JP4116723B2 - End forming method for tube material - Google Patents

End forming method for tube material Download PDF

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Publication number
JP4116723B2
JP4116723B2 JP37659798A JP37659798A JP4116723B2 JP 4116723 B2 JP4116723 B2 JP 4116723B2 JP 37659798 A JP37659798 A JP 37659798A JP 37659798 A JP37659798 A JP 37659798A JP 4116723 B2 JP4116723 B2 JP 4116723B2
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Japan
Prior art keywords
tube
bent
axis
roller
forming
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JP2000190038A (en
JP2000190038A5 (en
Inventor
入江  徹
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Sango Co Ltd
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Sango Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は管素材の端部成形方法関し、特に、円筒状の金属管素材の端部に屈曲縮径部を一体的に形成する端部成形方法係る。
【0002】
【従来の技術】
円筒状の金属管素材(以下管素材という)の端部に縮径部を形成する端部成形方法として、例えば実開昭61−110823号公報には、少くとも一方のコーン部と本体とを、管材を拡管又は縮管して一体に形成した触媒担体の保持ケースが開示され、筒部の開口端側の部分をケース本体部分を残してスピニング加工により縮管して他方のコーン部と更にこれに連なる導管とを一体に形成する方法が開示されている。また、特開平3−226327号公報には、パイプ素材をプレス型により軸方向に加圧して略円錐状に成形し、ついでパイプ素材を回転支持してその円錐状成形部分の外周面にスピニングロールを押し当ててスピニング加工する圧力容器等の口部成形方法が開示されている。
【0003】
【発明が解決しようとする課題】
ところで、自動車の消音器の排気系における触媒コンバータや消音器の外筒に関し、製造の容易さと車両搭載性の向上が企図され、これらを金属管素材から一体的に形成することが望まれている。このような状況下で、管素材の端部に形成する縮径部を、管素材の軸に対し傾斜させることが要請されている。
【0004】
然し乍ら、従来のスピニング加工による成形方法では、管素材に対し本体部と同軸の縮径部を形成するに留まり、本体部と縮径部が同軸でないときには、前掲の実開昭61−110823号公報の第1図の右側のコーン部(縮径部)のようにプレス加工で成形し、これをケース本体に溶接接合することとしていた。しかし、このような方法によって形成された管体は一体成形ほどの強度は望めず、また接合という異種作業を必要とすることから、製造が困難であり、スピニング加工によって成形された同軸型の管体に比し製造コストの上昇は不可避となる。
【0005】
そこで、本発明は、管素材の端部に、容易且つ適切に屈曲縮径部を一体的に形成し得る管素材の端部成形方法提供することを課題とする。
【0006】
【課題を解決するための手段】
上記課題を解決するため、本発明の管素材の端部成形方法は、請求項1に記載のように、管素材の端部を曲げ加工により屈曲して屈曲端部を形成し、該屈曲端部の軸と略同軸に主軸を配置し、該主軸に対し径方向に移動可能にローラを支持し、該ローラが前記屈曲端部に当接するように前記管素材を支持し、前記ローラを前記主軸に向かって径方向に駆動すると共に、前記ローラと前記管素材を相対的に回転駆動して前記管素材に対しスピニング加工を行ない、前記管素材の端部に、前記管素材に対し所定角度傾斜した前記屈曲端部の軸を中心とする縮径部を形成することとしたものである。
【0008】
前記管素材の端部成形方法において、請求項に記載のように、前記主軸から前記屈曲端部の軸に至るまで、前記ローラと前記管素材の相対的な回転駆動の回転軸が複数のサイクルで漸近するように設定し、各サイクル毎に前記ローラと前記管素材を相対的に回転駆動して前記管素材に対しスピニング加工を行なうこととしてもよい。
【0009】
更に、請求項1又は2に記載の管素材の端部成形方法において、請求項に記載のように、前記管素材の端部に前記屈曲端部を形成すると共に前記屈曲端部を縮径することとしてもよい。特に、請求項4に記載のように、前記管素材の端部を所定形状の型内に押圧挿入して前記屈曲端部を形成すると共に前記屈曲端部を縮径することとしてもよい。
【0016】
【発明の実施の形態】
上記の構成になる管素材の端部成形方法実施形態を図面を参照して説明する。図1乃至図3スピニング加工装置を示し、図4乃至図9に示す管素材の端部成形方法における一工程として、図7のスピニング加工工程で用いられる。本実施形態の最終製品は、例えば自動車用の消音器の外筒(図示せず)、あるいは図10に示す触媒コンバータ等に供される。本実施形態において加工対象とする管素材はステンレススティール管であるが、これに限らず、他の金属管を用いることとしてもよい。
【0017】
先ず、本発明の一実施形態に係る管素材の端部成形方法を図4乃至図9を参照して工程順に説明する。本実施形態においては、スピニング加工に先立ち、図4乃至図6に示すように被加工部材たる管素材4に対し曲げ加工が行なわれる。図4は曲げ加工に用いる金型の一部を示すもので、下型80に上型(図示せず)が組み合わされたときに、円筒状のボアが形成されるように構成されている。この円筒状のボアは図6に示す加工目標の形状に形成され、図4の下型80側に形成された凹部81に示すように、曲げ加工後に管素材4の端部が屈曲されると共に縮径された所定の外形となるように形成されている。
【0018】
一方、本実施形態の管素材4は、曲げ加工後に開口端面が屈曲端部4fの軸と略直交するように、曲げ加工前の管素材4の両側の端部4eは図4に示すように相互に平行な傾斜面に形成されている。また、本実施形態の管素材4には予め触媒CAが収容されている。
【0019】
而して、下型80を有する金型によって形成される円筒状ボア(凹部81及び上型の凹部から成る)には、図4に示すように、触媒CAが収容された管素材4の一方の傾斜端部4eが、曲げ加工時の傾斜方向に対し略垂直となるように配置される。そして、管素材4が押圧、挿入されると、円筒状ボアの形状に沿って屈曲、縮径され、図5に示す屈曲端部4fが形成される。尚、金型は、本実施形態では上型及び下型の分割型としたが、一つのブロックにボアを穿設した一体型としてもよい。
【0020】
管素材4が金型から取り出されると、管素材4の端部には、図6に示すように管素材4の軸Xtに対して傾斜した軸Xfを中心とする屈曲端部4fが形成される。このとき、屈曲端部4fの開口端面は、その軸と略直交する面に形成されるので、加工後に屈曲端部4fの先端を切断する必要はない。この屈曲工程で形成される屈曲端部4fは滑らかな曲面となるので、湾曲部とも称呼し得るが、湾曲部としたときでも、その中心に管素材4の軸Xtに対して傾斜した軸Xfを有するということができる。尚、本実施形態では曲げ加工後に管素材4の端部が屈曲されると共に縮径され図6に示す外形となるが、縮径することなく屈曲のみとしてもよい。また、曲げ加工方法としては、図4乃至図6に示す方法に限らず、例えばハイドロフォーミングや高周波加熱加工を用いることとしてもよい。
【0021】
この後、管素材4の屈曲端部4fに対し図7に示すようにスピニング加工が行なわれ、管素材4の一端側にテーパ部4bと首部4cから成る屈曲縮径部が形成されるが、これについては後述する。続いて、図8に示すように管素材4の他端側に対し同様の加工が行なわれ、図9に示す触媒コンバータが形成される。尚、図9の触媒コンバータは概略的に示したものであるが、加工後の具体的な外形の一例を示すと図10に示す形状となる。而して、図4乃至図9に示す工程に従って形成された例えば2個の触媒コンバータ4x,4yを並設し、図10に示す自動車の排気装置を構成することができる。
【0022】
次に、上記図7の工程で使用されるスピニング加工装置の構成を図1乃至図3を参照して説明すると、図1に示すように、ベースBS上に、本発明の第1の駆動手段たる第1の駆動機構1、第2の駆動手段たる第2の駆動機構2及び第3の駆動手段たる第3の駆動機構3が構成されている。前述のように管素材4には屈曲端部4fが形成されており、管素材4の軸Xtと、これに対し傾斜した屈曲端部4fの軸Xfによって形成される面がベ一スBSと平行になるように管素材4が支持される。
【0023】
第1の駆動機構1においては、図1及び図2に示すように管素材4の屈曲端部4fの軸XfがX軸となるように(図1では管素材4の軸Xtと屈曲端部4fの軸Xfは同一面上にあるので一致している)、これと平行に一対のX軸ガイドレール5がベ−スBS上の一方側(図1の右側)に固定され、このX軸ガイドレール5に沿って筐体20が移動可能に配置されている。この筐体20の下部にはボールソケット7が固定され、これに螺合する螺子軸8が、ベ−スBS上にX軸ガイドレール5と平行に配置され、サーボモータ9によって回動可能に支持されている。而して、サーボモータ9によって螺子軸8が回転駆動されると、筐体20はX軸に沿って移動するように構成されている。
【0024】
一方、ベ−スBSの他方側(図1の左側)には台1aが形成されており、X軸ガイドレール5と直交する一対のY軸ガイドレール10が台1a上に固定されている。これらのY軸ガイドレール10には一対のスライダ11が移動可能に配置され、これらのスライダ11上にクランプ装置12が支持されている。クランプ装置12は、スライダ11に固定される下側クランプ13と、その上方に配置される上側クランプ17を備え、これら下側クランプ13と上側クランプ17との間に管素材4が挟持される。下側クランプ13の下部にはボールソケット14(図2)が固定されており、これに螺合する螺子軸15が、台1a上にY軸ガイドレール10と平行に配置され、サーボモータ16によって回動可能に支持されている。而して、サーボモータ16によって螺子軸15が回転駆動されると、クランプ装置12はY軸に沿って移動するように構成されている。
【0025】
上側クランプ17の上部には駆動手段として、例えば油圧駆動のシリンダ18が配置され、これによって上側クランプ17が昇降駆動可能に支持されており、管素材4の装着及び取り外し時には上側クランプ17が上昇駆動される。そして、下側クランプ13の上面には半円筒のクランプ面が形成され、上側クランプ17の下面にも半円筒のクランプ面が形成されており、これらのクランプ面の間に管素材4が挟持されたときには、回転及び移動不能に保持されるように構成されている。また、クランプ装置12の筐体20と反対側にはストッパ19が配設されており、このストッパ19に一端部が衝合するように管素材4が配置される。ストッパ19はクランプ装置12と共に移動し得るように、下側クランプ13に装着されている。尚、ストッパ19を下側クランプ13に対しX軸方向に位置調節可能に構成すれば、管素材4の軸方向の位置決めを適切且つ容易に行なうことができる。
【0026】
而して、管素材4が下側クランプ13のクランプ面上で、ストッパ19に一端部が衝合するように配置された後、上側クランプ17が油圧シリンダ18によって下降駆動されると、管素材4は上側クランプ17と下側クランプ13の間の所定位置に保持される。このとき、図1に示すように、管素材4の軸Xt及び屈曲端部4fの軸Xfが後述する主軸21の軸Xrに対し、ベースBSと平行な同一平面上(ベースBSから同一の高さ)に位置するように構成されている。
【0027】
次に、第2の駆動機構2について説明すると、図1の右側に、主軸21が、管素材4の軸Xt及び屈曲端部4fの軸Xfに対してベースBSと平行な同一平面上に位置し、屈曲端部4fの軸Xfと略同軸上で管素材4に対向するように配置され、その軸Xrを中心にベアリング20a,20bを介して回動自在に筐体20に支持されている。主軸21は中空の円筒状の部材で形成され、その中空部に円筒状のカム軸23が収容され、後述する変速機構50に連結されている。更に、カム軸23の中空部を貫通するようにマンドレル40の連結棒41が軸方向に進退可能に支持されている。マンドレル40は管素材4の屈曲端部4fの開口端内側の形状に合致するように形成されている。連結棒41の基端部は進退駆動用のシリンダ42に支持され、シリンダ42はブラケット1cを介してベースBSに支持されている。
【0028】
主軸21は歯車列22aを介してプーリ22bに連結され、このプーリ22bがベルト(図示せず)を介して回転駆動手段のモータ等(図示せず)等に連結されており、主軸21はこのモータ等によって回転駆動される。一方、主軸21の先端にはフランジ24が固定されており、主軸21が回転駆動されるとフランジ24が軸Xrを中心に回転する。そして、このフランジ24に対して回動可能にカム軸23の先端部が支持されている。カム軸23の先端部にはカム板25が固定されており、カム板25はカム軸23と共に軸Xrを中心に回転駆動される。
【0029】
図3に示すように、カム板25には3条の螺旋状の案内溝25aが形成されており、これらの案内溝25aの各々に、カム板25の回転に伴い径方向に移動する案内ピン26が配置されている。これらの案内ピン26は3個の支持部材27に夫々保持されており、各支持部材27には、図1及び図2に示すようにローラ28が回動自在に支持されている。而して、主軸21が回転駆動されると、ローラ28が軸Xrを中心に回動すると共に、カム板25の回転に応じて支持部材27が径方向に駆動され、ローラ28が管素材4の軸Xrに対して近接、離隔するように駆動される。
【0030】
上記のカム軸23が連結される変速機構50は、撓み噛み合い式駆動装置を用いたもので、主軸21とカム軸23に夫々係合される一対の外輪51,52と、これらの内面に形成された同一の歯数の歯溝に噛合し、これらと異なる歯数の歯形が形成された可撓性の歯車輪53と、この歯車輪53を回動可能に支持し外輪51,52の歯溝と相対する2箇所で噛合するように配置するウェーブ形成輪54が設けられている。このウェーブ形成輪54は駆動用減速モータ55によって回転駆動される。外輪51,52は夫々支持歯車56,57に支持され、支持歯車56と噛合する駆動歯車58が主軸21に取付けられ、支持歯車57と噛合する従動歯車59がカム軸23に取付けられている。
【0031】
上記の撓み噛み合い式駆動装置は、例えば波動歯車装置( Harmonic Drive Systems, Inc. 社の登録商標「ハーモニックドライブ」)として知られているの作動原理の説明は省略するが、主軸21の回転駆動に応じて外輪51,52間に相対速度差が生ずる差動機構が構成されている。而して、主軸21が回転駆動されると、外輪51,52間の差動によりカム軸23を介してカム板25が回転駆動され、各支持部材27、ひいては各ローラ28が主軸21の軸Xrに対し径方向移動するように構成されている。
【0032】
尚、ローラ28は複数でなく一個としてもよいが、断続的な衝撃を和らげるためには複数とすることが望ましい。また、ローラ28は径方向に変位可能であればどのような移動経路としてもよい。ローラ28の駆動手段としては遊星歯車機構等、他の手段を用いることとしてもよい。
【0033】
次に、第3の駆動機構3について説明すると、図1の左側のテーブル6には例えばモータ31から成る回転駆動手段が埋設されており、このモータ31の出力軸31aが図1の上方、即ちベースBSに対し垂直方向に延出して下側クランプ13に係合し、この下側クランプ13を出力軸31aを中心に回転駆動し得るように構成されている。テーブル6の上面には、出力軸31aを中心とする円弧状の案内溝32が形成されており、この案内溝32に嵌合するガイドローラ33が下側クランプ13の下面に回動自在に支持されている。而して、下側クランプ13は案内溝32に沿って回動し、出力軸31aを中心として回転駆動される。
【0034】
尚、上記モータ9,16,31等及びシリンダ18等の各駆動手段はコントローラ(図示せず)に電気的に接続され、このコントローラから各駆動手段に対し制御信号が出力され、数値制御されるように構成されている。
【0035】
上記の構成に成るスピニング加工装置によって行われる管素材4の屈曲端部4fの縮径方法を説明すると、図1において、先ず上側クランプ17が上昇した状態で、下側クランプ13のクランプ面上に加工対象の管素材4が配置され、ストッパ19に当接した状態の所定位置でシリンダ18が駆動される。これにより、上側クランプ17が下降し、管素材4は下側クランプ13と上側クランプ17の間に挟持され、回転不能の状態で保持される。
【0036】
そして、テーブル6がY軸ガイドレール10に沿って駆動されると共に、モータ31の出力軸31aを中心に回転駆動され、図2に示すように管素材4の屈曲端部4fの軸Xfが主軸21の軸Xrと同軸となるように位置決めされる。このとき、各ローラ28は管素材4の屈曲端部4fの外径よりも外側に退避している。次に、筐体20がX軸ガイドレール5に沿って前進駆動され(図1及び図2の左方向に移動)、管素材4の先端から加工長後退した点に各ローラ28が位置した状態で停止される。換言すれば、各ローラ28は加工開始点に位置し、この位置が原位置に設定される。そして、マンドレル40が管素材4の屈曲端部4fの先端部開口内に位置するように前進駆動される。
【0037】
この状態から、主軸21が回転駆動され、各ローラ28が軸Xrを中心に回動すると共に、変速機構50を介してカム板25が回転駆動され、各ローラ28が主軸21の軸Xr方向に移動する。同時に、筐体20ひいては各ローラ28がX軸ガイドレール5に沿って後退駆動される(図1及び図2の右方向に移動)。これにより、各ローラ28は、管素材4の屈曲端部4fの外周面に圧接された状態で、それ自体回転すると共に軸Xrを中心に主軸21回りを回転しながら、軸Xr方向に径方向駆動され、スピニング加工が行なわれる。
【0038】
そして、各ローラ28が所定の移動量を越えて更に後退駆動されるときには、各ローラ28はその状態(所定量移動した位置)に保持される。従って、各ローラ28の後退駆動によって管素材4の先端部が塑性変形し、図7に示すようにテーパ部4bの最小径部に連続して管素材4の軸Xtに対し所定角度傾斜した軸Xfを中心とする円筒状の首部4cが形成される。この後、管素材4とローラ28が、原位置に復帰駆動され、上記の縮径作動の往動パスと共に1往復移動が1サイクルとされ、第1サイクルのスピニング加工が終了する。尚、本実施形態では説明の便宜上、往動パスにおける縮径作動のみを説明したが、復動パスにおいても同様の加工を行ない、1サイクル中の2パスともスピニング加工を行なうように設定することとすれば、加工効率が良好となる。また、ローラ28は、エネルギー効率やタクトタイムに鑑み、各サイクル毎に停止させることなく、連続して回転するように設定されている。
【0039】
而して、本実施形態の縮径加工によればローラ28が常に管素材4の屈曲端部4fの被加工面に接した状態で複数回の加工が行なわれるので、滑らかな加工面が得られるだけでなく、加工部の肉厚減少や偏肉が最小限に抑えられ、所望の強度が確保される。また、事前に曲げ加工が行なわれており、加工に無理がないので総合的な加工限界が向上する。しかも、ローラ28等に対する負荷が過大となることがないので、円滑に加工作業を行なうことができる。このため、大径の管素材に対しても容易に屈曲縮径部を形成することができる。
【0040】
また、マンドレル40の直径は、管素材4の加工後の首部4cの内径と等しい値に設定されており、仕上げ加工時には、首部4cがマンドレル40とローラ28に挟持された状態でスピニング加工が行なわれるので、首部4cを容易に滑らかな面に形成することができる。特に、管素材4の屈曲端部4fの軸Xfに沿ってスピニング加工が行なわれ、屈曲縮径部の開口端がその軸に対し略垂直のままに維持されるので、首部4cの先端を別途切断する等の加工を行なう必要はない。
【0041】
更に、管素材4の軸Xtに対する屈曲縮径部の軸Xfの傾斜角度を大きく形成する必要がある場合には、スピニング工程時に、あるいは更に1サイクル毎に、テーブル6をモータ31の出力軸31aを中心に所定角度回転させると共にY軸方向に所定距離移動させ、管素材4の軸Xtに対して所定角度傾斜した屈曲端部4fの軸Xfを主軸21の軸Xrと略同軸に配置してスピニング加工を行なうこととするとよい。これにより、管素材4の軸に対する屈曲縮径部の軸の傾斜角度が大きい場合でも、容易にスピニング加工を行なうことができる。
【0042】
尚、図1及び図2の実施形態においては筐体20がX軸に沿って駆動されると共に、管素材4がY軸に沿って駆動されることによって、両者が相対的に移動するように構成されているが、筐体20をベ一スBS上に固定し、管素材4をX軸及びY軸に沿って駆動するように構成してもよい。即ち、本発明の第1の駆動手段たる第1の駆動機構1を図1の左側に集中して配置することとしてもよい。
【0043】
また、図1及び図2に記載の実施形態においては、管素材4の軸Xtが主軸21の軸Xrに対し、ベースBSと平行な同一平面上に位置するように、ベースBSからの高さが固定されているが、管素材4の軸XtのベースBSからの高さを可変とし、主軸21の軸Xrに対し鉛直方向にも調整可能に構成してもよい。即ち、本実施形態は管素材4を鉛直方向に駆動する第4の駆動機構(図示せず)を付加することとすれば、調整が一層容易となる。
【0044】
【発明の効果】
本発明は上述のように構成されているので以下に記載の効果を奏する。即ち、請求項1記載の管素材の端部成形方法おいては、管素材の端部に予め曲げ加工によって屈曲端部が形成され、この屈曲端部に対し円滑且つ効率的にスピニング加工が行なわれるので、管素材の端部に、管素材に対し所定角度傾斜した屈曲縮径部を容易に一体的に形成することができ、縮径部に対し滑らかな加工面を確保することができる。従って、大径の管素材に対しても、屈曲縮径部を容易に形成することができ、高精度で所望の形状に形成することができる。特に、屈曲端部の軸に沿ってスピニング加工が行なわれるので、開口端が屈曲端部の軸に対し略垂直のままに維持されるので、別途切断加工等を行なう必要はなく、加工時間が短縮される。勿論、従来のような溶接等の接合作業が不要であるので、製造が容易であり製造コストを低減することができる。
【0046】
また、請求項2に記載の成形方法おいては、管素材の軸に対する屈曲縮径部の軸の傾斜角度が大きい場合でも、一層円滑にスピニング加工を行なうことができ、屈曲縮径部に対し滑らかな加工面を確保することができる。
【0047】
また、請求項3及び4に記載の成形方法よれば、管素材の端部に対し容易且つ安価に屈曲端部を形成することができる。
【図面の簡単な説明】
【図1】本発明の一実施形態に係るスピニング加工装置の一部を破断した状態を示す側面図である。
【図2】本発明の一実施形態に係るスピニング加工装置の一部を破断した状態を示す平面図である。
【図3】本発明の一実施形態におけるカム板及び支持部材を示す正面図である。
【図4】本発明の一実施形態に係る管素材の端部成形方法における曲げ加工工程を示す平面図である。
【図5】本発明の一実施形態に係る管素材の端部成形方法における曲げ加工工程を示す平面図である。
【図6】本発明の一実施形態に係る管素材の端部成形方法における曲げ加工後の管素材の状態を示す平面図である。
【図7】本発明の一実施形態に係る管素材の端部成形方法におけるスピニング加工工程示す平面図である。
【図8】本発明の一実施形態に係る管素材の端部成形方法における他方の端部に対する曲げ加工工程を示す平面図である。
【図9】本発明の一実施形態に係る管素材の端部成形方法における加工後の管素材の状態を示す平面図である。
【図10】本発明の一実施形態に係る管素材の端部成形方法によって成形した触媒コンバータ2個を並設した自動車の排気装置の一例を示す平面図である。
【符号の説明】
1 第1の駆動機構, 2 第2の駆動機構, 3 第3の駆動機構,
4 管素材, 4b テーパ部, 4c 首部, 4f 屈曲端部,
9,16,31,55 モータ, 18,25 シリンダ,
12 クランプ装置, 21 主軸, 28 ローラ,
32 案内溝, 33 ガイドローラ, 50 変速機構
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an end forming method of the pipe material, in particular, according to the end portion forming method for integrally forming a bend reduced diameter portion on the end portion of the cylindrical metal tube material.
[0002]
[Prior art]
As an end molding method for forming a reduced diameter portion at the end of a cylindrical metal tube material (hereinafter referred to as a tube material), for example, Japanese Utility Model Publication No. 61-110823 discloses at least one cone portion and a main body. A catalyst carrier holding case integrally formed by expanding or contracting a pipe material is disclosed, and the portion on the opening end side of the cylindrical portion is contracted by spinning while leaving the case main body portion, and further the other cone portion A method of integrally forming a conduit connected thereto is disclosed. Japanese Patent Laid-Open No. 3-226327 discloses that a pipe material is pressed in the axial direction by a press die to be formed into a substantially conical shape, and then the pipe material is rotatably supported and a spinning roll is formed on the outer peripheral surface of the conical formed portion. A method for forming a mouth portion of a pressure vessel or the like for spinning by pressing is disclosed.
[0003]
[Problems to be solved by the invention]
By the way, regarding the catalytic converter in the exhaust system of the silencer of an automobile and the outer cylinder of the silencer, it is intended to improve the ease of manufacture and the vehicle mountability, and it is desired to integrally form these from a metal tube material. . Under such circumstances, it is required to incline the reduced diameter portion formed at the end of the tube material with respect to the axis of the tube material.
[0004]
However, in the conventional forming method by spinning, the reduced diameter portion coaxial with the main body portion is formed on the tube material. When the main body portion and the reduced diameter portion are not coaxial, Japanese Utility Model Laid-Open No. 61-110823 described above. 1 was formed by press work like the cone portion (reduced diameter portion) on the right side of FIG. 1, and this was welded to the case body. However, the tube formed by such a method cannot be as strong as the integral molding, and requires a different operation of joining, so that it is difficult to manufacture, and a coaxial tube formed by spinning processing. The increase in manufacturing cost is inevitable compared to the body.
[0005]
Then, this invention makes it a subject to provide the edge part shaping | molding method of the pipe | tube raw material which can form a bending reduced diameter part integrally in the end part of a pipe | tube raw material easily and appropriately.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problem, the method for forming an end portion of a pipe material according to the present invention is configured to bend an end portion of the pipe material by bending to form a bent end portion, as described in claim 1, The main shaft is arranged substantially coaxially with the shaft of the section, the roller is supported so as to be movable in the radial direction with respect to the main shaft, the tube material is supported so that the roller contacts the bent end portion, and the roller is The tube material is driven in a radial direction toward the main shaft, and the roller and the tube material are driven to rotate relative to each other to spin the tube material, and an end portion of the tube material has a predetermined angle with respect to the tube material. A reduced diameter portion centered on the inclined axis of the bent end portion is formed.
[0008]
In the method of forming an end portion of the tube material, as described in claim 2 , a plurality of rotation shafts for relative rotation driving of the roller and the tube material from the main shaft to the axis of the bent end portion are provided. It may be set so as to be asymptotic in a cycle, and the roller and the tube material may be driven to rotate relative to each other for each cycle to perform spinning processing on the tube material.
[0009]
Furthermore, in the method for forming an end of a tube material according to claim 1 or 2 , as described in claim 3 , the bent end is formed at the end of the tube material and the bent end is reduced in diameter. It is good to do. In particular, as described in claim 4, the end portion of the tube material may be pressed and inserted into a mold having a predetermined shape to form the bent end portion and the bent end portion may be reduced in diameter.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the tube material end forming method having the above-described configuration will be described with reference to the drawings. 1 to 3 show a spinning device, as one step in the end portion forming method of a tube material shown in FIGS. 4 to 9, used in the spinning process step of FIG. The final product of this embodiment is supplied to, for example, an outer cylinder (not shown) of a silencer for automobiles, a catalytic converter shown in FIG. In this embodiment, the tube material to be processed is a stainless steel tube, but is not limited thereto, and other metal tubes may be used.
[0017]
First, a method for forming an end portion of a tube material according to an embodiment of the present invention will be described in the order of steps with reference to FIGS. In the present embodiment, prior to the spinning process, bending is performed on the tube material 4 which is a workpiece, as shown in FIGS. FIG. 4 shows a part of a mold used for bending, and a cylindrical bore is formed when an upper mold (not shown) is combined with a lower mold 80. This cylindrical bore is formed in the shape of the processing target shown in FIG. 6, and the end of the tube material 4 is bent after bending as shown by a recess 81 formed on the lower mold 80 side of FIG. It is formed to have a predetermined outer shape with a reduced diameter.
[0018]
On the other hand, in the tube material 4 of the present embodiment, the end portions 4e on both sides of the tube material 4 before bending are as shown in FIG. 4 so that the opening end surface is substantially orthogonal to the axis of the bent end portion 4f after bending. They are formed on inclined surfaces parallel to each other. Further, the catalyst material CA is accommodated in advance in the tube material 4 of the present embodiment.
[0019]
Thus, in the cylindrical bore formed by the die having the lower die 80 (comprising the concave portion 81 and the upper die concave portion), as shown in FIG. 4, one of the tube materials 4 containing the catalyst CA is accommodated. The inclined end portion 4e is arranged so as to be substantially perpendicular to the inclination direction during bending. When the tube material 4 is pressed and inserted, the tube material 4 is bent and reduced in diameter along the shape of the cylindrical bore to form a bent end 4f shown in FIG. In this embodiment, the upper die and the lower die are divided. However, the die may be an integrated die having a bore formed in one block.
[0020]
When the tube material 4 is taken out of the mold, a bent end portion 4f with the axis Xf inclined with respect to the axis Xt of the tube material 4 is formed at the end of the tube material 4 as shown in FIG. The At this time, the opening end surface of the bent end portion 4f is formed on a surface substantially orthogonal to the axis thereof, so that it is not necessary to cut the tip of the bent end portion 4f after processing. The bent end portion 4f formed in this bending step has a smooth curved surface and can be referred to as a curved portion. However, even when the curved portion is formed, the axis Xf inclined at the center with respect to the axis Xt of the tube material 4 is used. It can be said that In the present embodiment, the end portion of the tube material 4 is bent and reduced in diameter after bending, so that the outer shape shown in FIG. 6 is obtained. However, only the bending may be performed without reducing the diameter. Further, the bending method is not limited to the method shown in FIGS. 4 to 6, and for example, hydroforming or high-frequency heating processing may be used.
[0021]
Thereafter, a spinning process is performed on the bent end portion 4f of the tube material 4 as shown in FIG. 7, and a bent reduced diameter portion including a tapered portion 4b and a neck portion 4c is formed on one end side of the tube material 4. This will be described later. Subsequently, the same processing is performed on the other end side of the tube material 4 as shown in FIG. 8, and the catalytic converter shown in FIG. 9 is formed. Although the catalytic converter of FIG. 9 is schematically shown, an example of a specific external shape after processing becomes the shape shown in FIG. Thus, for example, two catalytic converters 4x and 4y formed in accordance with the steps shown in FIGS. 4 to 9 can be arranged side by side to constitute the automobile exhaust system shown in FIG.
[0022]
Next, the configuration of the spinning processing apparatus used in the process of FIG. 7 will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the first driving means of the present invention is formed on the base BS. A first driving mechanism 1 as a second driving mechanism, a second driving mechanism 2 as a second driving means, and a third driving mechanism 3 as a third driving means are configured. As described above, the tube material 4 is formed with the bent end portion 4f, and the surface formed by the axis Xt of the tube material 4 and the axis Xf of the bent end portion 4f inclined with respect to this is the base BS. The tube material 4 is supported so as to be parallel.
[0023]
In the first drive mechanism 1, as shown in FIGS. 1 and 2, the axis Xf of the bent end 4f of the tube material 4 is the X axis (in FIG. 1, the axis Xt of the tube material 4 and the bent end portion 4f's axis Xf is on the same plane and coincides), and in parallel therewith, a pair of X-axis guide rails 5 are fixed to one side (the right side in FIG. 1) on the base BS. A housing 20 is movably disposed along the guide rail 5. A ball socket 7 is fixed to the lower portion of the housing 20, and a screw shaft 8 screwed into the ball socket 7 is disposed on the base BS in parallel with the X-axis guide rail 5 and can be rotated by a servo motor 9. It is supported. Thus, when the screw shaft 8 is rotationally driven by the servo motor 9, the housing 20 is configured to move along the X axis.
[0024]
On the other hand, a base 1a is formed on the other side (the left side in FIG. 1) of the base BS, and a pair of Y-axis guide rails 10 orthogonal to the X-axis guide rail 5 are fixed on the base 1a. A pair of sliders 11 are movably disposed on these Y-axis guide rails 10, and a clamp device 12 is supported on these sliders 11. The clamp device 12 includes a lower clamp 13 fixed to the slider 11 and an upper clamp 17 disposed above the clamp. The tube material 4 is sandwiched between the lower clamp 13 and the upper clamp 17. A ball socket 14 (FIG. 2) is fixed to the lower part of the lower clamp 13, and a screw shaft 15 that engages with the ball socket 14 is disposed on the base 1 a in parallel with the Y-axis guide rail 10, and is driven by a servo motor 16. It is rotatably supported. Thus, when the screw shaft 15 is rotationally driven by the servo motor 16, the clamping device 12 is configured to move along the Y axis.
[0025]
For example, a hydraulically driven cylinder 18 is disposed on the upper portion of the upper clamp 17 so that the upper clamp 17 is supported so as to be driven up and down. When the tube material 4 is attached and detached, the upper clamp 17 is driven upward. Is done. A semi-cylinder clamping surface is formed on the upper surface of the lower clamp 13, and a semi-cylindrical clamping surface is also formed on the lower surface of the upper clamp 17, and the tube material 4 is sandwiched between these clamping surfaces. Is configured to be held so as not to rotate or move. Further, a stopper 19 is disposed on the side of the clamp device 12 opposite to the housing 20, and the pipe material 4 is disposed so that one end of the stopper 19 abuts on the stopper 19. The stopper 19 is attached to the lower clamp 13 so that it can move together with the clamp device 12. If the stopper 19 is configured so that the position of the stopper 19 can be adjusted in the X-axis direction with respect to the lower clamp 13, the axial positioning of the tube material 4 can be performed appropriately and easily.
[0026]
Thus, after the pipe material 4 is disposed on the clamping surface of the lower clamp 13 so that one end thereof abuts against the stopper 19, the upper clamp 17 is driven downward by the hydraulic cylinder 18. 4 is held at a predetermined position between the upper clamp 17 and the lower clamp 13. At this time, as shown in FIG. 1, the axis Xt of the tube material 4 and the axis Xf of the bent end portion 4f are on the same plane parallel to the base BS (the same height from the base BS) with respect to an axis Xr of the main shaft 21 described later. A).
[0027]
Next, the second drive mechanism 2 will be described. On the right side of FIG. 1, the main shaft 21 is located on the same plane parallel to the base BS with respect to the axis Xt of the tube material 4 and the axis Xf of the bent end 4f. Then, it is arranged so as to face the tube material 4 substantially coaxially with the axis Xf of the bent end portion 4f, and is supported by the housing 20 so as to be rotatable about the axis Xr via bearings 20a and 20b. . The main shaft 21 is formed of a hollow cylindrical member, and a cylindrical cam shaft 23 is accommodated in the hollow portion, and is connected to a speed change mechanism 50 described later. Further, the connecting rod 41 of the mandrel 40 is supported so as to be able to advance and retract in the axial direction so as to penetrate the hollow portion of the cam shaft 23. The mandrel 40 is formed so as to match the inner shape of the bent end 4 f of the tube material 4. The base end portion of the connecting rod 41 is supported by a forward / backward drive cylinder 42, and the cylinder 42 is supported by the base BS via a bracket 1c.
[0028]
The main shaft 21 is connected to a pulley 22b via a gear train 22a. The pulley 22b is connected to a motor or the like (not shown) of a rotational drive means via a belt (not shown). It is rotationally driven by a motor or the like. On the other hand, a flange 24 is fixed to the tip of the main shaft 21, and when the main shaft 21 is driven to rotate, the flange 24 rotates about the axis Xr. And the front-end | tip part of the cam shaft 23 is supported so that rotation with respect to this flange 24 is possible. A cam plate 25 is fixed to the distal end portion of the cam shaft 23, and the cam plate 25 is rotationally driven around the axis Xr together with the cam shaft 23.
[0029]
As shown in FIG. 3, the cam plate 25 is formed with three spiral guide grooves 25 a, and guide pins that move in the radial direction as the cam plate 25 rotates in each of the guide grooves 25 a. 26 is arranged. These guide pins 26 are respectively held by three support members 27, and a roller 28 is rotatably supported by each support member 27 as shown in FIGS. Thus, when the main shaft 21 is driven to rotate, the roller 28 rotates about the axis Xr, and the support member 27 is driven in the radial direction according to the rotation of the cam plate 25, so that the roller 28 is moved to the tube material 4. It is driven so as to be close to and away from the axis Xr.
[0030]
The speed change mechanism 50 to which the cam shaft 23 is connected uses a flexure-meshing type driving device, and is formed on the inner surface of the pair of outer rings 51 and 52 respectively engaged with the main shaft 21 and the cam shaft 23. A flexible tooth wheel 53 that is engaged with the same number of tooth gaps and formed with tooth shapes of different number of teeth, and the teeth of the outer rings 51 and 52 that rotatably support the tooth wheel 53. A wave forming wheel 54 is provided so as to be meshed at two locations facing the groove. The wave forming wheel 54 is rotationally driven by a drive reduction motor 55. The outer rings 51 and 52 are respectively supported by support gears 56 and 57, a drive gear 58 that meshes with the support gear 56 is attached to the main shaft 21, and a driven gear 59 that meshes with the support gear 57 is attached to the cam shaft 23.
[0031]
Additional flexible meshing type driving device, for example a wave gear device omitted a description of the operating principle in what is known as (Harmonic Drive Systems, Inc. registered trademark of "Harmonic Drive") is, rotation of the spindle 21 Accordingly, a differential mechanism in which a relative speed difference is generated between the outer rings 51 and 52 is configured. Thus, when the main shaft 21 is rotationally driven, the cam plate 25 is rotationally driven by the differential between the outer rings 51 and 52 via the cam shaft 23, and each support member 27, and thus each roller 28, is the shaft of the main shaft 21. It is configured to move in the radial direction with respect to Xr.
[0032]
The number of rollers 28 may be one instead of a plurality, but it is desirable to use a plurality of rollers in order to reduce intermittent impacts. The roller 28 may have any movement path as long as it can be displaced in the radial direction. Other means such as a planetary gear mechanism may be used as the driving means for the roller 28.
[0033]
Next, the third drive mechanism 3 will be described. The left side table 6 in FIG. 1 has a rotary drive means comprising, for example, a motor 31, and the output shaft 31 a of the motor 31 is located above FIG. It extends in the direction perpendicular to the base BS, engages with the lower clamp 13, and is configured to be able to rotate the lower clamp 13 around the output shaft 31a. An arcuate guide groove 32 centered on the output shaft 31 a is formed on the upper surface of the table 6, and a guide roller 33 fitted in the guide groove 32 is rotatably supported on the lower surface of the lower clamp 13. Has been. Thus, the lower clamp 13 rotates along the guide groove 32 and is driven to rotate about the output shaft 31a.
[0034]
The driving means such as the motors 9, 16, 31 and the cylinder 18 and the like are electrically connected to a controller (not shown), and a control signal is output from the controller to each driving means and numerically controlled. It is configured as follows.
[0035]
The method for reducing the diameter of the bent end 4f of the tube material 4 performed by the spinning processing apparatus having the above-described configuration will be described. In FIG. 1, first, the upper clamp 17 is lifted and placed on the clamp surface of the lower clamp 13. The pipe material 4 to be processed is arranged, and the cylinder 18 is driven at a predetermined position in contact with the stopper 19. As a result, the upper clamp 17 is lowered, and the tube material 4 is sandwiched between the lower clamp 13 and the upper clamp 17 and is held in a non-rotatable state.
[0036]
The table 6 is driven along the Y-axis guide rail 10 and is rotated about the output shaft 31a of the motor 31. As shown in FIG. 2, the axis Xf of the bent end portion 4f of the tube material 4 is the main shaft. It is positioned so as to be coaxial with the axis Xr of 21. At this time, each roller 28 is retracted outside the outer diameter of the bent end portion 4 f of the tube material 4. Next, the casing 20 is driven forward along the X-axis guide rail 5 (moves leftward in FIGS. 1 and 2), and each roller 28 is positioned at a point where the processing material is retracted from the tip of the tube material 4. Stopped at. In other words, each roller 28 is located at the processing start point, and this position is set as the original position. Then, the mandrel 40 is driven forward so that the mandrel 40 is positioned within the opening of the distal end portion of the bent end portion 4 f of the tube material 4.
[0037]
From this state, the main shaft 21 is rotationally driven, each roller 28 rotates about the axis Xr, and the cam plate 25 is rotationally driven via the speed change mechanism 50, so that each roller 28 moves in the direction of the axis Xr of the main shaft 21. Moving. At the same time, the housing 20 and thus the rollers 28 are driven backward along the X-axis guide rail 5 (moved to the right in FIGS. 1 and 2). As a result, each roller 28 rotates in a state where it is pressed against the outer peripheral surface of the bent end portion 4f of the tube material 4 and rotates around the main shaft 21 around the axis Xr, while in the radial direction in the axis Xr direction. Driven and spinning is performed.
[0038]
When each roller 28 is further driven backward beyond a predetermined movement amount, each roller 28 is held in that state (position moved by a predetermined amount). Accordingly, the distal end portion of the tube material 4 is plastically deformed by the backward drive of each roller 28, and an axis inclined at a predetermined angle with respect to the axis Xt of the tube material 4 continuously to the minimum diameter portion of the taper portion 4b as shown in FIG. A cylindrical neck portion 4c centering on Xf is formed. Thereafter, the tube material 4 and the roller 28 are driven back to their original positions, and one reciprocating movement is made one cycle together with the above-described forward movement path of the diameter reducing operation, and the spinning process of the first cycle is completed. In the present embodiment, for the sake of convenience of explanation, only the diameter reducing operation in the forward movement path has been described. However, the same machining is performed in the backward movement path, and the spinning process is set so that the two passes in one cycle are also performed. If so, the processing efficiency becomes good. Further, the roller 28 is set so as to continuously rotate without stopping every cycle in view of energy efficiency and tact time.
[0039]
Thus, according to the diameter reduction processing of this embodiment, since the processing is performed a plurality of times while the roller 28 is always in contact with the processing surface of the bent end portion 4f of the tube material 4, a smooth processing surface is obtained. In addition, the thickness reduction and uneven thickness of the processed part are minimized, and a desired strength is ensured. In addition, since bending is performed in advance, there is no difficulty in processing, so the overall processing limit is improved. In addition, since the load on the roller 28 and the like does not become excessive, the machining operation can be performed smoothly. For this reason, it is possible to easily form a bent and reduced diameter portion even for a large-diameter tube material.
[0040]
The diameter of the mandrel 40 is set to a value equal to the inner diameter of the neck 4c after the tube material 4 is processed, and the spinning process is performed with the neck 4c sandwiched between the mandrel 40 and the roller 28 at the time of finishing. Therefore, the neck 4c can be easily formed on a smooth surface. In particular, spinning is performed along the axis Xf of the bent end portion 4f of the tube material 4, and the opening end of the bent reduced diameter portion is maintained substantially perpendicular to the axis, so that the tip of the neck portion 4c is separately provided. There is no need to perform processing such as cutting.
[0041]
Further, when it is necessary to form a large inclination angle of the axis Xf of the bent diameter portion with respect to the axis Xt of the tube material 4, the table 6 is attached to the output shaft 31a of the motor 31 during the spinning process or further every cycle. The axis Xf of the bent end 4f inclined by a predetermined angle with respect to the axis Xt of the tube material 4 is arranged substantially coaxially with the axis Xr of the main shaft 21. It is recommended to perform spinning. Thereby, even when the inclination angle of the axis | shaft of the bending reduced diameter part with respect to the axis | shaft of the pipe | tube raw material 4 is large, a spinning process can be performed easily.
[0042]
In the embodiment of FIGS. 1 and 2, the casing 20 is driven along the X axis and the tube material 4 is driven along the Y axis so that the two move relatively. However, the casing 20 may be fixed on the base BS and the tube material 4 may be driven along the X axis and the Y axis. That is, the first drive mechanism 1 as the first drive means of the present invention may be concentrated on the left side of FIG.
[0043]
Further, in the embodiment described in FIGS. 1 and 2, the height from the base BS is such that the axis Xt of the tube material 4 is located on the same plane parallel to the base BS with respect to the axis Xr of the main shaft 21. However, the height of the axis Xt of the tube material 4 from the base BS may be variable, and the height of the axis of the tube material 4 may be adjusted in the vertical direction with respect to the axis Xr of the main shaft 21. That is, in this embodiment, if a fourth drive mechanism (not shown) for driving the tube material 4 in the vertical direction is added, the adjustment becomes easier.
[0044]
【The invention's effect】
Since this invention is comprised as mentioned above, there exists an effect as described below. Ie upon the end portion forming method of a tube material according to claim 1, the bent end portion is formed in advance by bending the end portion of the tube material, smoothly and efficiently spinning process to the bent end portion Therefore, a bent diameter-reduced portion inclined at a predetermined angle with respect to the tube material can be easily and integrally formed at the end of the tube material, and a smooth processed surface can be ensured for the diameter-reduced portion. it can. Therefore, the bent and reduced diameter portion can be easily formed even for a large-diameter tube material, and can be formed in a desired shape with high accuracy. In particular, since the spinning process is performed along the axis of the bent end, the opening end is maintained substantially perpendicular to the axis of the bent end, so that it is not necessary to perform a separate cutting process or the like, and the processing time is reduced. Shortened. Of course, since conventional joining operations such as welding are not required, the manufacturing is easy and the manufacturing cost can be reduced.
[0046]
Further, Oite the molding method according to claim 2, even when the inclination angle of the axis of flexion reduced diameter portion relative to the axis of the tube material is large, it is possible to perform more smooth spinning, the bending reduced diameter portion On the other hand, a smooth machined surface can be secured.
[0047]
Moreover, according to the shaping | molding method of Claim 3 and 4 , a bending edge part can be formed easily and cheaply with respect to the edge part of a pipe | tube raw material.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which a spinning processing apparatus according to an embodiment of the present invention is partially broken.
FIG. 2 is a plan view showing a state in which a part of the spinning processing apparatus according to the embodiment of the present invention is broken.
FIG. 3 is a front view showing a cam plate and a support member in an embodiment of the present invention.
FIG. 4 is a plan view showing a bending process in the method for forming an end of a tube material according to an embodiment of the present invention.
FIG. 5 is a plan view showing a bending step in the method for forming an end of a tube material according to an embodiment of the present invention.
FIG. 6 is a plan view showing a state of the tube material after bending in the method for forming an end portion of the tube material according to the embodiment of the present invention.
FIG. 7 is a plan view showing a spinning process in the method for forming an end of a tube material according to an embodiment of the present invention.
FIG. 8 is a plan view showing a bending step for the other end in the method for forming an end of a tube material according to an embodiment of the present invention.
FIG. 9 is a plan view showing a state of the tube material after processing in the method for forming an end portion of the tube material according to one embodiment of the present invention.
FIG. 10 is a plan view showing an example of an exhaust system for an automobile in which two catalytic converters formed by the method for forming an end of a tube material according to an embodiment of the present invention are arranged side by side.
[Explanation of symbols]
1 first drive mechanism, 2 second drive mechanism, 3 third drive mechanism,
4 tube material, 4b taper, 4c neck, 4f bent end,
9, 16, 31, 55 motor, 18, 25 cylinders,
12 clamping devices, 21 spindles, 28 rollers,
32 guide grooves, 33 guide rollers, 50 speed change mechanism

Claims (4)

管素材の端部を曲げ加工により屈曲して屈曲端部を形成し、該屈曲端部の軸と略同軸に主軸を配置し、該主軸に対し径方向に移動可能にローラを支持し、該ローラが前記屈曲端部に当接するように前記管素材を支持し、前記ローラを前記主軸に向かって径方向に駆動すると共に、前記ローラと前記管素材を相対的に回転駆動して前記管素材に対しスピニング加工を行ない、前記管素材の端部に、前記管素材に対し所定角度傾斜した前記屈曲端部の軸を中心とする縮径部を形成することを特徴とする管素材の端部成形方法。The end of the tube material is bent by bending to form a bent end, the main shaft is disposed substantially coaxially with the axis of the bent end, and a roller is supported so as to be movable in a radial direction with respect to the main shaft. The tube material is supported so that a roller comes into contact with the bent end portion, and the roller is driven in a radial direction toward the main shaft, and the roller and the tube material are driven to rotate relative to each other. The tube material end is formed with a reduced diameter centered on the axis of the bent end inclined at a predetermined angle with respect to the tube material. Molding method. 前記主軸から前記屈曲端部の軸に至るまで、前記ローラと前記管素材の相対的な回転駆動の回転軸が複数のサイクルで漸近するように設定し、各サイクル毎に前記ローラと前記管素材を相対的に回転駆動して前記管素材に対しスピニング加工を行なうことを特徴とする請求項記載の管素材の端部成形方法。From the main shaft to the axis of the bent end, the rotational axis of the relative rotational drive of the roller and the tube material is set to gradually approach in a plurality of cycles, and the roller and the tube material are set for each cycle. relatively rotating drive to the end portion forming method of a tube material according to claim 1, characterized by performing spinning process to the tube material a. 前記管素材の端部に前記屈曲端部を形成すると共に前記屈曲端部を縮径することを特徴とする請求項1又は2記載の管素材の端部成形方法。The method of forming an end portion of a tube material according to claim 1 or 2, wherein the bent end portion is formed at an end portion of the tube material and the diameter of the bent end portion is reduced. 前記管素材の端部を所定形状の型内に押圧挿入して前記屈曲端部を形成すると共に前記屈曲端部を縮径することを特徴とする請求項記載の管素材の端部成形方法。4. The method for forming an end portion of a tube material according to claim 3, wherein the end portion of the tube material is pressed and inserted into a mold having a predetermined shape to form the bent end portion and the diameter of the bent end portion is reduced. .
JP37659798A 1998-12-24 1998-12-24 End forming method for tube material Expired - Fee Related JP4116723B2 (en)

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JP37659798A JP4116723B2 (en) 1998-12-24 1998-12-24 End forming method for tube material

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JP37659798A JP4116723B2 (en) 1998-12-24 1998-12-24 End forming method for tube material

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JP2000190038A5 JP2000190038A5 (en) 2006-02-02
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Cited By (1)

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NL1016348C2 (en) * 2000-07-21 2002-01-22 Johan Massue Method and forming machine for deforming a hollow workpiece.
JP5143338B2 (en) * 2004-12-27 2013-02-13 株式会社三五 Method and apparatus for forming different diameter parts of workpiece
JP4986179B2 (en) * 2008-05-13 2012-07-25 独立行政法人産業技術総合研究所 Spinning method and apparatus
KR101286985B1 (en) * 2011-12-27 2013-07-23 김위식 knuckle molding apparatus of eccentric cone
KR101286987B1 (en) 2011-12-27 2013-07-23 김위식 knuckle molding method of eccentric cone
CN107755530A (en) * 2017-09-30 2018-03-06 深圳市永顺通用机械有限公司 A kind of fully-automatic bent-pipe draw perforating press

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CN105458104B (en) * 2016-01-31 2018-05-25 潍坊神舟重工机械有限公司 Closing machine for steel cylinder

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