JP4051223B2

JP4051223B2 - Pull stud and tool holder

Info

Publication number: JP4051223B2
Application number: JP2002138568A
Authority: JP
Inventors: 雄策山本; 弘英釘宮
Original assignee: 株式会社日研工作所
Priority date: 2002-05-14
Filing date: 2002-05-14
Publication date: 2008-02-20
Anticipated expiration: 2022-05-14
Also published as: JP2003334738A

Description

【０００１】
【発明の属する技術分野】
本発明は、切削工具を掴持した工具ホルダを工作機械の主軸に挿着するためのプルスタッド、及びこのプルスタッドを利用して工作機械側から主軸の中心を通して供給される切削液を切削工具及び該切削工具により切削される被加工物の切削箇所に供給できるようにした工具ホルダに関するものである。
【０００２】
【従来の技術】
マシニングセンタなどの工作機械において、被加工物の所定箇所を所定の工具、例えばドリルやエンドミル等の切削工具により切削加工する場合は、これらの切削工具を掴持した工具ホルダを工作機械の主軸に装着し、工作機械側から主軸の中心を通して供給されるクーラントや切削油等の切削液を工具ホルダの供給穴及びコレットのスリ割り部、あるいは切削工具の軸方向に貫通する中心部に形成した給油穴を通して切削工具の刃先及び被加工物の切削箇所に供給し、これにより被加工物の切削加工性を向上できるようにしている。
【０００３】
ところで、切削工具の刃先及び被加工物の切削箇所への切削液の供給量は、被加工物に対する切削加工形態により変更する必要がある。例えば、エンドミル加工やドリル加工または荒ボーリング加工などの場合は、切削工具の刃先から突出される切削液の流量及び圧力を比較的大きく設定し、また、仕上げボーリング加工やタッピング加工などの場合は、切削工具の刃先から突出される切削液の流量及び圧力を比較的小さく設定するようにしている。そして、これら切削液の流量調整は、工作機械側の切削液供給装置に設けられた流量調整手段を操作することにより行われるように構成されていた。
【０００４】
【発明が解決しようとする課題】
しかしながら、上記のような従来の方式では、工作機械側の切削液供給装置に設けられた流量調整手段を操作することにより切削液の流量を調整するものであるため、工作機械の主軸に工具ホルダを介して装着される切削工具の種類及び加工形態に応じて、その都度、流量調整手段により切削液の流量を調整し直す必要があり、その調整操作が煩雑になるとともに流量調整手段の規模も大型化してコスト高になる問題がある。
また、切削工具の種類及び加工形態に応じた切削液の流量設定は主に手動で行われるため、その流量設定が適正になされない場合、例えば、エンドミル加工やドリル加工のように切削液の流量を大きく設定しなければならない時に切削液の流量設定が不足した場合には被加工物の切削加工性に支障を来たすことがあり、また、仕上げボーリング加工のように切削液の流量を小さく設定しなければならない時に切削液の流量が過剰に設定された場合には仕上げの穴形状（真円度、面粗度）が悪化するなどの不具合があった。
【０００５】
本発明は、上記のような従来の問題を解決するためになされたもので、切削工具の種類及び加工形態に応じた切削液の流量設定を簡便に、かつ低コストに実現できるようにしたプルスタッド、及びこのプルスタッドを用いた工具ホルダを提供することを目的とする。
【０００６】
【課題が解決するための手段】
上記目的を達成するために請求項１の発明は、切削工具を掴持した工具ホルダを工作機械の主軸に挿着するためのプルスタッドであって、前記工作機械の主軸を通して供給される切削液を前記工具ホルダ内へ導入する流体通路が全長に亘り形成されたスタッド本体を備え、前記流体通路には該流体通路を通過する切削液の流量を切削工具の種類及び被加工物の加工形態に応じて調整する流量調整部材が設けられおり、前記流量調整部材は、軸心に流量設定用貫通孔を有するネジ部材から構成され、前記ネジ部材は前記スタッド本体に前記流体通路と連通するように設けた雌ネジ穴に交換可能に螺着されると共に、前記ネジ部材の一端には、該ネジ部材を螺合操作するための工具が係合される係合部が形成されていることを特徴とする。
【０００７】
請求項２の発明は、請求項１記載のプルスタッドにおいて、前記流量設定用貫通孔の径は前記切削工具の種類及び被加工物の加工形態に適合するように設定されることを特徴とする。
【０００８】
請求項３の発明は、請求項１記載のプルスタッドにおいて、前記流量調整部材は、前記スタッド本体の一端部に前記流体通路と同心に形成した前記流体通路より大きい径の雌ネジ穴に着脱可能に螺合されるネジ部材から構成され、前記ネジ部材の前記雌ネジ穴への螺入側先端には前記雌ネジ穴に連通する前記流体通路の開口部の開口面積を調節して流量を調整する円錐部が形成され、さらに前記ネジ部材には前記開口部から前記雌ネジ穴内に流入された切削液をスタッド本体外へ流出させる流通路が形成されていることを特徴とする。
請求項４の発明は、請求項１記載のプルスタッドにおいて、前記ネジ部材は前記雌ネジ穴への螺合位置を安定に保持する保持機構を備えることを特徴とする。
【０００９】
請求項５の発明は、一端に工作機械の主軸に挿着されるシャンク部を有し他端に工具取着部を有するホルダ本体と、前記ホルダ本体内に前記シャンク部の後端から前記工具取着部へ貫通するように形成された孔部と、前記シャンク部の後端に結合されたプルスタッドとを備える工具ホルダであって、前記プルスタッドは前記工作機械の主軸を通して供給される切削液が前記工具ホルダ内へ導入されるように全長に亘り形成された流体通路を有するスタッド本体を備え、前記流体通路には該流体通路を通過する切削液の流量を切削工具の種類及び被加工物の加工形態に応じて調整する流量調整部材が設けられており、前記流量調整部材は、軸心に流量設定用貫通孔を有するネジ部材から構成され、前記ネジ部材は前記スタッド本体に前記流体通路と連通するように設けた雌ネジ穴に交換可能に螺着されると共に、前記ネジ部材の一端には、該ネジ部材を螺合操作するための工具が係合される係合部が形成されていることを特徴とする。
請求項６の発明は、請求項５記載の工具ホルダにおいて、前記流量設定用貫通孔の径は前記切削工具の種類及び被加工物の加工形態に適合するように設定されることを特徴とする。
【００１０】
請求項７の発明は、請求項５記載の工具ホルダにおいて、前記流量調整部材は、前記スタッド本体の一端部に前記流体通路と同心に形成した前記流体通路より大きい径の雌ネジ穴に着脱可能に螺合されるネジ部材から構成され、前記ネジ部材の前記雌ネジ穴への螺入側先端には前記雌ネジ穴に連通する前記流体通路の開口部の開口面積を調節して流量を調整する円錐部が形成され、さらに前記ネジ部材には前記開口部から前記雌ネジ穴内に流入された切削液をスタッド本体外へ流出させる流通路が形成されていることを特徴とする。
【００１１】
請求項８の発明は、請求項５記載の工具ホルダにおいて、前記ネジ部材は前記雌ネジ穴への螺合位置を安定に保持する保持機構を備えることを特徴とする。
【００１２】
【発明の実施の形態】
以下、本発明にかかるプルスタッド、及びこのプルスタッドを用いた工具ホルダの実施の形態について図面を参照して説明する。
図１は本発明にかかるプルスタッドを用いた工具ホルダの一実施の形態を示す縦断側面図、図２はこの一実施の形態におけるプルスタッドの拡大断面図である。
【００１３】
図１において、この実施の形態に示す工具ホルダ１０はホルダ本体１１を有し、このホルダ本体１１は、工作機械の主軸８に設けたテーパ孔８ａに係脱可能に嵌合されるテーパシャンク部１２と、このテーパシャンク部１２の大径側端部に形成した掴持用のフランジ１３と、このフランジ１３の反テーパシャンク部側の端面からテーパシャンク部１２と反対の方向に該テーパシャンク部１２の軸線と一致して延設され、外周面にフランジ１３から先端に行くに従い径が小さくなるテーパ面１４ａが形成された円筒形状のチャック筒１４とを備えている。
また、ホルダ本体１１の軸心部にはテーパシャンク部１２の後端からチャック筒１４内へ貫通する孔部１１ａが形成されている。この孔部１１ａの後端寄りの内周箇所には雌ネジ部１１ｂが形成されている。なお、チャック筒１４は、請求項に記載した工具取着部を構成する。
また、チャック筒１４が連接されるフランジ１３の端面１３ａには、チャック筒１４の径方向への弾性変形を容易にするためにチャック筒１４の有効長を拡大するリング状溝１３ｂが形成されている。
【００１４】
図１において、１５は前記チャック筒１４の外周に遊嵌されるローラ保持筒であり、このローラ保持筒１５は、チャック筒１４のテーパ面１４ａとほぼ同様なテーパ角度で先端に行くに従い径が小さくなる筒体から形成されている。また、このローラ保持筒１５は、チャック筒１４の先端部外周に設けた止めリング１６によってチャック筒１４から抜け落ちないように保持されている。
【００１５】
前記ローラ保持筒１５には、該ローラ保持筒１５の軸線に対して円周方向に所定の角度傾斜させて嵌め込んだニードルローラ１７が円周方向に多数配設されている。この各ニードルローラ１７はローラ保持筒１５の肉厚寸法より大きい径に形成され、これにより、ローラ保持筒１５の内周面側へ突出する各ニードルローラ１７はチャック筒１４のテーパ面１４ａに当接され、ローラ保持筒１５の外周面側へ突出する各ニードルローラ１７は後述する締付筒１８の内周面に当接される構成になっている。
【００１６】
前記締付筒１８は、チャック筒１４を縮径させることにより、チャック筒１４内に挿入された切削工具２０のシャンク部２０ａを緊密に掴持するもので、チャック筒１４の外周にローラ保持筒１５で保持されたニードルローラ１７を介して嵌合される。また、この締付筒１８の内周面は、フランジ１３と対向する端部から先端に行くに従い径が小さくなるテーパ付き円筒面に構成されている。さらに、締付筒１８のフランジ１３側の基端部内周には、シール兼用の抜け止めリング１９が装着されており、このシール兼用の抜け止めリング１９はチャック筒１４の外周面に当接することによりシール機能を発揮し、また、ローラ保持筒１５の端面に当接することで締付筒１８のチャック筒１４からの抜け落ちを防止する。なお、ローラ保持筒１５、ニードルローラ１７及び締付筒１８は、請求項に記載したチャック機構を構成する。
【００１７】
前記切削工具２０の軸心には、シャンク部２０ａの挿入側端面から刃部２０ｂに達する切削液供給通路２０ｃが形成され、さらに、刃部２０ｂの内部には、切削液供給通路２０ｃと連通して刃部２０ｂの先端に開口する複数の切削液噴出口２０ｄが形成されている。
【００１８】
図１において、２１はホルダ本体１１のテーパシャンク部１２を主軸８のテーパ孔８ａ内に嵌合状態に引き込むためのプルスタッドである。
このプルスタッド２１は、図１及び図２に示すように、軸心に全長に亘り形成された流体通路２１ａを有する所定長さの中空の筒状を呈するスタッド本体２１Ａを有し、このスタッド本体２１Ａの一端部外周には、前記ホルダ本体１１の雌ネジ部１１ｂと螺合する雄ネジ部２１ｂが形成されており、そして、スタッド本体２１Ａの長手方向の中間箇所には、スタッド本体２１Ａの雌ネジ部１１ｂへの螺合操作用の鍔部２１ｃが形成され、さらに、スタッド本体２１Ａの他端には、工作機械の主軸８内に配設されたプルスタッド引き込み用コレット９と係脱される係合頭部２１ｄが形成されている。また、雄ネジ部２１ｂと鍔部２１ｃとの間に位置するプルスタッド２１の外周箇所には、ホルダ本体１１の孔部１１ａとの液密性を保持するＯリング２１ｆが設けられている。
【００１９】
前記スタッド本体２１Ａの流体通路２１ａの出口側箇所には、工作機械の主軸８の軸心部に配置された切削液供給用アダプタ７からプルスタッド２１の流体通路２１ａを通してホルダ本体１１の孔部に１１ａに流入される切削液の流量を切削工具２０の種類及び被加工物の加工形態に応じて調整する流量調整部材２２が設けられている。
【００２０】
前記流量調整部材２２は、軸心に流量設定用の貫通孔２２ａを有するネジ部材２２ｂから構成され、このネジ部材２２ｂは流体通路２１ａの出口側箇所に同心に形成した雌ネジ穴２１ｅに着脱、かつ交換可能に螺着されている。
前記ネジ部材２２ｂの流量設定用貫通孔２２ａの径は、切削工具２０の種類及び被加工物の加工形態に適合する値、例えば０．８ｍｍのように設定される。また、ネジ部材２２ｂの一端には、ネジ部材２２ｂを螺合操作するための六角棒スパナのような工具が係合される係合部２２ｃが形成されている。
【００２１】
このように構成された本実施の形態に示す工具ホルダ１０において、流量調整部材２２が装着されたプルスタッド２１をホルダ本体１１のテーパシャンク部１２の後端に結合する場合は、スタッド本体２１Ａの雄ネジ部２１ｂをホルダ本体１１の孔部１１ａ内にテーパシャンク部１２側から挿入して、この雄ネジ部２１ｂをホルダ本体１１の雌ネジ部１１ｂに螺合し、鍔部２１ｃにモンキーレンチ等の工具を係合して締め付けることにより行う。
【００２２】
また、切削工具２０を工具ホルダ１０に掴持する場合は、切削工具２０のシャンク部２０ａをチャック筒１４の円筒穴内に挿入する。この状態で、締付筒１８を時計回り方向に回転すると、締付筒１８のテーパ付き円筒面と当接する各ニードルローラ１７は自身の軸線に直角な方向に自転しながらチャック筒１４の外周面を螺旋状に公転転動するため、ローラ保持筒１５はチャック筒１４の先端側からフランジ３２の方向へニードルローラ３４の公転に伴い回転しつつ移動し、同時に締付筒１８もフランジ３２の方向へ移動する。これにより、締付筒１８のテーパ付き円筒面とチャック筒１４の外周テーパ面間の間隔が減少するため、締付筒１８は各ニードルローラ１７を介してチャック筒１４を外周から内周方向へ全周面から強圧し縮径させることになる。その結果、チャック筒１４の円筒穴内に挿入された切削工具２０のシャンク部２０ａは締め付けられ、掴持される。
【００２３】
また、切削工具２０を掴持した工具ホルダ１０を工作機械の主軸８に装着する場合は、ホルダ本体１１のテーパシャンク部１２を主軸８のテーパ孔８ａ内に工具交換装置などを利用して差し込む。その後、プルスタッド引き込み用コレット９を動作させて、スタッド本体２１Ａの係合頭部２１ｄを把持する。この状態で、プルスタッド引き込み用コレット９を後方へ作動させることにより、プルスタッド２１を含む工具ホルダ１０全体を引き込む。これにより、工具ホルダ１０は工作機械の主軸８に装着される。このとき、スタッド本体２１Ａの係合頭部２１ｄ側の流体通路２１ａに切削液供給用アダプタ７が係合される。
【００２４】
次に、本実施の形態における工具ホルダに掴持された切削工具２０への切削液供給動作について説明する。
図１に示すように、図示しない工作機械側の切削液源から供給される切削液は切削液供給用アダプタ７を通してプルスタッド２１の流体通路２１ａに流入し、さらに、流量調整部材２２により切削工具２０の種類及び被加工物の加工形態に適合した流量に調整されて、ホルダ本体１１の孔部に１１ａに流入する。この流量調整された切削液は、さらに切削工具２０の切削液供給通路２０ｃ及び各切削液噴出口２０ｄを通して切削工具２０の先端から噴出される。
【００２５】
このような本実施の形態によれば、プルスタッド２１の流体通路２１ａの出口側箇所に、流量設定用の貫通孔２２ａを有するネジ部材２２ｂから構成される流量調整部材２２を設けてなるものであるため、この流量調整部材２２により工作機械側から切削液供給用アダプタ７を通して工具ホルダ１０に流入される切削液の流量を切削工具２０の種類及び被加工物の加工形態に応じて工具ホルダ１０毎に簡単に、かつ低コストで調整することができる。これにより、従来のような工作機械側での流量調整手段による切削液の流量調整が不要になり、工作機械側の切削液源を含む切削液供給回路の規模も小型化されるほか、切削工具２０の種類及び加工形態に応じた切削液の流量及び切削箇所に噴出される切削液の圧力を流量調整部材２２のみで正確に設定することができる。
【００２６】
したがって、例えば、エンドミル加工やドリル加工のように切削液の流量を大きく設定する場合でも、このエンドミル加工やドリル加工に適合する切削液の流量設定を工具ホルダ毎に設定することができ、被加工物の切削加工性に支障を来たすことがない。また、仕上げボーリング加工のように切削液の流量を小さく設定する場合でも、この仕上げボーリング加工に適合する切削液の流量設定を工具ホルダ毎に設定することができ、仕上げの穴形状（真円度、面粗度）を悪化させることがない。
【００２７】
また、この実施の形態によれば、流量調整部材２２を構成するネジ部材２２ｂの一端に六角棒スパナのような工具が係合される係合部２２ｃが形成されているため、この係合部２２ｃに工具を係合してネジ部材２２ｂを回すことにより、流量調整部材２２を容易に交換することができ、この流量調整部材２２を流量設定用貫通孔２２ａの異なる他の流量調整部材２２と交換することにより、単体の工具ホルダ１０を切削液流量の異なる複数の工具ホルダとして使用することができる。
【００２８】
次に、図３により本発明にかかるプルスタッド２１の他の実施の形態について説明する。
この図３において、図１と同一の構成要素には同一符号を付してその構成説明を省略し、図１と異なる部分を重点に述べる。
この実施の形態において、図１と異なる点は流量調整部材２３にある。この流量調整部材２３は、図３からも明らかなように、スタッド本体２１Ａの一端部に流体通路２１ａと同心に形成した流体通路２１ａより大きい径の雌ネジ穴２１ｅに着脱可能に螺合されるネジ部材２３ａから構成され、このネジ部材２３ａの雌ネジ穴２１ｅへの螺入側先端には、雌ネジ穴２１ｅに連通する流体通路２１ａの開口部２１ｇの開口面積を調節して流量を調整する円錐部２３ｂが形成され、さらに、ネジ部材２３ａには前記開口部２１ｇから雌ネジ穴２１ｅ内に流入された切削液をスタッド本体外２１Ａへ流出させる流通路２３ｃが円錐部２３ｂからネジ部材２３ａの外方側他端に向けて形成されている。
また、ネジ部材２３ａの他端には、ネジ部材２３ａを螺合操作するための六角棒スパナのような工具が係合される係合部２３ｄが形成されている。
【００２９】
このような実施の形態におけるプルスタッド２１においては、ネジ部材２３ａの係合部２３ｄに六角棒スパナのような工具を係合して回転操作することにより、ネジ部材２３ａを図３の矢印Ａ方向に移動すれば、ネジ部材２３ａの円錐部２３ｂが開口部２１ｇの開口面積を調節する。これにより、この開口面積の調節された開口部２１ｇを通して流量調整部材２３の下流側へ流出される切削液の流量を切削工具２０の種類及び被加工物の加工形態に適合した流量に調整することができる。
【００３０】
したがって、この他の実施の形態によれば、ネジ部材２３ａを図３の矢印Ａ方向に移動するだけで、切削液の流量を切削工具２０の種類及び被加工物の加工形態に適合した流量に調整することができるため、単一の流量調整部材２３を各種の切削工具及び被加工物への切削液供給の流量調整に兼用することができ、より低コスト化できる。しかも、図１に示す実施の形態と同様に、従来のような工作機械側での流量調整手段による切削液の流量調整が不要になり、工作機械側の切削液源を含む切削液供給回路の規模も小型化されるほか、切削工具２０の種類及び加工形態に応じた切削液の流量及び切削箇所に噴出される切削液の圧力を流量調整部材２３のみで正確に設定することができる。
【００３１】
次に、図４及び図５により本発明にかかるプルスタッドの変形例について説明する。
この図４及び図５に示すプルスタッド２１は、スタッド本体２１Ａの雌ネジ穴２１ｅに螺合されたネジ部材２３ａの螺合位置が切削液の流れや圧力によってみだりに変動しないようにしたものである。
このために本実施の形態では、図４及び図５に示すように、流量調整部材２３を構成するネジ部材２３ａに、ネジ部材２３ａの係合部２３ｄ側である他端からネジ部材２３ａの軸線方向に延在するスリット２３ｅをネジ部材２３ａの円周方向に複数形成し、このスリット２３ｅで区切られた分割片２３ｆを図５の矢印に示す外方へ僅かに拡開された弾性変形可能な状態に構成する。これにより、ネジ部材２３ａの雌ネジ穴２１ｅへの螺合位置を安定に保持する保持機構を構成している。
【００３２】
このような実施の形態においては、ネジ部材２３ａが雌ネジ穴２１ｅに螺合された時、外方へ拡開された弾性変形可能な分割片２３ｆの雄ネジ部が雌ネジ穴２１ｅに密着された状態に螺合される。このため、雌ネジ穴２１ｅに螺合されたネジ部材２３ａの螺合位置が切削液の流れや圧力によってみだりに変動するようなことがなくなり、ネジ部材２３ａの螺合位置を安定に保持できるとともに、安定した流用設定が可能になる。
【００３３】
なお、上記実施の形態に示す工具ホルダ１０では、流量調整部材２２または２３で流量設定された切削液を切削工具２０の切削液供給通路２０ｃ及び各切削液噴出口２０ｄを通して切削工具２０の先端から噴出させる場合について説明したが、本発明はこれに限定されない。例えば、図１に示すチャック筒１４の内壁に、チャック筒１４の軸線方向に延在してチャック筒１４の端面に開口する複数の溝を形成し、この溝のチャック筒１４の端面側開口から切削工具２０の刃部先端方向に噴出するように構成される方式のものでもよい。
【００３４】
また、上記実施の形態に示す工具ホルダ１０では、切削工具２０のシャンク部２０ａをチャック筒１４内に直接挿入してチャックングする場合について説明したが、本発明はこれに限らず、コレットを介して切削工具２０のシャンク部２０ａを掴持するようにしてもよい。
また、上記実施の形態に示す工具ホルダ１０では、チャック筒１４の外周にニードルローラ１７を介して締付筒１８を嵌合したローラロック式のチャックについて説明したが、本発明はこれに限らず、チャック筒１４の外周面と締付筒１８の内周面に半円状の溝を螺旋状に形成し、この両螺旋溝に多数の鋼球を介在したボールネジ式等のチャックを有する工具ホルダまたはコレットチャック方式のチャック機構を有する工具ホルダにも適用できるほか、ボーリングバーや正面フライスアーバ等にも適用できる。
また、本発明における保持機構は、上記図４及び図５に示す構造のものに限定されず、例えば、雌ネジ穴２１ｅにＯリングを設け、このＯリングにより、雌ネジ穴２１ｅに螺合されたネジ部材２３ａの安易な回転を防止するようにしてもよい。
【００３５】
【発明の効果】
以上説明したように本発明のプルスタッド及びこれを用いた工具ホルダによれば、スタッド本体の流体通路に流量設定用の貫通孔を有する流量調整部材を設け、この流量調整部材により工作機械側からホルダ本体内に流入される切削液の流量を切削工具の種類及び被加工物の加工形態に応じて工具ホルダ毎に設定する構成にしたので、切削液の流量を簡単に、かつ低コストで調整することができる。これにより、従来のような工作機械側での流量調整手段による切削液の流量調整が不要になり、工作機械側の切削液源を含む切削液供給回路の規模を小型化できるほか、切削工具の種類及び加工形態に応じた切削液の流量及び切削箇所に噴出される切削液の圧力を流量調整部材のみで正確に設定することができる。
【００３６】
また、本発明のプルスタッド及びこれを用いた工具ホルダによれば、流量調整部材を構成するネジ部材の一端に工具が係合される係合部を形成し、この係合部に工具を係合してネジ部材を回すことにより、流量調整部材を容易に交換することができ、この流量調整部材を流量設定用貫通孔の異なる他の流量調整部材と交換することにより、単体の工具ホルダを切削液流量の異なる複数の工具ホルダとして使用することができる。
【００３７】
また、本発明のプルスタッド及びこれを用いた工具ホルダによれば、流量調整部材を流体通路より大きい径の雌ネジ穴に着脱可能に螺合されるネジ部材から構成し、このネジ部材の雌ネジ穴への螺入側先端には雌ネジ穴に連通する流体通路の開口部の開口面積を調節して流量を調整する円錐部を設け、さらに、ネジ部材には開口部から雌ネジ穴内に流入された切削液をスタッド本体外へ流出させる流通路を設ける構成にしたので、単一の流量調整部材を各種の切削工具及び被加工物への切削液供給の流量調整に兼用することができ、より低コスト化できる。
また、本発明のプルスタッド及びこれを用いた工具ホルダによれば、ネジ部材が雌ネジ穴への螺合位置を安定に保持する保持機構を備えることにより、雌ネジ穴に螺合されたネジ部材の螺合位置が切削液の流れや圧力によってみだりに変動するようなことがなくなり、ネジ部材の螺合位置を安定に保持できるとともに安定した流用設定が可能になる。
【図面の簡単な説明】
【図１】本発明の一実施の形態における工具ホルダの縦断側面図である。
【図２】本発明の一実施の形態におけるプルスタッドの拡大断面図である。
【図３】本発明の他の実施の形態における工具ホルダの縦断側面図である。
【図４】本発明にかかるプルスタッドの変形例を示す一部の断面図である。
【図５】図４の矢印５方向から見たネジ部材の端面図である。
【符号の説明】
７切削液供給用アダプタ
８主軸
９プルスタッド引き込み用コレット
１０工具ホルダ
１１ホルダ本体
１１ａ孔部
１２テーパシャンク部
１３フランジ
１４チャック筒
１５ローラ保持筒
１７ニードルローラ
１８締付筒
２０切削工具
２０ａシャンク部
２１プルスタッド
２１Ａスタッド本体
２１ａ流体通路
２１ｂ雄ネジ部
２１ｄ係合頭部
２１ｅ雌ネジ穴
２１ｇ開口部
２２，２３流量調整部材
２２ａ流量設定用貫通孔
２２ｂネジ部材
２２ｃ係合部
２３ｂ円錐部
２３ｃ流通路
２３ｄ係合部
２３ｅスリット
２３ｆ分割片[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pull stud for inserting a tool holder holding a cutting tool into a main spindle of a machine tool, and a cutting fluid supplied through the center of the main spindle from the machine tool side using the pull stud. The present invention also relates to a tool holder that can be supplied to a cutting portion of a workpiece to be cut by the cutting tool.
[0002]
[Prior art]
In a machine tool such as a machining center, when a predetermined part of a workpiece is to be cut with a predetermined tool, for example, a cutting tool such as a drill or an end mill, a tool holder that holds these cutting tools is mounted on the spindle of the machine tool. The coolant hole or coolant supplied from the machine tool side through the center of the spindle is supplied to the tool holder supply hole and the collet slot, or to the center of the cutting tool in the axial direction. Is supplied to the cutting edge of the cutting tool and the cutting position of the workpiece, thereby improving the machinability of the workpiece.
[0003]
By the way, it is necessary to change the supply amount of the cutting fluid to the cutting edge of the cutting tool and the cutting position of the workpiece depending on the cutting mode of the workpiece. For example, in the case of end milling, drilling or rough boring, the flow rate and pressure of the cutting fluid protruding from the cutting edge of the cutting tool are set to be relatively large, and in the case of finishing boring or tapping, The flow rate and pressure of the cutting fluid protruding from the cutting edge of the cutting tool are set to be relatively small. And the flow volume adjustment of these cutting fluids was comprised by operating the flow volume adjustment means provided in the cutting fluid supply apparatus by the side of a machine tool.
[0004]
[Problems to be solved by the invention]
However, in the conventional method as described above, since the flow rate of the cutting fluid is adjusted by operating the flow rate adjusting means provided in the cutting fluid supply device on the machine tool side, the tool holder is attached to the spindle of the machine tool. It is necessary to readjust the flow rate of the cutting fluid by the flow rate adjusting means each time depending on the type and processing form of the cutting tool to be mounted via, and the adjustment operation becomes complicated and the scale of the flow rate adjusting means is also large. There is a problem of increasing the size and cost.
In addition, since the cutting fluid flow rate setting according to the type of cutting tool and the machining mode is mainly performed manually, if the flow rate setting is not appropriate, for example, the cutting fluid flow rate, such as end milling or drilling. If the cutting fluid flow rate setting is insufficient when a large value must be set, the workability of the workpiece may be hindered, and the cutting fluid flow rate may be set small as in finish boring. When the flow rate of the cutting fluid is set excessively when it has to be, there is a problem that the finished hole shape (roundness, surface roughness) deteriorates.
[0005]
The present invention has been made in order to solve the above-described conventional problems, and is a pull that can easily and inexpensively set the cutting fluid flow rate according to the type and processing form of the cutting tool. An object is to provide a stud and a tool holder using the pull stud.
[0006]
[Means for solving the problems]
In order to achieve the above object, a first aspect of the present invention is a pull stud for inserting a tool holder holding a cutting tool into a main spindle of a machine tool, the cutting fluid being supplied through the main spindle of the machine tool. A fluid passage for introducing a fluid into the tool holder is provided over the entire length of the stud body, and the fluid passage has a flow rate of the cutting fluid passing through the fluid passage according to the type of the cutting tool and the processing form of the workpiece. A flow rate adjusting member that adjusts accordingly is provided. The flow rate adjusting member is constituted by a screw member having a flow rate setting through-hole in the shaft center, and the screw member is threadably replaceable with a female screw hole provided in the stud body so as to communicate with the fluid passage. An engagement portion is formed at one end of the screw member and engaged with a tool for screwing the screw member. It is characterized by that.
[0007]
Claim 2 The pull stud according to claim 1 is characterized in that the diameter of the flow rate setting through hole is set so as to be adapted to the type of the cutting tool and the processing form of the workpiece.
[0008]
Claim 3 The invention of claim 1 In the pull stud described above, the flow rate adjusting member includes a screw member that is detachably screwed into a female screw hole having a larger diameter than the fluid passage formed concentrically with the fluid passage at one end of the stud body. The screw member has a conical portion for adjusting a flow rate by adjusting an opening area of the opening portion of the fluid passage communicating with the female screw hole at a distal end of the screw member into the female screw hole. The member is formed with a flow passage through which the cutting fluid flowing into the female screw hole from the opening flows out of the stud body.
Claim 4 The invention of claim 1 The pull stud described above is characterized in that the screw member includes a holding mechanism that stably holds the screwing position into the female screw hole.
[0009]
Claim 5 According to the present invention, there is provided a holder main body having a shank portion inserted into a spindle of a machine tool at one end and a tool attaching portion at the other end, and the tool attaching portion from the rear end of the shank portion in the holder main body. A tool holder comprising a hole formed so as to penetrate through and a pull stud coupled to a rear end of the shank, wherein the pull stud is supplied with cutting fluid supplied through a spindle of the machine tool. A stud body having a fluid passage formed over the entire length so as to be introduced into the tool holder is provided, and the fluid passage has a flow rate of the cutting fluid passing through the fluid passage, the type of the cutting tool and the processing of the workpiece. A flow rate adjusting member that adjusts according to the form is provided, The flow rate adjusting member is constituted by a screw member having a flow rate setting through-hole in an axial center, and the screw member is screwed in a replaceable manner to a female screw hole provided in the stud body so as to communicate with the fluid passage. In addition, an engaging portion is formed at one end of the screw member to engage a tool for screwing the screw member. It is characterized by that.
Claim 6 The invention of claim 5 In the described tool holder, the diameter of the flow rate setting through hole is set so as to match the type of the cutting tool and the processing form of the workpiece.
[0010]
Claim 7 The tool holder according to claim 5, wherein the flow rate adjusting member is detachably screwed into a female screw hole having a diameter larger than the fluid passage formed concentrically with the fluid passage at one end of the stud body. A conical portion that adjusts the flow rate by adjusting the opening area of the opening of the fluid passage communicating with the female screw hole at the screw-side end of the screw member into the female screw hole. Further, the screw member is formed with a flow passage through which the cutting fluid flowing into the female screw hole from the opening flows out of the stud body.
[0011]
Claim 8 The invention of claim 5 In the described tool holder, the screw member includes a holding mechanism that stably holds a screwing position into the female screw hole.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a pull stud according to the present invention and a tool holder using the pull stud will be described below with reference to the drawings.
FIG. 1 is a longitudinal side view showing an embodiment of a tool holder using a pull stud according to the present invention, and FIG. 2 is an enlarged sectional view of the pull stud in this embodiment.
[0013]
In FIG. 1, a tool holder 10 shown in this embodiment has a holder main body 11, and this holder main body 11 is a tapered shank portion that is removably fitted in a tapered hole 8a provided in a main shaft 8 of a machine tool. 12, a gripping flange 13 formed at the large-diameter side end portion of the tapered shank portion 12, and the tapered shank portion in a direction opposite to the tapered shank portion 12 from the end surface on the side opposite to the tapered shank portion of the flange 13 The cylindrical chuck cylinder 14 has a cylindrical surface 14a extending along the axis 12 and having a tapered surface 14a having a diameter that decreases from the flange 13 toward the tip.
Further, a hole 11 a that penetrates from the rear end of the taper shank portion 12 into the chuck cylinder 14 is formed in the axial center portion of the holder main body 11. An internal thread portion 11b is formed at an inner peripheral portion near the rear end of the hole portion 11a. The chuck cylinder 14 constitutes the tool attachment portion described in the claims.
In addition, a ring-shaped groove 13b that extends the effective length of the chuck cylinder 14 is formed on the end surface 13a of the flange 13 to which the chuck cylinder 14 is connected in order to facilitate elastic deformation of the chuck cylinder 14 in the radial direction. Yes.
[0014]
In FIG. 1, reference numeral 15 denotes a roller holding cylinder that is loosely fitted on the outer periphery of the chuck cylinder 14, and the diameter of the roller holding cylinder 15 increases toward the tip at a taper angle substantially similar to the taper surface 14 a of the chuck cylinder 14. It is formed from a smaller cylinder. The roller holding cylinder 15 is held so as not to fall out of the chuck cylinder 14 by a retaining ring 16 provided on the outer periphery of the tip end portion of the chuck cylinder 14.
[0015]
The roller holding cylinder 15 is provided with a large number of needle rollers 17 fitted in the circumferential direction at a predetermined angle with respect to the axis of the roller holding cylinder 15 in the circumferential direction. Each needle roller 17 is formed to have a diameter larger than the wall thickness of the roller holding cylinder 15, whereby each needle roller 17 protruding toward the inner peripheral surface side of the roller holding cylinder 15 contacts the tapered surface 14 a of the chuck cylinder 14. Each needle roller 17 that is in contact with and protrudes toward the outer peripheral surface side of the roller holding cylinder 15 is configured to abut on an inner peripheral surface of a tightening cylinder 18 described later.
[0016]
The clamping cylinder 18 tightly grips the shank portion 20a of the cutting tool 20 inserted into the chuck cylinder 14 by reducing the diameter of the chuck cylinder 14, and a roller holding cylinder is provided on the outer periphery of the chuck cylinder 14. 15 is fitted through a needle roller 17 held at 15. In addition, the inner peripheral surface of the fastening cylinder 18 is configured as a tapered cylindrical surface whose diameter decreases from the end facing the flange 13 toward the tip. Further, a retaining ring 19 also serving as a seal is attached to the inner periphery of the base end portion of the tightening cylinder 18 on the flange 13 side. The retaining ring 19 also serving as a seal is in contact with the outer peripheral surface of the chuck cylinder 14. Thus, a sealing function is exhibited, and contact with the end surface of the roller holding cylinder 15 prevents the fastening cylinder 18 from coming off from the chuck cylinder 14. The roller holding cylinder 15, the needle roller 17 and the clamping cylinder 18 constitute a chuck mechanism described in the claims.
[0017]
A cutting fluid supply passage 20c is formed in the axial center of the cutting tool 20 from the insertion side end face of the shank portion 20a to the blade portion 20b. Further, the cutting portion 20b is communicated with the cutting fluid supply passage 20c. A plurality of cutting fluid outlets 20d are formed at the tip of the cutting edge 20b.
[0018]
In FIG. 1, reference numeral 21 denotes a pull stud for drawing the tapered shank portion 12 of the holder body 11 into the tapered hole 8 a of the main shaft 8 in a fitted state.
As shown in FIGS. 1 and 2, the pull stud 21 includes a stud main body 21A having a hollow cylindrical shape with a predetermined length having a fluid passage 21a formed over the entire length of the shaft center. A male screw portion 21b that is screwed with the female screw portion 11b of the holder main body 11 is formed on the outer periphery of one end portion of the holder main body 11A. A flange portion 21c for screwing operation to the screw portion 11b is formed, and further, the other end of the stud main body 21A is engaged with or disengaged from a pull stud pull-in collet 9 disposed in the main shaft 8 of the machine tool. An engaging head 21d is formed. Further, an O-ring 21f that maintains liquid tightness with the hole 11a of the holder body 11 is provided at the outer peripheral portion of the pull stud 21 that is located between the male screw portion 21b and the flange portion 21c.
[0019]
At the outlet side portion of the fluid passage 21a of the stud main body 21A, the cutting fluid supply adapter 7 disposed in the axial center portion of the spindle 8 of the machine tool passes through the fluid passage 21a of the pull stud 21 to the hole of the holder main body 11. A flow rate adjusting member 22 is provided for adjusting the flow rate of the cutting fluid flowing into 11a according to the type of the cutting tool 20 and the processing form of the workpiece.
[0020]
The flow rate adjusting member 22 includes a screw member 22b having a through hole 22a for setting a flow rate at an axial center. The screw member 22b is attached to and detached from a female screw hole 21e formed concentrically at an outlet side portion of the fluid passage 21a. And it is screwed so that it can be replaced.
The diameter of the flow rate setting through hole 22a of the screw member 22b is set to a value suitable for the type of the cutting tool 20 and the processing form of the workpiece, for example, 0.8 mm. Further, an engaging portion 22c is formed at one end of the screw member 22b to be engaged with a tool such as a hexagonal bar spanner for screwing the screw member 22b.
[0021]
In the tool holder 10 shown in this embodiment configured as described above, when the pull stud 21 to which the flow rate adjusting member 22 is attached is coupled to the rear end of the taper shank portion 12 of the holder body 11, the stud body 21A The male screw portion 21b is inserted into the hole portion 11a of the holder main body 11 from the tapered shank portion 12 side, the male screw portion 21b is screwed into the female screw portion 11b of the holder main body 11, and a monkey wrench or the like is attached to the flange portion 21c. This is done by engaging and tightening the tool.
[0022]
Further, when the cutting tool 20 is gripped by the tool holder 10, the shank portion 20 a of the cutting tool 20 is inserted into the cylindrical hole of the chuck cylinder 14. In this state, when the clamping cylinder 18 is rotated in the clockwise direction, each needle roller 17 in contact with the tapered cylindrical surface of the clamping cylinder 18 rotates in the direction perpendicular to its own axis while rotating on the outer circumferential surface of the chuck cylinder 14. The roller holding cylinder 15 moves while rotating with the revolution of the needle roller 34 from the front end side of the chuck cylinder 14 toward the flange 32, and at the same time, the clamping cylinder 18 also moves in the direction of the flange 32. Move to. As a result, the distance between the tapered cylindrical surface of the clamping cylinder 18 and the outer circumferential tapered surface of the chuck cylinder 14 is reduced, so that the clamping cylinder 18 moves the chuck cylinder 14 from the outer circumference to the inner circumference via the needle rollers 17. The pressure is reduced from the entire circumference to reduce the diameter. As a result, the shank portion 20a of the cutting tool 20 inserted into the cylindrical hole of the chuck cylinder 14 is tightened and gripped.
[0023]
When the tool holder 10 holding the cutting tool 20 is mounted on the spindle 8 of the machine tool, the tapered shank portion 12 of the holder body 11 is inserted into the tapered hole 8a of the spindle 8 using a tool changer or the like. . Thereafter, the pull stud retracting collet 9 is operated to grip the engaging head 21d of the stud main body 21A. In this state, the entire tool holder 10 including the pull stud 21 is retracted by operating the pull stud retracting collet 9 backward. Thereby, the tool holder 10 is mounted on the spindle 8 of the machine tool. At this time, the cutting fluid supply adapter 7 is engaged with the fluid passage 21a on the engaging head 21d side of the stud main body 21A.
[0024]
Next, the cutting fluid supply operation to the cutting tool 20 held by the tool holder in the present embodiment will be described.
As shown in FIG. 1, the cutting fluid supplied from a cutting fluid source (not shown) on the machine tool side flows into the fluid passage 21 a of the pull stud 21 through the cutting fluid supply adapter 7, and is further cut by the flow rate adjusting member 22. The flow rate is adjusted to 20 types and the processing form of the workpiece, and flows into the hole 11a of the holder main body 11. The cutting fluid whose flow rate has been adjusted is further ejected from the tip of the cutting tool 20 through the cutting fluid supply passage 20c of the cutting tool 20 and the respective cutting fluid ejection ports 20d.
[0025]
According to the present embodiment, the flow rate adjusting member 22 including the screw member 22b having the through hole 22a for flow rate setting is provided at the outlet side portion of the fluid passage 21a of the pull stud 21. Therefore, the flow rate of the cutting fluid flowing into the tool holder 10 from the machine tool side through the cutting fluid supply adapter 7 by the flow rate adjusting member 22 is changed according to the type of the cutting tool 20 and the processing form of the workpiece. Each adjustment can be made easily and at low cost. This eliminates the need to adjust the flow rate of the cutting fluid by the flow rate adjusting means on the machine tool side as in the prior art, and also reduces the size of the cutting fluid supply circuit including the cutting fluid source on the machine tool side. The flow rate of the cutting fluid and the pressure of the cutting fluid ejected to the cutting location according to the 20 types and machining forms can be accurately set only by the flow rate adjusting member 22.
[0026]
Therefore, for example, even when the flow rate of the cutting fluid is set to be large as in end milling or drilling, the flow rate setting of the cutting fluid suitable for this end milling or drilling can be set for each tool holder. There is no hindrance to the machinability of objects. Even when the cutting fluid flow rate is set to a low value, such as in finishing boring, the cutting fluid flow rate setting suitable for finishing boring processing can be set for each tool holder, and the finished hole shape (roundness) , Surface roughness) is not deteriorated.
[0027]
Moreover, according to this embodiment, since the engaging part 22c with which a tool like a hexagon stick spanner is engaged is formed at one end of the screw member 22b constituting the flow rate adjusting member 22, this engaging part By engaging the tool with 22c and turning the screw member 22b, the flow rate adjusting member 22 can be easily replaced. This flow rate adjusting member 22 is different from other flow rate adjusting members 22 having different flow rate setting through holes 22a. By exchanging, the single tool holder 10 can be used as a plurality of tool holders having different cutting fluid flow rates.
[0028]
Next, another embodiment of the pull stud 21 according to the present invention will be described with reference to FIG.
In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals, description of the components is omitted, and portions different from those in FIG.
In this embodiment, a difference from FIG. As apparent from FIG. 3, the flow rate adjusting member 23 is detachably screwed into a female screw hole 21e having a larger diameter than the fluid passage 21a formed concentrically with the fluid passage 21a at one end portion of the stud body 21A. The screw member 23a is configured to adjust the flow rate by adjusting the opening area of the opening 21g of the fluid passage 21a communicating with the female screw hole 21e at the screw-side end of the screw member 23a into the female screw hole 21e. A conical portion 23b is formed, and a flow passage 23c is provided in the screw member 23a to allow the cutting fluid flowing into the female screw hole 21e from the opening 21g to flow out of the stud main body 21A to the screw member 23a. It is formed toward the outer side other end.
In addition, an engaging portion 23d is formed at the other end of the screw member 23a to be engaged with a tool such as a hexagonal bar spanner for screwing the screw member 23a.
[0029]
In the pull stud 21 in such an embodiment, the screw member 23a is rotated in the direction of arrow A in FIG. 3 by engaging and rotating a tool such as a hexagonal bar wrench to the engaging portion 23d of the screw member 23a. The conical part 23b of the screw member 23a adjusts the opening area of the opening 21g. Thereby, the flow rate of the cutting fluid flowing out to the downstream side of the flow rate adjusting member 23 through the opening portion 21g having the adjusted opening area is adjusted to a flow rate suitable for the type of the cutting tool 20 and the processing form of the workpiece. Can do.
[0030]
Therefore, according to this other embodiment, only by moving the screw member 23a in the direction of the arrow A in FIG. 3, the flow rate of the cutting fluid is adjusted to the flow rate suitable for the type of the cutting tool 20 and the processing form of the workpiece. Since it can be adjusted, the single flow rate adjusting member 23 can be used for adjusting the flow rate of the cutting fluid supply to various cutting tools and workpieces, and the cost can be further reduced. In addition, as in the embodiment shown in FIG. 1, it is not necessary to adjust the flow rate of the cutting fluid by the flow rate adjusting means on the machine tool side as in the prior art, and the cutting fluid supply circuit including the cutting fluid source on the machine tool side is eliminated. In addition to reducing the scale, the flow rate of the cutting fluid and the pressure of the cutting fluid ejected to the cutting location according to the type and machining form of the cutting tool 20 can be set accurately only by the flow rate adjusting member 23.
[0031]
Next, a modification of the pull stud according to the present invention will be described with reference to FIGS.
The pull stud 21 shown in FIGS. 4 and 5 is configured so that the screwing position of the screw member 23a screwed into the female screw hole 21e of the stud main body 21A does not fluctuate due to the flow or pressure of the cutting fluid. .
Therefore, in the present embodiment, as shown in FIGS. 4 and 5, the screw member 23a constituting the flow rate adjusting member 23 is connected to the axis of the screw member 23a from the other end on the engaging portion 23d side of the screw member 23a. A plurality of slits 23e extending in the circumferential direction are formed in the circumferential direction of the screw member 23a, and the divided pieces 23f partitioned by the slits 23e are elastically deformable slightly expanded outward as indicated by arrows in FIG. Configure to state. Thereby, the holding mechanism which hold | maintains stably the screwing position to the female screw hole 21e of the screw member 23a is comprised.
[0032]
In such an embodiment, when the screw member 23a is screwed into the female screw hole 21e, the male screw portion of the elastically deformable split piece 23f expanded outward is brought into close contact with the female screw hole 21e. It is screwed together. For this reason, the screwing position of the screw member 23a screwed into the female screw hole 21e does not change suddenly due to the flow or pressure of the cutting fluid, and the screwing position of the screw member 23a can be stably held. Stable diversion settings are possible.
[0033]
In the tool holder 10 shown in the above embodiment, the cutting fluid whose flow rate is set by the flow rate adjusting member 22 or 23 passes from the tip of the cutting tool 20 through the cutting fluid supply passage 20c of the cutting tool 20 and each cutting fluid outlet 20d. Although the case of ejecting has been described, the present invention is not limited to this. For example, a plurality of grooves extending in the axial direction of the chuck cylinder 14 and opening at the end surface of the chuck cylinder 14 are formed on the inner wall of the chuck cylinder 14 shown in FIG. The thing of the system comprised so that it may eject to the blade part front-end | tip direction of the cutting tool 20 may be used.
[0034]
Moreover, in the tool holder 10 shown in the said embodiment, although the case where the shank part 20a of the cutting tool 20 was directly inserted in the chuck | zipper cylinder 14 and chucked was demonstrated, this invention is not limited to this, A collet is used. Thus, the shank portion 20a of the cutting tool 20 may be gripped.
Further, in the tool holder 10 shown in the above embodiment, the roller lock type chuck in which the fastening cylinder 18 is fitted to the outer periphery of the chuck cylinder 14 via the needle roller 17 has been described, but the present invention is not limited thereto. In addition, a tool holder having a ball screw type chuck in which a semicircular groove is formed in a spiral shape on the outer peripheral surface of the chuck cylinder 14 and the inner peripheral surface of the clamping cylinder 18 and a number of steel balls are interposed in both the spiral grooves. Alternatively, it can be applied to a tool holder having a collet chuck type chuck mechanism, and can also be applied to a boring bar, a face milling arbor, or the like.
Further, the holding mechanism in the present invention is not limited to the structure shown in FIGS. 4 and 5 described above. For example, an O-ring is provided in the female screw hole 21e, and the O-ring is screwed into the female screw hole 21e. Alternatively, easy rotation of the screw member 23a may be prevented.
[0035]
【The invention's effect】
As described above, according to the pull stud of the present invention and the tool holder using the pull stud, a flow rate adjusting member having a through hole for setting a flow rate is provided in the fluid passage of the stud body, and the flow rate adjusting member allows the flow control member to Since the flow rate of the cutting fluid flowing into the holder body is set for each tool holder according to the type of cutting tool and the processing form of the workpiece, the flow rate of the cutting fluid can be adjusted easily and at low cost. can do. This eliminates the need for adjusting the flow rate of the cutting fluid by the flow rate adjusting means on the machine tool side as in the prior art, reducing the size of the cutting fluid supply circuit including the cutting fluid source on the machine tool side, and reducing the size of the cutting tool. The flow rate of the cutting fluid and the pressure of the cutting fluid ejected to the cutting location according to the type and machining form can be accurately set only by the flow rate adjusting member.
[0036]
Further, according to the pull stud of the present invention and the tool holder using the pull stud, an engaging portion to which the tool is engaged is formed at one end of the screw member constituting the flow rate adjusting member, and the tool is engaged with the engaging portion. The flow adjustment member can be easily replaced by turning the screw member together, and the single tool holder can be replaced by replacing this flow adjustment member with another flow adjustment member having a different flow setting through hole. It can be used as a plurality of tool holders with different cutting fluid flow rates.
[0037]
Further, according to the pull stud of the present invention and the tool holder using the same, the flow rate adjusting member is constituted by a screw member that is detachably screwed into a female screw hole having a diameter larger than that of the fluid passage. A conical portion for adjusting the flow rate by adjusting the opening area of the fluid passage opening communicating with the female screw hole is provided at the screw-side end of the screw hole, and the screw member is provided in the female screw hole from the opening. Since the flow path for flowing the cutting fluid out of the stud body is provided, a single flow rate adjusting member can be used to adjust the flow rate of the cutting fluid supply to various cutting tools and workpieces. The cost can be further reduced.
Further, according to the pull stud of the present invention and the tool holder using the same, the screw member is provided with a holding mechanism that stably holds the screwing position into the female screw hole, so that the screw screwed into the female screw hole. The screwing position of the member does not fluctuate suddenly due to the flow or pressure of the cutting fluid, and the screwing position of the screw member can be stably held and a stable diversion setting is possible.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a tool holder according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a pull stud according to an embodiment of the present invention.
FIG. 3 is a longitudinal side view of a tool holder according to another embodiment of the present invention.
FIG. 4 is a partial cross-sectional view showing a modification of the pull stud according to the present invention.
FIG. 5 is an end view of the screw member as viewed from the direction of arrow 5 in FIG. 4;
[Explanation of symbols]
7 Cutting fluid supply adapter
8 Spindle
9 Collet for pull stud pull-in
10 Tool holder
11 Holder body
11a hole
12 Taper shank
13 Flange
14 Chuck cylinder
15 Roller holding cylinder
17 Needle roller
18 Tightening cylinder
20 Cutting tools
20a Shank
21 Pull stud
21A Stud body
21a Fluid passage
21b Male thread
21d engagement head
21e Female thread hole
21g opening
22, 23 Flow rate adjusting member
22a Through hole for flow rate setting
22b Screw member
22c engagement part
23b Conical part
23c Flow path
23d engagement part
23e slit
23f Divided pieces

Claims

A pull stud for inserting a tool holder holding a cutting tool into a spindle of a machine tool,
A fluid passage for introducing a cutting fluid supplied through the main spindle of the machine tool into the tool holder is provided with a stud body formed over the entire length, and the fluid passage cuts a flow rate of the cutting fluid passing through the fluid passage. A flow rate adjusting member that adjusts according to the type of tool and the processing form of the workpiece is provided, and the flow rate adjusting member is configured by a screw member having a flow rate setting through hole in an axial center, and the screw member is The stud main body is replaceably screwed into a female screw hole provided to communicate with the fluid passage, and a tool for screwing the screw member is engaged with one end of the screw member. A pull stud characterized in that an engaging portion is formed .

2. The pull stud according to claim 1, wherein a diameter of the flow rate setting through hole is set so as to match a type of the cutting tool and a processing form of the workpiece.

The flow rate adjusting member includes a screw member that is detachably screwed into a female screw hole having a larger diameter than the fluid passage formed concentrically with the fluid passage at one end portion of the stud body, A conical portion for adjusting the flow rate by adjusting the opening area of the fluid passage opening communicating with the female screw hole is formed at the screw-side end of the female screw hole, and the screw member further includes the opening portion. The pull stud according to claim 1, wherein a flow passage is formed through which the cutting fluid flowing into the female screw hole flows out of the stud body.

The screw member is pull stud according to claim 1, further comprising a holding mechanism for stably holding the screwing position to the female screw hole.

A holder main body having a shank portion inserted into the spindle of the machine tool at one end and a tool attachment portion at the other end, and penetrating from the rear end of the shank portion to the tool attachment portion in the holder main body. A tool holder comprising: a hole formed in; and a pull stud coupled to a rear end of the shank portion,
The pull stud includes a stud body having a fluid passage formed over the entire length so that cutting fluid supplied through a main shaft of the machine tool is introduced into the tool holder, and the fluid passage includes the fluid passage. A flow rate adjusting member for adjusting the flow rate of the cutting fluid passing therethrough is provided according to the type of the cutting tool and the processing form of the workpiece, and the flow rate adjusting member is a screw member having a flow rate setting through hole in the shaft center. The screw member is replaceably screwed into a female screw hole provided in the stud main body so as to communicate with the fluid passage, and the screw member is screwed to one end of the screw member. The tool holder characterized by the above-mentioned. The engagement part with which the tool for doing is engaged is formed .

6. The tool holder according to claim 5, wherein a diameter of the flow rate setting through hole is set so as to match a type of the cutting tool and a processing form of the workpiece.

The flow rate adjusting member includes a screw member that is detachably screwed into a female screw hole having a larger diameter than the fluid passage formed concentrically with the fluid passage at one end portion of the stud body, A conical portion for adjusting the flow rate by adjusting the opening area of the fluid passage opening communicating with the female screw hole is formed at the screw-side end of the female screw hole, and the screw member further includes the opening portion. The tool holder according to claim 5, wherein a flow passage is formed through which the cutting fluid flowing into the female screw hole flows out of the stud body.

The tool holder according to claim 5, wherein the screw member includes a holding mechanism that stably holds a screwing position in the female screw hole.