JP3671392B2

JP3671392B2 - Machine tool spindle equipment

Info

Publication number: JP3671392B2
Application number: JP2001040142A
Authority: JP
Inventors: 正槇山
Original assignee: Horkos Corp
Current assignee: Horkos Corp
Priority date: 2001-02-16
Filing date: 2001-02-16
Publication date: 2005-07-13
Anticipated expiration: 2021-02-16
Also published as: TW553792B; WO2002064310A1; JP2002239869A

Description

【０００１】
【発明の属する技術分野】
本発明は、主軸の内部で切削液ミストの生成される工作機械の主軸装置に関する。
【０００２】
【従来の技術】
回転駆動される主軸の中心孔内にミスト発生部を設け、このミスト発生部の一部である非回転状態のミスト出口部材から噴出された切削液ミストがこのミスト出口部材よりも前方にある工具ホルダの中心孔を経て刃具の先端開口から流出されるようになされた主軸装置を備えた工作機械は存在している（例えば、特許第２６８７１１０号公報、特開平１１−２３５６４１号公報参照）。
【０００３】
【発明が解決しようとする課題】
上記工作機械では、ミスト出口部材前端から刃具後端に至るまでのミスト通路の径が比較的大きく変化すると共に、このミスト通路が主軸と共に回転されるため、切削油ミストが前記ミスト通路内での圧力変化、速度変化及び遠心力作用により液状化され刃具の先端開口から定常的に流出しなくなることがあり、これに起因して加工の品質低下や刃具の異常摩耗などが生じることがる。
斯かる問題点は刃具をスタブホルダの使用で取付る工作機械の主軸装置で、とりわけ問題点が大きい。本発明ではこれに対処し得るものとした工作機械の主軸装置を提供することを目的とする。
【０００４】
【課題を解決するための手段】
上記目的を達成するため、本発明では、請求項１に記載したように、刃具をスタブホルダで固定状態にする工具ホルダは、中心部にネジ部ｇの形成された中心孔内へ刃具の後端面の当接される刃具係止部材と、上記ネジ部ｇと螺合する刃具係止部材の前後位置を変更調整する雄ネジ部材とからなる刃具前後位置係止手段を備えると共に、回転駆動される主軸の内孔内には切削液通路をなす内管と圧縮空気路をなす外管の二重管を非回転状態に内挿し且つその前部にミスト発生部を設け、このミスト発生部の一部であるミスト出口部材から噴出された切削液ミストがこのミスト出口部材よりも前方にある工具ホルダの内孔を経てこのスタブホルダに固定の刃具の先端部から流出されるようになされた工作機械の主軸装置であって、前記ミスト出口部材を内包させた状態に外管の先端部を延長して工具ホルダの内孔内に位置した刃具後端部近傍まで到達させるためのミスト出口部に形成して非回転状態に配置するほか、前記ミスト発生部は筒状の切削液噴出ノズル部材を備えており、このノズル部材の後端を内管の前端部へ内装させ、一方切削液噴出ノズル部材は前後向き中心孔を有する円筒部材になすと共に、前部を先細り状の円錐雄面部となし、他方後端部の中心孔部分の径を幾分大きくなしてこの部分にコイルバネの一端を前方への移動規制状態に内挿させたものとなし、又内管の前端部の内孔で切削液噴出ノズル部材の後側となる箇所にはシート用円筒部材と、この円筒部材の前端部分に前記コイルバネで押圧される球弁体と、この球弁体の周囲を囲うように前記円筒部材に外嵌させるための切削液噴出ノズル部材とを一体化させた弁体案内筒部材とからなる切削液流出規制用弁手段を設けた構成とする。
【０００５】
上記ミスト発生部で発生した切削液ミストはミスト出口部材及びミスト出口延長部のミスト出口通路内を経て刃具後端部に達し、この後、刃具に形成されたミスト通路を経て刃具の先端部から流出する。この際、ミスト出口延長部のミスト出口通路は非回転状態であるため、このミスト出口通路内を通過している切削液ミストは主軸の回転による遠心力に起因した気液分離作用を受けないのであり、従ってミスト発生部の発生した切削液ミストはミスト出口部材から適当な霧状のまま刃具の後端部に達し、刃具内のミスト通路内を円滑に流れて刃具先端部から連続して安定的に流出するものとなる。
【０００６】
そしてミスト出口部材にミスト出口延長部を形成したことが、ミスト出口部材から刃具の後端部近傍までのミスト出口通路を簡易により非回転状態に保持させる上で寄与し、またミスト出口部材から刃具の後端部近傍までのミスト出口通路の断面積をその長さ方向位置の変化に対して急激に変化させないようになす上で寄与する。ここにおいて、ミスト出口通路の断面積がミスト出口通路の長さ方向へ向けて急激に変化しないことはミスト出口通路内の切削液ミストの圧力変化による液状化を発生させない上で寄与するものである。
【０００７】
上記発明は次のように変形できるのであって、即ち、請求項２に記載したように、前記ミスト出口部材と同体状部位に該ミスト出口部材を内包させた状態に外管の先端部を延長して工具ホルダの内孔内に位置した刃具後端部近傍まで非回転状態で到達させるものとしたミスト出口延長部を形成した構成となす。この発明においても、請求項１記載の発明の作用とほぼ同様の作用が得られるものとなるのであり、またミスト出口部材は短いものとなるほか、ミスト出口延長部の位置安定性が向上するものとなる。
【０００８】
上記した各発明は次のように具体化するのがよい。
即ち、請求項３に記載したように、工具ホルダ内で刃具後端に当接して刃具の後方変位を阻止するものとした刃具前後位置係止手段に前後向き透孔を形成し、この前後向き透孔内にミスト出口延長部の前端部を挿入する。
このようにすれば、工具ホルダ内に従来より設けられている刃具前後位置係止手段がミスト出口延長部のミスト出口通路と、刃具後端部のミスト通路とを支障なく連通させるものとなる。
【０００９】
この際、請求項４に記載したように、工具ホルダの主軸内嵌入部を直円筒状となし、この嵌入部の内方に刃具前後位置係止手段を設けると共に、この刃具前後位置係止手段の前後向き透孔内へのミスト出口延長部の挿入長さを主軸内嵌入部の長さよりも短くなすのがよい。このようにすれば、工具ホルダを主軸に対し脱着する際に、工具ホルダの主軸内嵌入部が主軸の内孔に密状に案内された状態の下で、ミスト出口延長部が刃具前後位置係止手段の前後向き孔に対し出入りするようになり、ミスト出口延長部と刃具前後位置係止手段とはこれら相互の接触を何らの注意を要することなく回避されるものとなる。
【００１０】
また請求項５に記載したように、ミスト出口部材及びミスト出口延長部の双方のミスト出口通路を直線状になすと共にその前後方向任意位置の径を略一定大きさとなす。このようにすれば、ミスト出口通路の断面積がミスト出口通路の前後長さ方向位置の変化に関連して大きく変化するものとならず、しかもミスト出口部材及びミスト出口延長部の双方のミスト出口通路が直線状であるため、ミスト出口通路内を流れる切削液ミストの圧力変動が生じ難くなって、上述したようにその液状化が抑制されるのである。
【００１１】
【発明の実施の形態】
図１は本発明の一実施例である工作機械の主軸装置を示す側面視断面図、図２は前記主軸装置の要部を示す側面視断面図、図３は前記主軸装置の変形例を示す側面視断面図、図４は前記変形例の要部を示す側面視断面図である。
【００１２】
これらの図に於いて、１は主軸装置の本体フレームであり、この本体フレーム１には主軸２が玉軸受３ａ、３ｂを介して一定位置での回転自在に内挿してある。
このさい、４は本体フレーム１の前端面にボルト固定されたリング部材、５は主軸２の後端部に外挿されキー固定された入力歯車、６は主軸２の後端部に螺着され主軸２からの入力歯車５の抜け出しを規制するためのナット体、７ａ及び７ｂは玉軸受３ａ、３ｂの前後位置を規制するための筒形スペーサである。
【００１３】
主軸２は先端中心部に直円筒雌面を有する嵌合孔２ａを有すると共にこの嵌合孔２ａに連続して径違いの３つの直状の中心孔２ｂ、２ｃ、２ｄを形成されたものとなされている。８はホルダ本体８ａを主体とした工具ホルダであり、ホルダ本体８ａの一部をなす主軸内嵌入部８ｂが主軸２の嵌入孔２ａに内嵌されている。
そして、９は本体フレーム１に回転自在に支持され入力歯車５に噛み合った伝動歯車で、図示しないモータから回転を伝達されるものである。
【００１４】
１０は主軸２後方に設けられた付加フレームであり、この付加フレーム１０の主軸２真後ろ部分には透孔１０ａが設けてあり、この透孔１０ａには供給路部材１１の円筒状嵌合部１１ａが内嵌されると共に供給路部材１１の後部が付加フレーム１０にボルト固定されている。そして、供給路部材１１の後端部には圧縮空気供給ライン１２ａを接続するための接続金具１２と、切削液供給ライン１３ａを接続するための接続金具１３が螺着されている。
【００１５】
上記主軸２の中心孔２ｄには主軸２と接触しない状態となされた直状供給管１４が直状中心孔２ｄと同心状に非回転状態で内挿してある。この直状供給管１４は内管１４ａと外管１４ｂからなる二重管となされてあって、内管１４ａの内孔を液通路ａとなし、外管１４ｂと内管１４ａの間を圧縮空気通路ｂとなしてある。
【００１６】
外管１４ｂの前部は小径部ｃ１となされ、この小径部ｃ１と中心孔２ｃとの間に小径部ｃ１を回転自在に支持するための玉軸受１５を、そして小径部ｃ１と中心孔２ｂとの間で玉軸受１５の前側にリング状シール部材ｓを設けている。また内管１４ａの後端部は接続金具１３の中心孔内に液密状に内挿され、また内管１４ａの前端部は直状供給管１４の先端部に非回転状態に固設されたミスト発生部１６の後部に液密状に結合されている。この際、玉軸受１５とリング状シール部材ｓとの間にはこれらが玉軸受１５の内輪と直接接触しないようになすための隔離用リング板ｒを設けている。
【００１７】
上記ミスト発生部１６は、液通路ａを通じて供給された切削液を、圧縮空気通路ｂを通じて供給された圧縮空気により霧状となすもので、図２を参照して詳細に説明すると次のとおりである。
即ち、筒状の切削液噴出ノズル部材１７を備えており、このノズル部材１７の後端部を内管１４ａの前端部に内嵌している。切削液噴出ノズル部材１７は前後向き中心孔１７ａを有する円筒部材となされ、前部を先細り状の円錐雄面部１７ｂとなされ、後端部の中心孔１７ａ部分の径を幾分大きくなされてこの部分にコイルバネ１８の一端を前方への移動の規制された状態に内挿されるものとなしている。
【００１８】
内管１４ａの前端部の内孔で切削液噴出ノズル部材１７の後側となる箇所にはシート用円筒部材１９と、この円筒部材１９の前端のシート部分に前記コイルバネ１８で押圧される球弁体２０と、この球弁体２０の周囲を囲うように前記円筒部１９材に外嵌させるための切削液噴出ノズル部材１７と一体化させた弁体案内筒部材２１とからなる切削液流出規制用弁手段２２が形成してある。また切削液噴出ノズル部材１７の前小径部にミスト出口部材２３を外嵌させ、このミスト出口部材２３を外管１４ｂの先端小径部にＯリングによる気密状に内嵌している。
【００１９】
このミスト出口部材２３は次のようになされるのであって、即ち、前細りのテーパ雄面部２３ａを有し、このテーパ雄面部２３ａが外管１４ｂの小径部ｃ１の内孔に形成されたテーパ雌面部ｃ２に当接して前方への移動を規制されるようになされ、且つ後側径大内孔部ｄに切削液噴出ノズル部材１７の前部分を気密状に内嵌させると共に、前側径小内孔部ｅ１をミスト出口通路となされ、このミスト出口通路ｅ１の内方中心箇所に前記円錐雄面部１７ｂの先端部を位置されると共に、外周面には前後向きで細巾の圧縮空気溝形通路ｆを形成され、この通路ｆが円錐雄面部１７ｂの外周面と後側径大内孔部ｄとで形成された空間に連通され、前記圧縮空気通路ｂ内の圧縮空気が圧縮空気溝形通路ｆ、円錐雄面部１７ｂを取り巻く後側径大内孔部ｄ内空間、そして円錐雄面部１７ｂの先端部とミスト出口通路ｅ１との間の環状隙間を経てミスト出口通路ｆ前部に連通するものとなされている。
【００２０】
上記ミスト出口部材２３には比較的小径の直状筒部材となされたミスト出口延長部２４が設けてあり、この延長部２４は外管１４ｂの先端部のテーパ雌面部ｃ２よりも前側の部分を云うもので、テーパ雌面部ｃ２の前側中心孔を通じて前方へ片持ち状に張り出させてある。そしてミスト出口延長部２４の中心部に形成されたミスト出口通路ｅ２とミスト出口部材２３のミスト出口通路ｅ１とは直線状となされており、これらミスト出口通路ｅ１、ｅ２の径は前後方向任意位置の径を略一定大きさとなされている。
【００２１】
前記工具ホルダ８はホルダ本体８ａの前部に位置された刃具２５の周面部を締結して固定状態とするためのスタブホルダ２６で主軸内嵌入部が直円筒状をなすと共に、中心部にネジ部ｇの形成された中心孔ｈを有し、この中心孔ｈ内に刃具前後位置係止手段２７を形成されている。
この刃具前後位置係止手段２７は中心孔ｈに内挿され刃具２５の後端面を当接される刃具係止部材２８と、前記中心孔ｈ内のネジ部ｇに螺入され刃具係止部材２８の前後位置を変更調整することのできる雄ネジ部材２９とを有しており、前記刃具係止部材２８及び前記雄ネジ部材２９の中心箇所には前後向き透孔ｉ１、ｉ２を形成されている。そして、この透孔ｉ１、ｉ２の内方にミスト出口延長部２４の先端部が挿入されており、この挿入長さは主軸内嵌入部８ｂの前後長さよりも短くなしてある。
この際、刃具係止部材２８の前後向き透孔ｉ１、ｉ２はミスト出口延長部２４のミスト出口通路ｅ２に出来るだけ近似した小径となしてあり、しかも先細りの円錐雌面部ｊを介して刃具２５後端に連続されると共に切削液ミストの流動距離を成る可く短くなしている。
【００２２】
コレットチャック２６は刃具２５の周面部を包囲したコレット３０と、このコレット３０を前後方向へ変位させるための操作ナット部３１からなっている。
さらに刃具２５は中心部にミスト通路ｋを直状に形成されており、このミスト通路ｋは前端部を二股状に分岐されて刃具２５の先端面の特定直径の中心を挟む各側に形成された出口開口ｍ、ｍに連通され、また後端を刃具２５の後端面の中心に形成された入口開口ｎに連通されている。なお図示例では刃具２５をツイストドリルとなしているが、これに限定するものではない。
【００２３】
次に上記のように構成した主軸装置の使用例及びその作動を説明する。
刃具２５の着脱はスタブホルダ２６の操作ナット部３１を弛緩側へ回転操作してコレット３０を前方へ変位させるのであり、これによりコレット３０の中心孔ｐが拡径状態となる。この後、刃具２５の後部をコレット３０の中心孔ｐに挿入して、刃具２５の後端を刃具係止部材２８の前面に当接させ、この当接状態を保持して操作ナット部３１を締結側へ回転操作してコレット３０を後方へ変位させる。これにより、コレット３０がそのテーパ面による楔作用によりその中心孔ｐが縮径状態となり、刃具２５はホルダ本体８ａに締結状に固定される。
【００２４】
ホルダ本体８ａに対する刃具２５の前後位置を変更する際は、主軸２と工具ホルダ８との結合を解除させて、工具ホルダ８を主軸２から取り外し、次に刃具２５の取り外された状態の下で或いは刃具２５の前後変位を可能になした状態の下で雄ネジ部材２９を適宜に回転操作する。これにより、雄ネジ部材２９がネジ送り作用により回転操作方向に関連した特定向きへ変位し、ホルダ本体８ａに対する刃具係止部材２８の位置が調製変更される。この後、工具ホルダ８における刃具２５をこれの後端面が刃具係止部材２８の前端面に当接した状態の下でホルダ本体８ａに固定させるのであり、この状態となされた工具ホルダ８を主軸２に取り付ける。
【００２５】
工具ホルダ８を主軸２に対し脱着するときは、ホルダ本体８ａの主軸内嵌入部８ｂを主軸２の嵌入孔２ａから抜き出したり主軸２の嵌入孔８ａに挿入するようになされる。このとき主軸内嵌入部８ｂが主軸２の嵌入孔２ａにより主軸２中心の正確な前後方向へ案内されるため、ミスト出口延長部２４が刃具前後位置係止手段２７の前後向き透孔ｉ１、ｉ２に接触する現象は回避されるものとなる。
【００２６】
次にワークを加工するときの状況について説明すると、主軸２は図示しないモータの回転を伝動歯車９や入力歯車５を介して伝達され、玉軸受３ａ、３ｂに支持された状態で本体フレーム１の特定位置で回転する。そして、主軸２の回転がホルダ本体８ａ、コレットチャック２６を介して刃具２５に伝達されるのであり、この際、刃具前後位置係止手段２７もホルダ本体８ａと同体状に回転される。
【００２７】
一方、直状供給管１４は前端部を玉軸受１５で支持され後端部を付加フレーム１０と同体状に支持されているため、主軸２の回転中にも非回転状態に保持されるのであり、従って直状供給管１４と同体状に設けられたミスト発生部１６も非回転状態に保持される。この際、リング状シール部材ｓは回転状態の主軸２の中心孔２ｂと非回転状態の外管１４ｂの先端部との間を気密状に閉塞する。
【００２８】
そして、圧縮空気供給ライン１２ａ及び切削液供給ライン１３ａから圧縮空気及び切削油が供給路部材１１に供給されるのであり、これにより、圧縮空気は外管１４ｂと内管１４ａの間である圧縮空気通路ｂ、圧縮空気溝形通路ｆ及び、円錐雄面部１７ｂの周囲空間を経てミスト出口部材２３のミスト出口通路ｅ１内に噴出され、また切削液は内管１４ａ内である液通路ａ、シート用円筒部材１９の中心孔、球弁体２０の周囲空間、切削液噴出ノズル部材１７の中心孔１７ａを経てミスト出口部材２３のミスト出口通路ｅ１内の中心部に噴出される。
【００２９】
そしてミスト出口通路ｅ１に噴出された切削液はミスト出口通路ｅ１に噴出されている圧縮空気をそれらの流動エネルギにより混合されて、微細な切削液粒子が空気中に均一状に分散された状態の切削液ミストとなされるのであり、この後、ミスト出口延長部２４のミスト出口通路ｅ２、刃具係止部材２８の前後向き透孔ｉ１、刃具２５のミスト通路ｋを経て刃具２５先端の出口開口ｍ、ｍから流出される。このように流出した切削液ミストは刃具２５とワークとの摩擦箇所を潤滑すると共に冷却するように作用する。
【００３０】
上記した主軸２や工具ホルダ８内での切削液ミストの流動中、ミスト出口延長部２４から流出した切削液ミストは刃具前後位置係止手段２７の前後向き透孔ｉ１、ｉ２とミスト出口延長部２４外周面との間に形成された環状隙間を通じて大気側に漏れ出ようとするが、主軸２の嵌入孔２ａの奥部から前方への流出は工具ホルダ８と主軸２との気密状の結合により阻止され、また嵌入孔２ａの奥部から後方への流出はリング状シール部材ｓにより阻止される。
【００３１】
上記のように刃具２５先端面の出口開口ｍ、ｍから流出される切削液ミストは圧力変化、速度変化、遠心力等に起因して液状化される傾向があるが、ミスト出口部材２３のミスト出口通路ｅ１や、ミスト出口延長部２４のミスト出口通路ｅ２が直線状であり前後方向へ向けての径変化が殆どない状態となされ、しかもミスト出口延長部２４のミスト出口通路ｅ２が刃具２５の後端部近傍にまで到達され、且つ、ミスト出口部材２３やミスト出口延長部２４が非回転状態に保持されているため、切削液ミストは大きな圧力変化や速度変化を抑制されると共に主軸２の回転による遠心力を受けるものとならないのであり、従ってミスト発生部１６から刃具２５の後端部近傍までにおける切削液ミストの液状化が効果的に抑制されるのである。
【００３２】
またミスト出口延長部２４から流出した切削液ミストは刃具係止部材２８の前後向き透孔ｉ１を経て刃具２５のミスト通路ｋ内に流入するのであり、この際、前後向き透孔ｉ１がミスト出口延長部２４のミスト出口通路ｅ２に出来るだけ近似した小径であり、しかも先細りの円錐雌面部ｊを介して刃具２５後端面の入口開口ｎに連通されると共に切削液ミストの流動距離を短くなされているため、切削液ミストは急激な圧力変化や速度変化を防止されると共に大きな遠心力を受けるものとならず、しかも遠心力を受ける期間が短時間となり、従って刃具係止部材２８内での液状化も効果的に抑制される。
【００３３】
また刃具２５のミスト通路ｋの大部分が刃具２５の中心に位置されているため、このミスト通路ｋ内を流れる切削液ミストはミスト通路ｋが刃具２５中心から離れた箇所に形成されている場合に較べて比較的小さな遠心力を受けるものとなり、従って切削液ミストは刃具２５内でも液状化を有効に抑制されるのである。さらにはミスト通路ｋがその前端部で二股に分岐されて刃具２５の先端面の特定直径の中心を挟む各側に出口開口ｍ、ｍを形成されているため、これら出口開口ｍ、ｍから流出した切削液ミストは刃具２５の先端面全体に均等化されて供給され効果的な潤滑を行うものとなる。
【００３４】
上記実施例は図３及び図４に示すように変形できるのであり、即ち、この変形例ではミスト出口部材２３にミスト出口延長部２４を形成することに代えて、ミスト出口部材２３と同体状で非回転状態に保持された外管１４ｂの先端部を延長させてミスト出口延長部２４を形成している。これ以外の構成は先のものと実質的に変わりないものとなされている。なお、図３及び図４中、先の実施例と実質的同一部位には同一符号が付してある。
【００３５】
【発明の効果】
以上のように構成した本発明によれば、回転駆動される主軸の内孔内に通路をなす内管と圧縮空気路をなす外管の二重管を非回転状態に内挿し、且つその前部にミスト発生部と切削液流出規制用弁手段を備えたものとなし、またミスト出口部材から刃具後端部近傍まで非回転状態のまま延長したミスト出口通路が形成されているため、ミスト出口部材から刃具後端部近傍まで流動している切削液ミストに主軸の回転による遠心力が作用して切削液ミストが液状化するのを効果的に阻止でき、これによりミスト発生部の発生した切削液ミストをミスト出口部材から適当な霧状のまま刃具後端部に到達させ、刃具内のミスト通路内を円滑に通過させ刃具先端開口から連続して安定的に流出させることができる。
【００３６】
またミスト出口部材にミスト出口延長部を形成したことにより、ミスト出口部材から刃具後端部近傍までのミスト出口通路を簡易構造により非回転状態に保持することができるのであり、またミスト出口部材から刃具後端部近傍までのミスト出口通路の断面積がその長さ方向位置の変化に対して急激に変化しない構造を簡易に実現でき、これによりミスト出口通路の断面積の急激な変化によるミスト出口通路内の切削液ミストの圧力変化に起因した液状化が抑制されるのである。
【００３７】
請求項２に記載した発明によれば、上記と同様な効果が得られる上、ミスト出口延長部が外管と同体状となるためその位置を安定的となすことができるほか、ミスト出口部材の前後長さを短くなすことができる。
【００３８】
請求項３に記載した発明によれば、工具ホルダ内に従来より設けられている刃具前後位置係止手段により、ミスト出口延長部のミスト出口通路と、刃具後端部のミスト通路とをこれらの間での切削液ミストの液状化の抑制される状態に連通させることができる。
【００３９】
請求項４に記載した発明によれば、工具ホルダを主軸に対し脱着する際に、工具ホルダの主軸嵌入部が主軸の中心孔に密状に案内された状態の下で、ミスト出口延長部を刃具前後位置係止手段の前後向き孔に対し出入りさせることができ、従ってミスト出口延長部と刃具前後位置係止手段との接触を何らの注意を要することなく回避することができるのである。
【００４０】
請求項５に記載した発明によれば、ミスト出口通路内を流れる切削液ミストの圧力変動を生じ難くなしてその液状化を抑制することができる。
【図面の簡単な説明】
【図１】本発明の一実施例である工作機械の主軸装置を示す側面視断面図である。
【図２】前記主軸装置の要部を示す側面視断面図である。
【図３】前記主軸装置の変形例を示す側面視断面図である。
【図４】前記変形例の要部を示す側面視断面図である。
【符号の説明】
１主軸
２ｂ中心孔（内孔）
２ｃ中心孔（内孔）
８工具ホルダ
８ｂ主軸内嵌入部
１６ミスト発生部
２３ミスト出口部材
２４ミスト出口延長部
２５刃具
２７刃具前後位置係止手段
ｈ中心孔（内孔）
ｉ１前後向き透孔
ｉ２前後向き透孔
ｅ１ミスト出口通路
ｅ２ミスト出口通路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spindle device of a machine tool in which cutting fluid mist is generated inside a spindle.
[0002]
[Prior art]
A tool in which a mist generating part is provided in the central hole of the main shaft that is rotationally driven, and the cutting fluid mist ejected from a non-rotating mist outlet member that is a part of the mist generating part is in front of the mist outlet member There are machine tools provided with a spindle device that is adapted to flow out from the tip opening of the blade through the center hole of the holder (see, for example, Japanese Patent No. 2687110 and Japanese Patent Laid-Open No. 11-235641).
[0003]
[Problems to be solved by the invention]
In the machine tool, the diameter of the mist passage from the front end of the mist outlet member to the rear end of the cutting tool changes relatively greatly, and the mist passage is rotated together with the main shaft, so that the cutting oil mist is generated in the mist passage. It may be liquefied by pressure change, speed change and centrifugal force action, and may not flow out of the tip opening of the cutting tool constantly, resulting in deterioration of processing quality or abnormal wear of the cutting tool.
Such a problem is particularly serious in a spindle device of a machine tool in which a cutting tool is attached by using a stub holder. An object of the present invention is to provide a spindle device of a machine tool that can cope with this.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, as described in claim 1 , the tool holder for fixing the cutting tool with the stub holder is provided at the rear end surface of the cutting tool into the center hole in which the screw part g is formed at the center. And a blade tool front / rear position locking means comprising a male screw member for changing and adjusting the front / rear position of the blade tool locking member to be screwed with the screw portion g. In the inner hole of the main shaft, a double pipe consisting of an inner pipe forming a cutting fluid passage and an outer pipe forming a compressed air passage is inserted in a non-rotating state, and a mist generating portion is provided at the front thereof. The cutting fluid mist ejected from the mist outlet member, which is a part of the machine tool, flows out from the tip of the cutting tool fixed to the stub holder through the inner hole of the tool holder in front of the mist outlet member. A spindle device comprising the mist outlet In addition to forming the mist outlet part for extending the tip of the outer tube to the vicinity of the rear end part of the cutting tool located in the inner hole of the tool holder in a state of containing the member, it is arranged in a non-rotating state, The mist generating portion includes a cylindrical cutting fluid ejection nozzle member, and the rear end of the nozzle member is provided in the front end portion of the inner tube, while the cutting fluid ejection nozzle member is a cylindrical member having a front-rear center hole. In addition, the front part is a tapered conical male surface part, and the diameter of the center hole part of the other rear end part is somewhat increased, and one end of the coil spring is inserted into this part in a forward movement restricted state. In addition, a cylindrical member for a sheet at a position on the rear side of the cutting fluid ejection nozzle member in the inner hole of the front end portion of the inner pipe, and a ball valve body pressed against the front end portion of the cylindrical member by the coil spring, Outside the cylindrical member so as to surround the ball valve body A structure in which a cutting fluid outlet regulating valve means comprising a cutting fluid valve body guide tube member obtained by integrating the ejection nozzle member for.
[0005]
The cutting fluid mist generated in the mist generating portion reaches the rear end portion of the cutting tool through the mist outlet member and the mist outlet passage of the mist outlet extension, and then passes through the mist passage formed in the cutting tool from the tip portion of the cutting tool. leak. At this time, since the mist outlet passage of the mist outlet extension is in a non-rotating state, the cutting fluid mist passing through the mist outlet passage is not subjected to the gas-liquid separation action caused by the centrifugal force due to the rotation of the main shaft. Therefore, the cutting fluid mist generated by the mist generating part reaches the rear end of the cutting tool from the mist outlet member in an appropriate mist state, flows smoothly through the mist passage in the cutting tool and is continuously stable from the tip of the cutting tool. Will flow out.
[0006]
The formation of the mist outlet extension on the mist outlet member contributes to easily and non-rotatingly holding the mist outlet passage from the mist outlet member to the vicinity of the rear end of the blade, and from the mist outlet member to the blade. This contributes to making the cross-sectional area of the mist outlet passage to the vicinity of the rear end portion not to change suddenly with respect to the change in the position in the length direction. Here, the fact that the cross-sectional area of the mist outlet passage does not change abruptly in the length direction of the mist outlet passage contributes to not causing liquefaction due to pressure change of the cutting fluid mist in the mist outlet passage. .
[0007]
The above-described invention can be modified as follows. That is, as described in claim 2, the distal end portion of the outer tube is extended in a state where the mist outlet member is included in the same body as the mist outlet member. Thus, the mist outlet extension is formed so as to reach the vicinity of the rear end of the cutting tool positioned in the inner hole of the tool holder in a non-rotating state. In this invention as well, the same effect as that of the invention of claim 1 can be obtained, the mist outlet member is shortened, and the positional stability of the mist outlet extension is improved. It becomes.
[0008]
Each of the above-described inventions should be embodied as follows.
That is, as described in claim 3, a front-rear direction through-hole is formed in the blade front-rear position locking means that abuts against the rear end of the blade tool in the tool holder to prevent rearward displacement of the blade tool. Insert the front end of the mist outlet extension into the through hole.
If it does in this way, the cutting tool front-and-rear position locking means conventionally provided in the tool holder can communicate the mist outlet passage of the mist outlet extension part and the mist passage of the rear end part of the cutting tool without any trouble.
[0009]
At this time, as described in claim 4, the insertion portion in the main shaft of the tool holder is formed in a right cylindrical shape, and the blade front / rear position locking means is provided inside the insertion portion, and the blade front / rear position locking means is provided. It is preferable to make the insertion length of the mist outlet extension portion into the front-rear facing through-hole shorter than the length of the main shaft insertion portion. In this way, when the tool holder is attached to or detached from the main shaft, the mist outlet extension is engaged with the front / rear position of the cutting tool under the condition that the main shaft insertion portion of the tool holder is closely guided in the inner hole of the main shaft. The mist outlet extension and the cutting tool front / rear position locking means can be prevented from contacting each other without any care.
[0010]
According to the fifth aspect of the present invention, the mist outlet passages of both the mist outlet member and the mist outlet extension are formed in a straight line and the diameter at an arbitrary position in the front-rear direction is set to a substantially constant size. In this way, the cross-sectional area of the mist outlet passage does not change greatly in relation to the change in the longitudinal length position of the mist outlet passage, and the mist outlets of both the mist outlet member and the mist outlet extension portion are not changed. Since the passage is linear, the pressure fluctuation of the cutting fluid mist flowing in the mist outlet passage hardly occurs, and the liquefaction is suppressed as described above.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side sectional view showing a main spindle device of a machine tool according to an embodiment of the present invention, FIG. 2 is a side sectional sectional view showing a main part of the main spindle device, and FIG. 3 shows a modification of the main spindle device. FIG. 4 is a side sectional view showing the main part of the modified example.
[0012]
In these drawings, reference numeral 1 denotes a main body frame of a main shaft device. A main shaft 2 is inserted into the main body frame 1 via ball bearings 3a and 3b so as to be rotatable at a fixed position.
At this time, 4 is a ring member bolted to the front end surface of the main body frame 1, 5 is an input gear externally fitted to the rear end portion of the main shaft 2 and key-fixed, and 6 is screwed to the rear end portion of the main shaft 2. Nut bodies 7a and 7b for restricting the withdrawal of the input gear 5 from the main shaft 2 are cylindrical spacers for restricting the front and rear positions of the ball bearings 3a and 3b.
[0013]
The main shaft 2 has a fitting hole 2a having a straight cylindrical female surface at the center of the tip, and three straight center holes 2b, 2c and 2d having different diameters are formed continuously from the fitting hole 2a. Has been made. Reference numeral 8 denotes a tool holder mainly composed of a holder main body 8 a, and a main shaft insertion portion 8 b forming a part of the holder main body 8 a is fitted in the insertion hole 2 a of the main shaft 2.
Reference numeral 9 denotes a transmission gear rotatably supported by the main body frame 1 and meshed with the input gear 5, and the rotation is transmitted from a motor (not shown).
[0014]
Reference numeral 10 denotes an additional frame provided at the rear of the main shaft 2. A through hole 10 a is provided in a portion immediately behind the main shaft 2 of the additional frame 10, and the cylindrical fitting portion 11 a of the supply path member 11 is provided in the through hole 10 a. And the rear portion of the supply path member 11 are bolted to the additional frame 10. A connection fitting 12 for connecting the compressed air supply line 12a and a connection fitting 13 for connecting the cutting fluid supply line 13a are screwed to the rear end portion of the supply path member 11.
[0015]
A straight supply pipe 14 that is not in contact with the main shaft 2 is inserted into the central hole 2d of the main shaft 2 concentrically with the straight center hole 2d in a non-rotating state. The straight supply pipe 14 is a double pipe composed of an inner pipe 14a and an outer pipe 14b. The inner hole of the inner pipe 14a serves as a liquid passage a, and compressed air is provided between the outer pipe 14b and the inner pipe 14a. It is a passage b.
[0016]
The front portion of the outer tube 14b is a small diameter portion c1, a ball bearing 15 for rotatably supporting the small diameter portion c1 between the small diameter portion c1 and the center hole 2c, and the small diameter portion c1 and the center hole 2b. A ring-shaped seal member s is provided on the front side of the ball bearing 15. The rear end portion of the inner tube 14a is inserted in a liquid-tight manner in the center hole of the connection fitting 13, and the front end portion of the inner tube 14a is fixed to the front end portion of the straight supply tube 14 in a non-rotating state. Liquid-tightly coupled to the rear portion of the mist generating section 16. At this time, an isolation ring plate r is provided between the ball bearing 15 and the ring-shaped seal member s so that they do not directly contact the inner ring of the ball bearing 15.
[0017]
The mist generating unit 16 makes the cutting fluid supplied through the liquid passage a into a mist by the compressed air supplied through the compressed air passage b, and will be described in detail with reference to FIG. is there.
That is, a cylindrical cutting fluid ejection nozzle member 17 is provided, and the rear end portion of the nozzle member 17 is fitted into the front end portion of the inner tube 14a. The cutting fluid ejection nozzle member 17 is a cylindrical member having a front and rear center hole 17a, the front portion is a tapered conical male surface portion 17b, and the diameter of the central hole 17a portion at the rear end is somewhat increased. In addition, one end of the coil spring 18 is inserted into a state in which forward movement is restricted.
[0018]
A cylindrical member 19 for a sheet is provided at a position on the rear side of the cutting fluid ejection nozzle member 17 in the inner hole at the front end portion of the inner tube 14a, and a ball valve pressed by the coil spring 18 against the seat portion at the front end of the cylindrical member 19 Cutting fluid outflow regulation comprising a body 20 and a valve body guide cylinder member 21 integrated with a cutting fluid ejection nozzle member 17 for externally fitting the cylindrical portion 19 so as to surround the ball valve body 20 A valve means 22 is formed. A mist outlet member 23 is fitted on the front small diameter portion of the cutting fluid ejection nozzle member 17, and the mist outlet member 23 is fitted on the small diameter portion of the outer tube 14b in an airtight manner by an O-ring.
[0019]
The mist outlet member 23 is formed as follows, that is, it has a tapered front male surface portion 23a, and the tapered male surface portion 23a is formed in the inner hole of the small diameter portion c1 of the outer tube 14b. The front surface of the cutting fluid ejection nozzle member 17 is fitted into the rear-side large-diameter hole d in an airtight manner while being in contact with the female surface part c2 to be prevented from moving forward, and the front-side diameter is small. The inner hole portion e1 is used as a mist outlet passage, and the tip of the conical male surface portion 17b is located at the inner center of the mist outlet passage e1. A passage f is formed, and the passage f is communicated with a space formed by the outer peripheral surface of the conical male surface portion 17b and the rear-side large inner hole portion d, and the compressed air in the compressed air passage b is compressed air groove type. Rear diameter large inner hole portion surrounding passage f and conical male surface portion 17b Inner space and are made as communicating with the front mist outlet passage f via the annular gap between the tip and the mist outlet passage e1 of the conical male surface part 17b,.
[0020]
The mist outlet member 23 is provided with a mist outlet extension 24 that is a straight cylindrical member having a relatively small diameter, and this extension 24 has a portion on the front side of the tapered female surface portion c2 at the tip of the outer tube 14b. That is, it is projected in a cantilevered manner forward through the front center hole of the tapered female surface portion c2. The mist outlet passage e2 formed at the center of the mist outlet extension 24 and the mist outlet passage e1 of the mist outlet member 23 are linear, and the diameters of the mist outlet passages e1 and e2 are arbitrary positions in the front-rear direction. The diameter is made to be substantially constant.
[0021]
The tool holder 8 is a stub holder 26 for fastening the peripheral surface portion of the cutting tool 25 positioned at the front portion of the holder main body 8a to be in a fixed state, and the main shaft insertion portion has a right cylindrical shape, and a screw portion at the center portion. A center hole h in which g is formed is formed, and a cutter front-rear position locking means 27 is formed in the center hole h.
This blade front / rear position locking means 27 is inserted into the center hole h and is engaged with a blade locking member 28 which is brought into contact with the rear end surface of the blade 25, and a screw portion g in the center hole h. And a male screw member 29 capable of changing and adjusting the front and rear positions of the blade 28, and front and rear through holes i1 and i2 are formed at the center of the blade locking member 28 and the male screw member 29. Yes. And the front-end | tip part of the mist exit extension part 24 is inserted in the inside of this through-hole i1, i2, and this insertion length is shorter than the front-back length of the main shaft insertion part 8b.
At this time, the front and rear through-holes i1 and i2 of the blade locking member 28 have a small diameter as close as possible to the mist outlet passage e2 of the mist outlet extension 24, and the blade 25 via the tapered conical female surface portion j. Continuing to the rear end, the flow distance of the cutting fluid mist is made as short as possible.
[0022]
The collet chuck 26 includes a collet 30 surrounding the peripheral surface portion of the cutting tool 25 and an operation nut portion 31 for displacing the collet 30 in the front-rear direction.
Further, the cutting tool 25 is formed with a mist passage k in a straight shape at the center, and the mist passage k is formed on each side of the front end portion of the cutting tool 25 that is bifurcated and sandwiches the center of the specific diameter of the front end surface of the cutting tool 25. The outlet openings m and m communicate with each other, and the rear end communicates with an inlet opening n formed at the center of the rear end face of the blade 25. In the illustrated example, the cutting tool 25 is a twist drill, but the present invention is not limited to this.
[0023]
Next, a usage example and operation of the spindle apparatus configured as described above will be described.
The attachment / detachment of the cutting tool 25 is performed by rotating the operation nut portion 31 of the stub holder 26 to the loose side to displace the collet 30 forward, whereby the center hole p of the collet 30 is in an expanded state. Thereafter, the rear portion of the cutting tool 25 is inserted into the center hole p of the collet 30, the rear end of the cutting tool 25 is brought into contact with the front surface of the cutting tool locking member 28, and the operation nut portion 31 is held while maintaining this contact state. The collet 30 is displaced backward by rotating to the fastening side. As a result, the collet 30 has its center hole p reduced in diameter by the wedge action of the tapered surface, and the cutting tool 25 is fastened to the holder body 8a in a fastening manner.
[0024]
When changing the front-rear position of the cutting tool 25 with respect to the holder body 8a, the connection between the spindle 2 and the tool holder 8 is released, the tool holder 8 is removed from the spindle 2, and then the cutting tool 25 is removed. Alternatively, the male screw member 29 is appropriately rotated under a state in which the cutting tool 25 can be displaced back and forth. Thereby, the male screw member 29 is displaced in a specific direction related to the rotational operation direction by the screw feeding action, and the position of the blade locking member 28 relative to the holder body 8a is adjusted. Thereafter, the cutting tool 25 in the tool holder 8 is fixed to the holder body 8a in a state where the rear end surface of the cutting tool 25 is in contact with the front end surface of the cutting tool locking member 28. The tool holder 8 in this state is fixed to the main spindle. Attach to 2.
[0025]
When the tool holder 8 is attached to and detached from the main shaft 2, the main shaft insertion portion 8b of the holder body 8a is extracted from the insertion hole 2a of the main shaft 2 or inserted into the insertion hole 8a of the main shaft 2. At this time, since the main shaft insertion portion 8b is guided in the accurate front-rear direction of the center of the main shaft 2 by the insertion hole 2a of the main shaft 2, the mist outlet extension 24 is provided in the front-rear direction through-holes i1, i2 of the cutter front-rear position locking means 27. The phenomenon of touching is avoided.
[0026]
Next, the situation when the workpiece is machined will be described. The main shaft 2 transmits the rotation of a motor (not shown) through the transmission gear 9 and the input gear 5 and is supported by the ball bearings 3a and 3b. Rotate at a specific position. Then, the rotation of the spindle 2 is transmitted to the blade 25 via the holder body 8a and the collet chuck 26. At this time, the blade front / rear position locking means 27 is also rotated in the same body as the holder body 8a.
[0027]
On the other hand, the straight supply pipe 14 is supported in a non-rotating state during rotation of the main shaft 2 because the front end portion is supported by the ball bearing 15 and the rear end portion is supported in the same shape as the additional frame 10. Therefore, the mist generating portion 16 provided in the same shape as the straight supply pipe 14 is also held in a non-rotating state. At this time, the ring-shaped sealing member s seals the space between the center hole 2b of the main shaft 2 in the rotating state and the tip of the outer tube 14b in the non-rotating state.
[0028]
Then, compressed air and cutting oil are supplied to the supply path member 11 from the compressed air supply line 12a and the cutting fluid supply line 13a, so that the compressed air is between the outer tube 14b and the inner tube 14a. The passage b, the compressed air groove-shaped passage f, and the peripheral space of the conical male surface portion 17b are ejected into the mist outlet passage e1 of the mist outlet member 23, and the cutting fluid is a liquid passage a in the inner pipe 14a, for sheet The mist outlet member 23 is ejected to the center of the mist outlet passage e1 through the central hole of the cylindrical member 19, the space around the ball valve body 20, and the central hole 17a of the cutting fluid ejection nozzle member 17.
[0029]
The cutting fluid ejected to the mist outlet passage e1 is mixed with the compressed air ejected to the mist outlet passage e1 by their flow energy, and the fine cutting fluid particles are uniformly dispersed in the air. After that, the mist outlet passage e2 of the mist outlet extension 24, the front and rear through hole i1 of the blade locking member 28, the mist passage k of the blade 25, and the outlet opening m at the tip of the blade 25 are formed. , M. The cutting fluid mist that has flowed out in this way acts to lubricate and cool the frictional portion between the cutting tool 25 and the workpiece.
[0030]
During the flow of the cutting fluid mist in the spindle 2 or the tool holder 8 described above, the cutting fluid mist flowing out from the mist outlet extension 24 is directed to the front and rear through holes i1 and i2 of the blade tool longitudinal position locking means 27 and the mist outlet extension. 24 attempts to leak out to the atmosphere through an annular gap formed between the outer peripheral surface and the outflow from the back of the insertion hole 2a of the main shaft 2 to the front is an airtight connection between the tool holder 8 and the main shaft 2. In addition, the ring-shaped seal member s prevents the outflow from the back of the fitting hole 2a to the rear.
[0031]
As described above, the cutting fluid mist flowing out from the outlet openings m, m on the front end surface of the cutting tool 25 tends to be liquefied due to pressure change, speed change, centrifugal force, etc., but the mist of the mist outlet member 23 The outlet passage e1 and the mist outlet passage e2 of the mist outlet extension 24 are straight and have almost no diameter change in the front-rear direction, and the mist outlet passage e2 of the mist outlet extension 24 is Since the mist outlet member 23 and the mist outlet extension 24 are held in a non-rotating state, the cutting fluid mist is suppressed from large pressure changes and speed changes and the spindle 2 Therefore, the liquefaction of the cutting fluid mist from the mist generating portion 16 to the vicinity of the rear end portion of the cutting tool 25 is effectively suppressed.
[0032]
Further, the cutting fluid mist flowing out from the mist outlet extension 24 flows into the mist passage k of the cutting tool 25 through the front and rear through hole i1 of the blade locking member 28. At this time, the front and rear through hole i1 is formed in the mist outlet. It has a small diameter that is as close as possible to the mist outlet passage e2 of the extension 24, communicates with the inlet opening n of the rear end surface of the cutting tool 25 through a tapered conical female surface portion j, and shortens the flow distance of the cutting fluid mist. Therefore, the cutting fluid mist is prevented from receiving a large centrifugal force while preventing a rapid change in pressure and speed, and the period of receiving the centrifugal force is short, and therefore the liquid in the blade locking member 28 is liquid. Is effectively suppressed.
[0033]
Further, since most of the mist passage k of the cutting tool 25 is located at the center of the cutting tool 25, the cutting fluid mist flowing in the mist passage k is formed at a location where the mist passage k is away from the center of the cutting tool 25. Therefore, the cutting fluid mist is effectively suppressed from being liquefied even in the cutting tool 25. Further, since the mist passage k is bifurcated at the front end portion thereof and the outlet openings m and m are formed on the respective sides sandwiching the center of the specific diameter of the front end face of the cutting tool 25, the mist passage k flows out from the outlet openings m and m. The cutting fluid mist is supplied evenly over the entire tip surface of the cutting tool 25 for effective lubrication.
[0034]
The above embodiment can be modified as shown in FIGS. 3 and 4, that is, in this modified example, instead of forming the mist outlet extension 24 on the mist outlet member 23, it is integrated with the mist outlet member 23. A mist outlet extension 24 is formed by extending the tip of the outer tube 14b held in a non-rotating state. The other configuration is substantially the same as the previous one. In FIGS. 3 and 4, the same reference numerals are assigned to substantially the same parts as in the previous embodiment.
[0035]
【The invention's effect】
According to the present invention configured as described above, the double pipe of the inner pipe that forms a passage in the inner hole of the main shaft that is rotationally driven and the outer pipe that forms the compressed air passage is inserted in a non-rotating state, and the front Since the mist generating part and the cutting fluid outflow regulating valve means are provided in the part, and a mist outlet passage extending from the mist outlet member to the vicinity of the rear end part of the cutting tool in a non-rotating state is formed, the mist outlet It is possible to effectively prevent the cutting fluid mist from liquefying due to the centrifugal force due to the rotation of the spindle on the cutting fluid mist flowing from the member to the vicinity of the rear end of the cutting tool. The liquid mist can reach the rear end portion of the blade tool from the mist outlet member in an appropriate mist state, smoothly pass through the mist passage in the blade tool, and can flow out continuously and stably from the blade tip opening.
[0036]
Further, by forming the mist outlet extension on the mist outlet member, the mist outlet passage from the mist outlet member to the vicinity of the rear end of the blade can be held in a non-rotating state by a simple structure, and from the mist outlet member It is possible to easily realize a structure in which the cross-sectional area of the mist outlet passage to the vicinity of the rear end of the cutting tool does not change abruptly with respect to the change in the position in the length direction. The liquefaction caused by the pressure change of the cutting fluid mist in the passage is suppressed.
[0037]
According to the second aspect of the present invention, the same effect as described above can be obtained, and the mist outlet extension can be integrated with the outer tube so that the position can be made stable. The front and rear length can be shortened.
[0038]
According to the invention described in claim 3, the mist outlet passage of the mist outlet extension portion and the mist passage of the rear end portion of the cutting tool are provided by the cutting tool front and rear position locking means conventionally provided in the tool holder. It is possible to communicate with a state in which liquefaction of the cutting fluid mist is suppressed.
[0039]
According to the invention described in claim 4, when the tool holder is detached from the main shaft, the mist outlet extension portion is placed under a state where the main shaft insertion portion of the tool holder is closely guided by the central hole of the main shaft. The front / rear direction hole of the blade front / rear position locking means can be moved in and out, so that contact between the mist outlet extension and the blade front / rear position locking means can be avoided without requiring any attention.
[0040]
According to the fifth aspect of the present invention, the pressure fluctuation of the cutting fluid mist flowing in the mist outlet passage hardly occurs and the liquefaction can be suppressed.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a main spindle device of a machine tool according to an embodiment of the present invention.
FIG. 2 is a side sectional view showing a main part of the spindle device.
FIG. 3 is a side sectional view showing a modification of the spindle device.
FIG. 4 is a side sectional view showing a main part of the modified example.
[Explanation of symbols]
1 Spindle 2b Center hole (inner hole)
2c Center hole (inner hole)
8 Tool holder 8b Main shaft insertion part 16 Mist generating part 23 Mist outlet member 24 Mist outlet extension part 25 Cutting tool 27 Cutting tool longitudinal position locking means h Center hole (inner hole)
i1 Front-rear direction through hole i2 Front-rear direction through-hole e1 Mist outlet passage e2 Mist outlet passage

Claims

A tool holder for fixing a cutting tool with a stub holder has a straight cylindrical shape in a main shaft insertion portion, and a cutting tool locking member in which a rear end surface of the cutting tool is brought into contact with a central hole in which a screw portion g is formed at the center. Cutting tool front / rear position locking means comprising a male screw member that changes and adjusts the front / rear position of the blade locking member screwed with the threaded portion g, and a cutting fluid is provided in the inner hole of the main shaft that is rotationally driven. A double pipe consisting of an inner pipe forming a passage and an outer pipe forming a compressed air path is inserted in a non-rotating state, and a mist generating portion is provided at the front portion thereof, and is ejected from a mist outlet member which is a part of the mist generating portion. A spindle device of a machine tool in which the cutting fluid mist is allowed to flow out from a tip end of a blade fixed to the stub holder through an inner hole of a tool holder forward of the mist outlet member, the mist outlet The tool mist outlet passage is The mist generating portion is provided with a cylindrical cutting fluid ejection nozzle member 17 in addition to being formed in a non-rotating state by being formed in a mist outlet extension for reaching the vicinity of the rear end of the cutting tool located in the inner hole of the blade. In addition, the rear end of the nozzle member 17 is installed in the front end portion of the inner pipe, while the cutting fluid ejection nozzle member 17 is formed into a cylindrical member having a front-rear center hole 17a, and the front portion is a tapered conical male surface portion 17b. The diameter of the central hole 17a portion of the other rear end portion is somewhat enlarged so that one end of the coil spring 18 is inserted into the forward movement restricted state in this portion, and the front end portion of the inner tube 14a A cylindrical member 19 for a sheet is provided at a position on the rear side of the cutting fluid ejection nozzle member in the inner hole of the cylinder, a ball valve body 20 pressed against the front end portion of the cylindrical member 19 by the coil spring 18, and the ball valve body 20 The circle to surround A spindle of a machine tool, characterized in that a cutting fluid outflow regulating valve means 22 comprising a valve body guide cylinder member 21 integrated with a cutting fluid ejection nozzle member 17 to be fitted on the member 19 is provided. apparatus.

The tool holder for fixing the cutting tool with the stub holder has a straight cylindrical insertion part in the main shaft, and a cutting tool locking member with which the rear end surface of the cutting tool comes into contact with the center hole in which the screw part g is formed at the center. And a cutting tool front / rear position locking means comprising a male screw member that changes and adjusts the front / rear position of the cutting tool locking member to be screwed with the threaded portion g, and a cutting fluid passage in an inner hole of the main shaft that is rotationally driven. The inner pipe forming the compressed air passage and the outer pipe forming the compressed air passage are inserted in a non-rotating state, and a mist generating portion is provided at the front thereof, and the mist generating member is ejected from a mist outlet member which is a part of the mist generating portion. A spindle device for a machine tool, in which a cutting fluid mist flows out from a tip end of a cutting tool fixed to the stub holder through an inner hole of a tool holder forward of the mist outlet member, the mist outlet member The tip of the outer tube Is formed at the mist outlet part for reaching the vicinity of the rear end part of the cutting tool located in the inner hole of the tool holder and arranged in a non-rotating state, and the mist generating part is a cylindrical cutting fluid ejection nozzle A member 17 is provided, and the rear end of the nozzle member 17 is installed in the front end portion of the inner tube. On the other hand, the cutting fluid ejection nozzle member 17 forms a cylindrical member having a center hole 17a facing forward and backward, and the front portion is tapered. A conical male surface portion 17b, and a diameter of the central hole 17a portion of the other rear end portion is somewhat increased so that one end of the coil spring 18 is inserted into the forward movement restricted state in this portion. A cylindrical member 19 for a sheet is provided at a position on the rear side of the cutting fluid ejection nozzle member in the inner hole of the front end portion of the pipe 14a, and a ball valve body 20 pressed against the front end portion of the cylindrical member 19 by the coil spring 18, Around this ball valve body 20 A cutting fluid outflow regulating valve means 22 comprising a valve body guide cylinder member 21 integrated with a cutting fluid ejection nozzle member 17 for external fitting to the cylindrical member 19 is provided. Spindle device for machine tools.

The spindle device for a machine tool according to claim 1 or 2 , wherein the front end portion of the mist outlet extension is inserted to the vicinity of the front-rear direction through-hole i1 of the blade member of the blade front-rear position locking means .

The tool holder main shaft insertion portion is formed into a fixed-length straight cylindrical shape, and the blade front / rear position locking means is provided inside the insertion portion, and the blade tool front / rear position locking means is mist into the front-rear-facing through hole. 4. The spindle device for a machine tool according to claim 3, wherein an insertion length of the outlet extension portion is shorter than a length of the insertion portion in the spindle.

The mist outlet passage formed in both the mist outlet member and the mist outlet extension is formed in a straight line, and the diameter at an arbitrary position in the front-rear direction is set to a substantially constant size. A machine tool according to any one of the above.