JP4444546B2

JP4444546B2 - Friction stir welding equipment

Info

Publication number: JP4444546B2
Application number: JP2002034343A
Authority: JP
Inventors: 幸治土肥
Original assignee: Kawasaki Jukogyo KK
Current assignee: Kawasaki Motors Ltd
Priority date: 2002-02-12
Filing date: 2002-02-12
Publication date: 2010-03-31
Anticipated expiration: 2020-07-19
Also published as: JP2002273578A

Description

【０００１】
【発明の属する技術分野】
本発明は、回転による摩擦熱で被接合物を軟化、攪拌して接合する摩擦攪拌接合装置に関する。
【０００２】
【従来の技術】
図７は、或る提案された摩擦攪拌接合装置１を示す正面図である。この摩擦攪拌接合装置１では、先端にピン２を有する回転子３を高速で回転させながらワークに押し付け、ピン２とワークとの接合部を、回転による摩擦熱で軟化させるとともに、回転によって攪拌して接合する。つまり、摩擦攪拌接合装置１は、回転子３を、その軸線まわりに高速で回転させる回転用駆動源４と、回転子３を、回転軸線にそって直進移動させる直進駆動源５とを有する。摩擦攪拌接合装置１は、支持フレーム６とリニアスライダ７とボールねじ８とを有し、支持フレーム６が、加工機械本体に保持される。
【０００３】
リニアスライダ７は、支持フレーム６に固定される。直進案内されるリニアスライダ７のガイド部には、回転自在に支持される回転子３と、回転子３を回転駆動する回転駆動源４とが取り付けられる。ボールねじ８は、リニアスライダ７に平行に支持フレーム６に固定され、ボールねじ８のねじ軸１０に螺着されるナット部材９がリニアガイド７のスライド部材に連結される。したがって、ボールねじ８のねじ軸１０を、サーボモータなどの直進駆動源５で回転駆動することによって、ナット部材９はねじ軸１０にそって上下に直進移動する。このナット部材９に取り付けられるスライド部材は、回転子３および回転駆動源４とともに直進移動する。
【０００４】
このような構成によって回転子３を回転させながら直進移動させることができる。
【０００５】
【発明が解決しようとする課題】
上記した摩擦攪拌接合装置１では、回転子３を回転駆動するための回転駆動源４ごと直進駆動源５でスライドさせて、ワークに押圧していたので、大容量の直進駆動源を必要とし、装置全体が大掛かりになるといった問題を有する。またこれにより、コストアップも招いていた。さらに、このような大重量の摩擦攪拌接合装置１を装備する加工機械本体の負荷重量も大きくなってしまう。
【０００６】
また、ボールねじ８とリニアスライダ７とを用いる構造では、直進駆動力を発生するボールねじ８のねじ軸１０と、押圧したときにワークから負荷を受ける回転子３の軸線とは、図７で参照符Ｗで示すように距離Ｗだけ離間している。このように直進駆動軸と負荷軸とが離間していると、押圧時に曲げモーメントが発生し、これによってガタが生じやすく、耐久性に問題がある。
【０００７】
また、直進駆動源５であるサーボモータの電流値に基づいて回転子の押圧力を検出する場合があるが、上記したようにガタが生じると、電流値が変動し、押圧力を正確に検出できなくなるといった問題が生じる。
【０００８】
また、直進駆動源５は、回転子３とともに回転駆動源４を直進移動させるので、回転駆動源４の重量分、直進駆動源５による回転子３の押圧力と、直進駆動源４の電流値との関係に誤差を与えるといった問題がある。
【０００９】
本発明の目的は、回転駆動源を直進駆動源で移動させず、また、押圧時に曲げモーメントが発生しないように構成される摩擦攪拌接合装置を提供することである。
【００１１】
【課題を解決するための手段】
本発明は、高速回転する回転子を回転軸線方向に移動させ、先端部を被接合物に押圧し、前記先端部の回転による摩擦熱によって前記被接合物の接触部を軟化させ、攪拌して被接合物を接合する摩擦攪拌接合装置において、
回転子を回転軸線まわりに高速回転させるサーボモータから成る回転駆動源と、
回転子を回転軸線方向に直進移動させるサーボモータから成る直進駆動源と、
回転駆動源および直進駆動源をそれぞれ支持し、回転子を回転軸線方向に移動可能に支持する支持部材と、
回転子の回転軸線方向への移動を許容し、かつ回転駆動源からの回転駆動力を回転子に伝達する回転伝達手段と、
回転子の回転を許容し、かつ直進駆動源からの直進駆動力を回転子に同軸に伝達する直進伝達手段とを備えることを特徴とする摩擦攪拌接合装置である。
【００１２】
また本発明は、高速回転する回転子を回転軸線方向に移動させ、先端部を被接合物に押圧し、前記先端部の回転による摩擦熱によって前記被接合物の接触部を軟化させ、攪拌して被接合物を接合し、
加工機械本体に装備される摩擦攪拌接合装置において、
回転子を回転軸線まわりに高速回転させるサーボモータから成る回転駆動源と、
回転子を回転軸線方向に直進移動させるサーボモータから成る直進駆動源と、
回転駆動源および直進駆動源をそれぞれ支持し、回転子を回転軸線方向に移動可能に支持する支持部材と、
回転子の回転軸線方向への移動を許容し、かつ回転駆動源からの回転駆動力を回転子に伝達する回転伝達手段と、
回転子の回転を許容し、かつ直進駆動源からの直進駆動力を回転子に同軸に伝達する直進伝達手段とを備え、
支持部材は、加工機械本体に固定され、
加工機械本体は、前記回転軸線と直角方向に、任意の長さ分、回転子と被接合物との相対動作を生じさせることを特徴とする摩擦攪拌接合装置である。
【００１３】
また本発明は、前記回転子の回転駆動力は、回転子の側面に伝達されることを特徴とする。
【００１４】
また本発明は、前記回転子の回転駆動力は、回転子の一端部に伝達されることを特徴とする。
【００１５】
本発明に従えば、回転子を回転させる回転駆動源は、回転子の回転軸線方向への変位を許容した状態で回転力を伝達する回転伝達手段によって回転力を伝達するので、回転駆動源を支持部材に固定した状態で、回転子を回転させながら、直進駆動源で回転子を直進移動させることができる。これによって、直進駆動源は、回転子のみを直進移動させればよく、回転駆動源を移動させる必要がないので、直進駆動源の容量が少なくてすみ、小型化できる。これによって、この摩擦攪拌接合装置を保持する加工機械本体の負担も軽くなる。また、回転駆動源を移動させる必要がないことにより、直進駆動源の電流値と押圧力との関係に、誤差が生じにくくなる。
【００１６】
また、回転駆動源の回転力は、回転子の側面から伝達されてもよく、端部から伝達されてもよい。
【００２２】
また本発明は、（ａ）回転子保持部材７０であって、
回転子の回転子本体３６が挿入される回転子挿入孔７２を有し、回転子を保持する下端部を有し、
前記下端部の外周部に、前記軸線Ｌに平行に延びる複数のスプライン７６が形成される回転子保持部材７０と、
（ｂ）回転支持部材７３であって、
内周側に前記スプライン７６が嵌まる第１スプライン受け７５と、
第１スプライン受け７５を、支持部材に、前記軸線Ｌまわりに回転可能に支持し、支持部材に取り付けられる第１軸受け７４とを有する回転支持部材７３とを含み、
前記回転駆動源は、支持部材に固定的に支持される回転駆動用モータ４１を含み、
前記回転伝達手段は、回転子の回転軸線方向への移動を許容し、回転駆動用モータ４１からの回転駆動力を回転子保持部材７０に伝達し、
前記直進駆動原は、支持部材に固定的に支持される直進駆動用モータ４０を含み、
前記直進伝達手段は、回転子の回転を許容し、直進駆動用モータ４０からの直進駆動力を回転子保持部材７０の上端部に同軸に伝達することを特徴とする。
【００２３】
また本発明は、支持部材は、加工機械本体に固定され、
加工機械本体は、前記回転軸線と直角方向に、任意の長さ分、回転子と被接合物との相対動作を生じさせることを特徴とする。
【００２４】
【発明の実施の形態】
図１は本発明の実施の一形態である摩擦攪拌接合装置２０を示す図である。摩擦攪拌接合装置２０は、加工機械本体２３に装備される。
【００２５】
摩擦攪拌接合装置２０は、支持部材である支持フレーム３０、回転子３１、回転押圧機構３２を有する。支持フレーム３０が加工機械本体２３に固定され、回転押圧機構３２を保持する。回転押圧機構３２は、回転子３１を、その軸線Ｌまわりに高速で回転させるとともに、回転軸線Ｌ方向に直進移動させる。また、回転子３１の先端に対向する受け部３３が、別途設けられる。回転子３１は、先端側が先細りとなり（図２参照）、先端部は回転軸線Ｌと同軸の円柱部３５が形成され、その下端面から回転軸線Ｌに沿ってピン３４が突出して設けられる。
【００２６】
たとえばアルミニウム合金板などの２枚のワークを接合する場合、２枚のワークを重ね、接合部の下部に摩擦攪拌接合装置２０の受け部３３が配置される。次に、回転押圧機構３２で回転子３１を高速で回転させるとともに、回転子３１を前進移動させる。すると、受け部３３と回転子３１との間に２枚のワークが挟持され、回転子３１先端のピン３４がワークの接合部に押圧される。回転しながら押圧されることによって摩擦熱が発生し、接合部近傍が軟化し、ピン３４が挿入される。
【００２７】
ピン３４が回転しながら挿入されることにより、接合部近傍で塑性流動を起こし、ピン３４によって攪拌される。また、ピン３４が挿入され、回転子３１の円柱部３５の下端面（ショルダー部）がワーク表面に押圧されると、この下端面によっても、ワーク表面が攪拌される。このようにして、ピン３４が２枚のワークの接合部を超えるまで挿入され、所定の押圧力で所定時間押圧して攪拌する。加工機械本体２３は、接合時もしくは接合中においては、接合の適用内容に応じて、回転軸線Ｌと直角方向に、任意の長さ分、回転子３１とワークとの相対動作を生じさせる。その後、回転押圧機構３２で回転子３１を、回転軸線Ｌに沿って後退させる。ピン３４が引き抜かれると、攪拌され塑性流動を起こした接合部近傍が冷却して硬化し、接合部で２枚のワークが接合される。
【００２８】
図２は、摩擦攪拌接合装置２０の回転押圧機構３２の構成を示す図である。回転子３１は、回転子本体３６と回転子３１を保持する回転子保持部材７０とからなり、回転押圧機構３２は、回転子３１を回転駆動する回転駆動源であるインダクションモータ４１、回転子３１を直進移動させる直進駆動源であるサーボモータ４０と、インダクションモータ４１からの回転力を回転子保持部材７０に伝達する回転伝達手段４２と、サーボモータ４０の直進駆動力を回転子保持部材７０に伝達する直進伝達手段４３とを有する。
【００２９】
支持フレーム３０は、サーボモータ４０、インダクションモータ４１を固定的に支持し、回転子保持部材７０を回転支持部材７３を介して支持する。回転子保持部材７０は、外周に回転軸線Ｌに平行に延びる複数のスプライン７６を有し、前記回転支持部材７３は、内周側にスプライン７６が嵌まるスプライン受け７５を有し、外周側に軸受け７４を有し、この軸受け７４が支持フレーム３０に取り付けられる。このような構成によって、回転子保持部材７０は、回転軸線Ｌまわりに回転可能で、かつ回転軸線Ｌ方向に移動自在に支持フレーム３０に支持される。
【００３０】
回転子保持部材７０は、円柱状であり、下端部に回転子挿入孔７２が形成され、この回転子挿入孔７２に回転子本体３６が挿入され、回転軸線Ｌまわりの回転、および回転軸線Ｌ方向への移動が阻止されて回転子保持部材７０に保持される。
【００３１】
回転伝達手段４２は、インダクションモータ４１の出力軸６７に固定される第一ベルト車６１、Ｖベルト６２、第二ベルト車６３、スプライン軸６６、スプライン軸６６と第二ベルト車６３とを連結するユニバーサルジョイント６４とから構成される。回転子保持部材７０の上端部には、内スプラインを有するスプライン孔７１が、回転軸線Ｌと同軸に形成され、このスプライン孔７１に前記スプライン軸６４が挿入される。これによって、スプライン軸６４と回転子保持部材７０とは、軸線Ｌ方向に直進移動可能で、かつ軸線Ｌまわりの回転が阻止された状態で連結される。
【００３２】
第二ベルト車６３は、軸受け６５によって軸線Ｌまわりに回転自在に支持フレーム３０に支持され、この第二ベルト車６３から第一ベルト車６1にわたってＶベルト６２が巻き掛けられ、第二ベルト車６３とスプライン軸８１とが、ユニバーサルジョイント６４を介して連結される。このような構成の回転伝達手段４２によって、インダクションモータ４１の回転力が回転子３１に伝達される。
【００３３】
直進伝達手段４３は、サーボモータ４０の出力軸４４に固定される有歯ベルト車４５と、タイミングベルト４６と、ナット部材４７とを有し、この直進伝達手段４３に直線部材４８が連結される。直進部材４８は、前記ナット部材４７が螺合するねじ軸４９と、ねじ軸４９の下端部に固定され、回転子保持部材７０の上端部に連結される連結部材５０とを有する。連結部材５０の下端部は、一対の軸受け８０を介して、回転子保持部材７０が軸線Ｌまわりに回転可能で、かつ連結部材５０と回転子保持部材７０とが回転軸線Ｌ方向へ移動が阻止された状態で連結される。また、連結部材５０下端部の外周部には、回転軸線Ｌに平行な方向に延びる複数の外スプライン８２が設けられ、支持フレーム３０には、前記外スプライン８２が嵌り込むスプライン受け８３が固定される。これによって、連結部材５０は、回転軸線Ｌまわりの回転が阻止され、かつ回転軸線Ｌ方向へ移動可能に設けられる。
【００３４】
連結部材５０の上端部にはねじ軸４９が固定され、このねじ軸４９は、回転軸線Ｌに同軸に配置される。ねじ軸４９に螺合するナット部材４７は、ボールネジであり、軸受け５２を介して回転軸線Ｌまわりに回転自在に支持され、軸受け５２は、支持フレーム３０に固定される。このナット部材４７の上端部に有歯ベルト車５１が一体に固定され、この有歯ベルト車５１からサーボモータ４０に取り付けられる有歯ベルト車４５にわたってタイミングベルト４６が巻き掛けられる。
【００３５】
次に、直進伝達手段４３の動作について説明する。サーボモータ４０を回転させると、有歯ベルト車４５、タイミングベルト４６を介してナット部材４７が回転する。ナット部材４７は、支持フレーム３０に対して回転軸線Ｌ方向に固定的に保持されているので、ナット部材４７の回転によってねじ軸４９が前進（下降）する。ねじ軸４９の下端部に固定される連結部材５０は、回転子保持部材７０に対して、回転可能かつ回転軸線Ｌ方向の移動が阻止されて連結されるので、回転子保持部材７０が回転可能な状態で前進する。サーボモータ４０を逆転させると、ナット部材４７の回転方向も逆転し、回転子３１は後退（上昇）する。
【００３６】
回転伝達手段４２は、スプライン軸６４によって、回転軸線Ｌ方向に移動可能で、かつ回転軸線Ｌまわりの回転力を回転子保持部材７０に伝達可能に構成されるので、回転子保持部材７０を前進、後退させながら回転させることができる。
【００３７】
このようにして、インダクションモータ４１で回転子３１を高速で回転させながら、サーボモータ４０によって回転軸線Ｌ方向に前進させ、回転子３１先端をワークに押圧し、サーボモータ４０を逆転させることによって、回転子３１を回転させながら後退させることができる。このとき、回転子に直進力を作用させる直進伝達手段４３の直進部材４８は、ねじ軸４９が回転子３１の回転軸線Ｌと同軸にあるので、前述した従来技術のように、押圧時に曲げモーメントが発生することが防がれる。また、直進駆動源であるサーボモータ４０は、従来技術のように回転子とともに回転駆動源であるインダクションモータ４１を直進移動させる必要がないので、サーボモータ４０のモータ容量が小さくて済み、サーボモータ４０を小型、軽量化できる。
【００３８】
また、摩擦攪拌接合装置２０では、サーボモータ４０の電流値によって、押圧力を検出するが、押圧時に曲げモーメントが発生しないことにより、サーボモータの電流値と押圧力との関係に、誤差が生じにくくなる。
【００３９】
図２に示す直進伝達手段４３では、ナット部材４７を回転軸線Ｌまわりに回転自在に、かつ回転軸線Ｌ方向への移動を阻止して支持フレーム３０に設け、このナット部材４７を回転させることによって、直進部材のねじ軸４９を前進、後退させるように構成したが、これとは逆に構成してもよい。つまり、図３に示すように、ねじ軸９２を軸受け９４によって回転自在に支持し、直進部材として下端部が回転子保持部材７０に連結され、上端部にねじ軸９２に螺合するナット部材９１を有する連結部材９０を設け、ねじ軸９２に有歯ベルト車９３を固定し、タイミングベルト４６を介してねじ軸９２を回転させることによって、ナット部材９１に一体に設けられる連結部材９０を前進、後退させるように構成してもよい。
【００４０】
図４は、本発明の他の実施形態の摩擦攪拌接合装置の回転押圧機構１００の構造を示す図である。図２、図３に示す回転押圧機構３２では、回転駆動力および直進力が、回転子３１の一端部から伝達される構成であるが、本実施形態の回転押圧機構１００では、回転駆動力が回転子３１の一端部から入力され、回転力が回転子３１の側面に伝達される。
【００４１】
つぎに、本実施形態の回転押圧機構１００の構成について詳細に説明する。なお、前述した回転押圧機構３２に対応する構成には同一の参照符号を付し、説明を省略する。
【００４２】
本実施形態の直進伝達手段１１０に連結される直進部材１０１は、円筒状であり、回転軸線Ｌに同軸に回転子保持部材７０の上端部を外囲して配置される。この円筒状の直進部材１０１の上下両端部に設けられる軸受け１０２，１０３を介して直進部材１０１と回転子保持部材７０とは、回転軸線Ｌまわりに相対的に回転自在であり、回転軸線Ｌ方向への移動が阻止されて連結される。この直進部材１０１の外周には外ねじが形成され、この外ねじにナット部材１０４が螺合する。
【００４３】
ナット部材１０４は、一対の軸受け１０５，１０６を介して支持フレーム３０に、回転軸線Ｌまわりに回転自在に、かつ回転軸線Ｌ方向への移動が阻止されて支持される。また、ナット部材１０４の外周には歯が形成されて有歯ベルト車として機能する。したがって、サーボモータ４０の有歯ベルト車４５からナット部材１０４にわたってタイミングベルト４６が巻き掛けられることによって、サーボモータ４０の回転駆動力が、直進部材１０１に伝達される。
【００４４】
また、直進部材１０１の外周部には回転軸線Ｌに平行にガイド溝１０７が形成されており、前記ナット部材１０４の上方で、直進部材１０１を外囲する環状の回り止め部材１０８が支持フレーム３０に固定されており、回り止め部材１０８には内側に突出し、直進部材１０１の前記ガイド溝１０７に嵌まり込む回り止め突起１０９が形成される。これによって、直進部材１０１は、回転軸線Ｌ方向には移動可能で、回転軸線Ｌまわりの回転が阻止される。
【００４５】
また、インダクションモータ４１は、出力軸６７にユニバーサルジョイント６４を介してスプライン軸６４が連結され、このスプライン軸６４と回転子保持部材７０とが、回転軸線Ｌまわりの回転が阻止され、かつ回転軸線Ｌ方向に移動可能に連結される。
【００４６】
サーボモータ４０を回転駆動させると、有歯ベルト車４５、タイミングベルト４６を介してナット部材１０４が回転軸線Ｌまわりに回転し、このナット部材１０４の回転によって、直進部材１０１を介して回転子保持部材７０および回転子３１が回転軸線Ｌ方向に直進移動する。このようにして、直進駆動源であるサーボモータ４０からの直進力が、直進部材１０７の側面から伝達される。
【００４７】
またインダクションモータ４１からの回転力は、スプライン軸６４によって、回転軸線Ｌ方向に移動可能に伝達され、これによって、回転子３１は、回転軸線Ｌまわりに回転しながら回転軸線Ｌ方向に直進移動することができる。このようにして、回転力は、回転子３１の一端部から伝達される。
【００４８】
本実施形態においても、回転駆動源であるインダクションモータ４１を移動させることが防がれる。また回転子３１に直進力を作用させる直進部材４８が、回転軸線Ｌと同軸に配置されるので、押圧時に曲げモーメントが作用するといったことが防がれる。
【００４９】
図５は、本発明のさらに他の実施形態の摩擦攪拌接合装置の回転押圧機構１２０の構成を示す図である。この回転押圧機構１２０では、インダクションモータ４１からの回転力が回転子３１の側面から伝達され、サーボモータ４０からの直進力が、回転子３１の上端部から伝達される。なお、図１〜図４に示される構成と同様の構成には同一の参照符号を付し、説明を省略する。
【００５０】
この回転押圧機構１２０では、図２で説明した回転押圧機構３２と同様の直進伝達手段４３を有する。ただし、本実施形態の回転伝達手段１２１は、回転子保持部材７０の側面から回転力が伝達されるので、直進伝達手段４３の連結部材５０は、回転伝達手段のタイミングベルト６２を避ける必要がないので、連結部材５０の構成を小さくすることができる。
【００５１】
回転子保持部材７０の外周には複数のスプライン１２２が、回転軸線Ｌに平行に形成される。回転力伝達手段１２１は、インダクションモータ４１の出力軸に固定されるＶベルト車６１、Ｖベルト６２、スプライン受け１２３を有する。スプライン受け１２３は、環状であり、回転子保持部材７０の前記スプライン１２２に嵌まり込み、スプライン受け１２３と回転子保持部材７０とは、回転軸線Ｌまわりの回転が阻止され、かつ回転軸線Ｌ方向へ移動可能に連結される。このスプライン受け１２３は、上下一対の軸受け１２４，１２５によって、回転軸線Ｌまわりに回転自在に、かつ回転軸線Ｌ方向への移動が阻止されて支持フレーム３０に支持される。また、スプライン受け１２３の外周部は、ベルト車として機能し、この外周部にはＶベルト６２が巻き掛けられる。
【００５２】
このような構成によって、インダクションモータ４１の回転力が、Ｖベルト車６１、Ｖベルト６２を介してスプライン受け１２３、回転子保持部材７０および回転子３１を回転軸線Ｌまわりに回転駆動する。また、回転子保持部材７０は、直進移動可能に支持されているので、直進伝達手段４３からの直進力によって回転しながら直進移動することができる。
【００５３】
本実施形態においても、回転駆動源であるインダクションモータ４１を移動させることが防がれる。また回転子３１に直進力を作用させる直進部材４８が、回転軸線Ｌと同軸に配置されるので、押圧時に曲げモーメントが作用するといったことが防がれる。
【００５４】
また、本実施形態の直進伝達手段４３を、図３で説明した構成と同様に、直進部材にナット部材を固定し、ねじ軸側を回転させるように構成してもよい。
【００５５】
図６は、本発明のさらに他の実施形態の摩擦攪拌接合装置の回転押圧機構１３０の構成を示す図である。この回転押圧機構１３０では、直進力および回転力が回転子３１の側面から伝達される。つまり、図４で説明した直進伝達手段１１０と、図５で説明した回転伝達手段１２１を有する。なお、図１〜図５に示される構成と同様の構成には同一の参照符号を付し、説明を省略する。
【００５６】
本実施形態においても、回転駆動源であるインダクションモータ４１を移動させることが防がれる。また回転子３１に直進力を作用させる直進部材１０１が、回転軸線Ｌと同軸に配置されるので、押圧時に曲げモーメントが作用するといったことが防がれる。
【００５７】
また、上述した各実施形態では回転駆動源としてインダクションモータを用いるように構成したが、本発明はこれに限らず、回転駆動源をサーボモータとしてもよい。このとき、回転伝達手段は、Ｖベルトでなく、タイミングベルトを用いる。
【００５８】
【発明の効果】
以上のように本発明によれば、回転子を回転させる回転駆動源は、回転子の回転軸線方向への変位を許容した状態で回転力を伝達する回転伝達手段によって回転力を伝達するので、回転駆動源を支持部材に固定した状態で、回転子を回転させながら、直進駆動源で回転子を直進移動させることができる。これによって、直進駆動源は、回転子のみを直進移動させればよく、回転駆動源を移動させる必要がないので、直進駆動源の容量が少なくてすみ、小型化できる。これによって、この摩擦攪拌接合装置を保持する加工機械本体の負担も軽くなる。また、回転駆動源を移動させる必要がないことにより、直進駆動源の電流値と押圧力との関係に、誤差が生じにくくなる。
【図面の簡単な説明】
【図１】本発明の摩擦攪拌接合装置を摩擦攪拌接合装置２０に適用した実施の一形態を示す図である。
【図２】摩擦攪拌接合装置２０の回転押圧機構３２の構造を示す図である。
【図３】直線伝達機構４３の他の形態を示す図である。
【図４】本発明の他の実施形態の回転押圧機構１００の構造を示す図である。
【図５】本発明のさらに他の実施形態の回転押圧機構１２０の構造を示す図である。
【図６】本発明のさらに他の実施形態の回転押圧機構１３０の構造を示す図である。
【図７】従来の摩擦攪拌接合装置１を示す図である。
【符号の説明】
２３加工機械本体
２０摩擦攪拌接合装置
３０支持フレーム
３１回転子
３２，１００，１２０，１３０回転押圧機構
３４ピン
４０サーボモータ
４１インダクションモータ
４２回転伝達手段
４３直進伝達手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a friction stir welding apparatus that softens and stirs an object to be joined by frictional heat generated by rotation and joins the objects by stirring.
[0002]
[Prior art]
FIG. 7 is a front view showing a proposed friction stir welding apparatus 1. In this friction stir welding apparatus 1, the rotor 3 having the pin 2 at the tip is pressed against the work while rotating at high speed, and the joint between the pin 2 and the work is softened by the frictional heat generated by the rotation and stirred by the rotation. And join. That is, the friction stir welding apparatus 1 includes a rotation drive source 4 that rotates the rotor 3 around its axis at a high speed, and a rectilinear drive source 5 that moves the rotor 3 straight along the rotation axis. The friction stir welding apparatus 1 includes a support frame 6, a linear slider 7, and a ball screw 8, and the support frame 6 is held by the processing machine body.
[0003]
The linear slider 7 is fixed to the support frame 6. A rotor 3 that is rotatably supported and a rotational drive source 4 that rotationally drives the rotor 3 are attached to the guide portion of the linear slider 7 that is guided in a straight line. The ball screw 8 is fixed to the support frame 6 in parallel with the linear slider 7, and a nut member 9 screwed to the screw shaft 10 of the ball screw 8 is connected to the slide member of the linear guide 7. Therefore, when the screw shaft 10 of the ball screw 8 is rotationally driven by the linear drive source 5 such as a servo motor, the nut member 9 moves straight up and down along the screw shaft 10. The slide member attached to the nut member 9 moves straight along with the rotor 3 and the rotation drive source 4.
[0004]
With this configuration, the rotor 3 can be moved straight while rotating.
[0005]
[Problems to be solved by the invention]
In the friction stir welding apparatus 1 described above, the rotary drive source 4 for rotationally driving the rotor 3 is slid by the linear drive source 5 and pressed against the work, so a large-capacity linear drive source is required. There is a problem that the entire apparatus becomes large. This also led to an increase in cost. Furthermore, the load weight of the processing machine main body equipped with such a heavy friction stir welding apparatus 1 is also increased.
[0006]
Further, in the structure using the ball screw 8 and the linear slider 7, the screw shaft 10 of the ball screw 8 that generates a straight driving force and the axis of the rotor 3 that receives a load from the workpiece when pressed are shown in FIG. As indicated by the reference symbol W, they are separated by a distance W. If the linear drive shaft and the load shaft are separated from each other as described above, a bending moment is generated at the time of pressing, which tends to cause looseness, and there is a problem in durability.
[0007]
Also, the pressing force of the rotor may be detected based on the current value of the servo motor that is the linear drive source 5, but when the play occurs as described above, the current value fluctuates and the pressing force is accurately detected. The problem that it becomes impossible to occur.
[0008]
Further, since the linear drive source 5 moves the rotary drive source 4 linearly together with the rotor 3, the pressing force of the rotor 3 by the linear drive source 5 and the current value of the linear drive source 4 by the weight of the rotary drive source 4. There is a problem that an error is given to the relationship.
[0009]
An object of the present invention is to provide a friction stir welding apparatus configured so that a rotational drive source is not moved by a linear drive source and a bending moment is not generated at the time of pressing.
[0011]
[Means for Solving the Problems]
In the present invention, the rotor rotating at high speed is moved in the rotation axis direction, the tip is pressed against the workpiece, the contact portion of the workpiece is softened by the frictional heat generated by the rotation of the tip, and stirred. In a friction stir welding apparatus for joining workpieces,
A rotational drive source consisting of a servo motor that rotates the rotor around the rotational axis at high speed;
A rectilinear drive source consisting of a servomotor that moves the rotor linearly in the direction of the rotation axis;
A support member that supports each of the rotational drive source and the straight drive source, and supports the rotor movably in the rotation axis direction;
A rotation transmitting means that allows movement of the rotor in the direction of the rotation axis and transmits a rotational driving force from the rotational driving source to the rotor;
A friction stir welding apparatus comprising: a rectilinear transmission means that permits rotation of the rotor and transmits a rectilinear driving force from a rectilinear driving source coaxially to the rotor.
[0012]
In the present invention, the rotor that rotates at a high speed is moved in the direction of the rotation axis, the tip is pressed against the workpiece, the contact portion of the workpiece is softened by the frictional heat generated by the rotation of the tip, and stirred. To join the objects to be joined,
In the friction stir welding device equipped in the processing machine body,
A rotational drive source consisting of a servo motor that rotates the rotor around the rotational axis at high speed;
A rectilinear drive source consisting of a servomotor that moves the rotor linearly in the direction of the rotation axis;
A support member that supports each of the rotational drive source and the straight drive source, and supports the rotor movably in the rotation axis direction;
A rotation transmitting means that allows movement of the rotor in the direction of the rotation axis and transmits a rotational driving force from the rotational driving source to the rotor;
A linear transmission means for allowing the rotation of the rotor and transmitting the linear driving force from the linear driving source coaxially to the rotor;
The support member is fixed to the processing machine body,
The processing machine main body is a friction stir welding apparatus characterized by causing a relative motion between the rotor and the workpiece to be joined in an arbitrary length in a direction perpendicular to the rotation axis.
[0013]
According to the present invention, the rotational driving force of the rotor is transmitted to a side surface of the rotor.
[0014]
According to the present invention, the rotational driving force of the rotor is transmitted to one end of the rotor.
[0015]
According to the present invention, the rotational drive source that rotates the rotor transmits the rotational force by the rotational transmission means that transmits the rotational force in a state in which the displacement of the rotor in the rotational axis direction is allowed. The rotor can be linearly moved by a linear drive source while rotating the rotor while being fixed to the support member. As a result, the linear drive source only needs to move only the rotor in a straight line, and it is not necessary to move the rotary drive source, so the capacity of the linear drive source can be reduced and the size can be reduced. As a result, the burden on the processing machine main body holding the friction stir welding apparatus is reduced. Further, since it is not necessary to move the rotational drive source, an error is less likely to occur in the relationship between the current value of the linear drive source and the pressing force.
[0016]
Further, the rotational force of the rotational drive source may be transmitted from the side surface of the rotor or may be transmitted from the end portion.
[0022]
Moreover, this invention is (a ) Rotor holding member 70,
Has a rotor insertion hole 72 of the rotor body 36 of the rotating element is inserted, has a lower end portion which holds the rotating element,
A rotor holding member 70 in which a plurality of splines 76 extending in parallel to the axis L are formed on the outer periphery of the lower end;
( B ) a rotation support member 73,
A first spline receiver 75 in which the spline 76 is fitted on the inner peripheral side;
A first spline receiving 75, the supporting member, rotatably supported on the around the axis L, and a rotation support member 73 having a first bearing 74 that is mounted to a support member,
The rotary drive source comprises a rotary drive motor 41 is fixedly supported by the support member,
The rotation transmission means allows the movement of the rotor in the direction of the rotation axis, transmits the rotation driving force from the rotation driving motor 41 to the rotor holding member 70,
The linear drive source includes a linear drive motor 40 fixedly supported by a support member,
The straight-advance transmission means to permit rotation of the rotor, characterized in that it transmitted to the coaxial rectilinear driving force from the linear drive motor 40 to the upper end portion of the rotor retaining member 70.
[0023]
In the present invention, the support member is fixed to the processing machine main body,
The processing machine main body is characterized in that the rotor and the object to be joined are caused to move relative to each other by an arbitrary length in a direction perpendicular to the rotation axis.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing a friction stir welding apparatus 20 according to an embodiment of the present invention. The friction stir welding apparatus 20 is installed in the processing machine main body 23.
[0025]
The friction stir welding apparatus 20 includes a support frame 30 that is a support member, a rotor 31, and a rotation pressing mechanism 32. The support frame 30 is fixed to the processing machine main body 23 and holds the rotation pressing mechanism 32. The rotation pressing mechanism 32 rotates the rotor 31 around the axis L at a high speed and linearly moves in the direction of the rotation axis L. Further, a receiving portion 33 that faces the tip of the rotor 31 is provided separately. The rotor 31 is tapered at the tip side (see FIG. 2), and a cylindrical portion 35 coaxial with the rotation axis L is formed at the tip, and a pin 34 projects from the lower end surface along the rotation axis L.
[0026]
For example, when two workpieces such as an aluminum alloy plate are joined, the two workpieces are overlapped, and the receiving portion 33 of the friction stir welding apparatus 20 is disposed below the joining portion. Next, the rotor 31 is rotated at a high speed by the rotation pressing mechanism 32 and the rotor 31 is moved forward. Then, two workpieces are sandwiched between the receiving portion 33 and the rotor 31, and the pin 34 at the tip of the rotor 31 is pressed against the joint portion of the workpiece. By being pressed while rotating, frictional heat is generated, the vicinity of the joint is softened, and the pin 34 is inserted.
[0027]
By inserting the pin 34 while rotating, plastic flow is caused in the vicinity of the joint, and the pin 34 is agitated. Further, when the pin 34 is inserted and the lower end surface (shoulder portion) of the cylindrical portion 35 of the rotor 31 is pressed against the work surface, the work surface is also stirred by the lower end surface. In this way, the pin 34 is inserted until it exceeds the joint of the two workpieces, and is pressed and stirred for a predetermined time with a predetermined pressing force. During or during joining, the processing machine main body 23 causes the rotor 31 and the workpiece to move relative to each other in a direction perpendicular to the rotation axis L in accordance with the application content of the joining. Thereafter, the rotor 31 is retracted along the rotation axis L by the rotation pressing mechanism 32. When the pin 34 is pulled out, the vicinity of the joint portion that has been agitated and caused plastic flow is cooled and hardened, and two workpieces are joined at the joint portion.
[0028]
FIG. 2 is a diagram illustrating a configuration of the rotary pressing mechanism 32 of the friction stir welding apparatus 20. The rotor 31 includes a rotor main body 36 and a rotor holding member 70 that holds the rotor 31, and the rotation pressing mechanism 32 includes an induction motor 41 and a rotor 31 that are rotational drive sources that rotationally drive the rotor 31. Servo motor 40 that is a linear drive source for linearly moving the motor, rotation transmission means 42 that transmits the rotational force from the induction motor 41 to the rotor holding member 70, and the linear drive force of the servo motor 40 to the rotor holding member 70. And a straight transmission means 43 for transmission.
[0029]
The support frame 30 fixedly supports the servo motor 40 and the induction motor 41, and supports the rotor holding member 70 through the rotation support member 73. The rotor holding member 70 has a plurality of splines 76 extending in parallel to the rotation axis L on the outer periphery, and the rotation support member 73 has a spline receiver 75 in which the splines 76 are fitted on the inner periphery side. A bearing 74 is provided, and the bearing 74 is attached to the support frame 30. With such a configuration, the rotor holding member 70 is supported by the support frame 30 so as to be rotatable about the rotation axis L and movable in the direction of the rotation axis L.
[0030]
The rotor holding member 70 has a columnar shape, and a rotor insertion hole 72 is formed at a lower end portion. The rotor body 36 is inserted into the rotor insertion hole 72, and the rotation around the rotation axis L and the rotation axis L The movement in the direction is blocked and held by the rotor holding member 70.
[0031]
The rotation transmission means 42 connects the first belt wheel 61, the V belt 62, the second belt wheel 63, the spline shaft 66, the spline shaft 66 and the second belt wheel 63 fixed to the output shaft 67 of the induction motor 41. The universal joint 64 is comprised. A spline hole 71 having an inner spline is formed at the upper end of the rotor holding member 70 coaxially with the rotation axis L, and the spline shaft 64 is inserted into the spline hole 71. As a result, the spline shaft 64 and the rotor holding member 70 are coupled in a state where the spline shaft 64 and the rotor holding member 70 can move linearly in the direction of the axis L and are prevented from rotating around the axis L.
[0032]
The second belt wheel 63 is supported by the support frame 30 so as to be rotatable around the axis L by a bearing 65, and a V belt 62 is wound around the first belt wheel 61 from the second belt wheel 63. And the spline shaft 81 are connected via a universal joint 64. The rotational force of the induction motor 41 is transmitted to the rotor 31 by the rotation transmission means 42 having such a configuration.
[0033]
The rectilinear transmission means 43 includes a toothed belt wheel 45 fixed to the output shaft 44 of the servo motor 40, a timing belt 46, and a nut member 47, and a linear member 48 is connected to the rectilinear transmission means 43. . The rectilinear member 48 includes a screw shaft 49 into which the nut member 47 is screwed, and a connecting member 50 fixed to the lower end portion of the screw shaft 49 and connected to the upper end portion of the rotor holding member 70. The lower end portion of the connecting member 50 is configured such that the rotor holding member 70 can rotate around the axis L via a pair of bearings 80, and the connecting member 50 and the rotor holding member 70 are prevented from moving in the direction of the rotation axis L. It is connected in the state that was done. A plurality of outer splines 82 extending in a direction parallel to the rotation axis L are provided on the outer peripheral portion of the lower end portion of the connecting member 50, and a spline receiver 83 into which the outer splines 82 are fitted is fixed to the support frame 30. The Thereby, the connection member 50 is provided so as to be prevented from rotating around the rotation axis L and movable in the direction of the rotation axis L.
[0034]
A screw shaft 49 is fixed to the upper end portion of the connecting member 50, and the screw shaft 49 is disposed coaxially with the rotation axis L. The nut member 47 screwed into the screw shaft 49 is a ball screw, and is supported rotatably around the rotation axis L via the bearing 52, and the bearing 52 is fixed to the support frame 30. A toothed belt wheel 51 is integrally fixed to the upper end portion of the nut member 47, and the timing belt 46 is wound around the toothed belt wheel 45 attached to the servo motor 40 from the toothed belt wheel 51.
[0035]
Next, the operation of the straight transmission means 43 will be described. When the servo motor 40 is rotated, the nut member 47 is rotated via the toothed belt wheel 45 and the timing belt 46. Since the nut member 47 is fixedly held in the direction of the rotation axis L with respect to the support frame 30, the screw shaft 49 moves forward (lowers) by the rotation of the nut member 47. Since the connecting member 50 fixed to the lower end portion of the screw shaft 49 is connected to the rotor holding member 70 while being rotatable and prevented from moving in the direction of the rotation axis L, the rotor holding member 70 is rotatable. Move forward in a safe state. When the servo motor 40 is reversed, the rotation direction of the nut member 47 is also reversed, and the rotor 31 is retracted (raised).
[0036]
The rotation transmitting means 42 is configured to be movable in the direction of the rotation axis L by the spline shaft 64 and to transmit the rotational force around the rotation axis L to the rotor holding member 70, so that the rotor holding member 70 is advanced. , Can be rotated while retreating.
[0037]
In this way, by rotating the rotor 31 at a high speed by the induction motor 41, the servo motor 40 moves forward in the direction of the rotation axis L, presses the tip of the rotor 31 against the workpiece, and reverses the servo motor 40. The rotor 31 can be moved backward while rotating. At this time, since the screw shaft 49 is coaxial with the rotation axis L of the rotor 31, the linear member 48 of the linear transmission means 43 that applies a linear force to the rotor has a bending moment when pressed as in the prior art described above. Is prevented from occurring. Further, the servo motor 40 that is a linear drive source does not need to move the induction motor 41 that is a rotary drive source together with the rotor as in the prior art, so that the motor capacity of the servo motor 40 can be small, and the servo motor 40 can be reduced in size and weight.
[0038]
In the friction stir welding apparatus 20, the pressing force is detected based on the current value of the servo motor 40, but since no bending moment is generated during pressing, an error occurs in the relationship between the current value of the servo motor and the pressing force. It becomes difficult.
[0039]
In the straight transmission means 43 shown in FIG. 2, the nut member 47 is provided on the support frame 30 so as to be rotatable around the rotation axis L and prevented from moving in the direction of the rotation axis L. By rotating the nut member 47, the nut member 47 is rotated. The screw shaft 49 of the rectilinear member is configured to move forward and backward, but may be configured in reverse. That is, as shown in FIG. 3, the screw shaft 92 is rotatably supported by the bearing 94, the lower end portion is connected to the rotor holding member 70 as a rectilinear member, and the nut member 91 is screwed to the screw shaft 92 at the upper end portion. The connecting member 90 having the above structure is provided, the toothed belt wheel 93 is fixed to the screw shaft 92, and the screw shaft 92 is rotated via the timing belt 46, whereby the connecting member 90 provided integrally with the nut member 91 is advanced. You may comprise so that it may reverse | retreat.
[0040]
FIG. 4 is a view showing the structure of the rotary pressing mechanism 100 of the friction stir welding apparatus according to another embodiment of the present invention. In the rotary pressing mechanism 32 shown in FIGS. 2 and 3, the rotational driving force and the straight driving force are transmitted from one end of the rotor 31. However, in the rotary pressing mechanism 100 of this embodiment, the rotational driving force is not transmitted. Input from one end of the rotor 31, and rotational force is transmitted to the side surface of the rotor 31.
[0041]
Next, the configuration of the rotary pressing mechanism 100 of the present embodiment will be described in detail. In addition, the same reference number is attached | subjected to the structure corresponding to the rotary press mechanism 32 mentioned above, and description is abbreviate | omitted.
[0042]
The rectilinear member 101 connected to the rectilinear transmission means 110 of the present embodiment has a cylindrical shape and is disposed so as to surround the upper end portion of the rotor holding member 70 coaxially with the rotation axis L. The linearly moving member 101 and the rotor holding member 70 are relatively rotatable around the rotation axis L via bearings 102 and 103 provided at both upper and lower ends of the cylindrical linearly moving member 101, and are in the direction of the rotation axis L. The movement to is blocked and connected. An external thread is formed on the outer periphery of the rectilinear member 101, and the nut member 104 is screwed onto the external thread.
[0043]
The nut member 104 is supported by the support frame 30 via a pair of bearings 105 and 106 so as to be rotatable around the rotation axis L and prevented from moving in the direction of the rotation axis L. Further, teeth are formed on the outer periphery of the nut member 104 to function as a toothed belt wheel. Therefore, when the timing belt 46 is wound around the nut member 104 from the toothed belt wheel 45 of the servo motor 40, the rotational driving force of the servo motor 40 is transmitted to the rectilinear member 101.
[0044]
A guide groove 107 is formed in the outer peripheral portion of the rectilinear member 101 in parallel with the rotation axis L, and an annular detent member 108 surrounding the rectilinear member 101 is provided above the nut member 104 in the support frame 30. The anti-rotation member 108 is formed with an anti-rotation protrusion 109 that protrudes inward and fits into the guide groove 107 of the rectilinear member 101. As a result, the rectilinear member 101 can move in the direction of the rotation axis L and is prevented from rotating around the rotation axis L.
[0045]
The induction motor 41 has a spline shaft 64 connected to an output shaft 67 via a universal joint 64. The spline shaft 64 and the rotor holding member 70 are prevented from rotating about the rotation axis L, and the rotation axis It is connected so as to be movable in the L direction.
[0046]
When the servo motor 40 is driven to rotate, the nut member 104 rotates around the rotation axis L via the toothed belt wheel 45 and the timing belt 46, and the rotor is held via the rectilinear member 101 by the rotation of the nut member 104. The member 70 and the rotor 31 move straight in the direction of the rotation axis L. In this way, the linear force from the servo motor 40 that is the linear drive source is transmitted from the side surface of the linear member 107.
[0047]
The rotational force from the induction motor 41 is transmitted by the spline shaft 64 so as to be movable in the direction of the rotational axis L, whereby the rotor 31 moves linearly in the direction of the rotational axis L while rotating around the rotational axis L. be able to. In this way, the rotational force is transmitted from one end of the rotor 31.
[0048]
Also in this embodiment, it is possible to prevent the induction motor 41 that is a rotational drive source from moving. Further, since the rectilinear member 48 that applies a rectilinear force to the rotor 31 is arranged coaxially with the rotation axis L, it is possible to prevent a bending moment from acting when pressed.
[0049]
FIG. 5 is a diagram showing a configuration of the rotary pressing mechanism 120 of the friction stir welding apparatus according to still another embodiment of the present invention. In the rotation pressing mechanism 120, the rotational force from the induction motor 41 is transmitted from the side surface of the rotor 31, and the straight traveling force from the servo motor 40 is transmitted from the upper end portion of the rotor 31. The same components as those shown in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof is omitted.
[0050]
The rotation pressing mechanism 120 includes a straight transmission means 43 similar to the rotation pressing mechanism 32 described in FIG. However, since the rotation transmission means 121 of the present embodiment transmits the rotational force from the side surface of the rotor holding member 70, the connecting member 50 of the straight transmission means 43 does not need to avoid the timing belt 62 of the rotation transmission means. Therefore, the structure of the connecting member 50 can be reduced.
[0051]
A plurality of splines 122 are formed in parallel to the rotation axis L on the outer periphery of the rotor holding member 70. The rotational force transmission means 121 includes a V belt wheel 61, a V belt 62, and a spline receiver 123 that are fixed to the output shaft of the induction motor 41. The spline receiver 123 has an annular shape and is fitted into the spline 122 of the rotor holding member 70. The spline receiver 123 and the rotor holding member 70 are prevented from rotating around the rotation axis L and in the direction of the rotation axis L. It is movably connected to. The spline bearing 123 is supported by the support frame 30 by a pair of upper and lower bearings 124 and 125 so as to be rotatable around the rotation axis L and prevented from moving in the direction of the rotation axis L. Moreover, the outer peripheral part of the spline receiver 123 functions as a belt wheel, and the V belt 62 is wound around the outer peripheral part.
[0052]
With such a configuration, the rotational force of the induction motor 41 rotationally drives the spline receiver 123, the rotor holding member 70, and the rotor 31 around the rotation axis L via the V belt wheel 61 and the V belt 62. Further, since the rotor holding member 70 is supported so as to be able to move linearly, it can move linearly while being rotated by the linear force from the linear transmission means 43.
[0053]
Also in this embodiment, it is possible to prevent the induction motor 41 that is a rotational drive source from moving. Further, since the rectilinear member 48 that applies a rectilinear force to the rotor 31 is arranged coaxially with the rotation axis L, it is possible to prevent a bending moment from acting when pressed.
[0054]
Further, the linear transmission means 43 of the present embodiment may be configured such that a nut member is fixed to the linear member and the screw shaft side is rotated, similarly to the configuration described in FIG.
[0055]
FIG. 6 is a diagram showing a configuration of the rotary pressing mechanism 130 of the friction stir welding apparatus according to still another embodiment of the present invention. In the rotary pressing mechanism 130, the straight advance force and the rotational force are transmitted from the side surface of the rotor 31. That is, the linear transmission means 110 described in FIG. 4 and the rotation transmission means 121 described in FIG. 5 are included. The same components as those shown in FIGS. 1 to 5 are denoted by the same reference numerals, and the description thereof is omitted.
[0056]
Also in this embodiment, it is possible to prevent the induction motor 41 that is a rotational drive source from moving. Further, since the rectilinear member 101 that applies a rectilinear force to the rotor 31 is arranged coaxially with the rotation axis L, it is possible to prevent a bending moment from acting when pressed.
[0057]
In each of the above-described embodiments, the induction motor is used as the rotational drive source. However, the present invention is not limited to this, and the rotational drive source may be a servo motor. At this time, the rotation transmission means uses a timing belt instead of the V belt.
[0058]
【The invention's effect】
As described above, according to the present invention, the rotational drive source that rotates the rotor transmits the rotational force by the rotational transmission means that transmits the rotational force in a state where the displacement of the rotor in the rotational axis direction is allowed. In a state where the rotation drive source is fixed to the support member, the rotor can be moved linearly by the linear drive source while rotating the rotor. As a result, the linear drive source only needs to move only the rotor in a straight line, and it is not necessary to move the rotary drive source, so the capacity of the linear drive source can be reduced and the size can be reduced. As a result, the burden on the processing machine main body holding the friction stir welding apparatus is reduced. Further, since it is not necessary to move the rotational drive source, an error is less likely to occur in the relationship between the current value of the linear drive source and the pressing force.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment in which a friction stir welding apparatus according to the present invention is applied to a friction stir welding apparatus 20;
FIG. 2 is a view showing a structure of a rotary pressing mechanism 32 of the friction stir welding apparatus 20;
3 is a view showing another form of the linear transmission mechanism 43. FIG.
FIG. 4 is a diagram showing a structure of a rotary pressing mechanism 100 according to another embodiment of the present invention.
FIG. 5 is a diagram showing a structure of a rotary pressing mechanism 120 according to still another embodiment of the present invention.
FIG. 6 is a view showing a structure of a rotary pressing mechanism 130 according to still another embodiment of the present invention.
7 is a view showing a conventional friction stir welding apparatus 1. FIG.
[Explanation of symbols]
23 Processing Machine Body 20 Friction Stir Welding Device 30 Support Frame 31 Rotors 32, 100, 120, 130 Rotating Press Mechanism 34 Pin 40 Servo Motor 41 Induction Motor 42 Rotation Transmitting Means 43 Straight Traveling Transmitting Means

Claims

The rotor rotating at high speed is moved in the direction of the rotation axis, the tip is pressed against the workpiece, the contact portion of the workpiece is softened by the frictional heat generated by the rotation of the tip, and the workpiece is agitated by stirring. In the friction stir welding apparatus to join,
A rotational drive source consisting of a servo motor that rotates the rotor around the rotational axis at high speed;
A rectilinear drive source consisting of a servomotor that moves the rotor linearly in the direction of the rotation axis;
A support member that supports each of the rotational drive source and the straight drive source, and supports the rotor movably in the rotation axis direction;
A rotation transmitting means that allows movement of the rotor in the direction of the rotation axis and transmits a rotational driving force from the rotational driving source to the rotor;
A friction stir welding apparatus, comprising: a linear transmission means that allows rotation of the rotor and transmits a linear driving force from a linear driving source coaxially to the rotor.

The rotor rotating at high speed is moved in the direction of the rotation axis, the tip is pressed against the workpiece, the contact portion of the workpiece is softened by the frictional heat generated by the rotation of the tip, and the workpiece is agitated by stirring. Joined,
In the friction stir welding device equipped in the processing machine body,
A rotational drive source consisting of a servo motor that rotates the rotor around the rotational axis at high speed;
A rectilinear drive source consisting of a servomotor that moves the rotor linearly in the direction of the rotation axis;
A support member that supports each of the rotational drive source and the straight drive source, and supports the rotor movably in the rotation axis direction;
A rotation transmitting means that allows movement of the rotor in the direction of the rotation axis and transmits a rotational driving force from the rotational driving source to the rotor;
A linear transmission means for allowing the rotation of the rotor and transmitting the linear driving force from the linear driving source coaxially to the rotor;
The support member is fixed to the processing machine body,
A friction stir welding apparatus characterized in that a processing machine main body causes a relative motion between a rotor and a workpiece to be bonded by an arbitrary length in a direction perpendicular to the rotation axis.

The friction stir welding apparatus according to claim 1 or 2, wherein the rotational driving force of the rotor is transmitted to a side surface of the rotor.

The friction stir welding apparatus according to claim 1 or 2, wherein the rotational driving force of the rotor is transmitted to one end of the rotor.

(A ) a rotor holding member 70,
Has a rotor insertion hole 72 of the rotor body 36 of the rotating element is inserted, has a lower end portion which holds the rotating element,
A rotor holding member 70 in which a plurality of splines 76 extending in parallel to the axis L are formed on the outer periphery of the lower end;
( B ) a rotation support member 73,
A first spline receiver 75 in which the spline 76 is fitted on the inner peripheral side;
A first spline receiving 75, the supporting member, rotatably supported on the around the axis L, and a rotation support member 73 having a first bearing 74 that is mounted to a support member,
The rotary drive source comprises a rotary drive motor 41 is fixedly supported by the support member,
The rotation transmission means allows the movement of the rotor in the direction of the rotation axis, transmits the rotation driving force from the rotation driving motor 41 to the rotor holding member 70,
The linear drive source includes a linear drive motor 40 fixedly supported by a support member,
The straight-advance transmission means to permit rotation of the rotor, the friction of claim 1, wherein the transmitting coaxial rectilinear driving force from the linear drive motor 40 to the upper end portion of the rotor retaining member 70 Stir welding device.

The support member is fixed to the processing machine body,
The friction stir welding apparatus according to claim 5 , wherein the processing machine main body causes a relative motion between the rotor and the workpiece to be bonded by an arbitrary length in a direction perpendicular to the rotation axis.