JP3773613B2

JP3773613B2 - Circular tubular member, manufacturing method thereof and jig

Info

Publication number: JP3773613B2
Application number: JP01394497A
Authority: JP
Inventors: 富生鏡味
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 1997-01-28
Filing date: 1997-01-28
Publication date: 2006-05-10
Anticipated expiration: 2017-01-28
Also published as: JPH10211531A

Description

【０００１】
【発明の属する技術分野】
本発明は、ガスこんろ等の燃焼装置の装置内配管に用いられる金属製パイプ等の円管状部材、その製造方法及びその製造に用いられる治具に関する。
【０００２】
【従来の技術】
ガスこんろ等の燃焼装置の装置内配管用の円管状部材として、その一方の端部に平板状にかしめられた閉塞部が形成されている金属製パイプ部材が知られている。
【０００３】
例えば、図１示のパイプ部材１は、ガスこんろのハウジング２内に配設されるものであって、パイプ部材１に溶接等により取着されたフランジ３を介してハウジング２に螺着されている。パイプ部材１の上面には、コック取付け板４が図示しないねじ切り孔部に溶接等により取着されており、コック取付け板４に図示しないガスコックがパイプ部材１に連通するように装着される。また、該ガスコックの下流には、さらに図示しないガスバーナが配設されている。
【０００４】
該ガスコックは、図示しない操作スイッチに連動して開閉することにより、前記ガスバーナに対する燃料ガスの供給を制御するようになっている。前記パイプ部材１は、接続用パイプ部材７を介して外部のガス管に接続され、前記ガスコックから前記ガスバーナに燃料ガスを供給するが、該燃料ガスの漏洩を防止するために、その一方の端部１ａに平板状にかしめられた閉塞部５が形成されている。
【０００５】
従来、前記パイプ部材１は、次のようにして製造されている。まず、金属製の長尺のパイプ部材から所定の長さに切り出されたパイプ部材１の一方の端部１ａを上下から加圧して平板状にかしめることにより閉塞部５が形成される。
【０００６】
前記一方の端部１ａが前記のようにかしめられて閉塞部５が形成された複数の前記パイプ部材１は、次いで所定の搬送容器に収容されて加工工程に搬送され、フランジ及びガスコック取付け用の下孔が穿設された後、該下孔にねじ切り加工を施すことにより前記ねじ切孔部が形成される。次いで、パイプ部材１の他方の端部１ｂの外周面に接続用パイプ部材７を螺着する接続部６が形成される。このとき、パイプ部材１が曲管である場合には、該パイプ部材１に所定の曲げ形状を付与する曲げ加工が施される。尚、前記ねじ切孔部の形成と、接続部６の形成及び曲げ加工とは逆の順序で行ってもよい。
【０００７】
次に、フランジ３を前記加工が施されたパイプ部材１に溶接等により取着すると共に、コック取付け板４を前記ねじ切孔部に溶接等により取着し、フランジ３及びコック取付け板４が取着されたパイプ部材１を所定の搬送容器に収容して表面処理工程に搬送し、塗装等の所定の表面処理を施す。そして、該表面処理の施されたパイプ部材１が台車に載置されて組立ラインに搬送され、前記ガスこんろ等の燃焼装置に組み込まれる。
【０００８】
しかしながら、前記従来のパイプ部材１は、前記加工工程において前記搬送容器から取り出す際に、チャッキングのミスによるトラブルが発生することがあるという不都合がある。
【０００９】
【発明が解決しようとする課題】
本発明は、かかる不都合を解消して、加工工程において搬送容器から取り出す際に、チャッキングのミスを生じることのない金属製の円管状部材を提供することを目的とする。
【００１０】
また、本発明の他の目的は、前記円管状部材の製造方法及び該製造方法に用いられる治具を提供することにもある。
【００１１】
【課題を解決するための手段】
本発明者は、前記不都合の原因について検討を重ねた結果、従来、前記パイプ部材１の閉塞部５は、一方の端部１ａを単に上下から加圧してかしめることにより形成されており、図８示のように閉塞部５の幅ｗ₂がパイプ部材１の外径ｒより大きく形成されているために、該閉塞部５の端部がパイプ部材１の外周面からはみ出し、前記加工工程に搬送する搬送容器に平積みにして収容すると、図９示のように、搬送容器８内で前記閉塞部５のパイプ部材１の外周面からはみ出した部分が相互に干渉したり他のパイプ部材１に当接したりして、複数のパイプ部材１が互いに斜めになるなど、乱雑に積み込まれることになることを見い出した。尚、図９は、簡単にするために複数のパイプ部材１を平面的に示しているが、実際には複数のパイプ部材１は立体的になっているので、相互の位置関係がさらに複雑なものとなる。
【００１２】
従って、前記のように搬送容器８に乱雑に積み込まれていて、他のパイプ部材１と平行に整列されていないパイプ部材１をチャッキングしようとするときに、前記ミスが生じるものと考えられる。
【００１３】
本発明は前記知見に基づくものであり、本発明の製造方法により得られる円管状部材は、一方の端部に平板状にかしめられた閉塞部が形成されている金属製の円管状部材であって、該閉塞部は該円管状部材の外径内に収容される形状を有する。本発明の製造方法により得られる円管状部材によれば、前記閉塞部が該円管状部材の外径内に収容されるようになっていて、該円管状部材の外周面からはみ出す部分がないので、搬送容器に平積みにして収容しても該閉塞部の端部が相互に干渉したり、他の円管状部材に当接したりすることを回避することができ、該搬送容器に収容される全ての円管状部材が互いに平行に整列されて載置される。従って、該パイプ部材１をチャッキングしようとするときに、前記ミスの発生を防止することができる。
【００１４】
前記構成を備える円管状部材は、金属製の円管状部材の一方の端部を相対向する平行な規制面の間で挟持して該端部の変形を該円管状部材の外径以下の所定の幅に規制する規制工程と、前記規制面と直交する方向に備えられた相対向する加圧面の間で、前記規制面の間に挟持されている前記円管状部材の端部を加圧して、前記所定の幅で平板状にかしめることにより、前記円管状部材の外径内に収容される形状を有する閉塞部を形成するかしめ工程とを備える製造方法により有利に製造することができる。
【００１５】
本発明の製造方法によれば、まず、前記規制工程において、前記円管状部材の一方の端部が前記規制面の間に挟持され、該端部の変形が該円管状部材の外径以下の所定の幅を超えないように規制される。次に、前記かしめ工程において、前記規制面の間に挟持されている前記円管状部材の端部を前記加圧面の間で加圧すると、該円管状部材の端部は該加圧面により平板状にかしめられるが、該端部はその変形が前記規制面により前記のように規制されているので前記所定の幅でかしめられ、前記円管状部材の外径内に収容される形状を有する閉塞部が形成される。
【００１６】
また、前記本発明の製造方法は、金属製の円管状部材の一方の端部が所定の位置に配置されるように該円管状部材を支持する支持手段と、相対向する平行な規制面を備え、該規制面の間で前記支持手段により支持される前記円管状部材の一方の端部を挟持して、該端部の変形をその外径以下の所定の幅に規制する規制手段と、前記規制面と直交する方向に相対向する平行な加圧面を備え、該加圧面の間で前記規制手段により挟持されている前記円管状部材の端部を加圧して、前記所定の幅で平板状にかしめることにより、前記円管状部材の外径内に収容される形状を有する閉塞部を形成するかしめ手段とを備える治具により有利に実施することができる。
【００１７】
本発明の治具によれば、前記円管状部材が前記支持手段に支持されることにより、その一方の端部が所定の位置に配置され、前記規制手段に挟持されることにより該端部の変形が該円管状部材の外径以下の所定の幅に規制される。そして、前記のように挟持されている前記円管状部材の一方の端部を、前記かしめ手段により加圧してかしめることにより、該端部が前記所定の幅で平板状にかしめられるが、該端部はその変形が前記規制手段により前記のように規制されているので、前記円管状部材の外径内に収容される形状を有する閉塞部を形成することができる。
【００１８】
【発明の実施の形態】
次に、添付の図面を参照しながら本発明の実施の形態についてさらに詳しく説明する。図１は本発明の円管状部材の一使用例を示す斜視図であり、図２は本発明の円管状部材の外形を示す斜視図である。
【００１９】
また、図３は本実施形態の円管状部材の製造装置を示す断面図であり、図４は図３のＩＶ−ＩＶ線断面図であり、図５は図３のＶ−Ｖ線断面図であり、図６は図５示の装置の作動説明図であり、図７は本発明の円管状部材を搬送容器に収容した状態を平面的に示す説明図である。
【００２０】
本実施形態のパイプ部材１は外径８．０〜２１．７ｍｍ、肉厚０．８〜２．０ｍｍの比較的小径薄肉であり、図１示のように、ガスこんろのハウジング２内に配設されて外部のガス管から供給される燃料ガスをガスバーナ（図示せず）に導くものであって、ハウジング２内の形状に適するように曲げられた曲管となっている。パイプ部材１は、溶接等により取着されたフランジ３を介してハウジング２に螺着されると共に、その上面には、コック取付け板４が図示しないねじ切り孔部に溶接等により取着されており、コック取付け板４に図示しないガスコックがパイプ部材１に連通するように装着されている。また、該ガスコックの下流には、さらに図示しないガスバーナが配設されている。コック取付け板４はハウジング２の左右両端近傍に位置するように各一対設けられ、前記ガスコックは図示しない操作スイッチに連動して開閉し、前記ガスバーナに対する燃料ガスの供給を制御するようになっている。
【００２１】
パイプ部材１は、その一方の端部１ａに平板状にかしめられて閉塞部５が形成されて、燃料ガスの漏洩を防止するようになっている。また、他方の端部１ｂの外周面には接続部６が形成されており、パイプ部材１と外部のガス管（図示せず）とを接続する接続用パイプ部材７が接続部６に螺着されるようになっている。
【００２２】
本実施形態のパイプ部材１は、図２示のように、その直径に沿って平板状の閉塞部５が形成されている。そして、該閉塞部５はその幅ｗ₁がパイプ部材１の外径ｒ以下になっていることにより、パイプ部材１の外径内に収容される形状となっている。
【００２３】
次に、本実施形態のパイプ部材１の製造に用いられる治具について説明する。
【００２４】
本実施形態の治具は、図３示の製造装置であり、ロッド１１に支持されて上下動自在に設けられたプレス部材１２と、プレス部材１２の下方に設けられた台座１３との間に、パイプ部材１を支持する支持手段１４と、支持手段１４により支持されるパイプ部材１の一方の端部１ａを挟持してその変形を所定の幅に規制する規制手段１５と、規制手段１５により挟持されているパイプ部材１の端部１ａを加圧し、平板状にかしめるかしめ手段１６とを備えている。
【００２５】
支持手段１４は、図３及び図４（ａ）示のように、上部支持部材１４ａと下部支持部材１４ｂとからなる。上部支持部材１４ａは、プレス部材１２の下方にスプリング取着部材１７を介して設けられた吊持部材１８の下端のフランジ部１８ａにその上端が係止されて吊持され、スプリング取着部材１７に取着されたスプリング１９，１９により下方に付勢されている。一方、下部支持部材１４ｂは、上方に大径部、下方に小径部を備えた貫通孔２０，２０が設けられており、該貫通孔２０，２０に挿入されたストリッパーボルト２１，２１によりスプリング２２，２２を介して台座１３に取着されている。下部支持部材１４ｂは、スプリング２２，２２により上方に付勢されているが、貫通孔２０の小径部がストリッパーボルト２１の頭部に係止されることにより、その上方位置が規制されている。そして、ロッド１１によりプレス部材１２が下降すると、支持部材１４ａ，１４ｂ間に形成される凹部２３にパイプ部材１を水平に挟持して、その一方の端部１ａが所定の位置に配置されるように支持するようになっている。
【００２６】
また、閉塞部５の加工途中から、上部支持部材１４ａと下部支持部材１４ｂとによる挟持が解除され、パイプ部材１が前方に逃げるようになっている。
【００２７】
また、規制手段１５は、図５示のように左右一対の規制部材１５ａ，１５ａからなり、規制部材１５ａ，１５ａはそれぞれ台座１３上に摺動自在に設けられた位置調整部材２４，２４にスプリング２５，２５を介して取着されたストリッパーボルト２６，２６の先端部に螺着されている。規制部材１５ａは、その後部上方に垂直方向に対して所定の角度で傾いた平面により構成されるカム面２７ａを備えており、該カム面２７ａに摺接するカム部材２８により前後進自在になっている。尚、位置調整部材２４の規制部材１５ａに対向する側面２４ａ及び規制部材１５ａのカム面２７ａに連接する側面２７ｂは、共に垂直に形成されている。
【００２８】
本実施形態の治具では、規制部材１５ａ，１５ａに対応して左右一対のカム部材２８，２８が設けられており、各カム部材２８は取着部材２９の下面に備えられたカム取着部材３０にスプリング３１を介して取着されたストリッパーボルト３２の先端部に螺着されて、取着部材２９の下面に沿って摺動自在に設けられている。また、カム部材２８は、位置調整部材２４の側面２４ａ及び規制部材１５ａの側面２７ａに摺接する垂直に形成された側面２８ａ，２８ｂを備え、側面２８ｂの下方に連接してカム２８ｃが形成されている。
【００２９】
カム部材２８は、図６示のようにロッド１１によりプレス部材１２を介して取着部材３２が下降せしめられると、カム２８ｃが規制部材１５ａのカム面２７ａに摺接しつつ、規制部材１５ａの側面２７ｂと位置調整部材２４の側面２４ａとの間隙に進入し、規制部材１５ａをパイプ部材１方向に前進させるようになっている。そして、規制部材１５ａ，１５ａのパイプ部材１に対向する面に相対向して垂直方向に平行に設けられた規制面３３，３３間で、パイプ部材１の端部１ａが挟持され、その変形がパイプ部材１の外径ｒ以下の所定の幅に規制されるようになっている。
【００３０】
また、位置調整部材２４は、台座１３上に設けられたエンド部材３４に備えられた調整ボルト３５により、その位置が調整できるようになっている。
【００３１】
かしめ手段１６は、図３及び図５示のように、支持手段１４の前方に設けられ、プレス部材１２の下方に取着部材２９を介して取着された上部潰し型１６ａと、台座１３上に固着された下部潰し型１６ｂとからなる。両潰し型１６ａ，１６ｂは相対向する平行な加圧面３４ａ，３４ｂを備えており、加圧面３４ａ，３４ｂは水平方向に平行に形成され、規制部材１５ａの規制面３３と直交するように形成されている。そして、前記支持部材１４に支持されたパイプ部材１の端部１ａは、加圧面３４ａ，３４ｂ間に配置にされるようになっている。
【００３２】
次に、前記治具を用いる本実施形態のパイプ部材１の製造方法について、説明する。
【００３３】
まず、金属製の長尺のパイプ部材から所定の長さに切り出されたパイプ部材１が図３示の製造装置に供給されると、ロッド１１によりプレス部材１２が下降し、吊持部材１８により吊持されスプリング１９により下方に付勢される上部支持部材１４ａと、台座１３上に設けられたスプリング２２により上方に付勢される下部支持部材１４ｂとの間にパイプ部材１が支持され、パイプ部材１の端部１ａが両潰し型１６ａ，１６ｂに備えられた加圧面３４ａ，３４ｂ間の所定の位置に配置にされる。
【００３４】
次に、ロッド１１によりプレス部材１２がさらに下降すると、図５示のように、取着部材２９の下面に備えられたカム部材２８がそのカム２８ｃを規制部材１５ａのカム面２７ａに摺接させつつ、規制部材１５ａの側面２７ｂと位置調整部材２４の側面２４ａとの間隙に進入することにより、規制部材１５ａをパイプ部材１方向に前進させる。この結果、パイプ部材１の端部１ａが、規制部材１５ａ，１５ａに相対向して設けられた垂直方向に平行な規制面３３，３３間で挟持される。
【００３５】
規制部材１５ａ，１５ａがパイプ部材１の端部１ａを前記のように押圧、挟持する位置まで前進すると、カム２８ｃとカム面２７ａとの摺接が解除され、カム部材２８はその両側面２８ａ，２８ｂがそれぞれ位置調整部材２４の側面２４ａと規制部材１５ａの側面２７ｂとに圧接する状態となる。そして、ロッド１１によりプレス部材１２がさらに下降するに従って、カム部材２８はその両側面２８ａ，２８ｂをそれぞれ位置調整部材２４の側面２４ａと規制部材１５ａの側面２７ｂとに摺接させて下降するが、このとき規制部材１５ａはパイプ部材１を前記のように押圧する位置以上には前進しない。
【００３６】
次に、ロッド１１によりプレス部材１２がさらに下降することにより、図６示のように、規制部材１５ａ，１５ａにより挟持されているパイプ部材１の端部１ａが、前記規制部材１５ａ，１５ａの規制方向と直交する方向に備えられた潰し型１６ａ，１６ｂの加圧面３４ａ，３４ｂ間で平板状にかしめられ、パイプ部材１の略中央部にその直径に沿って閉塞部５が形成される。このとき、規制部材１５ａは、調整ボルト３５により位置決めされた位置調整部材２４と、カム部材２８とにより、その位置が固定されている。従って、パイプ部材１の端部１ａは、前記のように規制面３３，３３間に挟持されて、その変形がパイプ部材１の外径ｒ以下の所定の幅に規制され、そのままの状態で潰し型１６ａ，１６ｂによりかしめられる。この結果、図２示のように、その幅ｗ₁がパイプ部材１の外径ｒ以下になっていて、パイプ部材１の外径内に収容される形状の閉塞部５が形成される。
【００３７】
前記のようにパイプ部材１の端部１ａが潰し型１６ａ，１６ｂによりかしめられる際に、支持手段１４はプレス部材１２の下降に伴ってその全体が初めの位置からやや下降するようになっており、閉塞部５が無理なくパイプ部材１の略中央部にその直径に沿って形成されるようになっている。
【００３８】
前記支持手段１４の作動について説明すると、図４（ｂ）示のように、プレス部材１２が下降すると、まず下部支持部材１４ｂが吊持部材１８の下面に押圧されスプリング２２の付勢力に抗して押し下げられる。また、上部支持部材１４ａは、その下面がストリッパーボルト２１の頭部に当接して吊持部材１８のフランジ部１８ａとの係止状態が解除される。そして、プレス部材１２の下降の途中から、上部支持部材１４ａと下部支持部材１４ｂとによる挟持が解除され、パイプ部材１が前方に逃げるようになっている。
【００３９】
従って、ストリッパーボルト２１，２１の頭部の上面を結ぶ線が下部潰し型１６ｂの加圧面３４ｂに略一致するレベルになるように調節しておくことにより、前記のようにパイプ部材１の直径に沿って閉塞部５を形成することができる。
【００４０】
また、本実施形態の治具によれば、前記のようにして閉塞部５が形成されると、直ちにロッド１１によりプレス部材１２が上昇せしめられる。すると、前述の逆の手順により、まず上部潰し型１６ａが上昇し、次いでカム部材２８が上昇する。カム部材２８の上昇に伴って、カム２８ｃがカム面２７ａに摺接するようになると、規制部材１５ａ，１５ａがスプリング２５の付勢力に従って左右に開いてパイプ部材１の挟持を解除する。また、カム部材２８はその上昇に伴い、スプリング３１の付勢力により取着部材２９の下面に沿って上部潰し型１６ａ方向に移動する。この結果、各部材が速やかに初期の位置に復帰するので、パイプ部材１の端部１ａを前記のようにかしめる加工を、ロッド１１の上下動により連続して行うことができる。
【００４１】
前記のようにして閉塞部５が形成されたパイプ部材１は、次いで図７示の搬送容器８に収容されて加工工程に搬送される。このとき、前記パイプ部材１によれば、図７示のように、閉塞部５の端部がパイプ部材１の外周面からはみ出して相互に干渉したり、他のパイプ部材１に当接したりすることがないので、複数のパイプ部材１を互いに平行に整列させて搬送容器８内に載置することができる。尚、図７は簡単にするために複数のパイプ部材１を平面的に示しているが、複数のパイプ部材１は実際の立体的配置においても、互いに平行に整列されていることは言うまでもない。
【００４２】
前記パイプ部材１は、以下、前記従来技術の場合と同様にして加工することができる。即ち、前記加工工程で図示しないねじ切孔部が形成され、端部１ｂの外周面に接続用パイプ部材７を螺着する接続部６が形成されたのち、該パイプ部材１に所定の曲げ形状を付与する曲げ加工が施される。前記ねじ切孔部の形成と、接続部６の形成及び曲げ加工とは逆の順序で行ってもよい。また、本実施形態のパイプ部材１は曲管であるので、前記加工工程に所定の曲げ形状を付与する曲げ加工が含まれるが、直管である場合には前記曲げ加工は必要がない。
【００４３】
次に、前記加工が施されたパイプ部材１にフランジ３及びコック取付け板４が溶接等により取着される。このとき、パイプ部材１にヘリウムガスを封入すると共に、その開口部を遮蔽し、パイプ部材１を水没させることにより前記溶接部及び閉塞部５のガス漏れ検査を行う。この検査によれば、前記溶接及び閉塞部５のかしめが不完全であるときにはその部分から気泡の発生が認められるので、容易にガス漏れ検査を行うことができる。
【００４４】
次に、前記ガス漏れ検査に合格したパイプ部材１を所定の搬送容器に収容して表面処理工程に搬送し、塗装等の所定の表面処理を施す。そして、該表面処理の施されたパイプ部材１が台車に載置されて組立ラインに搬送され、前記ガスこんろ等の燃焼装置に組み込まれる。
【００４５】
尚、本実施形態では、その幅ｗ₁がパイプ部材１の外径ｒ以下になっている閉塞部５をパイプ部材１の略中央部にその直径に沿って形成することにより、該閉塞部５がパイプ部材１の外径内に収容されるようにしているが、閉塞部５はパイプ部材１の外径内に収容される形状であればよく本実施形態の態様に限定されるものではない。
【００４６】
また、本実施形態のパイプ部材１では、図７示のように、閉塞部５の中央に引け部５ａが形成される。該引け部５ａはパイプ部材１の端部１ａが前記規制部材１５ａ，１５ａに挟持された状態で潰し型１６ａ，１６ｂにかしめられることにより不可避的に形成されるものでああるが、閉塞部５は燃焼ガスの漏洩を防止できるものであればよく、引け部５ａの存在は実用上何ら問題となるものではない。
【図面の簡単な説明】
【図１】本発明の円管状部材の一使用例を示す斜視図。
【図２】本発明の円管状部材の外形を示す斜視図。
【図３】本実施形態の円管状部材の製造装置を示す断面図。
【図４】図３のＩＶ−ＩＶ線断面図。
【図５】図３のＶ−Ｖ線断面図。
【図６】図５示の装置の作動説明図。
【図７】本発明の円管状部材を搬送容器に収容した状態を平面的に示す説明図。
【図８】従来の円管状部材の外形を示す斜視図。
【図９】従来の円管状部材を搬送容器に収容した状態を平面的に示す説明図。
【符号の説明】
１…円管状部材、５…閉塞部、１４…支持手段、１５…規制手段、１６…かしめ手段、３３…規制面、３４ａ，３４ｂ…加圧面。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tubular member such as a metal pipe used for piping in a combustion apparatus such as a gas stove, a manufacturing method thereof, and a jig used for manufacturing the same.
[0002]
[Prior art]
As a tubular member for piping in a combustion apparatus such as a gas stove, a metal pipe member is known in which a closed portion caulked in a flat plate shape is formed at one end thereof.
[0003]
For example, the pipe member 1 shown in FIG. 1 is disposed in a gas stove housing 2 and is screwed to the housing 2 via a flange 3 attached to the pipe member 1 by welding or the like. ing. On the upper surface of the pipe member 1, a cock mounting plate 4 is attached to a threaded hole portion (not shown) by welding or the like, and a gas cock (not shown) is attached to the cock mounting plate 4 so as to communicate with the pipe member 1. Further, a gas burner (not shown) is disposed downstream of the gas cock.
[0004]
The gas cock controls the supply of fuel gas to the gas burner by opening and closing in conjunction with an operation switch (not shown). The pipe member 1 is connected to an external gas pipe via a connecting pipe member 7 and supplies fuel gas from the gas cock to the gas burner. One end of the pipe member 1 is used to prevent leakage of the fuel gas. A closed portion 5 caulked in a flat plate shape is formed on the portion 1a.
[0005]
Conventionally, the pipe member 1 is manufactured as follows. First, the closed portion 5 is formed by pressurizing one end portion 1a of the pipe member 1 cut out from a long metal pipe member to a predetermined length from above and below and caulking it into a flat plate shape.
[0006]
The plurality of pipe members 1 in which the one end portion 1a is caulked as described above to form the closed portion 5 are then accommodated in a predetermined transport container and transported to a processing step for mounting a flange and a gas cock. After the lower hole is drilled, the threaded hole portion is formed by threading the lower hole. Next, a connection portion 6 is formed on the outer peripheral surface of the other end portion 1b of the pipe member 1 to which the connection pipe member 7 is screwed. At this time, when the pipe member 1 is a curved pipe, a bending process is performed to give the pipe member 1 a predetermined bending shape. The formation of the threaded hole portion and the formation and bending of the connection portion 6 may be performed in the reverse order.
[0007]
Next, the flange 3 is attached to the processed pipe member 1 by welding or the like, and the cock attachment plate 4 is attached to the threaded hole portion by welding or the like, so that the flange 3 and the cock attachment plate 4 are attached. The attached pipe member 1 is accommodated in a predetermined transport container and transported to a surface treatment process, and a predetermined surface treatment such as painting is performed. Then, the pipe member 1 subjected to the surface treatment is placed on a carriage, conveyed to an assembly line, and incorporated into a combustion apparatus such as the gas stove.
[0008]
However, the conventional pipe member 1 has a disadvantage that a trouble due to a chucking error may occur when the pipe member 1 is taken out from the transfer container in the processing step.
[0009]
[Problems to be solved by the invention]
An object of the present invention is to provide a metal tubular member that eliminates such inconvenience and does not cause a mistake in chucking when it is taken out from a transport container in a processing step.
[0010]
Another object of the present invention is to provide a manufacturing method of the tubular member and a jig used in the manufacturing method.
[0011]
[Means for Solving the Problems]
As a result of repeated studies on the cause of the inconvenience, the present inventor has conventionally formed the closed portion 5 of the pipe member 1 by simply pressurizing and crimping one end portion 1a from above and below. 8, the width w ₂ of the closed portion 5 is formed larger than the outer diameter r of the pipe member 1, so that the end portion of the closed portion 5 protrudes from the outer peripheral surface of the pipe member 1. When flattened and stored in a transport container to be transported, as shown in FIG. 9, the portions protruding from the outer peripheral surface of the pipe member 1 of the blocking portion 5 in the transport container 8 interfere with each other or other pipe members 1. It has been found that a plurality of pipe members 1 are loaded in a random manner such as in contact with each other. FIG. 9 shows a plurality of pipe members 1 in a plan view for the sake of simplicity. However, since the plurality of pipe members 1 are actually three-dimensional, the mutual positional relationship is more complicated. It will be a thing.
[0012]
Therefore, it is considered that the mistake occurs when trying to chuck the pipe member 1 that is randomly loaded in the transport container 8 as described above and is not aligned in parallel with the other pipe members 1.
[0013]
The present invention is based on the above knowledge, and the tubular member obtained by the production method of the present invention is a metal tubular member in which a closed portion caulked in a flat plate shape is formed at one end. Te, the closure unit that have a shape that is accommodated within the outer diameter of the circular tubular member. According to the tubular member obtained by the manufacturing method of the present invention, the closing portion is accommodated within the outer diameter of the tubular member, and there is no portion protruding from the outer peripheral surface of the tubular member. Even if the container is accommodated in a flat stack, it is possible to avoid the end portions of the closed portion from interfering with each other or coming into contact with other circular tubular members. All the tubular members are placed in parallel with each other. Therefore, the occurrence of the mistake can be prevented when trying to chuck the pipe member 1.
[0014]
Circular tubular member Ru provided with the configuration of not more than the outside diameter of the metallic circular tube one end of opposite circular tubular member deformation of the end portion is held between the parallel regulating surface of the member The end of the tubular member sandwiched between the restricting surfaces is pressed between a restricting step for restricting to a predetermined width and opposing pressurizing surfaces provided in a direction orthogonal to the restricting surface. Then, by caulking in a flat plate shape with the predetermined width, it can be advantageously manufactured by a manufacturing method including a caulking step for forming a closing portion having a shape accommodated in the outer diameter of the tubular member. .
[0015]
According to the manufacturing method of the present invention, first, in the restricting step, one end of the tubular member is sandwiched between the restricting surfaces, and the deformation of the end is equal to or less than the outer diameter of the tubular member. It is regulated not to exceed a predetermined width. Next, in the caulking step, when the end of the tubular member sandwiched between the regulating surfaces is pressed between the pressurizing surfaces, the end of the tubular member is flattened by the pressurizing surface. However, the deformation of the end portion is restricted by the restricting surface as described above, so that the end portion is caulked with the predetermined width and has a shape to be accommodated in the outer diameter of the tubular member. Is formed.
[0016]
Further, the manufacturing method of the present invention comprises a supporting means for supporting the tubular member so that one end portion of the metallic tubular member is disposed at a predetermined position, and parallel control surfaces facing each other. A regulating means for sandwiching one end of the tubular member supported by the supporting means between the regulating surfaces and regulating the deformation of the end to a predetermined width equal to or less than an outer diameter thereof; A parallel pressure surface facing the direction orthogonal to the regulation surface is provided, and an end of the tubular member sandwiched between the pressure surfaces by the regulation means is pressurized to form a flat plate with the predetermined width. By caulking in a shape, it can be advantageously carried out by a jig provided with caulking means for forming a closing portion having a shape accommodated in the outer diameter of the tubular member.
[0017]
According to the jig of the present invention, when the tubular member is supported by the support means, one end portion thereof is disposed at a predetermined position and is clamped by the restriction means, thereby Deformation is restricted to a predetermined width that is less than or equal to the outer diameter of the tubular member. And, by pressurizing and crimping one end portion of the tubular member sandwiched as described above by the caulking means, the end portion is caulked in a flat plate shape with the predetermined width. Since the deformation of the end portion is restricted as described above by the restricting means, a closed portion having a shape that can be accommodated within the outer diameter of the tubular member can be formed.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing an example of use of the tubular member of the present invention, and FIG. 2 is a perspective view showing the outer shape of the tubular member of the present invention.
[0019]
3 is a cross-sectional view showing the manufacturing apparatus of the tubular member of the present embodiment, FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is an operation explanatory diagram of the apparatus shown in FIG. 5, and FIG. 7 is an explanatory diagram showing a plan view of a state in which the tubular member of the present invention is accommodated in a transport container.
[0020]
The pipe member 1 of this embodiment is a comparatively small-diameter thin wall having an outer diameter of 8.0 to 21.7 mm and a wall thickness of 0.8 to 2.0 mm, and as shown in FIG. The fuel gas that is disposed and supplied from an external gas pipe is guided to a gas burner (not shown), and is a bent pipe that is bent so as to be suitable for the shape in the housing 2. The pipe member 1 is screwed to the housing 2 via a flange 3 attached by welding or the like, and a cock mounting plate 4 is attached to a threaded hole portion (not shown) on the upper surface thereof by welding or the like. A gas cock (not shown) is attached to the cock mounting plate 4 so as to communicate with the pipe member 1. Further, a gas burner (not shown) is disposed downstream of the gas cock. A pair of cock mounting plates 4 are provided so as to be positioned in the vicinity of the left and right ends of the housing 2, and the gas cocks are opened and closed in conjunction with an operation switch (not shown) to control the supply of fuel gas to the gas burner. .
[0021]
The pipe member 1 is caulked in a flat plate shape at one end 1a thereof to form a closed portion 5 so as to prevent fuel gas from leaking. Further, a connecting portion 6 is formed on the outer peripheral surface of the other end portion 1b, and a connecting pipe member 7 that connects the pipe member 1 and an external gas pipe (not shown) is screwed to the connecting portion 6. It has come to be.
[0022]
As shown in FIG. 2, the pipe member 1 of the present embodiment has a flat plate-like blocking portion 5 formed along its diameter. The closed portion 5 is shaped to be accommodated within the outer diameter of the pipe member 1 because the width w ₁ is equal to or smaller than the outer diameter r of the pipe member 1.
[0023]
Next, the jig | tool used for manufacture of the pipe member 1 of this embodiment is demonstrated.
[0024]
The jig of this embodiment is the manufacturing apparatus shown in FIG. 3, and is interposed between a press member 12 supported by a rod 11 and provided so as to freely move up and down, and a pedestal 13 provided below the press member 12. A support means 14 for supporting the pipe member 1, a restricting means 15 for sandwiching one end 1 a of the pipe member 1 supported by the support means 14 and restricting the deformation to a predetermined width, and a restricting means 15. A crimping means 16 is provided that pressurizes the end 1a of the sandwiched pipe member 1 and caulks it into a flat plate shape.
[0025]
As shown in FIGS. 3 and 4A, the support means 14 includes an upper support member 14a and a lower support member 14b. The upper support member 14 a is suspended and suspended by a flange portion 18 a at the lower end of a suspension member 18 provided below the press member 12 via a spring attachment member 17. Is urged downward by springs 19 attached to. On the other hand, the lower support member 14b is provided with through-holes 20 and 20 having a large-diameter portion on the upper side and a small-diameter portion on the lower side, and springs 22 by stripper bolts 21 and 21 inserted into the through-holes 20 and 20, respectively. , 22 to the pedestal 13. The lower support member 14 b is urged upward by the springs 22, 22, but the upper position of the lower support member 14 b is restricted by the small diameter portion of the through hole 20 being locked to the head of the stripper bolt 21. When the press member 12 is lowered by the rod 11, the pipe member 1 is horizontally held in the recess 23 formed between the support members 14a and 14b, and one end 1a thereof is arranged at a predetermined position. It comes to support.
[0026]
Further, the clamping by the upper support member 14a and the lower support member 14b is released from the middle of the processing of the closing portion 5, and the pipe member 1 is allowed to escape forward.
[0027]
Further, as shown in FIG. 5, the restricting means 15 is composed of a pair of left and right restricting members 15a and 15a. The restricting members 15a and 15a are spring-loaded to position adjusting members 24 and 24 that are slidably provided on the pedestal 13, respectively. The stripper bolts 26, 26 attached via 25, 25 are screwed onto the tip ends. The restricting member 15a includes a cam surface 27a formed by a plane inclined at a predetermined angle with respect to the vertical direction above the rear portion thereof, and can be moved forward and backward by a cam member 28 that is in sliding contact with the cam surface 27a. Yes. Note that the side surface 24a of the position adjusting member 24 facing the restricting member 15a and the side surface 27b of the restricting member 15a connected to the cam surface 27a are both formed vertically.
[0028]
In the jig of the present embodiment, a pair of left and right cam members 28, 28 are provided corresponding to the regulating members 15 a, 15 a, and each cam member 28 is a cam attachment member provided on the lower surface of the attachment member 29. The stripper bolt 32 is screwed to the tip of the stripper bolt 32 attached to the spring 30 and is provided slidably along the lower surface of the attachment member 29. The cam member 28 includes side surfaces 28a and 28b that are vertically formed to be in sliding contact with the side surface 24a of the position adjusting member 24 and the side surface 27a of the restricting member 15a, and a cam 28c is formed to be connected below the side surface 28b. Yes.
[0029]
As shown in FIG. 6, when the attachment member 32 is lowered by the rod 11 via the press member 12 as shown in FIG. 6, the cam 28c is in sliding contact with the cam surface 27a of the restriction member 15a, and the side surface of the restriction member 15a. 27b and the side surface 24a of the position adjusting member 24 are entered to advance the regulating member 15a in the pipe member 1 direction. And the edge part 1a of the pipe member 1 is clamped between the control surfaces 33 and 33 provided in parallel with the orthogonal | vertical direction opposite to the surface which opposes the pipe member 1 of the control members 15a and 15a, and the deformation | transformation is carried out. The pipe member 1 is restricted to a predetermined width equal to or smaller than the outer diameter r.
[0030]
Further, the position of the position adjusting member 24 can be adjusted by an adjusting bolt 35 provided on an end member 34 provided on the base 13.
[0031]
As shown in FIGS. 3 and 5, the caulking means 16 is provided in front of the support means 14, and is attached to the upper crushing die 16 a attached to the lower side of the press member 12 via the attachment member 29. And a lower crushing die 16b fixed to the bottom. Both crushing dies 16a and 16b are provided with parallel pressing surfaces 34a and 34b opposite to each other, and the pressing surfaces 34a and 34b are formed parallel to the horizontal direction and formed to be orthogonal to the regulation surface 33 of the regulation member 15a. ing. The end 1a of the pipe member 1 supported by the support member 14 is arranged between the pressurizing surfaces 34a and 34b.
[0032]
Next, the manufacturing method of the pipe member 1 of this embodiment using the said jig | tool is demonstrated.
[0033]
First, when the pipe member 1 cut out to a predetermined length from the long metal pipe member is supplied to the manufacturing apparatus shown in FIG. 3, the press member 12 is lowered by the rod 11, and the suspension member 18 The pipe member 1 is supported between an upper support member 14a that is suspended and urged downward by a spring 19 and a lower support member 14b that is urged upward by a spring 22 provided on the pedestal 13. The end portion 1a of the member 1 is arranged at a predetermined position between the pressing surfaces 34a and 34b provided in the both crushing dies 16a and 16b.
[0034]
Next, when the pressing member 12 is further lowered by the rod 11, as shown in FIG. 5, the cam member 28 provided on the lower surface of the attachment member 29 causes the cam 28c to slidably contact the cam surface 27a of the regulating member 15a. However, by entering the gap between the side surface 27b of the regulating member 15a and the side surface 24a of the position adjusting member 24, the regulating member 15a is advanced in the direction of the pipe member 1. As a result, the end 1a of the pipe member 1 is sandwiched between the regulating surfaces 33, 33 that are provided opposite to the regulating members 15a, 15a and are parallel to the vertical direction.
[0035]
When the restricting members 15a and 15a advance to the position where the end 1a of the pipe member 1 is pressed and clamped as described above, the sliding contact between the cam 28c and the cam surface 27a is released, and the cam member 28 has both side surfaces 28a, 28b will be in the state which press-contacts the side surface 24a of the position adjustment member 24, and the side surface 27b of the control member 15a, respectively. Then, as the press member 12 is further lowered by the rod 11, the cam member 28 is lowered while the side surfaces 28a and 28b thereof are in sliding contact with the side surface 24a of the position adjusting member 24 and the side surface 27b of the regulating member 15a, respectively. At this time, the regulating member 15a does not advance beyond the position where the pipe member 1 is pressed as described above.
[0036]
Next, when the press member 12 is further lowered by the rod 11, as shown in FIG. 6, the end portion 1a of the pipe member 1 sandwiched between the restricting members 15a and 15a is restricted by the restricting members 15a and 15a. The pressing surfaces 34a and 34b of the crushing molds 16a and 16b provided in a direction orthogonal to the direction are caulked in a flat plate shape, and a closed portion 5 is formed along the diameter at a substantially central portion of the pipe member 1. At this time, the position of the regulating member 15 a is fixed by the position adjusting member 24 positioned by the adjusting bolt 35 and the cam member 28. Therefore, the end portion 1a of the pipe member 1 is sandwiched between the restricting surfaces 33 and 33 as described above, and its deformation is restricted to a predetermined width equal to or smaller than the outer diameter r of the pipe member 1, and is crushed as it is. It is caulked by the molds 16a and 16b. As a result, as shown in FIG. 2, the width w ₁ is equal to or smaller than the outer diameter r of the pipe member 1, and the closed portion 5 having a shape accommodated within the outer diameter of the pipe member 1 is formed.
[0037]
As described above, when the end portion 1a of the pipe member 1 is caulked by the crushing dies 16a and 16b, the support means 14 is lowered slightly from the initial position as the press member 12 is lowered. The closing part 5 is formed without difficulty in the substantially central part of the pipe member 1 along the diameter thereof.
[0038]
The operation of the support means 14 will be described. As shown in FIG. 4B, when the press member 12 is lowered, the lower support member 14b is first pressed against the lower surface of the suspension member 18 to resist the urging force of the spring 22. Pushed down. Further, the lower surface of the upper support member 14 a comes into contact with the head of the stripper bolt 21, and the locked state with the flange portion 18 a of the suspension member 18 is released. In the middle of the lowering of the press member 12, the clamping by the upper support member 14a and the lower support member 14b is released, and the pipe member 1 is allowed to escape forward.
[0039]
Therefore, by adjusting the line connecting the upper surfaces of the heads of the stripper bolts 21 and 21 to a level substantially matching the pressing surface 34b of the lower crushing die 16b, the diameter of the pipe member 1 is adjusted as described above. The obstruction | occlusion part 5 can be formed along.
[0040]
Further, according to the jig of this embodiment, when the closing portion 5 is formed as described above, the press member 12 is immediately raised by the rod 11. Then, the upper crushing mold 16a is first lifted and then the cam member 28 is lifted by the reverse procedure described above. When the cam 28c comes into sliding contact with the cam surface 27a as the cam member 28 rises, the restricting members 15a and 15a open to the left and right according to the urging force of the spring 25 to release the pipe member 1. As the cam member 28 is raised, the cam member 28 moves in the direction of the upper crushing die 16 a along the lower surface of the attachment member 29 by the urging force of the spring 31. As a result, each member quickly returns to the initial position, so that the process of caulking the end 1a of the pipe member 1 as described above can be continuously performed by the vertical movement of the rod 11.
[0041]
The pipe member 1 in which the closing portion 5 is formed as described above is then accommodated in the transport container 8 shown in FIG. 7 and transported to the processing step. At this time, according to the pipe member 1, as shown in FIG. 7, the end portions of the blocking portion 5 protrude from the outer peripheral surface of the pipe member 1 and interfere with each other or come into contact with other pipe members 1. Therefore, the plurality of pipe members 1 can be placed in the transport container 8 while being aligned in parallel with each other. Although FIG. 7 shows a plurality of pipe members 1 in a plan view for the sake of simplicity, it goes without saying that the plurality of pipe members 1 are aligned in parallel with each other even in an actual three-dimensional arrangement.
[0042]
The pipe member 1 can be processed in the same manner as in the prior art. That is, a threaded hole portion (not shown) is formed in the machining step, and a connecting portion 6 for screwing the connecting pipe member 7 is formed on the outer peripheral surface of the end portion 1b, and then the pipe member 1 has a predetermined bent shape. The bending process to give is given. The formation of the threaded hole portion and the formation and bending of the connecting portion 6 may be performed in the reverse order. In addition, since the pipe member 1 of the present embodiment is a curved pipe, the machining process includes a bending process for imparting a predetermined bending shape. However, if the pipe member 1 is a straight pipe, the bending process is not necessary.
[0043]
Next, the flange 3 and the cock mounting plate 4 are attached to the pipe member 1 subjected to the above-described processing by welding or the like. At this time, helium gas is sealed in the pipe member 1, the opening thereof is shielded, and the pipe member 1 is submerged, whereby the welded portion and the closed portion 5 are inspected for gas leakage. According to this inspection, when the welding and the caulking of the closed portion 5 are incomplete, the generation of bubbles is recognized from that portion, so that the gas leakage inspection can be easily performed.
[0044]
Next, the pipe member 1 that has passed the gas leak inspection is accommodated in a predetermined transport container and transported to a surface treatment process, and a predetermined surface treatment such as coating is performed. Then, the pipe member 1 subjected to the surface treatment is placed on a carriage, conveyed to an assembly line, and incorporated into a combustion apparatus such as the gas stove.
[0045]
In the present embodiment, the closed portion 5 having a width w ₁ equal to or smaller than the outer diameter r of the pipe member 1 is formed in the substantially central portion of the pipe member 1 along the diameter thereof. Is accommodated within the outer diameter of the pipe member 1, but the closing portion 5 is not limited to the form of the present embodiment as long as it has a shape accommodated within the outer diameter of the pipe member 1. .
[0046]
Moreover, in the pipe member 1 of this embodiment, as shown in FIG. 7, a closing portion 5 a is formed at the center of the closing portion 5. The closing portion 5a is inevitably formed by caulking the crushing dies 16a and 16b with the end portion 1a of the pipe member 1 being sandwiched between the restricting members 15a and 15a. As long as the leakage of combustion gas can be prevented, the presence of the closing portion 5a is not a problem in practice.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of use of a circular tubular member of the present invention.
FIG. 2 is a perspective view showing an outer shape of a circular tubular member of the present invention.
FIG. 3 is a cross-sectional view showing an apparatus for manufacturing a circular tubular member according to the present embodiment.
4 is a sectional view taken along line IV-IV in FIG. 3;
5 is a cross-sectional view taken along line VV in FIG.
6 is an operation explanatory diagram of the apparatus shown in FIG. 5. FIG.
FIG. 7 is an explanatory view illustrating a state in which the tubular member of the present invention is accommodated in a transport container in a plan view.
FIG. 8 is a perspective view showing an outer shape of a conventional circular tubular member.
FIG. 9 is an explanatory view illustrating a state in which a conventional circular tubular member is accommodated in a transport container.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cylindrical member, 5 ... Closure part, 14 ... Support means, 15 ... Restriction means, 16 ... Caulking means, 33 ... Restriction surface, 34a, 34b ... Pressurization surface.

Claims

A regulating step of sandwiching one end of a metal tubular member between opposing parallel regulating surfaces to regulate the deformation of the end to a predetermined width equal to or less than the outer diameter of the tubular member;
Between the pressing surfaces facing each other in a direction orthogonal to the regulating surface, the end of the tubular member sandwiched between the regulating surfaces is pressurized to form a flat plate with the predetermined width And a caulking step for forming a closing portion having a shape accommodated within the outer diameter of the tubular member by caulking.

Supporting means for supporting the tubular member so that one end of the metallic tubular member is disposed at a predetermined position;
Opposite parallel restricting surfaces are provided, one end of the tubular member supported by the support means is sandwiched between the restricting surfaces, and the deformation of the end is not more than a predetermined outer diameter. Regulation means to regulate the width,
A parallel pressure surface facing the direction orthogonal to the regulation surface is provided, and an end of the tubular member sandwiched between the pressure surfaces by the regulation means is pressurized to form a flat plate with the predetermined width. A jig for manufacturing a tubular member, comprising: a caulking unit that forms a closing portion having a shape that is accommodated within an outer diameter of the tubular member by caulking in a shape.