構造および制御系が複雑になり、部品数も多くなるため、製作および組立が容易には行えず、製作コスト、設備費等が高価になっていた。
【０００５】
本発明は上記従来の不都合を解決するとともに、対象パイプの最終の曲げ予定部の曲げ加工を行うための工程数が省略化されて迅速かつ効率的に最終の曲げ予定部の曲げ加工が行え、また、稼働に要する消費電力が少なくて済み、しかも構造および制御系が簡素化され、部品数も少なくなるため、製作および組立が容易になり、製作コスト、設備費等を安価なパイプベンダーを提供しようとする。
【０００６】
【課題を解決するための手段】
本発明は上記課題に鑑みなされ、請求項１に記載の発明は、対象パイプの管端部を外周側から把持するチャックと、対象パイプの曲げ予定部に対する曲げ案内用の円弧状部を形成した曲げ型と、対象パイプの曲げ予定部を前記曲げ型との間で挟圧保持するクランプ台と、該クランプ台のチャック側に位置して対象パイプの曲げ予定部を前記曲げ型との間で挟圧保持するプレッシャ台とを備え、対象パイプの管芯方向に並ぶ複数の曲げ予定部のうち、チャック側の管端近傍に位置する最終の曲げ予定部以外の曲げ予定部については、パイプ管端部を把持させた前記チャックをその中心軸芯方向に移動させるとともに中心軸芯周りで回動させて、曲げ予定部を所要の回動姿勢で前記曲げ型に対する適切位置に位置させ、前記クランプ台と前記プレッシャ台とにより曲げ予定部を挟圧保持した状態で、対象パイプの管端部を把持する前記チャックにより対象パイプの管端部を中心軸芯方向に押圧付勢しながら、前記クランプ台を前記曲げ型と一体的に前記プレッシャ台からの離間側に回動させて曲げ予定部に曲げ加工を施すパイプベンダーにおいて、
プッシュロッドを前記チャック内に挿脱可能に設け、該プッシュロッドはチャック内に収容された状態でパイプ管端部を把持する前記チャックが中心軸芯方向に移動されるとともに中心軸芯周りで回動されることによりパイプ管端部の最終の曲げ予定部を所要の回動姿勢で前記曲げ型に対する適切位置に設置可能に設けられ、パイプ管端部に対する前記チャックの把持が解除された状態にて前記チャックが中心軸芯方向で、かつ前記プレッシャ台との非干渉位置まで後退移動されると、該チャック内に収容されているプッシュロッドは、対象パイプの管端部と前記チャックの外部前方に少なくとも前方の大半部が位置して置き去りにされることにより該プッシュロッドを介して前記チャックにより対象パイプの管端を押圧しながら前記クランプ台を前記曲げ型と一体に前記プレッシャ台からの離間側に回動させて前記対象パイプの最終の曲げ予定部に曲げ加工を施すことを特徴とするという手段を採用した。
【０００７】
また、本発明の請求項２に記載の発明は、請求項１において前記プッシュロッドは、対象パイプの管端部の最終の曲げ予定部の曲げ加工時に、対象パイプの管端部の後部とチャックの前端に設けるチャックの把持爪に対し配装されることによりチャックを軸芯方向に押圧自在に設けるとともに前記チャックの把持爪によりチャックとともに共用の駆動源により軸芯方向に押圧されて対象パイプの最終の曲げ予定部が前記曲げ型と一体に前記プッシャ台からの離間側に回動され、最終の曲げ予定部に曲げ加工を施すことを特徴とするという手段を採用した。
【０００８】
また、本発明の請求項３に記載の発明は、請求項１または２の何れかにおいて前記プッシュロッドは、全体が略筒状に形成され、通常時にはチャック内に設ける収容孔内に収容可能に収容され、内部には対象パイプの管端部内に配挿可能なマンドレルが中心軸芯方向に移動可能に挿入され、前端はチャックの後退移動時に前記マンドレルの先端側に形成する膨拡状の係合肩部に係脱可能に設けられるとともに前端は対象パイプの管端部に係脱可能な係合部が形成され、中間部外周にはチャックの押圧時にチャックの把持爪が係合可能な第１の外鍔部が形成され、後端には収容孔内にプッシュロッドを収納する時に摺動可能にストッパに当接可能な第２の外鍔部が形成されたことを特徴とするという手段を採用した。
【０００９】
また、本発明の請求項４に記載の発明は、対象パイプの管端部を外周側から把持するチャックと、対象パイプの曲げ予定部に対する曲げ案内用の円弧状部を形成した曲げ型と、対象パイプの曲げ予定部を前記曲げ型との間で挟圧保持するクランプ台と、該クランプ台のチャック側に位置して対象パイプの曲げ予定部を前記曲げ型との間で挟圧保持するプレッシャ台とを備え、対象パイプの管芯方向に並ぶ複数の曲げ予定部のうち、チャック側の管端近傍に位置する最終の曲げ予定部以外の曲げ予定部については、パイプ管端部を把持した前記チャックをその中心軸芯方向に移動させるとともに中心軸芯周りで回動させて、曲げ予定部を所要の回動姿勢で前記曲げ型に対する適切位置に位置させ、前記クランプ台と前記プレッシャ台とにより曲げ予定部を挟圧保持した状態で、対象パイプの管端部を把持する前記チャックにより対象パイプの管端部を押圧付勢しながら、前記クランプ台を前記曲げ型と一体的に前記プレッシャ台からの離間側に回動させて曲げ予定部に曲げ加工を施すパイプ曲げ加工方法において、
対象パイプの最終の曲げ予定部の曲げ加工は、プッシュロッドが挿脱可能にチャック内に収容された状態でパイプ管端部を把持する前記チャックが中心軸芯方向に移動されるとともに中心軸芯周りで回動させることによりパイプ管端部の最終の曲げ予定部を所要の回動姿勢で前記曲げ型に対する適切位置に設置させた後、パイプ管端部に対する前記チャックの把持が解除された状態にて前記チャックが中心軸芯方向で、かつ前記プレッシャ台との非干渉位置まで後退移動させることによりチャック内に収容されているプッシュロッドは、対象パイプの管端部と前記チャックの外部前方に少なくとも前方の大半部が位置して置き去りにされ、続いて前記クランプ台と前記プレッシャ台とにより前記プッシュロッドを介して前記チャックにより対象パイプの管端を中心軸芯方向に押圧しながら前記クランプ台を前記曲げ型と一体に前記プレッシャ台からの離間側に回動させて最終の曲げ予定部に曲げ加工を施すことを特徴とするという手段を採用した。
【００１０】
【発明の実施の形態】
以下、図面に従って本発明の実施の形態の具体例の詳細を説明する。
図１は本発明のパイプベンダーの一実施形態を示し、対象パイプの最終の曲げ予定部に曲げ加工を施している状態の断面図、図２は同じくプッシュロッドを介して対象パイプの管端部を中心軸芯方向に押圧する状態の断面図、図３は同じくプッシュロッドがチャック内に収納されている拡大断面図、図４は同じくプッシュロッドを介して対象パイプの管端部を中心軸芯方向に押圧する状態の拡大断面図、図５は本発明のパイプベンダーの全体構成を示す側面図、図６は同じく平面図、図７は側面図、図８は斜視図である。
【００１１】
本実施形態のベンダーでは、対象パイプＰの管端部Ｐ１を外周側から把持するチャック１と、対象パイプＰの曲げ予定部に対する曲げ案内用の円弧状部２ｍを形成した曲げ型２と、対象パイプＰの曲げ予定部を前記曲げ型２との間で挟圧保持するクランプ台３と、該クランプ台３のチャック１側に位置して対象パイプＰの曲げ予定部を前記曲げ型２との間で挟圧保持するプレッシャ台４とを備え、対象パイプＰの管芯方向に並ぶ複数の曲げ予定部のうち、チャック１側の管端近傍に位置する最終の曲げ予定部以外の曲げ予定部については、対象パイプＰの管端部Ｐ１を把持させた前記チャック１をその中心軸芯方向Ｉに移動させるとともに中心軸芯周りＷで回動させて、曲げ予定部を所要の回動姿勢で前記曲げ型２に対する適切位置に位置させ、前記クランプ台３と前記プレッシャ台４とにより曲げ予定部を挟圧保持した状態で、対象パイプＰの管端部Ｐ１を把持する前記チャック１により対象パイプＰの管端部Ｐ１を中心軸芯方向Ｉに押圧付勢しながら、前記クランプ台３を前記曲げ型２と一体的に前記プレッシャ台４からの離間側に回動させて曲げ予定部に曲げ加工を施す点は特許文献１に記載の従来のパイプベンダーと略同様の構成を採用し、同様の作用である。
【００１２】
しかしながら、本実施形態のパイプベンダーでは、プッシュロッド５０を前記チャック１内に挿脱可能に設けている。
このプッシュロッド５０は、図１、図２に示すように、全体が略筒状に形成され、通常時にはチャック１内に設ける収容孔１ａ内に収容され（図３参照）、内部には対象パイプＰの管端部Ｐ１内に配挿可能なマンドレル５１が中心軸芯方向Ｉに移動可能に挿入され、前端はチャック１の後退移動時に前記マンドレル５１の先端側に形成する膨拡状の係合肩部５１ａに係脱可能に設けられるとともに前端は対象パイプＰの管端部Ｐ１に係脱可能な係合部５２Ａが形成され、中間部外周にはチャック１の押圧時にチャック１の把持爪１Ａが係合可能な第１の外鍔部５２Ｂが形成され、後端には収容孔１ａ内にプッシュロッド５０に収納する時に摺動可能にストッパ５３に当接可能な第２の外鍔部５２Ｃが形成されている。対象パイプＰの管端部Ｐ１に係脱可能な係合部５２Ａとしては、例えば図示する実施形態では小径な係合段部が採用される。
そして、該プッシュロッド５０は、図３に示すようにチャック１内に収容された状態で対象パイプＰの管端部Ｐ１を把持する前記チャック１が中心軸芯方向Ｉに移動されるとともに中心軸芯周りＷで管端部Ｐ１が回動されることにより対象パイプＰの管端部Ｐ１の最終の曲げ予定部を所要の回動姿勢で曲げ型２に対する適切位置に設置可能に設けられる。
【００１３】
そして、対象パイプＰの管端部Ｐ１に対する前記チャック１の把持が解除された状態にて図に示すように前記チャック１が中心軸芯方向Ｉで、かつ前記プレッシャ台４との非干渉位置Ｊまで後退移動されると、図３に示すように該チャック１の収容孔１ａ内に収容されているプッシュロッド５０は、対象パイプＰの管端部Ｐ１の最終の曲げ予定部の曲げ加工時に、対象パイプＰの管端部Ｐ１の後部と前記チャック１の外部前方Ｆに少なくとも前方の大半部が位置して置き去りにされる。
すなわち、プッシュロッド５０は、対象パイプＰの管端部Ｐ１の最終の曲げ予定部の曲げ加工時に、対象パイプＰの管端部Ｐ１とチャック１の前端に設けるチャック１の複数の把持爪１Ａとに対して配挿される。また、マンドレル５１の先端側は、対象パイプＰの終段側の曲げ予定部に曲げ加工を容易かつ迅速に施せるように、管端部Ｐ１を中心軸芯周りＷに回動するのに追従して屈曲可能になるように先端部側が分割された複数個が連結されている。
【００１４】
そして、中心軸芯方向Ｉに押圧自在に設けた前記チャック１の把持爪１Ａによりプッシュロッド５０を介して対象パイプＰの管端部Ｐ１をチャック１とともに共用の駆動源としての駆動用シリンダ５４により中心軸芯方向Ｉに押圧しながら前述のように前記クランプ台３を前記曲げ型２と一体に前記プレッシャ台４からの離間側に回動させて前記対象パイプＰの最終の曲げ予定部に曲げ加工を施すことができる。
５５はチャック１を搭載する基台Ｂに係止され、架台Ｋ上に長手方向にスプロケット５６，５７を介して懸架された回転受動部品としての２本のチェーンであり、このチェーン５５，５５は架台Ｋに備えたモータＭ，Ｍのモータシャフトに装着するスプロケット５６，５６が係合することにより駆動用シリンダ５４の駆動と共働してチャック１を備えた基台Ｂは中心軸芯方向Ｉに案内移動される。
なお、図中５８は基台Ｂに設けられ、チャック１からプッシュロッド５０の少なくとも前方の大半部を突出するためのシリンダであり、５９はチャック１の把持爪１Ａを開閉するためのシリンダである。
【００１５】
本発明のベンダーの一実施形態は以上の構成からなり、対象パイプＰの最終の曲げ予定部の曲げ加工を行うには、先ず、プッシュロッド５０が収容孔１ａ内に収容された状態のチャック１は、対象パイプＰの管端部Ｐ１を把持爪１Ａにより把持した状態で、駆動用シリンダ５４が駆動するのと、このように駆動用シリンダ５４が駆動するのと共働して架台Ｋに備えたモータＭ，Ｍが駆動することによりモータシャフトに装着したスプロケット５６，５６によりチェーン５５，５５が回転移動されることにより基台Ｂは中心軸芯方向Ｉに移動される。
【００１６】
この際、対象パイプＰの管端部Ｐ１の最終の曲げ予定部を所要の回動姿勢で曲げ型２に対する適切位置に設置させておく。しかも、チャック１に設けた収容孔１ａ内に収容されている前記プッシュロッド５０は、その先端に係合部５２Ａとしての係止段部が設けられているので、対象パイプＰを中心軸芯方向Ｉに移動した場合に、この係止段部が対象パイプＰの管端部Ｐ１内に容易に係止され、対象パイプＰと一体になる。
【００１７】
次いで、対象パイプＰの管端部Ｐ１に対するチャック１の把持爪１Ａによる把持が解除されて緩むと、駆動用シリンダ５４が駆動するのと、モータＭ，Ｍが駆動してチェーン５５，５５が回転駆動することにより、前記チャック１が中心軸芯方向Ｉで、かつ前記プレッシャ台４との非干渉位置Ｊまで基台Ｂ毎後退移動される。
【００１８】
そして、チャック１が中心軸芯方向Ｉで、かつ前記プレッシャ台４との非干渉位置Ｊまで後退移動されると、プレッシャ台４は閉まり、クランプ台３により対象パイプＰの管端部Ｐ１の最終の曲げ予定部を挟圧保持する。
【００１９】
こうして、チャック１が中心軸芯方向Ｉにプレッシャ台４との非干渉位置Ｊまで後退移動されると、チャック１の収容孔１ａ内に収容されていたプッシュロッド５０は、その前端に設けた係合部５２Ａが前述のように対象パイプＰの管端部Ｐ１内に係止されることによりチャック１の収容孔１ａから少なくとも前方の大半部が抜け出る（図３，図４参照）。しかも、プッシュロッド５０に対してチャック１の把持爪１Ａは、プッシュロッド５０に対して、その中間部に形成される第１の外鍔部５２Ｂと、プッシュロッド５０の後端に形成される第２の外鍔部５２Ｃとの間に位置してマンドレル５１を中心に置き去りにされる。
【００２０】
そして、プッシュロッド５０がチャック１の収容孔１ａから前方の大半部が抜け出て対象パイプＰの管端部Ｐ１との間に置き去りにされた後に、シリンダ５９が駆動されることによりチャック１の把持爪１Ａを閉じると、この把持爪１Ａはプッシュロッド５０の中間部に形成される第１の外鍔部５２Ｂに係止され、プッシュロッド５０を把持するとともにプッシュロッド５０の後端に設けた第２の外鍔部５２Ｃとの間に係入される（図４参照）。
【００２１】
その後、共用の駆動源としての駆動用シリンダ５４が駆動されるのと、モータＭ，Ｍが駆動するのとからチャック１が前進されると、チャック１の把持爪１Ａが第１の外鍔部５２Ｂに係合されているプッシュロッド５０を介して対象パイプＰの管端部Ｐ１を中心軸芯方向Ｉに押圧するので、クランプ台３が曲げ型２と一体にプレッシャ台４からの離間側に回動されることにより対象パイプＰの管端部Ｐ１における最終の曲げ予定部に曲げ加工が施される。
【００２２】
その後、再び共用の駆動源としての駆動用シリンダ５４を駆動されるのと、モータＭ，Ｍが回転駆動しチェーン５５，５５が回転、移動するのとからチャック１が後退する。そして、シリンダ５９が駆動して把持爪１Ａが開かれると、対象パイプＰの終段の曲げ予定部内に挿入されていたマンドレル５１が対象パイプＰとプッシュロッド５０との内部を後退する。そして、プッシュロッド５０の前端は、その前端がマンドレル５１の先端側に設けられている膨拡状の係合肩部５１ａに係合されるので、マンドレル５１の後退に伴い、把持爪１Ａが開かれたチャック１の収容孔１ａ内にストッパ５３に当接するまでマンドレル５１により引き込まれて後退されることにより収容され、旧位に復し、次期の対象パイプＰの終段曲げ加工に備える。
【００２３】
このように、本実施形態のパイプベンダーは、特許文献１に記載の従来のパイプベンダーにおいては、対象パイプの最終の曲げ予定部に曲げ加工を施す際に、曲げ型に対して対象パイプの最終の曲げ予定部を適切位置に位置させ、次いでチャックのパイプ管端部に対する把持を爪開閉用のシリンダを駆動して解除した状態で駆動用シリンダを駆動操作してチャックをその中心軸芯方向でプレッシャ台との非干渉位置まで引退移動させた後に、クランプ台とプレッシャ台とにより最終の曲げ予定部を挟圧保持した状態で、前記駆動用シリンダとは個別に設けた出退操作用シリンダを駆動操作することにより作用状態に切り換えた出退扞状具により対象パイプの管端を押圧付勢して対象パイプの最終の曲げ予定部に曲げ加工を施すようにしているのとは異なり、チャック１内に収容されているプッシュロッド５０を、対象パイプＰの管端部Ｐ１と前記チャック１の外部前方に少なくとも前方の大半部が位置して置き去りにされるプッシュロッド５０を介してチャック１により対象パイプＰを押圧しながらクランプ台３を曲げ型２と一体にプレッシャ台４からの離間側に回動させて対象パイプＰの最終の曲げ予定部に曲げ加工を施す構成を採用している。
【００２４】
従って、本実施形態のパイプベンダーでは、特許文献１のように駆動用シリンダとは個別に設けた出退操作用シリンダを駆動操作することにより作用状態に切り換えた出退扞状具により対象パイプの管端部を押圧付勢するのではなく、シリンダ５８を駆動することにより対象パイプＰの管端部Ｐ１とチャック１の外部前方との間にプッシュロッド５０の少なくとも前方の大半部を突出させたり、またはチャック１の収容孔１ａ内に収容させ、プッシュロッド５０を介して対象パイプＰを中心軸芯方向Ｉへ移動させて最終の曲げ予定部に曲げ加工を行うので、対象パイプＰの最終の曲げ予定部に曲げ加工を行うための工程数が複雑化することなく省略化され、迅速かつ効率的に、しかも確実に最終の曲げ予定部の曲げ加工を行うことができる。また、本実施形態では、対象パイプＰの最終に曲げ加工を施すのに、管端部Ｐ１をプッシュロッド５０にて押圧、移動させる場合に、プッシュロド５０をチャック１に対して少なくとも前方に大半部を突出させて行うようにしているが、これに限ることなくプッシュロッド５０はチャック１の前方に完全に突出されてから、チャック１の前端にて押圧されるようにする場合でも本発明の適用範囲である。
【００２５】
また、チャック１の進退移動動作と、対象パイプＰの最終の曲げ加工に要する押圧動作とは、共用の駆動源としての１つの駆動シリンダー５４を駆動することにより行われるのと、この駆動シリンダー５４を駆動するのと協同して架台Ｋに備えたモータＭ，Ｍを駆動させてそのモータシャフトに装着したスプロケット５６，５６によりチェーン５５，５５を回転、移動させることによりチャック１を確実に移動案内するので、前記モータＭ，Ｍの稼働に要する消費電力が少なくて済むとともにこのモータを小容量にすることができるため、構造および制御系が簡素化され、部品数も少なくなり、製作および組立が容易になり、製作コスト、設備費等は安価になる。
【００２６】
【発明の効果】
本発明の請求項１に記載の発明は以上のように、対象パイプの管端部を外周側から把持するチャックと、対象パイプの曲げ予定部に対する曲げ案内用の円弧状部を形成した曲げ型と、対象パイプの曲げ予定部を前記曲げ型との間で挟圧保持するクランプ台と、該クランプ台のチャック側に位置して対象パイプの曲げ予定部を前記曲げ型との間で挟圧保持するプレッシャ台とを備え、対象パイプの管芯方向に並ぶ複数の曲げ予定部のうち、チャック側の管端近傍に位置する最終の曲げ予定部以外の曲げ予定部については、パイプ管端部を把持させた前記チャックをその中心軸芯方向に移動させるとともに中心軸芯周りで回動させて、曲げ予定部を所要の回動姿勢で前記曲げ型に対する適切位置に位置させ、前記クランプ台と前記プレッシャ台とにより曲げ予定部を挟圧保持した状態で、対象パイプの管端部を把持する前記チャックにより対象パイプの管端部を中心軸芯方向に押圧付勢しながら、前記クランプ台を前記曲げ型と一体的に前記プレッシャ台からの離間側に回動させて曲げ予定部に曲げ加工を施すパイプベンダーにおいて、
プッシュロッドを前記チャック内に挿脱可能に設け、該プッシュロッドはチャック内に収容された状態でパイプ管端部を把持する前記チャックが中心軸芯方向に移動されるとともに中心軸芯周りで回動されることによりパイプ管端部の最終の曲げ予定部を所要の回動姿勢で前記曲げ型に対する適切位置に設置可能に設けられ、
パイプ管端部に対する前記チャックの把持が解除された状態にて前記チャックが中心軸芯方向で、かつ前記プレッシャ台との非干渉位置まで後退移動されると、該チャック内に収容されているプッシュロッドは、対象パイプの管端部と前記チャックの外部前方に少なくとも前方の大半部が位置して置き去りにされることにより該プッシュロッドを介して前記チャックにより対象パイプの管端を押圧しながら前記クランプ台を前記曲げ型と一体に前記プレッシャ台からの離間側に回動させて前記対象パイプの最終の曲げ予定部に曲げ加工を施すことを特徴とし、また、本発明の請求項４に記載の発明は、対象パイプの管端部を外周側から把持するチャックと、対象パイプの曲げ予定部に対する曲げ案内用の円弧状部を形成した曲げ型と、対象パイプの曲げ予定部を前記曲げ型との間で挟圧保持するクランプ台と、該クランプ台のチャック側に位置して対象パイプの曲げ予定部を前記曲げ型との間で挟圧保持するプレッシャ台とを備え、対象パイプの管芯方向に並ぶ複数の曲げ予定部のうち、チャック側の管端近傍に位置する最終の曲げ予定部以外の曲げ予定部については、パイプ管端部を把持した前記チャックをその中心軸芯方向に移動させるとともに中心軸芯周りで回動させて、曲げ予定部を所要の回動姿勢で前記曲げ型に対する適切位置に位置させ、前記クランプ台と前記プレッシャ台とにより曲げ予定部を挟圧保持した状態で、対象パイプの管端部を把持する前記チャックにより対象パイプの管端部を押圧付勢しながら、前記クランプ台を前記曲げ型と一体的に前記プレッシャ台からの離間側に回動させて曲げ予定部に曲げ加工を施すパイプ曲げ加工方法において、
対象パイプの最終の曲げ予定部の曲げ加工は、プッシュロッドが挿脱可能にチャック内に収容された状態でパイプ管端部を把持する前記チャックが中心軸芯方向に移動されるとともに中心軸芯周りで回動させることによりパイプ管端部の最終の曲げ予定部を所要の回動姿勢で前記曲げ型に対する適切位置に設置させた後、パイプ管端部に対する前記チャックの把持が解除された状態にて前記チャックが中心軸芯方向で、かつ前記プレッシャ台との非干渉位置まで後退移動させることによりチャック内に収容されているプッシュロッドは、対象パイプの管端部と前記チャックの外部前方に少なくとも前方の大半部が位置して置き去りにされ、続いて前記クランプ台と前記プレッシャ台とにより前記プッシュロッドを介して前記チャックにより対象パイプを中心軸芯方向に押圧しながら前記クランプ台を前記曲げ型と一体に前記プレッシャ台からの離間側に回動させて最終の曲げ予定部に曲げ加工を施すことを特徴とするので、対象パイプの最終の曲げ予定部の曲げ加工を行うための工程数が省略化されて迅速かつ効率的に最終の曲げ予定部の曲げ加工を行うことができる。また、チャックを軸芯方向に進退するのに要するモータの消費電力が少なくて済み、しかも構造および制御系が簡素化され、部品数も少なくなるため、製作および組立が容易になり、製作コスト、設備費等は安価になる。
【００２７】
また、本発明の請求項２に記載の発明は、請求項１において前記プッシュロッドは、対象パイプの管端部の最終の曲げ予定部の曲げ加工時に、対象パイプの管端部の後部とチャックの前端に設けるチャックの把持爪に対して配装されることによりチャックを中心軸芯方向に押圧自在に設けるとともに前記チャックの把持爪によりチャックとともに共用の駆動源により中心軸芯方向に押圧されて対象パイプの最終の曲げ予定部が前記曲げ型と一体に前記プッシャ台からの離間側に回動され、最終の曲げ予定部に曲げ加工を施すことを特徴とするので、対象パイプの最終の曲げ予定部に曲げ加工を行うための工程数が複雑化することなく省略化され、迅速かつ効率的に、しかも確実に最終の曲げ予定部の曲げ加工を行うことができる。
また、チャックの進退移動動作と、対象パイプの最終の曲げ加工に要する押圧動作とは、共用の駆動源としての１つの駆動シリンダーを駆動することにより行われるのと、この駆動シリンダーを駆動するのと協同して架台に備えたチェーンを回転、移動するモータの駆動とにより行われるので、モータの稼働に要する消費電力が少なくて済むとともにこのモータを小容量にすることができ、しかも構造および制御系が簡素化され、部品数も少なくなり、製作および組立が容易になり、製作コスト、設備費等は安価になる。
【００２８】
また、本発明の請求項３に記載の発明は、請求項１または２の何れかにおいて前記プッシュロッドは、全体が略筒状に形成され、通常時にはチャック内に設ける収容孔内に収容可能に収容され、内部には対象パイプの管端部内に配挿可能なマンドレルが中心軸芯方向に移動可能に挿入され、前端はチャックの後退移動時に前記マンドレルの先端側に形成する膨拡状の係合肩部に係脱可能に設けられるとともに前端は対象パイプの管端部に係脱可能な係合部が形成され、中間部外周にはチャックの押圧時にチャックの把持爪が係合可能な第１の外鍔部が形成され、後端には収容孔内にプッシュロッドに収納する時に摺動可能にストッパに当接可能な第２の外鍔部が形成されたことを特徴とするので、対象パイプの管端部の最終の曲げ予定部の曲げ加工時に、対象パイプの管端部の後部とチャックとの間にプッシュロッドを介して対象パイプの管端部を押圧したり、またはチャックの収容孔内にプッシュロッドを収容するのに共用の駆動源としての１つの駆動シリンダーを駆動することにより確実に行うことができる。
【図面の簡単な説明】
【図１】図１は本発明のパイプベンダーの一実施形態を示し、対象パイプの最終の曲げ予定部に曲げ加工を施している状態の断面図である。
【図２】図２は同じくプッシュロッドを介して対象パイプの管端部を中心軸芯方向に押圧する状態の断面図である。
【図３】図３は同じくプッシュロッドがチャック内に収納されている拡大断面図である。
【図４】図４は同じくプッシュロッドを介して対象パイプの管端部を中心軸芯方向に押圧する状態の拡大断面図である。
【図５】図５は本発明のパイプベンダーの全体構成を示す側面図である。
【図６】図６は同じく平面図である。
【図７】図７は同じく側面図である。
【図８】図８は同じく斜視図である。
【符号の説明】
１　　　チャック
１Ａ　　把持爪
２　　　曲げ型
２ｍ　　円弧状部
３　　　クランプ台
４　　　プレッシャ台
５０　　プッシュロッド
５１　　マンドレル
５１ａ　係合肩部
５２Ａ　係合部
５２Ｂ　第１の外鍔部
５２Ｃ　第２の外鍔部
５３　　ストッパ
５４　　駆動シリンダ
５８　　シリンダ
５９　　シリンダ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pipe bender and a pipe bending method, and in particular, can quickly and efficiently bend a target bent portion of a target pipe, has a simple structure, has a small number of parts, and is easy to manufacture and assemble. The present invention relates to a pipe bender capable of reducing manufacturing costs, equipment costs, and the like, and a pipe bending method.
[0002]
[Prior art]
Conventionally, a pipe bender that performs pipe bending of a target pipe usually includes a clamp table that holds a chuck for gripping a pipe end of the target pipe from an outer peripheral side and a bent portion of a target pipe to be bent between a bending die. And a pressure table which is located on the chuck side and holds the portion to be bent of the target pipe with a bending die.
Conventionally, as a pipe bender for efficiently processing the end portion of a target pipe, a small-diameter projecting / retracting rod-shaped tool that causes the tip to abut against the pipe end face of the target pipe is known. Is provided on the central axis of the chuck so as to be freely operable to be switched between an operation state protruding from the tip of the chuck and a retired state retreating to the inner part of the chuck, and among a plurality of scheduled bending portions arranged in the pipe core direction of the target pipe, For the to-be-bent portion other than the final to-be-bent portion located near the pipe end on the chuck side, the chuck holding the pipe tube end is moved in the direction of the center axis and rotated around the center axis, The bent part is positioned at an appropriate position with respect to the bending die in a required rotating posture, and the pipe end of the target pipe is gripped while the bent part is held by the clamp table and the pressure table. The clamp base is rotated integrally with the bending die toward the side away from the pressure base while the pipe end of the target pipe is pressed and urged in the direction of the center axis by the chuck, thereby bending the portion to be bent. Met.
In addition, with respect to the final bent portion, the chuck holding the pipe pipe end is moved in the direction of the center axis and rotated about the center axis in the retraction state of the retractable rod-shaped tool, so that the final bending is performed. The part to be bent is positioned at an appropriate position with respect to the bending die in a required rotational bending posture. Thereafter, the chuck is retreated in the center axis direction to a position where the chuck does not interfere with the pressure table in a state where the grip of the chuck with respect to the pipe tube end is released.
Subsequently, with the final bent portion to be clamped and held by the clamp table and the pressure table, the clamp table is bent by pressing the pipe end of the target pipe with the retractable rod-shaped tool switched to the operating state. The bending is performed on the final bent portion by rotating integrally with the pressure table to the side away from the pressure table.
Therefore, this pipe bender secures a sufficient separation dimension to avoid contact interference between the chuck and the pressure base, and does not require a post-processing for cutting off an unnecessary portion of the final pipe end of the target pipe after bending. (For example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No. 3171696 (pages 1-8, FIGS. 1-10)
[0004]
[Problems to be solved by the invention]
However, in the conventional pipe bender described in Patent Document 1, in order to perform the final bending of the target pipe, first, the chuck holding the end of the pipe pipe in the retracted state of the retractable rod-like tool has a center axis center. The bending cylinder is moved by operating the driving cylinder for feeding in the direction, and the motor for changing the bending direction is rotated around the center axis, so that the final bent portion is positioned at an appropriate position with respect to the bending die. After that, the gripping of the chuck to the pipe end is released by driving the claw opening / closing cylinder, and then the driving cylinder is driven to retreat the chuck in the direction of its center axis to a position where the chuck does not interfere with the pressure base. Move. Then, in a state in which the final bent portion is to be held by the clamp table and the pressure table, the pipe end of the target pipe is provided separately from the driving cylinder by the retractable rod-shaped tool switched to the operating state. Bending is performed on the final bent portion of the target pipe by rotating the clamp table integrally with the bending die toward the side away from the pressure table while pressing and biasing by operating the retracting operation cylinder. It is.
Therefore, the conventional pipe bender described in Patent Literature 1 separates the chuck that advances and retreats in the axial direction by the driving cylinder separately from the driving cylinder when performing the final bending of the target pipe. The operating state in which the small-diameter retractable rod-shaped tool, whose tip abuts against the pipe end face of the target pipe by driving the operating cylinder, protrudes beyond the chuck tip on the center axis of the chuck. A separate drive source is required for switching between the retracted state and the retracted state at the back, and a driving cylinder for moving the chuck forward and backward and a retracting cylinder for moving the retractable rod-shaped tool. Therefore, the number of steps is increased to perform the bending of the final bent portion, it takes a lot of time and labor, and a lot of power consumption is required for operation, and the structure and control Is complicated, because the number of components also increased, can not be performed is easier to manufacture and assembly, manufacturing costs, equipment costs, etc. had become expensive.
[0005]
The present invention solves the conventional inconveniences described above, and the number of steps for bending the final bent portion of the target pipe is reduced, so that the final bent portion can be bent quickly and efficiently, In addition, the power consumption required for operation is reduced, the structure and control system are simplified, and the number of parts is reduced, which facilitates production and assembly, and provides a pipe bender with low production costs and equipment costs. try to.
[0006]
[Means for Solving the Problems]
The present invention has been made in view of the above problems, and the invention according to claim 1 has formed a chuck for gripping a pipe end of an object pipe from an outer peripheral side and an arc-shaped part for bending guide to a part to be bent of the object pipe. A bending die, a clamp base for holding a bending target portion of the target pipe between the bending die and the bending die, and a bending target portion of the target pipe positioned on the chuck side of the clamp base between the bending die. A pressure base for holding the squeezing pressure, and among a plurality of bendable portions arranged in the pipe core direction of the target pipe, for a bendable portion other than the final bendable portion located near the pipe end on the chuck side, a pipe pipe The chuck, whose end is gripped, is moved in the direction of the center axis and rotated around the center axis, so that the portion to be bent is positioned at an appropriate position with respect to the bending mold in a required rotation posture, and the clamp is formed. The table and the pre In a state in which the to-be-bent portion to be bent is held by the sha base, the chuck end that grips the end of the target pipe is pressed against the end of the target pipe in the direction of the center axis by the chuck to hold the end of the target pipe. In a pipe bender that bends a portion to be bent by rotating to a side away from the pressure base integrally with a bending die,
A push rod is provided so as to be insertable into and removable from the chuck. The push rod is housed in the chuck, and the chuck for gripping the pipe pipe end is moved in the direction of the center axis and rotated around the center axis. By being moved, the final bending portion of the pipe pipe end is provided so as to be able to be installed at an appropriate position with respect to the bending die in a required rotation posture, and the grip of the chuck with respect to the pipe pipe end is released. When the chuck is retracted to the center axis direction and to a position where the chuck does not interfere with the pressure table, the push rod accommodated in the chuck is moved forward from the pipe end of the target pipe to the outside of the chuck. At least the most part in front is located and left behind, and the clamp is pressed while pressing the pipe end of the target pipe by the chuck through the push rod. Platform was adopted means that characterized by applying spaced side is rotated by bending a final bending plan portion of the target pipe processing from the pressure base to the bending die and integrally.
[0007]
Further, in the invention according to claim 2 of the present invention, the push rod according to claim 1 is arranged such that the push rod and the rear end of the pipe end of the target pipe are chucked at the time of bending the final scheduled bending portion of the pipe end of the target pipe. The chuck is provided so as to be able to be pressed in the axial direction by being disposed on the gripping claw of the chuck provided at the front end of the chuck, and is pressed in the axial direction by the common driving source together with the chuck by the gripping claw of the chuck. Means is employed in which the final bending portion is rotated integrally with the bending die toward the side away from the pusher table, and the final bending portion is subjected to bending.
[0008]
According to a third aspect of the present invention, in the first or second aspect, the push rod is formed in a substantially cylindrical shape as a whole, and can be accommodated in an accommodation hole provided in a chuck at normal times. A mandrel that can be accommodated and inserted into the pipe end of the target pipe is movably inserted in the center axis direction, and a front end of the mandrel is formed on the front end side of the mandrel when the chuck is moved backward. The front end has a detachable engaging portion formed at the pipe end of the target pipe, and the outer end of the intermediate portion is engageable with a gripping claw of the chuck when the chuck is pressed. (1) an outer flange portion is formed, and a second outer flange portion is formed at a rear end of the push rod so as to be slidably contactable with a stopper when the push rod is housed in the housing hole. It was adopted.
[0009]
In addition, the invention according to claim 4 of the present invention is a chuck that grips the pipe end of the target pipe from the outer peripheral side, and a bending mold that forms an arc-shaped portion for bending guidance with respect to a bending portion of the target pipe, A clamp table for holding a bending portion of a target pipe between the bending mold and the bending die; and a clamping table for holding a planned bending portion of the target pipe between the bending mold and a chuck side of the clamp table. A pressure base is provided, and among a plurality of to-be-bent portions arranged in the pipe core direction of the target pipe, for a to-be-bent portion other than the final to-be-bent portion located near the chuck-side pipe end, the pipe end is gripped. Moving the chuck in the direction of the center axis and rotating the chuck around the center axis to position the portion to be bent at an appropriate position with respect to the bending die in a required rotation posture, and the clamp table and the pressure table. And song by In a state in which the scheduled portion is held in a squeezed state, the clamp table is integrated with the bending mold from the pressure table while pressing and urging the pipe end of the target pipe by the chuck for gripping the pipe end of the target pipe. In the pipe bending method of bending the portion to be bent by rotating to the separated side of the pipe,
In the bending process of the final bent portion of the target pipe, the chuck for gripping the pipe pipe end in a state where the push rod is housed in the chuck so that it can be inserted and removed is moved in the center axis direction and the center axis is A state in which the gripping of the chuck to the pipe tube end is released after the final planned bending portion of the pipe tube end is set at a proper rotation position with respect to the bending die by rotating the pipe tube around. By pushing the chuck back in the center axis direction and to a position where the chuck does not interfere with the pressure base, the push rod accommodated in the chuck is moved toward the pipe end of the target pipe and the outside front of the chuck. At least the majority of the front is located and left behind, and then clamped by the chuck via the push rod by the clamp and pressure bases. While pressing the pipe end in the direction of the center axis, the clamp table is rotated integrally with the bending die toward a side away from the pressure table to perform bending on the final bending portion. That means was adopted.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific examples of the embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment of a pipe bender according to the present invention, and is a cross-sectional view showing a state in which a final bent portion of a target pipe is subjected to a bending process. FIG. 2 is also a pipe end of the target pipe via a push rod. 3 is an enlarged sectional view showing a state in which the push rod is housed in the chuck, and FIG. 4 is a sectional view showing the pipe end of the target pipe through the push rod. FIG. 5 is a side view showing the entire configuration of the pipe bender of the present invention, FIG. 6 is a plan view thereof, FIG. 7 is a side view, and FIG. 8 is a perspective view.
[0011]
In the bender according to the present embodiment, a chuck 1 for gripping a pipe end P1 of a target pipe P from an outer peripheral side, a bending mold 2 having an arc-shaped portion 2m for guiding a bent portion of the target pipe P to be bent, and a target A clamp table 3 for holding the pipe P to be bent between the bending mold 2 and the bending table 2, and a bending section of the target pipe P located on the chuck 1 side of the clamp table 3 and the bending table 2. And a pressure base 4 for holding the pressure between them, and among the plurality of planned bending portions arranged in the pipe core direction of the target pipe P, the planned bending portion other than the final planned bending portion located near the pipe end on the chuck 1 side. With regard to the above, the chuck 1 holding the pipe end P1 of the target pipe P is moved in the central axis direction I and is rotated around the central axis W, so that the part to be bent is rotated in a required rotational posture. Positioned at an appropriate position with respect to the bending mold 2 In a state where a portion to be bent is held by the clamp table 3 and the pressure table 4 under pressure, the pipe end P1 of the target pipe P is centered by the chuck 1 that grips the pipe end P1 of the target pipe P. Patent Document 1 describes that the clamp table 3 is rotated integrally with the bending die 2 toward the side away from the pressure table 4 while being pressed and urged in the direction I to perform a bending process on a portion to be bent. The configuration is substantially the same as that of the conventional pipe bender and the operation is the same.
[0012]
However, in the pipe bender of the present embodiment, the push rod 50 is provided so as to be insertable into and removable from the chuck 1.
As shown in FIGS. 1 and 2, the push rod 50 is formed in a substantially cylindrical shape as a whole, and is normally housed in a housing hole 1 a provided in the chuck 1 (see FIG. 3). A mandrel 51 that can be inserted into the pipe end P1 of the P is movably inserted in the center axis direction I, and the front end is an expanding engagement formed on the distal end side of the mandrel 51 when the chuck 1 moves backward. An engaging portion 52A is formed on the shoulder 51a so as to be detachable and engageable with the pipe end P1 of the target pipe P at the front end. Is formed at the rear end, and a second outer flange 52C slidably abuttable against the stopper 53 when housed in the push rod 50 in the housing hole 1a. Is formed. As the engaging portion 52A that can be engaged with and disengaged from the pipe end P1 of the target pipe P, for example, a small-diameter engaging step portion is adopted in the illustrated embodiment.
When the push rod 50 is housed in the chuck 1 as shown in FIG. 3, the chuck 1 for gripping the pipe end P1 of the target pipe P is moved in the center axis direction I, and When the pipe end P1 is rotated around the core W, the final bent portion of the pipe end P1 of the target pipe P can be installed at an appropriate position with respect to the bending mold 2 in a required rotation posture.
[0013]
Then, in a state where the grip of the chuck 1 with respect to the pipe end P1 of the target pipe P is released, as shown in the figure, the chuck 1 is in the center axis direction I and at a non-interfering position J with the pressure base 4. When it is moved backward, the push rod 50 housed in the housing hole 1a of the chuck 1 as shown in FIG. At least the majority of the front end of the target pipe P is located at the rear part of the pipe end P1 and the front part F outside the chuck 1, and is left behind.
That is, at the time of bending the final bent portion of the pipe end P1 of the target pipe P, the push rod 50 includes the pipe end P1 of the target pipe P and the plurality of gripping claws 1A of the chuck 1 provided at the front end of the chuck 1. Is interpolated to Further, the distal end side of the mandrel 51 follows the rotation of the pipe end P1 around the center axis W so as to easily and quickly perform the bending process on the expected bending portion on the final stage side of the target pipe P. A plurality of parts, the ends of which are divided so that they can be bent, are connected.
[0014]
Then, the gripping claw 1A of the chuck 1 provided so as to be able to be pressed in the center axis direction I causes the tube end P1 of the target pipe P to be moved together with the chuck 1 by a driving cylinder 54 as a common driving source via a push rod 50. As described above, the clamp table 3 is rotated integrally with the bending die 2 toward the side away from the pressure table 4 while being pressed in the center axis direction I to bend the target pipe P into the final portion to be bent. Processing can be performed.
Reference numeral 55 denotes two chains as rotating passive parts which are locked to a base B on which the chuck 1 is mounted and are suspended on a base K via sprockets 56 and 57 in a longitudinal direction. The base B provided with the chuck 1 cooperates with the driving of the driving cylinder 54 by the engagement of the sprockets 56 mounted on the motor shafts of the motors M provided on the gantry K. Guided to.
In the drawing, reference numeral 58 denotes a cylinder provided on the base B for projecting at least most of the front part of the push rod 50 from the chuck 1, and reference numeral 59 denotes a cylinder for opening and closing the gripper 1 </ b> A of the chuck 1. .
[0015]
One embodiment of the bender according to the present invention has the above-described configuration. In order to perform the bending process on the final bent portion of the target pipe P, first, the chuck 1 in a state where the push rod 50 is housed in the housing hole 1a. When the driving cylinder 54 is driven in a state where the pipe end P1 of the target pipe P is gripped by the gripping claw 1A, and the driving cylinder 54 is driven in this way, the mount K is prepared. The bases B are moved in the center axis direction I by rotating the chains 55, 55 by the sprockets 56, 56 mounted on the motor shaft by driving the motors M, M.
[0016]
At this time, a final bent portion of the pipe end P1 of the target pipe P is set at an appropriate position with respect to the bending mold 2 in a required rotation posture. Moreover, the push rod 50 accommodated in the accommodation hole 1a provided in the chuck 1 has a locking step as an engaging portion 52A at its tip, so that the target pipe P can be moved in the center axis direction. When it moves to I, this locking step is easily locked in the pipe end P1 of the target pipe P, and becomes integral with the target pipe P.
[0017]
Next, when the gripping of the chuck 1 by the gripping claws 1A with respect to the pipe end P1 of the target pipe P is released and loosened, the driving cylinder 54 is driven, and the motors M, M are driven to rotate the chains 55, 55. By driving, the chuck 1 is moved backward in the center axis direction I and to the non-interfering position J with the pressure base 4 for each base B.
[0018]
Then, when the chuck 1 is moved backward to the center axis direction I and to the non-interfering position J with the pressure table 4, the pressure table 4 is closed, and the clamp table 3 closes the pipe end P1 of the target pipe P. And hold the portion to be bent.
[0019]
In this manner, when the chuck 1 is moved backward in the center axis direction I to the non-interfering position J with the pressure table 4, the push rod 50 housed in the housing hole 1a of the chuck 1 is engaged with the push rod 50 provided at the front end thereof. By locking the joint 52A into the pipe end P1 of the target pipe P as described above, at least most of the front portion of the chuck 1 comes out of the housing hole 1a (see FIGS. 3 and 4). Moreover, the gripper claw 1A of the chuck 1 with respect to the push rod 50 has a first outer flange portion 52B formed at an intermediate portion thereof with respect to the push rod 50 and a second claw formed at a rear end of the push rod 50. It is located between the outer flange portion 52C and the second mandrel 51 and left.
[0020]
Then, after the push rod 50 is largely out of the accommodation hole 1a of the chuck 1 and is left between the push rod 50 and the pipe end P1 of the target pipe P, the cylinder 59 is driven to hold the chuck 1. When the claw 1A is closed, the gripping claw 1A is locked by a first outer flange portion 52B formed at an intermediate portion of the push rod 50, thereby gripping the push rod 50 and a second pin provided at the rear end of the push rod 50. The second outer flange 52C is engaged with the second outer flange 52C (see FIG. 4).
[0021]
Thereafter, when the chuck 1 is advanced from when the driving cylinder 54 as a common driving source is driven and when the motors M, M are driven, the gripping claws 1A of the chuck 1 are moved to the first outer flange portion. Since the pipe end P1 of the target pipe P is pressed in the center axis direction I via the push rod 50 engaged with 52B, the clamp base 3 is integrally formed with the bending mold 2 on the side away from the pressure base 4. By being rotated, a bending process is performed on the final bent portion of the pipe end P1 of the target pipe P.
[0022]
Thereafter, the chuck 1 retreats when the driving cylinder 54 as a common driving source is driven again, and when the motors M, M rotate and the chains 55, 55 rotate and move. Then, when the cylinder 59 is driven to open the gripping claw 1A, the mandrel 51 inserted into the final bent portion of the target pipe P retreats inside the target pipe P and the push rod 50. Since the front end of the push rod 50 is engaged with the swelling engagement shoulder 51a provided on the front end side of the mandrel 51, the gripping claw 1A is opened with the retreat of the mandrel 51. The mandrel 51 retracts and retracts it into the receiving hole 1 a of the chuck 1 until it comes into contact with the stopper 53, returns to the previous position, and prepares for the next-stage bending of the target pipe P in the next period.
[0023]
As described above, in the conventional pipe bender described in Patent Literature 1, the pipe bender of the present embodiment performs the final bending of the target pipe with respect to the bending mold when performing bending on the final bending portion of the target pipe. The bending section is positioned at an appropriate position, and then the chuck for the pipe end of the pipe is released by driving the claw opening / closing cylinder to drive the driving cylinder to move the chuck in the direction of its center axis. After retreating to the non-interfering position with the pressure table, the clamping cylinder and the pressure table are used to hold the final bendable portion by clamping, and the driving cylinder is provided separately from the driving cylinder. The pipe end of the target pipe is pressed and urged by the retractable rod-shaped tool which has been switched to the operating state by the driving operation, and the final bent portion of the target pipe is bent. Differently from this, the push rod 50 accommodated in the chuck 1 is connected to the pipe end P1 of the target pipe P and the push rod 50 left at least for the most part in front of the chuck 1 at the front outside the chuck 1. The clamp table 3 is rotated integrally with the bending mold 2 toward the side away from the pressure table 4 while pressing the target pipe P by the chuck 1 via the chuck 1 to perform bending on the final portion to be bent of the target pipe P. Has adopted.
[0024]
Therefore, in the pipe bender of the present embodiment, the target pipe is moved by the retractable rod-shaped tool which is switched to the operating state by driving the retracting operation cylinder provided separately from the driving cylinder as in Patent Document 1. Instead of pressing and urging the pipe end, by driving the cylinder 58, at least the majority of the push rod 50 at the front is projected between the pipe end P1 of the target pipe P and the outside of the chuck 1. Alternatively, the target pipe P is accommodated in the accommodation hole 1a of the chuck 1, and the target pipe P is moved in the center axis direction I via the push rod 50 to bend the final planned bending portion. The number of steps for performing the bending process on the portion to be bent is omitted without complicating the process, and the bending process on the final portion to be bent can be performed quickly, efficiently, and reliably. Further, in the present embodiment, when the pipe end P1 is pressed and moved by the push rod 50 in performing the final bending of the target pipe P, the push rod 50 is at least mostly moved forward with respect to the chuck 1. However, the present invention is not limited thereto, and the present invention can be applied to a case where the push rod 50 is completely protruded in front of the chuck 1 and then pressed at the front end of the chuck 1. Range.
[0025]
The forward and backward movement of the chuck 1 and the pressing operation required for the final bending of the target pipe P are performed by driving one drive cylinder 54 as a common drive source. The motors M, M provided on the gantry K are driven in cooperation with the driving of the chuck K, and the chains 55, 55 are rotated and moved by the sprockets 56, 56 mounted on the motor shaft, thereby reliably guiding the chuck 1 to move. Therefore, the power consumption required for the operation of the motors M, M can be reduced, and the capacity of this motor can be reduced, so that the structure and control system are simplified, the number of parts is reduced, and the production and assembly are simplified. It becomes easy, and the manufacturing cost, equipment cost, etc. become low.
[0026]
【The invention's effect】
As described above, the invention according to claim 1 of the present invention provides a bending die having a chuck for gripping a pipe end of a target pipe from an outer peripheral side and an arc-shaped portion for bending guide to a bending portion of the target pipe. And a clamp table for holding a bending portion of the target pipe between the bending mold and the bending die, and pressing the bending portion of the target pipe between the bending die and the chuck portion of the clamp table. And a pressure base for holding, and among a plurality of planned bending portions arranged in the pipe core direction of the target pipe, a pipe bending portion other than a final bending portion located near the pipe end on the chuck side is a pipe pipe end portion. The chuck having gripped is moved in the direction of the center axis and rotated around the center axis to position the portion to be bent at an appropriate position with respect to the bending die in a required rotation posture, and The pressure table and In a state in which the portion to be bent is held in a pinch state, the chuck end gripping the pipe end of the target pipe is pressed against the pipe end of the target pipe in the direction of the center axis, and the clamp table is pressed with the bending die. In a pipe bender which integrally bends a portion to be bent by rotating to a side away from the pressure base,
A push rod is provided so as to be insertable into and removable from the chuck. The push rod is housed in the chuck, and the chuck for gripping the pipe pipe end is moved in the direction of the center axis and rotated around the center axis. It is provided so as to be able to be installed at an appropriate position with respect to the bending die in a required rotation posture at a final bending portion of the pipe pipe end by being moved,
When the chuck is retracted in the center axis direction and to a position where it does not interfere with the pressure base in a state where the grip of the pipe tube end is released, the push housed in the chuck is The rod is located at least in front of the pipe end of the target pipe and the outside of the chuck at least for the most part and is left behind, so that the chuck pushes the pipe end of the target pipe by the chuck via the push rod. The clamp base is rotated integrally with the bending die toward a side away from the pressure base to perform a bending process on a final bent portion of the target pipe, and the present invention is also characterized in that the present invention is characterized in that: The invention of the present invention is directed to a chuck for gripping a pipe end of an object pipe from an outer peripheral side, a bending die having an arc-shaped portion for guiding a bent portion of the object pipe to be bent, and an object pipe. A clamp base for holding a portion to be bent of the pipe between the bending die and a pressure, the pressure being located on the chuck side of the clamp base and holding the portion to be bent of the target pipe to the bending die; A base and a plurality of scheduled bending portions arranged in the pipe core direction of the target pipe, among the scheduled bending portions other than the final scheduled bending portion located near the chuck-side pipe end, gripped the pipe pipe end. The chuck is moved in the direction of the center axis and rotated around the center axis to position the portion to be bent at an appropriate position with respect to the bending mold in a required rotation posture, and the clamp table and the pressure table are The clamping table is integrally formed with the bending die while pressing and urging the pipe end of the target pipe with the chuck for gripping the pipe end of the target pipe while holding the portion to be bent by pinching. In the pipe bending method spaced side is rotated subjected to bending a portion to be bent from,
In the bending process of the final bent portion of the target pipe, the chuck for gripping the pipe pipe end in a state where the push rod is housed in the chuck so that it can be inserted and removed is moved in the center axis direction and the center axis is A state in which the gripping of the chuck to the pipe tube end is released after the final planned bending portion of the pipe tube end is set at a proper rotation position with respect to the bending die by rotating the pipe tube around. By pushing the chuck back in the center axis direction and to a position where the chuck does not interfere with the pressure base, the push rod accommodated in the chuck is moved toward the pipe end of the target pipe and the outside front of the chuck. At least the majority of the front is located and left behind, and then clamped by the chuck via the push rod by the clamp and pressure bases. Since the clamp table is rotated integrally with the bending mold toward the side away from the pressure table while pressing the pipe in the direction of the center axis, bending is performed on the final bent portion, so that the object is bent. Since the number of steps for bending the final bent portion of the pipe is omitted, the final bent portion can be bent quickly and efficiently. Also, the power consumption of the motor required to move the chuck in the axial direction is reduced, and the structure and control system are simplified, and the number of parts is reduced. Equipment costs are reduced.
[0027]
Further, in the invention according to claim 2 of the present invention, the push rod according to claim 1 is arranged such that the push rod and the rear end of the pipe end of the target pipe are chucked at the time of bending the final scheduled bending portion of the pipe end of the target pipe. The chuck is provided so as to be able to be pressed in the center axis direction by being disposed on the gripping claw of the chuck provided at the front end of the chuck, and is pressed in the center axis direction by the common driving source together with the chuck by the gripping claw of the chuck. Since the final bent portion of the target pipe is rotated integrally with the bending die toward the side away from the pusher base and the final bent portion is bent, the final bending of the target pipe is performed. The number of steps for bending the planned portion is omitted without complicating the process, and the bending of the final bent portion can be performed quickly, efficiently, and reliably.
The forward and backward movement of the chuck and the pressing operation required for the final bending of the target pipe are performed by driving one drive cylinder as a common drive source, and the drive cylinder is driven. This is done by driving a motor that rotates and moves the chain provided on the gantry in cooperation with, so that the power consumption required for operating the motor can be reduced and the motor can be reduced in capacity. The system is simplified, the number of parts is reduced, manufacturing and assembly are easy, and manufacturing costs, equipment costs, and the like are low.
[0028]
According to a third aspect of the present invention, in the first or second aspect, the push rod is formed in a substantially cylindrical shape as a whole, and can be accommodated in an accommodation hole provided in a chuck at normal times. A mandrel that can be accommodated and inserted into the pipe end of the target pipe is movably inserted in the center axis direction, and a front end of the mandrel is formed on the front end side of the mandrel when the chuck is moved backward. The front end has a detachable engaging portion formed at the pipe end of the target pipe, and the outer end of the intermediate portion is engageable with a gripping claw of the chuck when the chuck is pressed. 1 is formed, and a second outer flange which is slidably contactable with the stopper when housed in the push rod in the accommodation hole is formed at the rear end. Bending of the final scheduled bending part at the end of the pipe of the target pipe During processing, a common drive for pressing the pipe end of the target pipe via a push rod between the rear end of the pipe end of the target pipe and the chuck, or accommodating the push rod in the accommodation hole of the chuck This can be ensured by driving one drive cylinder as a source.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a pipe bender according to the present invention, in which a final bending portion of a target pipe is bent.
FIG. 2 is a cross-sectional view showing a state in which the pipe end of the target pipe is pressed in the center axis direction via a push rod.
FIG. 3 is an enlarged sectional view showing a push rod housed in a chuck.
FIG. 4 is an enlarged sectional view showing a state in which the pipe end of the target pipe is pressed in the direction of the center axis through a push rod.
FIG. 5 is a side view showing the entire configuration of the pipe bender of the present invention.
FIG. 6 is a plan view of the same.
FIG. 7 is a side view of the same.
FIG. 8 is a perspective view of the same.
[Explanation of symbols]
1 chuck
1A gripping claw
2 bending mold
2m arc-shaped part
3 Clamp table
4 Pressure stand
50 push rod
51 Mandrel
51a engaging shoulder
52A engaging part
52B First outer collar
52C second outer collar
53 Stopper
54 Drive cylinder
58 cylinders
59 cylinder

Claims

A chuck that grips the pipe end of the target pipe from the outer peripheral side, a bending mold that forms an arc-shaped portion for bending guidance with respect to a bending target portion of the target pipe, and a bending die that is configured to bend the target pipe with the bending die. A clamping table for holding the clamping pressure, and a pressure table positioned on the chuck side of the clamping table for clamping and holding a portion to be bent of the target pipe between the bending die, and are arranged in the pipe core direction of the target pipe. Of the plurality of to-be-bent portions, for the to-be-bent portion other than the final to-be-bent portion located near the chuck-side pipe end, the chuck holding the pipe tube end is moved in the center axis direction thereof. By rotating around the center axis, the intended bending portion is positioned at an appropriate position with respect to the bending mold in a required rotating posture, and in a state where the intended bending portion is clamped and held by the clamp table and the pressure table, Target PA The clamp base is rotated integrally with the bending die toward the side away from the pressure base while the tube end of the target pipe is pressed and urged in the center axis direction by the chuck for gripping the pipe end of the clamp. In a pipe bender that bends the part to be bent,
A push rod is provided so as to be insertable into and removable from the chuck. The push rod is housed in the chuck, and the chuck for gripping the pipe pipe end is moved in the direction of the center axis and rotated around the center axis. It is provided so as to be able to be installed at an appropriate position with respect to the bending die in a required rotation posture at a final bending portion of the pipe pipe end by being moved,
When the chuck is retracted in the center axis direction and to a position where it does not interfere with the pressure base in a state where the grip of the pipe tube end is released, the push housed in the chuck is The rod is located at least in front of the pipe end of the target pipe and the outside of the chuck at least for the most part and is left behind, so that the chuck pushes the pipe end of the target pipe by the chuck via the push rod. A pipe bender, wherein a clamp table is rotated integrally with the bending die in a direction away from the pressure table to perform a bending process on a final bent portion of the target pipe.

The push rod is disposed at the rear end of the pipe end of the target pipe and at the gripping claw of the chuck provided at the front end of the chuck at the time of bending the final scheduled bending portion of the pipe end of the target pipe, thereby holding the chuck. It is provided so as to be freely pressable in the axial direction, and is pressed in the axial direction by a common driving source together with the chuck by the gripping claws of the chuck so that the final bent portion of the target pipe is separated from the pusher base integrally with the bending mold. 2. The pipe bender according to claim 1, wherein the pipe bender is turned to the side to perform a bending process on a final portion to be bent. 3.

The push rod is formed in a substantially cylindrical shape as a whole, and is normally housed in a housing hole provided in the chuck, and a mandrel that can be inserted into the pipe end of the target pipe is movable in the center axis direction. The front end of the mandrel is provided with an expanding engagement shoulder formed on the distal end side of the mandrel when the chuck is moved backward, and the front end is engaged with the pipe end of the target pipe. The outer periphery of the middle portion is formed with a first outer flange portion with which the gripper of the chuck can be engaged when the chuck is pressed, and the rear end is slidable when the push rod is stored in the receiving hole. The pipe bender according to claim 1, wherein a second outer flange portion that can contact the stopper is formed on the pipe bender.

A chuck that grips the pipe end of the target pipe from the outer peripheral side, a bending mold that forms an arc-shaped portion for bending guidance with respect to a bending target portion of the target pipe, and a bending die that is configured to bend the target pipe with the bending die. A clamping table for holding the clamping pressure, and a pressure table positioned on the chuck side of the clamping table for clamping and holding a portion to be bent of the target pipe between the bending die, and are arranged in the pipe core direction of the target pipe. Of the plurality of to-be-bent portions, for the to-be-bent portion other than the final to-be-bent portion located near the chuck-side pipe end, the chuck holding the pipe pipe end is moved in the direction of its central axis and the center is moved. By rotating about the axis, the intended bending portion is positioned at an appropriate position with respect to the bending die in a required rotating posture, and the object to be bent is held in a state where the intended bending portion is clamped and held by the clamp table and the pressure table. pie While pressing and energizing the pipe end of the target pipe by the chuck that grips the pipe end, the clamp table is rotated integrally with the bending die toward the side away from the pressure table to form a bent section. In a pipe bending method for performing a bending process,
In the bending process of the final bent portion of the target pipe, the chuck for gripping the pipe pipe end in a state where the push rod is housed in the chuck so that it can be inserted and removed is moved in the center axis direction and the center axis is A state in which the gripping of the chuck to the pipe tube end is released after the final planned bending portion of the pipe tube end is set at a proper rotation position with respect to the bending die by rotating the pipe tube around. By pushing the chuck back in the center axis direction and to a position where the chuck does not interfere with the pressure base, the push rod accommodated in the chuck is moved toward the pipe end of the target pipe and the outside front of the chuck. At least the majority of the front is located and left behind, and then clamped by the chuck via the push rod by the clamp and pressure bases. While pressing the pipe end in the direction of the center axis, the clamp table is rotated integrally with the bending die toward a side away from the pressure table to perform bending on the final bending portion. Pipe bending method.