JP2000005907A - Tool locking device for machine tool main spindle - Google Patents
Tool locking device for machine tool main spindleInfo
- Publication number
- JP2000005907A JP2000005907A JP17618198A JP17618198A JP2000005907A JP 2000005907 A JP2000005907 A JP 2000005907A JP 17618198 A JP17618198 A JP 17618198A JP 17618198 A JP17618198 A JP 17618198A JP 2000005907 A JP2000005907 A JP 2000005907A
- Authority
- JP
- Japan
- Prior art keywords
- tool
- gas
- working chamber
- draw bar
- main shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Gripping On Spindles (AREA)
Abstract
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明の属する技術分野】 本発明は、工作機械の主軸
の工具固定装置に関し、特に、工具の基端に係合するコ
レットに連係したドローバーを、圧縮ガスにより工具固
定側へ付勢するように構成したものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool fixing device for a main shaft of a machine tool, and more particularly to a draw bar associated with a collet engaged with a base end of a tool, which is biased toward a tool fixing side by compressed gas. Concerning the configured.
【0002】[0002]
【従来の技術】 ワークに切削加工等を施す工作機械の
主軸には、先端部分にテーパ状の工具保持部が形成さ
れ、工具を工具保持部に固定解除可能に固定する工具固
定装置が設けられている.一般的な工具固定装置は、工
具保持部に装着される工具の基端に係合するコレット
と、主軸内に挿通状に配設されコレットに連係したドロ
ーバーと、ドローバーを工具固定側(主軸の基端側)へ
付勢する付勢機構と、付勢機構の付勢力に抗してドロー
バーを固定解除側(主軸の先端側)へ移動可能な解除機
構等で構成されている。2. Description of the Related Art A main shaft of a machine tool that performs cutting or the like on a workpiece has a tapered tool holding portion formed at a tip end thereof, and a tool fixing device for releasably fixing a tool to the tool holding portion is provided. ing. A general tool fixing device includes a collet which engages with a base end of a tool mounted on a tool holding portion, a draw bar which is inserted in the main shaft and is linked to the collet, and a draw bar which is fixed to a tool fixing side (a main shaft of the main shaft). An urging mechanism that urges the drawbar toward the base end), a releasing mechanism that can move the drawbar to the fixing releasing side (the distal end side of the main shaft) against the urging force of the urging mechanism, and the like.
【0003】前記解除機構によりドローバーが固定解除
側へ駆動されると、コレットも固定解除側へ移動して係
合待機状態(3又は4分割されたコレットの先端部分が
開いた状態)になり、主軸の工具保持部に工具を脱着す
ることが可能になる。この状態で、工具保持部に工具を
装着するとその基端はコレットの内部側に位置し、次
に、付勢機構の付勢力によりドローバーが工具固定側へ
駆動されると、コレットも工具固定側へ移動して工具の
基端に係合し、工具はドローバーとコレットを介して作
用する前記付勢力により工具保持部に押圧されて固定さ
れ、主軸と工具はそれらの接触部に作用する摩擦力によ
り一体回転する。[0003] When the drawbar is driven by the release mechanism to the unlocking side, the collet also moves to the unlocking side and enters an engagement standby state (a state in which the tip of the collet divided into three or four is open). The tool can be attached to and detached from the tool holder of the spindle. In this state, when the tool is mounted on the tool holder, the base end is located inside the collet. Next, when the draw bar is driven to the tool fixed side by the urging force of the urging mechanism, the collet is also moved to the tool fixed side. To the base end of the tool, the tool is pressed and fixed by the tool holding portion by the urging force acting via the draw bar and the collet, and the main shaft and the tool are frictional forces acting on their contact portion. To rotate together.
【0004】ところで、従来の付勢機構は、主軸の基端
側部分に形成されたシリンダ孔に、ドローバーの基端部
に固定されピストン部材を所定ストローク移動可能に装
着し、シリンダ孔からコレット側に延びたバネ収容孔に
多数(例えば、20〜30個)の皿バネを積層状に装着
し、これら多数の皿バネの弾性力でドローバーを工具固
定側へ付勢している。工作機械の加工精度を確保する為
には、工具を工具保持部に確実に引きつけて固定し、主
軸と工具との一体回転を維持するように、固定保持部と
工具の接触部に作用する摩擦力を大きくする必要があ
る。A conventional urging mechanism mounts a piston member fixed to a base end of a draw bar to a cylinder hole formed in a base end portion of a main shaft so as to be movable by a predetermined stroke, and moves the piston member from the cylinder hole to a collet side. A large number (for example, 20 to 30) of coned disc springs are mounted in a stacked manner in the spring accommodating holes extending in the direction of the arrow, and the draw bar is urged toward the tool fixing side by the elastic force of these disc springs. In order to ensure the machining accuracy of the machine tool, the friction acting on the contact part between the fixed holding part and the tool so that the tool is firmly attracted to the tool holding part and fixed, and the main shaft and the tool keep rotating integrally with each other You need to increase your power.
【0005】[0005]
【発明が解決しようとする課題】 しかし、従来の工具
固定装置では、多数の皿バネを積層してあり、多数の皿
バネの製作誤差が累積される結果、設計通りの安定した
付勢力を発揮させることが難しく、主軸のバネ収容孔に
収容可能な皿バネの大きさにも制限があるので、ドロー
バーを安定した強力な付勢力で工具固定側へ付勢するこ
とが難しい。それ故、工具を工具保持部に強力に固定す
ることが難しく、工具に過負荷が作用したとき主軸と工
具との一体的回転を維持することも難しい。その結果、
工作機械の加工精度が十分に高めることが難しいという
問題がある。更に、多数の皿バネを装着する関係上、主
軸を含めて工具固定装置が複雑な構造になり製作コスト
が高価になる。However, in the conventional tool fixing device, a large number of disc springs are laminated, and as a result of accumulating manufacturing errors of the large number of disc springs, a stable urging force as designed is exhibited. It is difficult to perform this operation, and the size of the disc spring that can be accommodated in the spring accommodating hole of the main shaft is limited. Therefore, it is difficult to urge the drawbar toward the tool fixing side with a stable and strong urging force. Therefore, it is difficult to strongly fix the tool to the tool holding portion, and it is also difficult to maintain integral rotation between the main shaft and the tool when an overload is applied to the tool. as a result,
There is a problem that it is difficult to sufficiently increase the processing accuracy of the machine tool. Further, since a large number of disc springs are mounted, the tool fixing device including the main shaft has a complicated structure, and the manufacturing cost is high.
【0006】本発明の目的は、ドローバーを安定した非
常に大きな付勢力で工具固定側へ付勢可能にして工具を
工具保持部に確実に固定するとともに、主軸を含め簡単
な構造で製作コスト的に有利な工作機械主軸の工具固定
機構を提供することである。SUMMARY OF THE INVENTION It is an object of the present invention to enable a draw bar to be urged toward a tool fixing side with a very large urging force, thereby securely fixing a tool to a tool holding portion. It is an object of the present invention to provide a tool fixing mechanism for a machine tool spindle which is advantageous to the above.
【0007】[0007]
【課題を解決するための手段】 請求項1の工作機械主
軸の工具固定装置は、工作機械の主軸のテーパ状の工具
保持部に装着された工具を固定する為に、その工具の基
端に係合するコレットと、このコレットに連係したドロ
ーバーと、このドローバーを工具固定側へ付勢する付勢
手段と、この付勢手段の付勢力に抗してドローバーを固
定解除側へ駆動可能な解除手段とを備え、前記工具保持
部に工具を固定解除可能に固定する固定工具装置におい
て、前記付勢手段は、主軸の基端側部分に形成されたシ
リンダ孔と、シリンダ孔に所定ストローク移動可能に装
着されたピストン部を有し且つドローバーに外嵌されて
ドローバーと一体的に動くピストン部材と、シリンダ孔
のうちのピストン部に対してコレット側のガス作動室に
封入された圧縮ガスとを備えたものである。According to a first aspect of the present invention, there is provided a tool fixing device for a machine tool main spindle, wherein a tool mounted on a tapered tool holding portion of the main spindle of the machine tool is fixed to a base end of the tool. A collet to be engaged, a drawbar linked to the collet, a biasing means for biasing the drawbar toward the tool fixing side, and a release capable of driving the drawbar to the fixing release side against the biasing force of the biasing means. Means for fixing the tool to the tool holding portion so that the tool can be unlocked. In the fixed tool device, the urging means is capable of moving a predetermined stroke to a cylinder hole formed in a base end portion of the main shaft and a cylinder hole. A piston member having a piston portion mounted on the drawbar and externally fitted to the drawbar and moving integrally with the drawbar; and a compressed gas sealed in a gas working chamber on the collet side with respect to the piston portion of the cylinder hole. It is provided with.
【0008】解除手段によりドローバーが固定解除側へ
駆動された状態で、工具保持部に工具を装着すると、そ
の基端は係合待機状態(3又は4分割されたコレットの
先端部分が開いた状態)のコレットの内部側に位置し、
次に、ガス作動室に封入された圧縮ガスの付勢力によ
り、ピストン部材とともにドローバーが工具固定側へ一
体的に駆動されると、コレットも工具固定側へ移動して
工具の基端に係合し、工具はピストン部材とドローバー
とコレットとを介して作用する前記付勢力により工具保
持部に押圧されて固定される。When a tool is mounted on the tool holding portion with the draw bar being driven to the fixing releasing side by the releasing means, the base end thereof is in an engagement standby state (a state in which the distal end portion of the collet divided into three or four is open). ) Located inside the collet,
Next, when the draw bar is driven together with the piston member to the tool fixed side by the biasing force of the compressed gas sealed in the gas working chamber, the collet also moves to the tool fixed side and engages with the base end of the tool. Then, the tool is pressed and fixed to the tool holding part by the urging force acting via the piston member, the draw bar, and the collet.
【0009】この工作機械主軸の工具固定装置において
は、ガス作動室に封入された圧縮ガスによる安定した非
常に大きな付勢力で、ドローバーを工具固定側へ付勢す
ることができるため、工具を主軸の固定保持部に強力に
押圧し固定できる。ここで、ガス作動室とその外部との
間を確実にシールし、ガス作動室の圧縮ガスが外部へ殆
ど漏れないように構成することが可能である。また、工
具固定装置を長時間繰り返し使用して、ガス作動室の圧
縮ガスが外部へ漏れガス圧が低下したとしても、圧縮ガ
スをガス作動室に充填することにより、ドローバーを付
勢する付勢力を初期の大きな値に復元することが可能で
ある。In this tool fixing device for a machine tool spindle, the drawbar can be urged toward the tool fixing side with a very large and stable urging force due to the compressed gas sealed in the gas working chamber. Can be strongly pressed and fixed to the fixed holding section. Here, it is possible to reliably seal the space between the gas working chamber and the outside, and to configure the gas working chamber so that the compressed gas hardly leaks to the outside. Also, even if the compressed gas in the gas working chamber leaks to the outside and the gas pressure is reduced by repeatedly using the tool fixing device for a long time, the biasing force for biasing the draw bar by filling the gas working chamber with the compressed gas. Can be restored to the initial large value.
【0010】請求項2の工作機械主軸の工具固定装置
は、請求項1の発明において、ガス作動室はドローバー
の移動ストロークよりも軸方向に長い大きな体積の作動
室に形成されたことを特徴とするものである。それ故、
ガス作動室の圧縮ガスに対する外部へ漏れた圧縮ガスの
割合、即ち、ガス作動室内のガス圧の低下率を小さくす
ることができる。それ故、ガス作動室内のガス圧が急速
に低下するのを防止することができる。その他請求項1
と同様の作用を奏する。According to a second aspect of the present invention, there is provided a tool fixing device for a machine tool spindle according to the first aspect of the invention, wherein the gas working chamber is formed in a large volume working chamber that is longer in the axial direction than the movement stroke of the draw bar. Is what you do. Therefore,
The ratio of the compressed gas leaked to the outside relative to the compressed gas in the gas working chamber, that is, the rate of decrease in the gas pressure in the gas working chamber can be reduced. Therefore, it is possible to prevent the gas pressure in the gas working chamber from rapidly decreasing. Other claim 1
It has the same function as.
【0011】請求項3の工作機械主軸の工具固定装置
は、請求項1又は2の発明において、ガス作動室に封入
された圧縮ガスのガス圧に関連する物理量を検出するガ
ス圧検知手段を設け、ガス作動室に圧縮ガスを充填する
為のチェック弁付きのガス充填口を設けたことを特徴と
するものである。それ故、ガス圧検知手段により検出さ
れたガス作動室内のガス圧が低下している場合には、チ
ェック弁付きのガス充填口からガス作動室に圧縮ガスを
充填することができる。その他請求項1又は2と同様の
作用を奏する。According to a third aspect of the present invention, there is provided a tool fixing device for a machine tool spindle according to the first or second aspect of the present invention, further comprising a gas pressure detecting means for detecting a physical quantity related to a gas pressure of the compressed gas sealed in the gas working chamber. The gas working chamber is provided with a gas filling port with a check valve for filling compressed gas. Therefore, when the gas pressure in the gas working chamber detected by the gas pressure detecting means is low, the gas working chamber can be filled with the compressed gas from the gas filling port with the check valve. Other operations are the same as those of the first or second aspect.
【0012】請求項4の工作機械主軸の工具固定装置
は、請求項3の発明において、ガス圧検知手段は、ガス
作動室の外側において主軸の半径の変化を検出するギャ
ップセンサと、主軸の温度を検出する温度センサとを含
むことを特徴とするものである。それ故、主軸が回転し
ている間でも、ギャップセンサにより検出される主軸の
半径の変化と、温度センサにより検出される主軸の温度
に基づいて、ガス作動室内のガス圧を検出できる。その
他請求項3と同様の作用を奏する。According to a fourth aspect of the present invention, there is provided a tool fixing device for a machine tool main spindle, wherein the gas pressure detecting means includes a gap sensor for detecting a change in the radius of the main spindle outside the gas working chamber, and a temperature of the main spindle. And a temperature sensor for detecting the temperature. Therefore, even while the main shaft is rotating, the gas pressure in the gas working chamber can be detected based on the change in the radius of the main shaft detected by the gap sensor and the temperature of the main shaft detected by the temperature sensor. Other effects are the same as those of the third aspect.
【0013】請求項5の工作機械主軸の工具固定装置
は、工作機械の主軸のテーパ状の工具保持部に装着され
た工具を固定する為に、その工具の基端に係合するコレ
ットと、コレットに連係したドローバーと、ドローバー
を工具固定側へ付勢する付勢手段と、付勢手段の付勢力
に抗してドローバーを固定解除側へ駆動可能な解除手段
とを備え、前記工具保持部に工具を固定解除可能に固定
する工具固定装置において、前記付勢手段は、主軸の基
端側部分に形成されたシリンダ孔と、シリンダ孔に所定
ストローク移動可能に装着されたピストン部を有し且つ
ドローバーに外嵌されてドローバーと一体的に動くピス
トン部材と、シリンダ孔のうちのピストン部に対してコ
レット側の作動室に装着された環状の金属性のベローズ
であって圧縮ガスが封入されピストン部材を工具固定側
へ付勢するベローズとを備えたものである。According to a fifth aspect of the present invention, there is provided a tool fixing device for a machine tool spindle for fixing a tool mounted on a tapered tool holding portion of a machine tool spindle, the collet engaging with a base end of the tool. A drawbar associated with the collet, a biasing means for biasing the drawbar toward the tool fixing side, and a release means capable of driving the drawbar to the fixing release side against the biasing force of the biasing means, the tool holding unit comprising: In a tool fixing device for releasably fixing a tool to the tool, the urging means has a cylinder hole formed at a base end portion of the main shaft, and a piston portion movably mounted in the cylinder hole by a predetermined stroke. And a piston member externally fitted to the drawbar and moving integrally with the drawbar, and an annular metallic bellows mounted in the working chamber on the collet side with respect to the piston portion of the cylinder hole, and the compressed gas is provided. The entrance to the piston member is obtained by a bellows which urges the tool stationary.
【0014】解除手段によりドローバーが固定解除側へ
駆動された状態で、工具保持部に工具を装着した後、ベ
ローズに封入された圧縮ガスの付勢力により、ピストン
部材とともにドローバーが工具固定側へ一体的に駆動さ
れると、コレットも工具固定側へ移動して工具の基端に
係合し、工具はピストン部材とドローバーとコレットと
を介して作用する前記付勢力により工具保持部に押圧さ
れて固定される。この工作機械主軸の工具固定装置にお
いては、請求項1と略同様の作用を奏するが、ベローズ
内の圧縮ガスが外部へ漏れるのを極力防止することがで
きる。After the tool is mounted on the tool holding portion with the draw bar being driven to the unlocking side by the unlocking means, the draw bar is integrated with the piston member to the tool fixing side together with the piston member by the urging force of the compressed gas sealed in the bellows. When the collet is driven, the collet also moves to the tool fixed side and engages with the base end of the tool, and the tool is pressed by the tool holding portion by the urging force acting through the piston member, the draw bar, and the collet. Fixed. This tool fixing device for a machine tool spindle has substantially the same effect as the first aspect, but can prevent the compressed gas in the bellows from leaking to the outside as much as possible.
【0015】請求項6の工作機械主軸の工具固定装置
は、請求項5の発明において、前記ベローズに封入され
た圧縮ガスのガス圧に関連する物理量を検出するガス圧
検知手段を設け、ベローズに圧縮ガスを充填する為のチ
ェック弁付きのガス充填口を設けたことを特徴とするも
のである。それ故、ガス圧検知手段により検出されたガ
ス作動室内のガス圧が低下している場合には、チェック
弁付きのガス充填口からベローズに圧縮ガスを充填でき
る。その他請求項5と同様の作用を奏する。According to a sixth aspect of the present invention, there is provided a tool fixing device for a machine tool spindle according to the fifth aspect of the present invention, further comprising a gas pressure detecting means for detecting a physical quantity related to a gas pressure of the compressed gas sealed in the bellows. A gas filling port with a check valve for filling compressed gas is provided. Therefore, when the gas pressure in the gas working chamber detected by the gas pressure detecting means is low, the bellows can be filled with the compressed gas from the gas filling port with the check valve. Other operations are the same as those of the fifth aspect.
【0016】[0016]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照して説明する。本実施形態は、工作機械の
主軸の先端部の工具保持部に工具を固定解除可能に固定
する工具固定装置に、本発明を適用した場合の一例であ
る。図1〜図3に示すように、複数のベアリング1aを
介して回転自在に支持された工作機械の主軸1には、先
端部分に先端側程大径化するテーパ状の工具保持部2が
形成され、工具4を工具保持部2に固定解除可能に固定
する工具固定装置3が設けられている。Embodiments of the present invention will be described below with reference to the drawings. The present embodiment is an example of a case where the present invention is applied to a tool fixing device that releasably fixes a tool to a tool holding portion at a tip portion of a main shaft of a machine tool. As shown in FIGS. 1 to 3, a tapered tool holding portion 2 is formed at a front end portion of a main shaft 1 of a machine tool rotatably supported via a plurality of bearings 1a. In addition, a tool fixing device 3 for fixing the tool 4 to the tool holding unit 2 so as to be able to release the fixing is provided.
【0017】工具固定装置3は、工具保持部2に装着さ
れた工具4の基端の被係合部22に係合するコレット5
と、コレット5に連係したドローバー6と、ドローバー
6を工具固定側(主軸1の基端側)へ付勢する付勢機構
7と、付勢機構7の付勢力に抗してドローバー6を固定
解除側(主軸1の先端側)へ駆動可能な解除機構8等で
構成されている。The tool fixing device 3 includes a collet 5 which engages with the engaged portion 22 at the base end of the tool 4 mounted on the tool holding portion 2.
And a draw bar 6 linked to the collet 5, an urging mechanism 7 for urging the draw bar 6 toward the tool fixing side (the base end side of the main spindle 1), and a draw bar 6 fixed against the urging force of the urging mechanism 7. The release mechanism 8 and the like can be driven to the release side (the tip side of the main shaft 1).
【0018】前記主軸1には、工具保持部2と、コレッ
ト5が収容される収容孔10と、ドローバー6が挿通す
る挿通孔11と、シリンダ孔40とが、先端部から基端
側へ直列状に形成され、主軸1の先端部にはスリーブ1
3がその基端部分を外嵌螺合して固定され、主軸1の基
端部には蓋部材17が複数のボルト17aで固着されて
いる。スリーブ13の先端部分と主軸1の間には複数の
孔14が形成され、各孔14には主軸1の先端側へ先端
部を突出させた押圧部材15の基端部が摺動自在に内嵌
され、押圧部材15は孔14に装着された複数の板バネ
16で先端側へ付勢されている。但し、孔14をリング
状に形成して、複数の板バネ16をリング状に一体化し
てもよい。The main shaft 1 has a tool holding portion 2, a housing hole 10 for housing the collet 5, an insertion hole 11 through which the draw bar 6 is inserted, and a cylinder hole 40 in series from the distal end to the proximal end. The main shaft 1 is provided with a sleeve 1
The base member 3 is externally screwed and fixed, and a cover member 17 is fixed to the base end of the main shaft 1 with a plurality of bolts 17a. A plurality of holes 14 are formed between the distal end portion of the sleeve 13 and the main shaft 1, and a base end of a pressing member 15 having a distal end protruding toward the distal end of the main shaft 1 is slidably inserted into each of the holes 14. The pressing member 15 is fitted and urged toward the distal end by a plurality of leaf springs 16 mounted in the holes 14. However, the hole 14 may be formed in a ring shape, and the plurality of leaf springs 16 may be integrated in a ring shape.
【0019】前記工具4は、基端側程小径化するテーパ
軸部20と、テーパ軸部20の基端側に小径軸部21を
介して設けられた被係合部22と、テーパ軸部20の先
端側に設けられた大径の円板部23を有し、工具4を工
具保持部2に装着すると、円板部23に複数の押圧部材
15のの先端側を押圧させた状態で、テーパ軸部20が
工具保持部2に面接触し、被係合部22が収容孔10に
挿入される。The tool 4 includes a tapered shaft portion 20 having a diameter reduced toward the base end, an engaged portion 22 provided on the base end of the tapered shaft 20 via a small-diameter shaft 21, and a tapered shaft portion. 20 has a large-diameter disk portion 23 provided on the distal end side, and when the tool 4 is mounted on the tool holding portion 2, the disk portion 23 is pressed against the distal ends of the plurality of pressing members 15. Then, the tapered shaft portion 20 comes into surface contact with the tool holding portion 2, and the engaged portion 22 is inserted into the accommodation hole 10.
【0020】前記コレット5は、3又は4分割された分
割体であって、図1の係合状態から図2の係合待機状態
へ変形する弾性体であり、ドローバー6が挿通する軸孔
30と、軸孔30の先端側に設けられ軸孔30より大径
の大径孔31を有する。大径孔31にはドローバー6の
先端部に固着され係止部33が内嵌され、図2の状態か
らドローバー6が基端側へ移動すると、軸孔30と大径
孔31の境界の段部32に係止部33が係止され、コレ
ット5も基端側へ移動する。図1の状態からドローバー
6が先端側へ移動すると、コレット5は係合状態から係
合待機状態へ変形するとともにその変形を介して先端側
へ移動する。The collet 5 is a divided body divided into three or four, and is an elastic body which is deformed from the engaged state of FIG. 1 to the standby state of FIG. 2, and is provided with a shaft hole 30 through which the draw bar 6 is inserted. And a large-diameter hole 31 provided on the tip side of the shaft hole 30 and having a larger diameter than the shaft hole 30. The large-diameter hole 31 is fixed to the distal end portion of the draw bar 6 and the locking portion 33 is fitted therein. When the draw bar 6 moves to the base end side from the state of FIG. 2, a step at the boundary between the shaft hole 30 and the large-diameter hole 31 is formed. The locking portion 33 is locked to the portion 32, and the collet 5 also moves to the base end side. When the draw bar 6 moves to the distal end from the state shown in FIG. 1, the collet 5 deforms from the engaged state to the engagement standby state, and moves to the distal end through the deformation.
【0021】前記付勢機構7は、主軸1の基端側部分に
形成されたシリンダ孔40と、ドローバー6に外嵌され
且つシリンダ孔40に所定ストローク移動可能に装着さ
れピストン部42とピストン部42から先端側と基端側
に延びる筒部43,44とを有するピストン部材41を
有し、シリンダ孔40のうちのピストン部41に対して
コレット5側がガス作動室45に形成されている。ガス
作動室45はドローバー6の移動ストロークよりも軸方
向に長い大きな体積の作動室に形成され、ガス作動室4
5には所定圧の圧縮ガス(例えば、100Kg/cm2G の圧
縮窒素ガス)が封入されている。尚、ガス作動室45は
Oリング54,55等によりシールされている。The urging mechanism 7 includes a cylinder hole 40 formed at a base end portion of the main shaft 1 and a piston portion 42 and a piston portion 42 which are fitted on the draw bar 6 so as to be movable by a predetermined stroke. The gas working chamber 45 has a piston member 41 having cylindrical portions 43 and 44 extending from the 42 to the distal end side and the proximal end side, and the collet 5 side of the piston portion 41 of the cylinder hole 40. The gas working chamber 45 is formed as a large-volume working chamber that is longer in the axial direction than the movement stroke of the draw bar 6.
5 is filled with a compressed gas of a predetermined pressure (for example, compressed nitrogen gas of 100 kg / cm 2 G). The gas working chamber 45 is sealed by O-rings 54 and 55 and the like.
【0022】筒部43の先端部分は主軸1のシリンダ孔
40に連なる孔50に移動可能に内嵌され、筒部44は
蓋部材17に形成された孔51に移動可能に内嵌されて
いる。ドローバー6の基端部には主軸1の外部に臨む軸
部材53が固着され、軸部材53から解除機構8の油圧
シリンダ67の駆動力が入力される。軸部材53はドロ
ーバー6より大径に形成されており、筒部44の基端部
が軸部材53に係止されて、ガス作動室45の圧縮ガス
による付勢力がドローバー6に伝達される。The distal end of the cylindrical portion 43 is movably fitted in a hole 50 connected to the cylinder hole 40 of the main shaft 1, and the cylindrical portion 44 is movably fitted in a hole 51 formed in the lid member 17. . A shaft member 53 facing the outside of the main shaft 1 is fixed to the base end of the draw bar 6, and the driving force of the hydraulic cylinder 67 of the release mechanism 8 is input from the shaft member 53. The shaft member 53 is formed to have a larger diameter than the draw bar 6, and the base end of the cylindrical portion 44 is locked by the shaft member 53, so that the urging force of the compressed gas in the gas working chamber 45 is transmitted to the draw bar 6.
【0023】主軸1にはガス作動室45に連通するガス
通路60が形成され、このガス通路60の端部に、ガス
作動室45に圧縮ガスを充填できるチェック弁付きのガ
ス充填口61が設けられている。また、ガス作動室45
内のガス圧を検出するギャップセンサ65と温度センサ
66(例えば赤外線センサ)を含むガス圧検知手段が設
けられている。ギャップセンサ65と温度センサ66
は、主軸1のうちのガス作動室45に対応する部分の外
周面に臨むように固定的に設けられ、ギャップセンサ6
5により求めた主軸1の半径の変化と、温度センサ66
により求めた主軸1の温度に基づいて、ガス作動室45
内のガス圧を測定できる。A gas passage 60 communicating with the gas working chamber 45 is formed in the main shaft 1, and a gas filling port 61 with a check valve for filling the gas working chamber 45 with a compressed gas is provided at an end of the gas passage 60. Have been. Also, the gas working chamber 45
Gas pressure detecting means including a gap sensor 65 for detecting the gas pressure in the inside and a temperature sensor 66 (for example, an infrared sensor) is provided. Gap sensor 65 and temperature sensor 66
Is fixedly provided so as to face an outer peripheral surface of a portion of the main shaft 1 corresponding to the gas working chamber 45, and the gap sensor 6 is provided.
5, the change in the radius of the main shaft 1 and the temperature sensor 66
Gas working chamber 45 based on the temperature of the spindle 1 obtained by
The gas pressure inside can be measured.
【0024】前記解除機構8は、主軸1の基端側に固定
的に設けられ、油圧供給源を含む駆動制御部により駆動
制御される油圧シリンダ67を有し、ピストンロッド6
7aの先端部でドローバー6の基端部の軸部材53を押
動し、ドローバー6を固定解除側へ駆動するように構成
してある。The release mechanism 8 has a hydraulic cylinder 67 fixedly provided on the base end side of the main shaft 1 and driven and controlled by a drive control section including a hydraulic supply source.
A shaft member 53 at the base end of the draw bar 6 is pushed by the distal end of the draw bar 7a, and the draw bar 6 is driven to the unlocking side.
【0025】工具固定装置3の作用・効果について説明
する。図1の状態から、解除機構8によりドローバー6
が固定解除側へ駆動されると、図2に示すように、コレ
ット5が固定解除側へ移動して係合待機状態(3又は4
分割されたコレット5の先端部分が開いた状態)にな
り、工具保持部2に工具4を着脱することが可能にな
る。The operation and effect of the tool fixing device 3 will be described. 1 from the state of FIG.
Is driven to the unlocking side, as shown in FIG. 2, the collet 5 moves to the unlocking side and waits for the engagement (3 or 4).
In this state, the divided collet 5 is in an open state, and the tool 4 can be attached to and detached from the tool holder 2.
【0026】この状態で、工具保持部2に工具4を装着
すると工具4の被係合部22がコレット5の内部側に位
置し、次に、解除機構8の油圧シリンダ67のピストン
ロッド67aを退入させると、ガス作動室45に封入さ
れた圧縮ガスの付勢力により、ピストン部材41ととも
にドローバー6が工具固定側へ一体的に移動して、図1
に示すように、コレット5も工具固定側へ移動して工具
4の被係合部22に係合し、工具4はピストン部材41
とドローバー6とコレット5とを介して作用する前記付
勢力により工具保持部2に押圧されて固定される。In this state, when the tool 4 is mounted on the tool holder 2, the engaged portion 22 of the tool 4 is located inside the collet 5, and then the piston rod 67a of the hydraulic cylinder 67 of the release mechanism 8 is moved. When retracted, the urging force of the compressed gas sealed in the gas working chamber 45 causes the draw bar 6 to move integrally with the piston member 41 to the tool fixing side together with the piston member 41, and FIG.
As shown in the figure, the collet 5 also moves to the tool fixing side and engages with the engaged portion 22 of the tool 4, and the tool 4
And the tool bar 2 is pressed and fixed by the urging force acting via the draw bar 6 and the collet 5.
【0027】工具固定装置3によれば、付勢機構7のガ
ス作動室45に封入された圧縮ガスにより、安定した非
常に大きな付勢力でドローバー6を工具固定側へ付勢す
ることが可能になる。また、工具固定装置3を長期間繰
り返し使用してガス作動室45の圧縮ガスが外部へ漏れ
ガス圧が低下したとしても、圧縮ガスをチェック弁付き
のガス充填口61からガス作動室45に充填することに
より、ドローバー6を付勢する付勢力を初期の大きな値
に復元することが可能になる。According to the tool fixing device 3, the draw bar 6 can be urged toward the tool fixing side with a very large urging force by the compressed gas sealed in the gas working chamber 45 of the urging mechanism 7. Become. Even if the compressed gas in the gas working chamber 45 leaks to the outside and the gas pressure drops due to repeated use of the tool fixing device 3 for a long time, the compressed gas is filled into the gas working chamber 45 from the gas filling port 61 with a check valve. By doing so, the urging force for urging the drawbar 6 can be restored to the initial large value.
【0028】それ故、工具4を工具保持部2に強力に押
圧し固定することができるため、固定保持部2と工具4
のテーパ部29との間に作用する摩擦力が非常に大きく
なり、工具4に過負荷が作用しても主軸1と工具4との
一体的回転を維持でき、工作機械の加工精度を確実に高
めることができる。しかも、主軸1を含めて工具固定装
置3が可能な構造になり製作コストを低減することがで
きる。Therefore, since the tool 4 can be strongly pressed and fixed to the tool holding portion 2, the fixed holding portion 2 and the tool 4
The frictional force acting between the main shaft 1 and the tapered portion 29 becomes extremely large, and even if an overload is applied to the tool 4, the integrated rotation of the main spindle 1 and the tool 4 can be maintained. Can be enhanced. In addition, the tool fixing device 3 including the main shaft 1 can be configured so that the manufacturing cost can be reduced.
【0029】ガス作動室45をドローバー6の移動スト
ロークよりも軸方向に長い大きな体積の作動室に形成し
たので、ガス作動室45の圧縮ガスに対する外部へ漏れ
た圧縮ガスの割合、即ち、ガス作動室45内のガス圧の
低下率を小さくすることができる。それ故、ガス作動室
45内のガス圧が急速に低下するのを防止できる。ガス
作動室45の外側において主軸1の半径の変化を検出す
るギャップセンサ65と、主軸1の温度を検出する温度
センサ66とを設けるので、主軸1が回転している間で
も、ギャップセンサ65により検出される主軸の半径の
変化と、温度センサ66により検出される主軸の温度に
基づいて、ガス作動室45内のガス圧を検出することが
できる。Since the gas working chamber 45 is formed as a large volume working chamber which is longer in the axial direction than the movement stroke of the draw bar 6, the ratio of the compressed gas leaked to the outside to the compressed gas in the gas working chamber 45, that is, the gas working The rate of decrease in the gas pressure in the chamber 45 can be reduced. Therefore, it is possible to prevent the gas pressure in the gas working chamber 45 from rapidly decreasing. Since the gap sensor 65 for detecting a change in the radius of the main shaft 1 and the temperature sensor 66 for detecting the temperature of the main shaft 1 are provided outside the gas working chamber 45, even when the main shaft 1 is rotating, the gap sensor 65 is used. The gas pressure in the gas working chamber 45 can be detected based on the detected change in the radius of the main shaft and the temperature of the main shaft detected by the temperature sensor 66.
【0030】次に、前記実施形態の別実施形態について
図4を参照して説明する。別実施形態は、前記実施形態
の付勢機構7を変更したものであり、前記実施形態と同
じものには同一符号を付して説明を省略する。Next, another embodiment of the above embodiment will be described with reference to FIG. In another embodiment, the urging mechanism 7 of the above embodiment is changed, and the same components as those of the above embodiment are denoted by the same reference numerals and description thereof is omitted.
【0031】工具固定装置3Aの付勢機構7Aは、ガス
作動室45にピストン部材41の筒部43が挿通する環
状のステンレス製のベローズ70を装着したものであ
り、このベローズ70に圧縮ガスが封入されている。ピ
ストン部材41の筒部44Aと蓋部材17の孔51Aと
ドローバー6の基端部に固着された軸部材53Aは、前
記実施形態と比べてやや大径に形成され、ピストン部材
41のピストン部42と筒部44Aに、ベローズ70の
内部に連通するガス通路71が形成され、このガス通路
71の端部に、ベローズ70に圧縮ガスを充填できるチ
ェック弁付きのガス充填口72が設けられている。The biasing mechanism 7A of the tool fixing device 3A has a gas operating chamber 45 fitted with an annular stainless steel bellows 70 through which the cylindrical portion 43 of the piston member 41 is inserted. It is enclosed. The cylindrical member 44A of the piston member 41, the hole 51A of the lid member 17, and the shaft member 53A fixed to the base end of the draw bar 6 are formed to have a slightly larger diameter as compared with the above-described embodiment. A gas passage 71 communicating with the inside of the bellows 70 is formed in the bellows 70 and the cylindrical portion 44A, and a gas filling port 72 with a check valve for filling the bellows 70 with a compressed gas is provided at an end of the gas passage 71. .
【0032】ベローズ70とガス通路71から圧縮ガス
が漏れないようする為、ベローズ70の基端面とピスト
ン部42の先端面とは強力に接着され、ベローズ70と
ガス通路71の接続部近傍にはシール74が装着されて
いる。また、筒部44Aにはガス充填口72を開閉可能
に閉じる封止プラグ73が螺着されている。ベローズ7
0をガス作動室45内に組付けてから、ガス充填口72
から圧縮ガスを充填できるため、ベローズ70を容易に
組付けることができる。In order to prevent the compressed gas from leaking from the bellows 70 and the gas passage 71, the base end surface of the bellows 70 and the distal end surface of the piston portion 42 are strongly bonded. A seal 74 is provided. A sealing plug 73 that closes the gas filling port 72 so as to be openable and closable is screwed to the cylindrical portion 44A. Bellows 7
0 in the gas working chamber 45 and then the gas filling port 72
The bellows 70 can be easily assembled because the compressed gas can be filled from the inside.
【0033】コレット5が固定解除側へ移動した状態
で、主軸1の工具保持部2に工具4を装着した後、ベロ
ーズ70に封入された圧縮ガスの付勢力により、ピスト
ン部材41とともにドローバー6が工具固定側へ一体的
に駆動されると、コレット5も工具固定側へ移動して工
具の基端に係合し、工具4は前記付勢力により工具保持
部2に押圧されて固定される。この工具固定装置3Aに
よれば、前記実施形態と略同様の作用・効果を奏する
が、圧縮ガスをベローズ70に封入したので、その圧縮
ガスが外部へ漏れるのを極力防止することができる。After the tool 4 is mounted on the tool holder 2 of the main spindle 1 with the collet 5 moved to the unlocking side, the draw bar 6 is moved together with the piston member 41 by the urging force of the compressed gas sealed in the bellows 70. When integrally driven to the tool fixing side, the collet 5 also moves to the tool fixing side and engages with the base end of the tool, and the tool 4 is pressed and fixed by the tool holding portion 2 by the urging force. According to the tool fixing device 3A, substantially the same operation and effect as those of the above embodiment can be obtained, but since the compressed gas is sealed in the bellows 70, the compressed gas can be prevented from leaking to the outside as much as possible.
【0034】尚、前記実施形態の解除機構8、ギャップ
センサ65、温度センサ66は図示省略している。但
し、ギャップセンサ65は、主軸1の基端側に固定的に
設けられ、主軸の長さの変化を検出し、ベローズ70内
のガス圧を検出できるように構成してある。The release mechanism 8, the gap sensor 65, and the temperature sensor 66 of the above embodiment are not shown. However, the gap sensor 65 is fixedly provided on the base end side of the main shaft 1, and is configured to detect a change in the length of the main shaft and to detect the gas pressure in the bellows 70.
【0035】尚、図示していないが、前記メイン実施形
態において、前記実施形態のガス作動室45の代わり
に、ガス作動室45より軸方向に短い(但し、ドローバ
ー6の移動ストローク以上ある)小さなガス作動室を設
けてもよい。この場合、ガス作動室から圧縮ガスが漏れ
ないように、ガス作動室45のシール性能を向上させる
ことが望ましい。また、別実施形態においても、ガス作
動室45より軸方向に短い作動室を設け、この作動室内
に軸方向にベローズを設けてもよい。Although not shown, in the main embodiment, instead of the gas working chamber 45 of the above-described embodiment, the gas working chamber 45 is smaller than the gas working chamber 45 in the axial direction (however, it is longer than the movement stroke of the draw bar 6). A gas working chamber may be provided. In this case, it is desirable to improve the sealing performance of the gas working chamber 45 so that the compressed gas does not leak from the gas working chamber. In another embodiment, a working chamber that is shorter in the axial direction than the gas working chamber 45 may be provided, and a bellows may be provided in the working chamber in the axial direction.
【0036】別実施形態において、圧縮ガスが封入され
たベローズ70をガス作動室45内に組付けてもよい。
この場合、ピストン部材41のガス通路71、チェック
弁付きのガス充填口72、封止プラグ73、シール74
等を省略できるため、ピストン部材を非常に簡単な構造
になるとともに、ベローズ70の圧縮ガスが外部へ漏れ
るのを確実に防止することができる。In another embodiment, a bellows 70 filled with compressed gas may be assembled in the gas working chamber 45.
In this case, the gas passage 71 of the piston member 41, the gas filling port 72 with a check valve, the sealing plug 73, the seal 74
Since the piston member can be omitted, the piston member has a very simple structure, and the compressed gas of the bellows 70 can be reliably prevented from leaking to the outside.
【0037】[0037]
【発明の効果】 請求項1の工作機械主軸の工具固定装
置によれば、ガス作動室に封入された圧縮ガスによる安
定した非常に大きな付勢力で、ドローバーを工具固定側
へ付勢することができるため、工具を主軸の固定保持部
に強力に押圧し固定することができ、固定保持部と工具
と接触部に作用する摩擦力が非常に大きくなり、工具に
過負荷が作用しても主軸と工具との一体的回転を維持で
き、工作機械の加工精度を確実に高めることができ、し
かも、主軸を含めて工具固定装置が簡単な構造になり製
作コストを低減できる。According to the tool fixing device for a machine tool spindle according to the first aspect, the drawbar can be urged toward the tool fixing side with a very large and stable urging force caused by the compressed gas sealed in the gas working chamber. The tool can be strongly pressed and fixed to the fixed holding part of the main spindle, and the frictional force acting on the fixed holding part, the tool and the contact part becomes very large. The rotation of the tool and the tool can be maintained integrally, the machining accuracy of the machine tool can be reliably increased, and the tool fixing device including the main shaft has a simple structure, so that the manufacturing cost can be reduced.
【0038】請求項2の工作機械主軸の工具固定装置に
よれば、請求項1と同様の効果を奏するが、ガス作動室
をドローバーの移動ストロークよりも軸方向に長い大き
な体積の作動室に形成したので、ガス作動室に封入され
ている圧縮ガスに対する外部へ漏れた圧縮ガスの場合、
即ち、ガス作動室のガス圧の低下率を小さくすることが
でき、ガス作動室のガス圧が急速に低下するのを防止す
ることができる。According to the tool fixing device for a machine tool spindle of the second aspect, the same effect as that of the first aspect is obtained, but the gas working chamber is formed in a large volume working chamber that is longer in the axial direction than the movement stroke of the draw bar. Therefore, in the case of compressed gas leaked to the outside of the compressed gas sealed in the gas working chamber,
That is, the rate of decrease in the gas pressure in the gas working chamber can be reduced, and the gas pressure in the gas working chamber can be prevented from rapidly decreasing.
【0039】請求項3の工作機械主軸の工具固定装置に
よれば、請求項1又は2と同様の効果を奏するが、ガス
作動室に封入された圧縮ガスのガス圧に関連する物理量
を検出するガス圧検知手段を設け、ガス作動室に圧縮ガ
スを充填する為のチェック弁付きのガス充填口を設けた
ので、ガス圧検知手段により検出された前記ガス圧が低
下している場合には、チェック弁付きのガス充填口から
ガス作動室に圧縮ガスを充填することができる。According to the third aspect of the present invention, the same effect as in the first or second aspect is obtained, but a physical quantity related to the gas pressure of the compressed gas sealed in the gas working chamber is detected. Since the gas pressure detecting means is provided, and the gas working chamber is provided with a gas filling port with a check valve for filling the compressed gas, when the gas pressure detected by the gas pressure detecting means is reduced, The gas working chamber can be filled with the compressed gas from the gas filling port with the check valve.
【0040】請求項4の工作機械主軸の工具固定装置に
よれば、請求項3と同様の効果を奏するが、ガス圧検知
手段は、ガス作動室の外側において主軸の半径の変化を
検出するギャップセンサと、主軸の温度を検出する温度
センサとを含むので、主軸が回転している間でも、ギャ
ップセンサにより検出される主軸の半径の変化と、温度
センサにより検出される主軸の温度に基づいて、ガス作
動室の圧縮ガスのガス圧を検出できる。According to the tool fixing device for a machine tool spindle of the fourth aspect, the same effect as that of the third aspect is obtained, but the gas pressure detecting means detects a change in the radius of the spindle outside the gas working chamber. Since the sensor and the temperature sensor for detecting the temperature of the main shaft are included, even while the main shaft is rotating, based on the change in the radius of the main shaft detected by the gap sensor and the temperature of the main shaft detected by the temperature sensor, The gas pressure of the compressed gas in the gas working chamber can be detected.
【0041】請求項5の工作機械主軸の工具固定装置に
よれば、請求項1と同様に、ベローズに封入された圧縮
ガスによる安定した非常に大きな付勢力で、ドローバー
を工具固定側へ付勢することができるため、工具を主軸
の固定保持部に強力に押圧し固定することができ、固定
保持部と工具と接触部に作用する摩擦力が非常に大きく
なり、工具に過負荷が作用しても主軸と工具との一体的
回転を維持でき、工作機械の加工精度を確実に高めるこ
とができる他、圧縮ガスをベローズに封入したので、そ
の圧縮ガスが外部へ漏れるのを極力防止することができ
る。According to the fifth aspect of the present invention, similarly to the first aspect, the draw bar is urged toward the tool fixing side with a very large urging force stabilized by the compressed gas sealed in the bellows. The tool can be strongly pressed and fixed to the fixed holding part of the spindle, the frictional force acting on the fixed holding part, the tool and the contact part becomes very large, and the tool is overloaded. In addition to maintaining the integral rotation of the spindle and the tool, the machining accuracy of the machine tool can be reliably increased, and the compressed gas is sealed in the bellows to minimize the leakage of the compressed gas to the outside. Can be.
【0042】請求項6の工作機械主軸の工具固定装置に
よれば、請求項5と同様の効果を奏するが、ベローズに
封入された圧縮ガスのガス圧に関連する物理量を検出す
るガス圧検知手段を設け、ベローズに圧縮ガスを充填す
る為のチェック弁付きのガス充填口を設けたので、ガス
圧検知手段により検出された前記ガス圧が低下している
場合には、チェック弁付きのガス充填口からガス作動室
に圧縮ガスを充填することができる。According to the tool fixing device for a machine tool spindle of the sixth aspect, the same effect as the fifth aspect is obtained, but a gas pressure detecting means for detecting a physical quantity related to the gas pressure of the compressed gas sealed in the bellows. The bellows is provided with a gas filling port with a check valve for filling the compressed gas, so if the gas pressure detected by the gas pressure detecting means is low, the gas filling with a check valve is provided. The gas working chamber can be filled with compressed gas through the mouth.
【図1】本発明の実施形態に係る工作機械の主軸と工具
固定装置の縦断面図である。FIG. 1 is a longitudinal sectional view of a spindle and a tool fixing device of a machine tool according to an embodiment of the present invention.
【図2】前記主軸と工具固定装置(工具取外し状態)の
縦断面図である。FIG. 2 is a longitudinal sectional view of the spindle and a tool fixing device (tool removal state).
【図3】前記主軸と工具固定装置の要部拡大断面図であ
る。FIG. 3 is an enlarged sectional view of a main part of the spindle and the tool fixing device.
【図4】別実施形態の工具固定装置の要部拡大縦断面図
である。FIG. 4 is an enlarged longitudinal sectional view of a main part of a tool fixing device according to another embodiment.
1 主軸 2 工具保持部 3,3A 工具固定装置 4 工具 5 コレット 6 ドローバー 7,7A 付勢機構 8 解除機構 40 シリンダ孔 41 ピストン部材 42 ピストン部 45 ガス作動室 61,72 ガス充填口 65 ギャップセンサ 66 温度センサ 70 ベローズ DESCRIPTION OF SYMBOLS 1 Main shaft 2 Tool holding part 3, 3A Tool fixing device 4 Tool 5 Collet 6 Drawbar 7, 7A Urging mechanism 8 Release mechanism 40 Cylinder hole 41 Piston member 42 Piston part 45 Gas working chamber 61, 72 Gas filling port 65 Gap sensor 66 Temperature sensor 70 bellows
Claims (6)
に装着された工具を固定する為に、その工具の基端に係
合するコレットと、このコレットに連係したドローバー
と、このドローバーを工具固定側へ付勢する付勢手段
と、この付勢手段の付勢力に抗してドローバーを固定解
除側へ駆動可能な解除手段とを備え、前記工具保持部に
工具を固定解除可能に固定する工具固定装置において、 前記付勢手段は、主軸の基端側部分に形成されたシリン
ダ孔と、シリンダ孔に所定ストローク移動可能に装着さ
れたピストン部を有し且つドローバーに外嵌されてドロ
ーバーと一体的に動くピストン部材と、シリンダ孔のう
ちのピストン部に対してコレット側のガス作動室に封入
された圧縮ガスとを備えたことを特徴とする工作機械主
軸の工具固定装置。To fix a tool mounted on a tapered tool holding portion of a main shaft of a machine tool, a collet engaged with a base end of the tool, a draw bar associated with the collet, and a draw bar are provided. An urging means for urging the tool to the fixing side, and a releasing means for driving the draw bar to the fixing releasing side against the urging force of the urging means are provided, and the tool is releasably fixed to the tool holding portion. The urging means has a cylinder hole formed at a base end side portion of the main shaft, a piston portion attached to the cylinder hole so as to be movable by a predetermined stroke, and is externally fitted to a draw bar to A tool fixing device for a machine tool spindle, comprising: a piston member that moves integrally with the piston; and a compressed gas sealed in a gas working chamber on the collet side with respect to the piston portion of the cylinder hole.
ロークよりも軸方向に長い大きな体積の作動室に形成さ
れたことを特徴とする請求項1に記載の工作機械主軸の
工具固定装置。2. The tool fixing device according to claim 1, wherein the gas working chamber is formed in a large-sized working chamber that is longer in the axial direction than a movement stroke of the draw bar.
ガス圧に関連する物理量を検出するガス圧検知手段を設
け、ガス作動室に圧縮ガスを充填する為のチェック弁付
きのガス充填口を設けたことを特徴とする請求項1また
は2に記載の工作機械主軸の工具固定装置。3. A gas filling port with a check valve for filling the gas working chamber with the compressed gas, the gas working chamber being provided with gas pressure detecting means for detecting a physical quantity related to the gas pressure of the compressed gas sealed in the gas working chamber. The tool fixing device for a machine tool spindle according to claim 1 or 2, further comprising:
側において主軸の半径の変化を検出するギャップセンサ
と、主軸の温度を検出する温度センサとを含むことを特
徴とする請求項3に記載の工作機械主軸の工具固定装
置。4. The apparatus according to claim 3, wherein said gas pressure detecting means includes a gap sensor for detecting a change in radius of the main shaft outside the gas working chamber, and a temperature sensor for detecting a temperature of the main shaft. A tool fixing device for a machine tool spindle according to the above.
に装着された工具を固定する為に、その工具の基端に係
合するコレットと、このコレットに連係したドローバー
と、このドローバーを工具固定側へ付勢する付勢手段
と、この付勢手段の付勢力に抗してドローバーを固定解
除側へ駆動可能な解除手段とを備え、前記工具保持部に
工具を固定解除可能に固定する工具固定装置において、 前記付勢手段は、主軸の基端側部分に形成されたシリン
ダ孔と、シリンダ孔に所定ストローク移動可能に装着さ
れたピストン部を有し且つドローバーに外嵌されてドロ
ーバーと一体的に動くピストン部材と、シリンダ孔のう
ちのピストン部に対してコレット側の作動室に装着され
た環状の金属性のベローズであって圧縮ガスが封入され
ピストン部材を工具固定側へ付勢するベローズとを備え
たことを特徴とする工作基端主軸の工具固定装置。5. A collet engaged with a base end of a tool mounted on a tapered tool holding portion of a main shaft of a machine tool, a draw bar linked to the collet, and a draw bar connected to the collet. An urging means for urging the tool to the fixing side, and a releasing means for driving the draw bar to the fixing releasing side against the urging force of the urging means are provided, and the tool is releasably fixed to the tool holding portion. The urging means has a cylinder hole formed at a base end side portion of the main shaft, a piston portion attached to the cylinder hole so as to be movable by a predetermined stroke, and is externally fitted to a draw bar to A piston member that moves integrally with the piston member, and a ring-shaped metallic bellows mounted in the working chamber on the collet side with respect to the piston portion of the cylinder hole. Tool fixing device for machine tools proximal main shaft, characterized in that a bellows which urges constant side.
ス圧に関連する物理量を検出するガス圧検知手段を設
け、ベローズに圧縮ガスを充填する為のチェック弁付き
のガス充填口を設けたことを特徴とする請求項5に記載
の工作機械主軸の工具固定装置。6. A gas pressure detecting means for detecting a physical quantity related to a gas pressure of the compressed gas sealed in the bellows, and a gas filling port with a check valve for filling the bellows with the compressed gas is provided. The tool fixing device for a machine tool spindle according to claim 5, characterized in that:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17618198A JP4079517B2 (en) | 1998-06-23 | 1998-06-23 | Tool fixing device for machine tool spindle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17618198A JP4079517B2 (en) | 1998-06-23 | 1998-06-23 | Tool fixing device for machine tool spindle |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000005907A true JP2000005907A (en) | 2000-01-11 |
JP4079517B2 JP4079517B2 (en) | 2008-04-23 |
Family
ID=16009080
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17618198A Expired - Fee Related JP4079517B2 (en) | 1998-06-23 | 1998-06-23 | Tool fixing device for machine tool spindle |
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Country | Link |
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JP (1) | JP4079517B2 (en) |
Cited By (9)
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WO2001065137A1 (en) * | 2000-03-03 | 2001-09-07 | Pascal Kabushiki Kaisha | Hydraulic cylinder with boosting function |
JP2001246507A (en) * | 2000-03-23 | 2001-09-11 | Pascal Kk | Tool fixing device for main spindle of machine tool |
WO2001075327A1 (en) * | 2000-03-31 | 2001-10-11 | Pascal Kabushiki Kaisha | Gas spring and method of charging gas into the gas spring |
JP2002310212A (en) * | 2001-04-11 | 2002-10-23 | Pascal Corp | Gas spring and method of filling the same with gas |
WO2002088570A1 (en) * | 2001-04-11 | 2002-11-07 | Pascal Engineering Corporation | Gas spring |
US6722827B1 (en) * | 1999-03-23 | 2004-04-20 | Sandvik Aktiebolag | Tool clamping device employing gas spring |
WO2004041465A1 (en) * | 2002-11-05 | 2004-05-21 | Pascal Engineering Corporation | Tool fixing device of machine tool spindle |
US7287941B1 (en) * | 2006-09-05 | 2007-10-30 | Kennametal Inc. | Apparatus for amplifying the pull back force on a lock rod used to secure a toolholder |
CN103465047A (en) * | 2013-08-15 | 2013-12-25 | 烟台海德汽车零部件有限责任公司 | Spring assembly for broaching during machining of central main shaft |
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1998
- 1998-06-23 JP JP17618198A patent/JP4079517B2/en not_active Expired - Fee Related
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US6722827B1 (en) * | 1999-03-23 | 2004-04-20 | Sandvik Aktiebolag | Tool clamping device employing gas spring |
JP2001248676A (en) * | 2000-03-03 | 2001-09-14 | Pascal Kk | Hydraulic cylinder with pressure intensifying function |
WO2001065137A1 (en) * | 2000-03-03 | 2001-09-07 | Pascal Kabushiki Kaisha | Hydraulic cylinder with boosting function |
JP2001246507A (en) * | 2000-03-23 | 2001-09-11 | Pascal Kk | Tool fixing device for main spindle of machine tool |
US6663088B2 (en) * | 2000-03-31 | 2003-12-16 | Pascal Engineering Corporation | Gas spring and method of charging gas into the gas spring |
WO2001075327A1 (en) * | 2000-03-31 | 2001-10-11 | Pascal Kabushiki Kaisha | Gas spring and method of charging gas into the gas spring |
JP2002310212A (en) * | 2001-04-11 | 2002-10-23 | Pascal Corp | Gas spring and method of filling the same with gas |
WO2002088570A1 (en) * | 2001-04-11 | 2002-11-07 | Pascal Engineering Corporation | Gas spring |
WO2002084141A1 (en) * | 2001-04-11 | 2002-10-24 | Pascal Engineering Corporation | Gas spring |
US7021609B2 (en) | 2001-04-11 | 2006-04-04 | Pascal Engineering Corporation | Gas spring |
US7222702B2 (en) | 2001-04-11 | 2007-05-29 | Pascal Engineering Corporation | Gas spring |
JP4663901B2 (en) * | 2001-04-11 | 2011-04-06 | パスカルエンジニアリング株式会社 | Gas spring and gas filling method thereof |
WO2004041465A1 (en) * | 2002-11-05 | 2004-05-21 | Pascal Engineering Corporation | Tool fixing device of machine tool spindle |
US7287941B1 (en) * | 2006-09-05 | 2007-10-30 | Kennametal Inc. | Apparatus for amplifying the pull back force on a lock rod used to secure a toolholder |
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CN103465047A (en) * | 2013-08-15 | 2013-12-25 | 烟台海德汽车零部件有限责任公司 | Spring assembly for broaching during machining of central main shaft |
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