JP4770586B2 - Machine tool spindle equipment - Google Patents

Machine tool spindle equipment Download PDF

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JP4770586B2
JP4770586B2 JP2006142010A JP2006142010A JP4770586B2 JP 4770586 B2 JP4770586 B2 JP 4770586B2 JP 2006142010 A JP2006142010 A JP 2006142010A JP 2006142010 A JP2006142010 A JP 2006142010A JP 4770586 B2 JP4770586 B2 JP 4770586B2
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fluid supply
supply pipe
spindle
spindle device
machine tool
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JP2007307689A (en
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行高 牧野
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Denso Corp
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Denso Corp
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Description

本発明は、工作機械の主軸装置に関するものである。   The present invention relates to a spindle device of a machine tool.

近年、図３に示すような工作機械の主軸装置２００が広く用いられている。この工作機械の主軸装置２００は、中空円筒状のハウジング１１内に主軸部材１０とこの主軸部材１０を回転駆動する駆動モータ１２とが内蔵されたものである（例えば、特許文献１参照）。   In recent years, a spindle device 200 of a machine tool as shown in FIG. 3 has been widely used. The spindle device 200 of the machine tool includes a spindle member 10 and a drive motor 12 that rotationally drives the spindle member 10 in a hollow cylindrical housing 11 (see, for example, Patent Document 1).

主軸部材１０の先端部１０ａ付近の外枠、及び後端部１０ｂ付近の外枠には、軸受部材１３、１４が配置されており、主軸部材１０は軸受部材１３、１４を介して回転自在となるようにハウジング１１によって支持されている。主軸部材１０は、その先端部１０ａにワーク４０に対して所望の加工を行うための加工具（切削工具）２７を備えた工具ホルダ１５を装着する装着穴１６が形成されており、さらに、この装着穴１６から後端部１０ｂに貫通する貫通穴２１が形成されている。   Bearing members 13 and 14 are disposed on the outer frame near the front end 10a and the outer frame near the rear end 10b of the main shaft member 10, and the main shaft member 10 is rotatable via the bearing members 13 and 14. It is supported by the housing 11 so as to be. The spindle member 10 is provided with a mounting hole 16 for mounting a tool holder 15 provided with a processing tool (cutting tool) 27 for performing desired processing on the workpiece 40 at the distal end portion 10a. A through hole 21 penetrating from the mounting hole 16 to the rear end portion 10b is formed.

貫通穴２１内には、ワーク４０に対して加工を行うときの潤滑冷却に用いられる流体を工具ホルダ１５や切削工具２７に向けて供給する流体供給管２４が配置されている。流体供給管２４は、その前端部２４ａがドローバー１７の内側に設けられたインナースリーブ２２に内挿され、その後端部２４ｂが取付部材３０を介して供給装置２９と接続されている。   In the through hole 21, a fluid supply pipe 24 that supplies fluid used for lubrication and cooling when machining the workpiece 40 toward the tool holder 15 and the cutting tool 27 is disposed. The fluid supply pipe 24 has a front end 24 a inserted in an inner sleeve 22 provided inside the draw bar 17, and a rear end 24 b connected to a supply device 29 via an attachment member 30.

ワーク４０に対して加工を行うときの潤滑冷却用の流体としては、高圧空気に粘性を有する微小量の切削油を混入して霧状にしたもの（オイルミスト）が用いられており、このオイルミストはワーク４０に対して加工をおこなうとき、供給装置２９より流体供給管２４の後端部２４ｂから供給され、流体供給管２４を流動して前端部２４ａ、インナースリーブ２２を経て工具ホルダ１５や切削工具２７に到達する。
特開２００２−１７２５３９号公報 As the fluid for lubrication and cooling when machining the workpiece 40, a fluid (oil mist) made by mixing a minute amount of viscous cutting oil into high-pressure air is used. When processing the workpiece 40, the mist is supplied from the rear end portion 24b of the fluid supply pipe 24 from the supply device 29, flows through the fluid supply pipe 24, passes through the front end portion 24a, the inner sleeve 22, and the tool holder 15 or the like. The cutting tool 27 is reached.
JP 2002-172539 A

しかしながら、特許文献１で開示された発明によれば、主軸部材１０が回転するとき（ワーク４０に対して加工を行うとき）は、主軸部材１０とともに流体供給管２４も回転する。このとき、流体供給管２４内をオイルミストが流動すると、オイルミストは流体供給管２４の回転に伴って発生する遠心力の影響を受けて、流動途中で流体供給管２４の内壁面に付着することがある。すると、オイルミストの流動量が減少し、インナースリーブ２２（工具ホルダ１５）まで十分な量のオイルミストを到達させることができないという問題があった。さらには、
また、流体供給管２４の回転に伴って、流体供給管２４に振動やたわみが発生することがある。すると、流体供給管２４の前端部２４ａがインナースリーブ２２やドローバー１７等と接触して、流体供給管２４やインナースリーブ２２、ドローバー１７等が破損することがあった。 However, according to the invention disclosed in Patent Document 1, when the main shaft member 10 rotates (when the workpiece 40 is processed), the fluid supply pipe 24 also rotates together with the main shaft member 10. At this time, when the oil mist flows in the fluid supply pipe 24, the oil mist is affected by the centrifugal force generated with the rotation of the fluid supply pipe 24 and adheres to the inner wall surface of the fluid supply pipe 24 during the flow. Sometimes. Then, the flow amount of the oil mist decreases, and there is a problem that a sufficient amount of oil mist cannot reach the inner sleeve 22 (tool holder 15). Moreover,
Further, as the fluid supply pipe 24 rotates, vibration or deflection may occur in the fluid supply pipe 24. Then, the front end portion 24a of the fluid supply pipe 24 may come into contact with the inner sleeve 22, the draw bar 17, etc., and the fluid supply pipe 24, the inner sleeve 22, the draw bar 17, etc. may be damaged.

そこで、本発明は以上のような課題に鑑みてなされたものであり、その目的は、ワークに対して加工を行うとき（主軸部材の回転時）において、主軸部材の貫通穴内に配置された流体供給管の内壁面にオイルミストが付着すること防ぎ、オイルミストの流動量を減少させることなく、十分な量のオイルミストをインナースリーブ（工具ホルダ）まで到達させることができるとともに、流体供給管に発生する振動やたわみ等を抑制し、流体供給管やインナースリーブ、ドローバー等の破損を防ぐことができる工作機械の主軸装置を提供することにある。   Accordingly, the present invention has been made in view of the above-described problems, and the object thereof is to provide a fluid disposed in a through hole of the spindle member when machining the workpiece (when the spindle member rotates). The oil mist can be prevented from adhering to the inner wall surface of the supply pipe, and a sufficient amount of oil mist can reach the inner sleeve (tool holder) without reducing the flow rate of the oil mist. An object of the present invention is to provide a spindle device for a machine tool that can suppress vibrations, deflections, and the like, and can prevent damage to a fluid supply pipe, an inner sleeve, a draw bar, and the like.

上記課題を解決するために、請求項１に係る工作機械の主軸装置は、ワークに対して所定の加工を行う加工具が主軸部材に装着され、当該加工具を回転駆動させる工作機械の主軸装置であって、主軸部材には、主軸装置の回転軸に沿って貫通穴が形成されており、当該貫通穴内に挿入され、加工具が所定の加工を行うときに当該加工具に潤滑冷却用の流体を供給する流体供給管と、主軸装置と流体供給管との間に設けられ、流体供給管を主軸部材に対して回転可能に支持する軸受部材と、流体供給管の両端は、主軸装置の回転部分に接続されており、当該接続部に設けられた、主軸装置の回転を減衰して流体供給管に伝達する回転減衰機能を有するラビリンスシールとを備え、所定の加工を行うときにおける流体供給管の回転数は、主軸部材の回転数よりも少ないことを特徴とする。 In order to solve the above-mentioned problem, a spindle device of a machine tool according to claim 1 is provided with a spindle device of a machine tool in which a machining tool for performing predetermined machining on a workpiece is mounted on a spindle member, and the machining tool is driven to rotate. In the spindle member, a through hole is formed along the rotation axis of the spindle device, and the spindle member is inserted into the through hole. A fluid supply pipe for supplying fluid, a bearing member provided between the spindle device and the fluid supply pipe, and rotatably supporting the fluid supply pipe with respect to the spindle member, and both ends of the fluid supply pipe are connected to the spindle device. is connected to the rotating portion, provided in the connection section, the fluid at the time when attenuates the rotation of the main spindle and a labyrinth seal having a rotating attenuation function of transmitting to the fluid supply tube, performs predetermined processing The number of rotations of the supply pipe Characterized in that less than the rotational speed.

請求項１に記載の発明によれば、ワークに対して加工を行うとき（主軸装置の回転時）、流体供給管の回転数を主軸部材の回転数よりも大幅に少なくすることができる。   According to the first aspect of the present invention, when machining a workpiece (when the spindle device is rotating), the number of rotations of the fluid supply pipe can be significantly less than the number of rotations of the spindle member.

これにより、流体供給管内のオイルミスト（潤滑冷却用の流体）は、流体供給管の回転に伴って生じる遠心力の影響を受けにくくなり、流体供給管の内壁面に付着しにくくなる。したがって、オイルミストの流動量を減少させることなく、十分な量のオイルミストを加工具まで到達させることができる。さらに、流体供給管は、軸受部材により主軸部材に対して回転可能に支持されているので、流体供給管に発生する振動やたわみが抑制され、流体供給管やインナースリーブ、ドローバー等の破損を防ぐことができる。なお、主軸装置の回転を減衰して流体供給管に伝達する回転減衰機能を有するシール部材の構造としては、ラビリンスシールが好適である。 Thereby, the oil mist (fluid for lubricating cooling) in the fluid supply pipe is not easily affected by the centrifugal force generated with the rotation of the fluid supply pipe, and is difficult to adhere to the inner wall surface of the fluid supply pipe. Therefore, a sufficient amount of oil mist can reach the processing tool without reducing the flow amount of oil mist. Furthermore, since the fluid supply pipe is rotatably supported with respect to the main shaft member by the bearing member, vibration and deflection generated in the fluid supply pipe are suppressed, and damage to the fluid supply pipe, the inner sleeve, the draw bar, and the like is prevented. be able to. As the structure of the sealing member having a rotational damping function to attenuate the rotation of the spindle device is transmitted to the fluid supply pipe, La Birinsushi Le is preferred.

請求項２に係る工作機械の主軸装置は、請求項１に記載の工作機械の主軸装置において、流体供給管はその外枠におもりが装着され、重量バランスに偏りが生じていることを特徴とする。請求項２に記載の発明によれば、おもりを流体供給管の外枠下側に装着すれば、流体供給管の重心は軸心よりも下方にあることとなる。これにより、主軸部材の回転方向が短時間で反対方向に変更されるような場合であっても、流体供給管の回転数は、主軸部材の回転数よりも少なくすることができる。 The spindle device of the machine tool according to claim 2 is characterized in that, in the spindle device of the machine tool according to claim 1 , a weight is attached to the outer frame of the fluid supply pipe, and the weight balance is biased. To do. According to the second aspect of the present invention, if the weight is attached to the lower side of the outer frame of the fluid supply pipe, the center of gravity of the fluid supply pipe is located below the axis. Thereby, even if it is a case where the rotation direction of a main shaft member is changed to an opposite direction in a short time, the rotation speed of a fluid supply pipe | tube can be made smaller than the rotation speed of a main shaft member.

請求項３に係る工作機械の主軸装置は、請求項１に記載の工作機械の主軸装置において、流体供給管は潤滑冷却用の流体が流動する流動路が前記流体供給管の軸心から偏って形成され、重量バランスに偏りが生じていることを特徴とする。請求項３に記載の発明によれば、肉厚が厚い部分が下側となるように流体供給管を設置すれば、流体供給管の重心は軸心よりも下方あることとなる。これにより、主軸部材の回転方向が短時間で反対方向に変更されるような場合であっても、流体供給管の回転数は、主軸部材の回転数よりも少なくすることができる。 The spindle device of the machine tool according to claim 3 is the spindle device of the machine tool according to claim 1, wherein the fluid supply pipe has a flow path in which a fluid for lubrication cooling flows deviates from an axis of the fluid supply pipe. It is formed and the weight balance is biased. According to the third aspect of the present invention, if the fluid supply pipe is installed so that the thick part is on the lower side, the center of gravity of the fluid supply pipe is below the axis. Thereby, even if it is a case where the rotation direction of a main shaft member is changed to an opposite direction in a short time, the rotation speed of a fluid supply pipe | tube can be made smaller than the rotation speed of a main shaft member.

以下、本発明の実施形態について図面に基づいて説明する。なお、各図において同一、もしくは、均等である部分には同一の符号を付してその説明を省略する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or is equivalent, and the description is abbreviate | omitted.

（第１の実施形態）
図１は、本発明の第１の実施形態に係る工作機械の主軸装置１００、及び加工具としての工具ホルダ１５の概略断面図である。先ず、工具ホルダ１５について説明する。なお、図１では１面拘束型の工具ホルダ１５を示しているが、工具ホルダ１５のフランジ部１５ａが主軸部材１０の端面（先端部１０ａ）に当接する、いわゆる２面拘束型の工具ホルダとしてもよい。 (First embodiment)
FIG. 1 is a schematic cross-sectional view of a spindle device 100 of a machine tool and a tool holder 15 as a processing tool according to a first embodiment of the present invention. First, the tool holder 15 will be described. Although FIG. 1 shows a single-surface constrained tool holder 15, a so-called two-surface constrained tool holder in which the flange portion 15a of the tool holder 15 abuts on the end surface (tip portion 10a) of the spindle member 10 is used. Also good.

工具ホルダ１５は、一端にワーク４０に対して加工を行う切削工具２７が装着されており、他端に工具ホルダ１５に固定されたプルスタッド１９を備えている。プルスタッド１９、工具ホルダ１５、切削工具２７の内部には、軸ＡＡに沿った空洞部が形成されており、この空洞部内には潤滑冷却用の流体としてのオイルミストが流動する流動管２８が配置されている。流動管２８の両端部は、工具ホルダ１５の回転を減衰して流動管２８に伝達するシール部材を介して切削工具２７、プルスタッド１９と接続されている。   The tool holder 15 is equipped with a cutting tool 27 for machining the workpiece 40 at one end and a pull stud 19 fixed to the tool holder 15 at the other end. A cavity along the axis AA is formed inside the pull stud 19, the tool holder 15, and the cutting tool 27, and a fluid pipe 28 in which oil mist as a fluid for lubricating cooling flows is formed in the cavity. Has been placed. Both end portions of the flow tube 28 are connected to the cutting tool 27 and the pull stud 19 via a seal member that attenuates the rotation of the tool holder 15 and transmits it to the flow tube 28.

ワーク４０に対して加工を行なうときは、後述する供給装置２９により供給されるオイルミストが流体供給管２４、及び流動管２８を流動し切削工具２７に到達することで、加工時の潤滑冷却が行なわれる。したがって、十分な量のオイルミストが切削工具２７に到達することが望ましい。   When machining the workpiece 40, oil mist supplied by a supply device 29 described later flows through the fluid supply pipe 24 and the flow pipe 28 and reaches the cutting tool 27, so that lubrication cooling at the time of machining is performed. Done. Therefore, it is desirable that a sufficient amount of oil mist reaches the cutting tool 27.

次に、十分な量のオイルミストを切削工具２７に到達させることができる本実施形態に係る工作機械の主軸装置１００について説明する。工作機械の主軸装置１００は、中空円筒状のハウジング１１内に主軸部材１０とその主軸部材１０を回転駆動させるための駆動モータ１２（１２ａ、１２ｂ）とを内蔵するビルトインタイプである。   Next, the spindle device 100 of the machine tool according to the present embodiment capable of causing a sufficient amount of oil mist to reach the cutting tool 27 will be described. A spindle device 100 of a machine tool is a built-in type in which a spindle member 10 and a drive motor 12 (12a, 12b) for rotating the spindle member 10 are housed in a hollow cylindrical housing 11.

主軸部材１０の先端部１０ａ付近、及び後端部１０ｂ付近には、ハウジング１１と主軸部材１０との間に軸受部材１３、１４が配置されており、主軸部材１０は軸受部材１３、１４によりハウジング１１に対して回転自在となるように支持されている。駆動モータ１２は、軸受部材１３、１４のほぼ中間部分に配置されており、主軸部材１０側（内側）にロータ１２ａが配置され、ハウジング１１側（外側）にステータ１２ｂが配置されることにより構成されている。   Bearing members 13 and 14 are disposed between the housing 11 and the main shaft member 10 in the vicinity of the front end portion 10a and the rear end portion 10b of the main shaft member 10, and the main shaft member 10 is accommodated by the bearing members 13 and 14 in the housing. 11 is supported so as to be freely rotatable. The drive motor 12 is disposed at a substantially intermediate portion between the bearing members 13 and 14, and is constituted by a rotor 12a disposed on the main shaft member 10 side (inner side) and a stator 12b disposed on the housing 11 side (outer side). Has been.

主軸部材１０は、その先端部１０ａにワーク４０に対して加工を行う加工具（切削工具）２７を備えた工具ホルダ１５を挿入装着するための装着穴１６が形成されており、この装着穴１６から後端部１０ｂに貫通する貫通穴２１が形成されている。   The spindle member 10 has a mounting hole 16 for inserting and mounting a tool holder 15 provided with a processing tool (cutting tool) 27 for processing the workpiece 40 at the distal end portion 10a. A through-hole 21 is formed so as to penetrate from the rear end portion 10b to the rear end portion 10b.

貫通穴２１内には、周知構造のドローバー１７が貫通穴２１の貫通方向に進退動可能に配置されている。ドローバー１７の先端には、工具ホルダ１５が装着穴１６に装着されたときにプルスタッド１９を挟み込むためのコレットチャック２０が配置されている。コレットチャック２０は、バネ１８の作用によりドローバー１７が進退動することで開閉自在となっている。コレットチャック２０がプルスタッド１９を挟み込んだ後、図示しない駆動機構（例えば、油圧式シリンダ装置）によって、ドローバー１７を介して工具ホルダ１５を装着穴１６に引っ張り込むことで工具ホルダ１５は主軸部材１０に保持される。   In the through hole 21, a draw bar 17 having a known structure is disposed so as to be able to advance and retract in the through direction of the through hole 21. A collet chuck 20 for sandwiching the pull stud 19 when the tool holder 15 is mounted in the mounting hole 16 is disposed at the tip of the draw bar 17. The collet chuck 20 can be opened and closed as the draw bar 17 moves forward and backward by the action of the spring 18. After the collet chuck 20 sandwiches the pull stud 19, the tool holder 15 is pulled into the mounting hole 16 via the draw bar 17 by a driving mechanism (for example, a hydraulic cylinder device) (not shown), whereby the tool holder 15 is moved to the main shaft member 10. Retained.

また、貫通穴２１内には、ワーク４０に対して加工を行うときの潤滑冷却に用いられる流体（オイルミスト）を工具ホルダ１５に向けて供給する金属製（例えば、鉄製）の流体供給管２４が挿入配置されており、流体供給管２４の前端部２４ａは、インナースリーブ２２に接続されるとともに主軸部材１０と流体供給管２４との間に配置された軸受部材２５で支持されており、流体供給管２４の後端部２４ｂは、取付部材３０に接続されるとともに取付部材３０に配置された軸受部材２６で支持されている。   In addition, a metal (for example, iron) fluid supply pipe 24 that supplies fluid (oil mist) used for lubrication and cooling when machining the workpiece 40 toward the tool holder 15 is provided in the through hole 21. The front end 24a of the fluid supply tube 24 is connected to the inner sleeve 22 and supported by a bearing member 25 disposed between the main shaft member 10 and the fluid supply tube 24. The rear end 24 b of the supply pipe 24 is connected to the attachment member 30 and supported by a bearing member 26 disposed on the attachment member 30.

取付部材３０には、高圧空気に粘性を有する微小量の切削油を混入して霧状にしたオイルミストを供給する供給装置が２９が接続されている。供給装置２９により供給されたオイルミストは、主軸部材１０及び取付部材３０とは回転を共にしないロータリージョイント２３を経て、流体供給管２４内を流動する。   A supply device 29 is connected to the attachment member 30 to supply oil mist that is atomized by mixing a small amount of viscous cutting oil into high-pressure air. The oil mist supplied by the supply device 29 flows through the fluid supply pipe 24 through the rotary joint 23 that does not rotate with the main shaft member 10 and the attachment member 30.

ここで、ワーク４０に対して加工を行うとき、主軸部材１０が回転すると、インナースリーブ２２及び取付部材３０は、主軸部材１０とともに回転するが、流体供給管２４の両端２４ａ、２４ｂの接続部には、主軸部材１０の回転を減衰して流体供給管２４に伝達するシール部材が配置されているため、流体供給管２４の回転数は主軸部材１０の回転数よりも少なくなる。回転減衰機能を有するシール部材としては、例えば、周知構造である非接触型シールであるラビリンスシールを用いることができる。これにより、主軸部材１０は毎分数千回転以上の回転数で回転するのに対して、流体供給管２４の回転数は毎分数〜十数回転程度とすることができる。   Here, when processing the workpiece 40, when the main shaft member 10 rotates, the inner sleeve 22 and the mounting member 30 rotate together with the main shaft member 10, but at the connection portions of both ends 24 a and 24 b of the fluid supply pipe 24. Since the seal member that attenuates the rotation of the main shaft member 10 and transmits it to the fluid supply pipe 24 is disposed, the rotation speed of the fluid supply pipe 24 is less than the rotation speed of the main shaft member 10. As the seal member having a rotational damping function, for example, a labyrinth seal that is a non-contact type seal having a well-known structure can be used. As a result, the main shaft member 10 rotates at a rotational speed of several thousand revolutions per minute, whereas the rotational speed of the fluid supply pipe 24 can be about several to ten and several revolutions per minute.

したがって、、本実施形態に係る工作機械用の主軸装置１００によれば、流体供給管２４内を流動するオイルミストは、遠心力の影響を受けにくくなるため、流体供給管２４の内壁面にオイルミストが付着しにくくなり、オイルミストの流動量が減少することなく、十分な量のオイルミストがインナースリーブ２２（工具ホルダ１５）に到達する。   Therefore, according to the spindle device 100 for a machine tool according to the present embodiment, the oil mist flowing in the fluid supply pipe 24 is not easily affected by the centrifugal force. It becomes difficult for mist to adhere, and a sufficient amount of oil mist reaches the inner sleeve 22 (tool holder 15) without decreasing the flow amount of oil mist.

インナースリーブ２２とプルスタッド１９との接触面４１は、図示しない弾性体、又は金属製のパッキンで封止されており、インナースリーブ２２まで到達したオイルミストは、漏れ出ことなく工具ホルダ１５の流動管２８に送り込まれる。流動管２８に送り込まれたオイルミストは、切削工具２７の回転に伴って発生する遠心力、及び供給装置２９の高圧空気の作用によって、吐出路（図示せず）からワーク４０に向けて吐出され、これにより、オイルミストによるワーク加工時の潤滑冷却が実行される。   The contact surface 41 between the inner sleeve 22 and the pull stud 19 is sealed with an unillustrated elastic body or metal packing, and the oil mist that has reached the inner sleeve 22 flows through the tool holder 15 without leaking. It is fed into the tube 28. The oil mist sent to the flow pipe 28 is discharged toward the workpiece 40 from a discharge path (not shown) by the centrifugal force generated with the rotation of the cutting tool 27 and the action of the high-pressure air of the supply device 29. As a result, lubrication cooling is performed when the workpiece is machined with oil mist.

さらに、本実施形態に係る工作機械用の主軸装置１００によれば、流体供給管２４はその前端部２４ａ、後端部２４ｂは軸受部材２５、２６により支持されているので、流体供給管２４に発生する振動やたわみを抑制することができ、流体供給管２４やインナースリーブ２２、ドローバー１７等の破損を防ぐことができる。   Furthermore, according to the spindle device 100 for a machine tool according to the present embodiment, the fluid supply pipe 24 is supported by the front end portion 24a and the rear end portion 24b by the bearing members 25 and 26. The generated vibration and deflection can be suppressed, and damage to the fluid supply pipe 24, the inner sleeve 22, the draw bar 17, and the like can be prevented.

（その他の実施形態）
本発明のその他の実施形態について図２を用いて説明する。図２（ａ）は、本発明のその他の実施形態に係る工作機械の主軸装置１１０の概略断面を示す図面である。図２（ｂ）は、流体供給管２４の図面下側におもり５１を配置した状態の断面図である。図２（ｃ）は、流体供給管５４の断面図である。 (Other embodiments)
Another embodiment of the present invention will be described with reference to FIG. FIG. 2A is a drawing showing a schematic cross section of a spindle device 110 of a machine tool according to another embodiment of the present invention. FIG. 2B is a cross-sectional view of a state in which a weight 51 is arranged on the lower side of the fluid supply pipe 24 in the drawing. FIG. 2C is a cross-sectional view of the fluid supply pipe 54.

（その１）
工作機械の主軸装置１１０を構成する主軸部材１０は左右両方向に回転可能であり、ワーク４０に対する加工条件の設定等により主軸部材１０の回転方向が短時間で反対方向に変更されることがある。しかしながら、このような場合においても、オイルミストの流動量を減少させないために、主軸部材１０の回転数よりも流体供給管２４の回転数が少ないことが望ましい。さらには、流体供給管２４は非回転であることが望ましい。 (Part 1)
The spindle member 10 constituting the spindle device 110 of the machine tool can rotate in both the left and right directions, and the rotation direction of the spindle member 10 may be changed to the opposite direction in a short time depending on the setting of machining conditions for the workpiece 40 and the like. However, even in such a case, it is desirable that the number of rotations of the fluid supply pipe 24 is smaller than the number of rotations of the main shaft member 10 in order not to reduce the flow rate of the oil mist. Furthermore, the fluid supply pipe 24 is preferably non-rotating.

そこで、本実施形態に係る主軸装置１１０が組み込まれる工作機械が水平型（横置型）の場合、図２（ｂ）に示すように、流体供給管２４の外枠下側におもり５１を装着すれば、流体供給管２４の重量バランスに偏りが生じ、流体供給管２４の重心は軸心よりも下方にあることとなる。発明者の知見によると、これにより、主軸部材１０の回転数よりも流体供給管２４の回転数を少なくすることができる。さらに、おもり５１の重さを調節することで、主軸装置１０の回転に係わらず、流体供給管２４を非回転とすることができる。   Therefore, when the machine tool in which the spindle device 110 according to this embodiment is incorporated is a horizontal type (horizontal type), a weight 51 is attached to the lower side of the outer frame of the fluid supply pipe 24 as shown in FIG. For example, the weight balance of the fluid supply pipe 24 is biased, and the center of gravity of the fluid supply pipe 24 is located below the axis. According to the inventor's knowledge, this makes it possible to reduce the rotational speed of the fluid supply pipe 24 relative to the rotational speed of the main shaft member 10. Furthermore, by adjusting the weight of the weight 51, the fluid supply pipe 24 can be made non-rotating regardless of the rotation of the spindle device 10.

なお、本実施形態においては、図２（ｂ）に示すように、おもり５１を流体供給管２４のほぼ中央部付近に装着しているが、おもり５１を装着する位置はこれに限られず、おもり５１を所望の位置に装着しても同様の効果を得ることができる。   In this embodiment, as shown in FIG. 2B, the weight 51 is mounted in the vicinity of the center of the fluid supply pipe 24. However, the position where the weight 51 is mounted is not limited to this, and the weight 51 Even if 51 is mounted at a desired position, the same effect can be obtained.

（その２）
おもり５１を流体供給管２４の外枠下側に装着する代わりに、オイルミストが流動する流動路５５を軸心から偏って形成した流体供給管５４を用いることでも、主軸装置１０の回転数よりも流体供給管５４の回転数を少なくすることができる。 (Part 2)
Instead of attaching the weight 51 to the lower side of the outer frame of the fluid supply pipe 24, the fluid supply pipe 54 in which the flow path 55 through which the oil mist flows is formed so as to be offset from the axial center can also be used. Also, the rotational speed of the fluid supply pipe 54 can be reduced.

すなわち、図２（ｃ）にその断面を示す流体供給管５４のように、流動路５５を軸心から偏って形成することで、流体供給管５４には肉厚が厚い部分５２及び薄い部分５３が形成される。そして、肉厚が厚い部分５２が下側となるように流体供給管５４を貫通穴２１内に設置すれば、流体供給管５４の重量バランスに偏りが生じ、流体供給管５４の重心は軸心よりも下方にあることとなる。発明者の知見によると、これにより、主軸装置１０の回転数よりも流体供給管５４の回転数を少なくすることができる。さらに、流動路５５の位置を調節することで、主軸装置１０の回転に係わらず、流体供給管５４を非回転とすることができる。   That is, the fluid supply pipe 54 is formed so as to be offset from the axial center as in the fluid supply pipe 54 whose cross section is shown in FIG. Is formed. If the fluid supply pipe 54 is installed in the through hole 21 so that the thick part 52 is on the lower side, the weight balance of the fluid supply pipe 54 is biased, and the center of gravity of the fluid supply pipe 54 is the axial center. Will be below. According to the inventor's knowledge, this makes it possible to reduce the rotational speed of the fluid supply pipe 54 compared to the rotational speed of the spindle device 10. Furthermore, by adjusting the position of the flow path 55, the fluid supply pipe 54 can be made non-rotating regardless of the rotation of the spindle device 10.

以上、本発明を実施するための最良の形態について説明したが、本発明は上述した実施形態のみに限定されるものではなく、本発明の趣旨を逸脱しない範囲において、数々の変形実施が可能である。   Although the best mode for carrying out the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. is there.

また、本発明のうち従属請求項に係る発明においては、従属先の請求項の構成要件の一部を省略する構成とすることもできる。   In the invention according to the dependent claims of the present invention, a part of the constituent features of the dependent claims can be omitted.

本発明の第１の実施形態に係る工作機械の主軸装置の概略断面を示す図である。It is a figure which shows the schematic cross section of the spindle apparatus of the machine tool which concerns on the 1st Embodiment of this invention. （ａ）は、本発明のその他の実施形態に係る工作機械の主軸装置の概略断面を示す図、（ｂ）及び（ｃ）は、その他の実施形態に係る工作機械の主軸装置に好適に用いられる流体供給管の断面図である。(A) is a figure which shows the schematic cross section of the spindle apparatus of the machine tool which concerns on other embodiment of this invention, (b) and (c) are used suitably for the spindle apparatus of the machine tool which concerns on other embodiment. It is sectional drawing of the fluid supply pipe | tube used. 従来の工作機械の主軸装置の概略断面を示す図である。It is a figure which shows the schematic cross section of the spindle apparatus of the conventional machine tool.

符号の説明Explanation of symbols

１０・・・主軸部材、１１・・・ハウジング、１２・・・駆動モータ、１３，１４，２５，２６・・・軸受部材、１５・・・工具、１６・・・装着穴、１７・・・ドローバー、１８・・・バネ、１９・・・プルスタッド、２０・・・コレットチャック、２１・・・貫通穴、２２・・・インナースリーブ、２３・・・ロータリージョイント、２４、５４・・・流体供給管、２７・・・切削工具、２８・・・空洞部、２９・・・供給装置、３０・・・取付部材、５１・・・おもり、５５・・・流動路 DESCRIPTION OF SYMBOLS 10 ... Main shaft member, 11 ... Housing, 12 ... Drive motor, 13, 14, 25, 26 ... Bearing member, 15 ... Tool, 16 ... Mounting hole, 17 ... Drawbar, 18 ... Spring, 19 ... Pull stud, 20 ... Collet chuck, 21 ... Through hole, 22 ... Inner sleeve, 23 ... Rotary joint, 24, 54 ... Fluid Supply pipe, 27 ... cutting tool, 28 ... cavity, 29 ... supply device, 30 ... mounting member, 51 ... weight, 55 ... flow path

Claims (3)

ワークに対して所定の加工を行う加工具が主軸部材に装着され、当該加工具を回転駆動させる工作機械の主軸装置であって、
前記主軸部材には、前記主軸装置の回転軸に沿って貫通穴が形成されており、当該貫通穴内に挿入され、前記加工具が所定の加工を行うときに当該加工具に潤滑冷却用の流体を供給する流体供給管と、
前記主軸装置と前記流体供給管との間に設けられ、前記流体供給管を前記主軸部材に対して回転可能に支持する軸受部材と、
前記流体供給管の両端は、前記主軸装置の回転部分に接続されており、当該接続部に設けられた、前記主軸装置の回転を減衰して前記流体供給管に伝達する回転減衰機能を有するラビリンスシールとを備え、
前記所定の加工を行うときにおける前記流体供給管の回転数は、前記主軸部材の回転数よりも少ないことを特徴とする工作機械用の主軸装置。 A spindle device of a machine tool in which a processing tool for performing predetermined processing on a workpiece is mounted on a spindle member, and the processing tool is driven to rotate,
A through hole is formed in the main shaft member along the rotation axis of the main shaft device, and the main shaft member is inserted into the through hole. When the processing tool performs a predetermined processing, a fluid for lubricating and cooling the processing tool. A fluid supply pipe for supplying
A bearing member provided between the spindle device and the fluid supply pipe, and rotatably supporting the fluid supply pipe with respect to the spindle member;
Both ends of the fluid supply pipe are connected to a rotating portion of the spindle device, and a labyrinth having a rotational damping function provided at the connection portion for attenuating the rotation of the spindle device and transmitting it to the fluid supply pipe and a seal,
A spindle device for a machine tool, wherein the rotation speed of the fluid supply pipe when performing the predetermined machining is less than the rotation speed of the spindle member. 前記流体供給管は、その外周部におもりが装着され、重量バランスに偏りが生じていることを特徴とする請求項１に記載の工作機械の主軸装置。 The fluid supply pipe, the outer peripheral portion weight is attached to the machine tool spindle device as set forth in claim 1, characterized that you have caused a bias in weight balance. 前記流体供給管は、前記潤滑冷却用の流体が流動する流動路が前記流体供給管の軸心から偏って形成され、重量バランスに偏りが生じていることを特徴とする請求項１に記載の工作機械の主軸装置。 The fluid supply tube according to claim 1 in which the fluid for the lubrication and cooling is formed biased from the axis flow path of the fluid supply tube to flow, characterized in that the deviation has occurred in the weight balance Machine tool spindle device.
JP2006142010A 2006-05-22 2006-05-22 Machine tool spindle equipment Expired - Fee Related JP4770586B2 (en)

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