JPH0235217A - Magnetic bearing spindle device - Google Patents
Magnetic bearing spindle deviceInfo
- Publication number
- JPH0235217A JPH0235217A JP18260988A JP18260988A JPH0235217A JP H0235217 A JPH0235217 A JP H0235217A JP 18260988 A JP18260988 A JP 18260988A JP 18260988 A JP18260988 A JP 18260988A JP H0235217 A JPH0235217 A JP H0235217A
- Authority
- JP
- Japan
- Prior art keywords
- spindle
- housing
- small diameter
- magnetic bearing
- diameter 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.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims description 8
- 238000000227 grinding Methods 0.000 abstract description 6
- 239000004575 stone Substances 0.000 abstract 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Landscapes
- Turning (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この考案は、内面研削スピンドル装置、ミリング用スピ
ンドル装置などの工作機械として用いられる磁気軸受ス
ピンドル装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a magnetic bearing spindle device used as a machine tool such as an internal grinding spindle device or a milling spindle device.
従来の技術
従来、磁気軸受スピンドル装置としては、ハウジング内
にスピンドルが配置され、スピンドルの一端に小径軸が
備えられ、小径軸が、ノ＼ウジングの壁に形成された孔
を通して外部に突出させられるとともにその先端に工具
が取付けられているものが知られている。BACKGROUND OF THE INVENTION Conventionally, in a magnetic bearing spindle device, a spindle is arranged in a housing, and one end of the spindle is provided with a small diameter shaft, and the small diameter shaft projects to the outside through a hole formed in the wall of a nozzing. It is also known to have a tool attached to its tip.
考案が解決しようとする課題
磁気軸受スピンドル装置には、ころがり軸受スピンドル
装置に比較して軸径を大として高剛性にすることができ
るとともに、高速回転が可能となり、しかも軸受損失も
小さくなるといううメリットがある。しかしながら、高
速回転時の風損が大きくなるとともに発熱量が大きくな
るために、損失が大きくなって必要な研削出力を得るた
めにはモータ出力をかなり大きくしなければならないと
いう問題があった。たとえば、２００Ｗの研削出力を得
るためには、１３００Ｗのモータ出力が必要であった。Problems the invention aims to solve Magnetic bearing spindle devices have the advantage of being able to have a larger shaft diameter and higher rigidity than rolling bearing spindle devices, as well as being able to rotate at higher speeds and reducing bearing loss. There are benefits. However, as the windage loss increases during high-speed rotation, the amount of heat generated also increases, resulting in increased loss and the problem that the motor output must be considerably increased in order to obtain the necessary grinding output. For example, to obtain a grinding output of 200W, a motor output of 1300W was required.
この発明の目的は、上記問題を解決し、モータ出力を従
来のものと比較して小さくすることができ、結果的に一
層の高速回転が可能となる磁気軸受スピンドル装置を提
供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic bearing spindle device that solves the above problems and can reduce motor output compared to conventional devices, resulting in higher speed rotation.
課題を解決するための手段
この発明による磁気軸受スピンドル装置は、密閉状ハウ
ジングの外部に、ハウジング内を真空にする真空排気装
置が設けられ、密閉状ハウジング内にスピンドルが配置
され、スピンドルの一端に小径軸が備えられ、小径軸が
、ハウジングの壁に形成された孔を通して外部に突出さ
せられるとともにその先端に工具が取付けられ、上記孔
と軸との間がシール装置で密封されているものである。Means for Solving the Problems A magnetic bearing spindle device according to the present invention is provided with a vacuum evacuation device for evacuating the inside of the housing on the outside of a hermetically sealed housing, a spindle disposed within the hermetically sealed housing, and a magnetic bearing spindle device at one end of the spindle. A small-diameter shaft is provided, the small-diameter shaft projects outward through a hole formed in the wall of the housing, a tool is attached to its tip, and the space between the hole and the shaft is sealed with a sealing device. be.
上記において、真空排気装置により密封状ハウジング内
を真空排気したさいのハウジング内の真空度は、０ 、
Ｉ Ｔｏｒｒ程度とすることが好ましい。In the above, when the inside of the sealed housing is evacuated by the vacuum evacuation device, the degree of vacuum inside the housing is 0,
It is preferable to set it to about I Torr.
作 用
上記のように構成された磁気軸受スピンドル装置は、真
空排気装置により密閉状ハウジング内が真空状態となさ
れて使用される。したがって、スピンドルを回転させた
さいの風損が、ハウジング内を真空にしない場合に比べ
てはるかに小さくなる。Operation The magnetic bearing spindle device configured as described above is used with the inside of the sealed housing evacuated by a vacuum evacuation device. Therefore, windage loss when rotating the spindle is much smaller than when the housing is not evacuated.
実 施 例
以下、図面を参照して、この発明の１実施例について説
明する。Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
磁気軸受スピンドル装置は、密閉状ハウジング（１）と
、密閉状ハウジング（１）内を真空排気する真空排気装
置（２）とを備えている。密閉状ハウジング（１）内に
は、公知のように、スピンドル（３）、モータ（４）、
ラジアル磁気軸受（５）、アキシャル磁気軸受（６）、
ラジアルセンザ（７）、アキンヤルセンザ（８）および
タッチダウン軸受（９）なとが配置されている。スピン
ドル（３）の左端には小径軸（１１）が備えられている
。小径軸（１１）は、ハウジング（１）の左端壁（１ａ
）に形成された孔（１２）を通して外部に突出させられ
ている。The magnetic bearing spindle device includes a sealed housing (1) and a vacuum evacuation device (2) that evacuates the inside of the sealed housing (1). Inside the closed housing (1), as is known, there are a spindle (3), a motor (4),
Radial magnetic bearing (5), axial magnetic bearing (6),
A radial sensor (7), an axis sensor (8), and a touchdown bearing (9) are arranged. A small diameter shaft (11) is provided at the left end of the spindle (3). The small diameter shaft (11) is attached to the left end wall (1a) of the housing (1).
) is made to protrude to the outside through a hole (12) formed in the hole (12).
そして、小径軸（ＩＪ）の先端に砥石などの工具（１３
）が取付けられている。たとえば小径軸（ＩＪ）の直径
は２ｍｍ程度、工具（１３）の直径は３＋ｎｍ程度とさ
れる。上記孔（１２）と小径軸（１１）との間は、ハウ
ジング（１〉の左端壁（１ａ）外面に着脱自在に取り付
けられたシール装置（１４）で密閉されている。Then, a tool such as a grindstone (13
) is installed. For example, the diameter of the small diameter shaft (IJ) is about 2 mm, and the diameter of the tool (13) is about 3+nm. The space between the hole (12) and the small diameter shaft (11) is sealed by a sealing device (14) detachably attached to the outer surface of the left end wall (1a) of the housing (1>).
シール装置（１４）は、小径軸（１１）と接する部分に
向かって徐々に薄肉となったリップ形状である。The sealing device (14) has a lip shape that gradually becomes thinner toward the portion in contact with the small diameter shaft (11).
また、シール装置（１４）としては、耐熱性、潤滑性な
どに優れたテフロン（商標、デュポン社）よりなるもの
を用いるのが好ましい。Further, as the sealing device (14), it is preferable to use one made of Teflon (trademark, DuPont), which has excellent heat resistance and lubricity.
このような磁気軸受スピンドル装置は、真空排気装置（
２）によりハウジング（１）内が真空排気されて使用さ
れる。したがって、スピンドル（３）回転時の風損は、
ハウジング（１）内を真空排気しない場合に比べてはる
かに小さくなり、モータ出力が小さくて済む。具体的に
いえば、ハウジング（１〉内の真空度が０ 、 Ｉ
Ｔｏｒｒ、小径軸（１１）の直径２ｍ川、工具（１３）
の直径３ｍｍの場合、２００Ｗの研削出力を得るために
は、モータ出力は４００Ｗで済む。Such a magnetic bearing spindle device is used in a vacuum evacuation device (
2), the inside of the housing (1) is evacuated and used. Therefore, the windage loss when the spindle (3) rotates is:
It is much smaller than the case where the inside of the housing (1) is not evacuated, and the motor output can be reduced. Specifically, if the degree of vacuum inside the housing (1) is 0, I
Torr, 2m diameter of small diameter shaft (11), tool (13)
In the case of a diameter of 3 mm, the motor output only needs to be 400 W in order to obtain a grinding output of 200 W.
また、孔（１２）と小径軸（１１）との間でシール装置
（１４）で密封されており、シール装置（１４）に接す
る小径軸（１１）の周速が小さくなるので、シル装置（
１４）の摩耗は少なく、シール装置（１４）の寿命が長
くなる。さらに、シール装置（１４）はリップ形状で柔
軟性に富むので、摩擦抵抗が小さくなり、回転を与える
ためのトルクを小さくできる。In addition, since the hole (12) and the small diameter shaft (11) are sealed by the seal device (14), the circumferential speed of the small diameter shaft (11) in contact with the seal device (14) becomes small, so the seal device (
14) is less worn, and the life of the sealing device (14) is increased. Furthermore, since the sealing device (14) has a lip shape and is highly flexible, frictional resistance is reduced, and the torque for applying rotation can be reduced.
発明の効果
この発明の磁気軸受スピンドル装置によれば、上述のよ
うに、スピンドル回転時の風損が小さくなる。その結果
、必要な研削出力を得るためのモータ出力を小さくでき
、モータの小形化を図ることが可能となる。しかも、モ
ータの小形化が可能となるので、スピンドルの長さを従
来に比べて短くできる。その結果、固有振動数を高める
ことができ、−層の高速回転が可能となる。Effects of the Invention According to the magnetic bearing spindle device of the present invention, as described above, windage loss during spindle rotation is reduced. As a result, the motor output required to obtain the necessary grinding output can be reduced, and the motor can be made smaller. Furthermore, since the motor can be made smaller, the length of the spindle can be made shorter than in the past. As a result, the natural frequency can be increased, and the - layer can be rotated at high speed.
【図面の簡単な説明】
第１図はこの発明の１実施例を示す縦断面図、第２図は
第１図の要部拡大図である。
（１）・・・密閉状ハウジング、（１ａ）・・・左端壁
、（２）・・・真空排気装置、（３）・・・スピンドル
、（１１）・・・小径軸、（１２）・・・孔、（１３）
・・・工具、（１４）・・・シール装置。
以
」ニ
特
許
出
願
人
光
洋
精
工
株
式BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, and FIG. 2 is an enlarged view of the main part of FIG. 1. (1) Sealed housing, (1a) Left end wall, (2) Vacuum exhaust device, (3) Spindle, (11) Small diameter shaft, (12) ...hole, (13)
...Tool, (14)...Sealing device. Patent applicant Koyo Seiko Co., Ltd.
Claims (1)
真空排気装置が設けられ、密閉状ハウジング内にスピン
ドルが配置され、スピンドルの一端に小径軸が備えられ
、小径軸が、ハウジングの壁に形成された孔を通して外
部に突出させられるとともにその先端に工具が取付けら
れ、上記孔と軸との間がシール装置で密封されている磁
気軸受スピンドル装置。A vacuum evacuation device is provided outside the sealed housing to evacuate the inside of the housing, a spindle is disposed within the sealed housing, a small diameter shaft is provided at one end of the spindle, and the small diameter shaft is formed on a wall of the housing. A magnetic bearing spindle device that projects outward through a hole, a tool is attached to the tip of the spindle device, and a space between the hole and the shaft is sealed with a sealing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18260988A JPH0235217A (en) | 1988-07-21 | 1988-07-21 | Magnetic bearing spindle device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18260988A JPH0235217A (en) | 1988-07-21 | 1988-07-21 | Magnetic bearing spindle device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0235217A true JPH0235217A (en) | 1990-02-05 |
Family
ID=16121282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18260988A Pending JPH0235217A (en) | 1988-07-21 | 1988-07-21 | Magnetic bearing spindle device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0235217A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH044317A (en) * | 1990-04-18 | 1992-01-08 | Matsushita Electric Ind Co Ltd | Magnetic bearing device |
| WO1995013480A1 (en) * | 1993-11-09 | 1995-05-18 | Societe De Mecanique Magnetique | Device for mounting and driving a spindle, particularly a textile spindle |
| JPH0861366A (en) * | 1994-08-25 | 1996-03-08 | Koyo Seiko Co Ltd | Magnetic bearing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57203878A (en) * | 1981-06-08 | 1982-12-14 | Toshiba Corp | Energy-accumulating flywheel apparatus |
-
1988
- 1988-07-21 JP JP18260988A patent/JPH0235217A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57203878A (en) * | 1981-06-08 | 1982-12-14 | Toshiba Corp | Energy-accumulating flywheel apparatus |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH044317A (en) * | 1990-04-18 | 1992-01-08 | Matsushita Electric Ind Co Ltd | Magnetic bearing device |
| WO1995013480A1 (en) * | 1993-11-09 | 1995-05-18 | Societe De Mecanique Magnetique | Device for mounting and driving a spindle, particularly a textile spindle |
| FR2712358A1 (en) * | 1993-11-09 | 1995-05-19 | Mecanique Magnetique Sa | Device for mounting and driving a spindle, in particular a textile spindle. |
| US5973430A (en) * | 1993-11-09 | 1999-10-26 | Societe De Mecanique Magnetique | Device for mounting and driving a spindle, particularly a textile spindle |
| JPH0861366A (en) * | 1994-08-25 | 1996-03-08 | Koyo Seiko Co Ltd | Magnetic bearing device |
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