JPH0166902U

JPH0166902U -

Info

Publication number: JPH0166902U
Application number: JP1987163313U
Authority: JP
Priority date: 1987-10-26
Filing date: 1987-10-26
Publication date: 1989-04-28

Description

[Brief explanation of drawings]

第１〜４図は本考案による磁気軸受スピンドル
の第１実施例を示す図であり、第１図はその全体
構成図、第２図は振動軽減手段の拡大断面図、第
３図は振動軽減手段の模式図、第４図は本考案の
効果を示す振動レベルと周波数との関係図、第５
図は本考案の第２実施例を示す振動軽減手段の拡
大断面図、第６図は本考案の第３実施例を示す振
動軽減手段の拡大断面図、第７図は本考案の第４
実施例を示す振動軽減手段の拡大断面図、第８図
は粘弾性体の他の構成例を示す拡大断面図、第９
図は他の種のダイナミツクダンパの模式図、第１
０図は第９図に示すダイナミツクダンパの効果を
示す振動レベルと周波数との関係図である。１……磁気軸受加工装置、２……本体、３……
回転スピンドル（磁気軸受スピンドル）、３ａ…
…段部、３ｂ，３ｃ……小径部、３ｄ……軸穴、
５，６……ラジアル電磁石（磁気軸受）、８……
モータ、１０……フランジ部、１１，１２……ア
キシヤル電磁石（磁気軸受）、１４，１５，１６
……変位センサ、１８，１９……保護ベアリング
、２１……砥石、２２……Ｏリング（粘弾性体）
、２４，３４〜３７……質量体、２４ａ……大径
部、２４ｂ……凸部、２４ｃ……割り溝、２４ｄ
……ネジ軸、２５，２６，２７，２８……振動軽
減手段、３４ａ……頭部、３５ａ……メネジ部、
３８……蓋部材、４０……ゴム部材（粘弾性体）
、４１……ゴム材料（粘弾性体）。 1 to 4 are diagrams showing a first embodiment of the magnetic bearing spindle according to the present invention, in which FIG. 1 is an overall configuration diagram thereof, FIG. 2 is an enlarged sectional view of a vibration reducing means, and FIG. 3 is a vibration reducing means. A schematic diagram of the means, Figure 4 is a relationship diagram between vibration level and frequency showing the effect of the present invention, and Figure 5 is a diagram of the relationship between vibration level and frequency.
The figure is an enlarged cross-sectional view of the vibration reducing means showing the second embodiment of the present invention, FIG. 6 is an enlarged cross-sectional view of the vibration reducing means showing the third embodiment of the present invention, and FIG. 7 is the fourth embodiment of the present invention.
FIG. 8 is an enlarged sectional view of a vibration reducing means showing an example; FIG. 8 is an enlarged sectional view showing another example of the structure of the viscoelastic body;
The figure is a schematic diagram of another type of dynamic damper, No. 1.
FIG. 0 is a relationship diagram between vibration level and frequency showing the effect of the dynamic damper shown in FIG. 9. 1...Magnetic bearing processing device, 2...Main body, 3...
Rotating spindle (magnetic bearing spindle), 3a...
...Stepped part, 3b, 3c...Small diameter part, 3d...Shaft hole,
5, 6...Radial electromagnet (magnetic bearing), 8...
Motor, 10...Flange part, 11, 12...Axial electromagnet (magnetic bearing), 14, 15, 16
... Displacement sensor, 18, 19 ... Protective bearing, 21 ... Grinding wheel, 22 ... O ring (viscoelastic body)
, 24, 34-37... Mass body, 24a... Large diameter portion, 24b... Convex portion, 24c... Division groove, 24d
...Screw shaft, 25, 26, 27, 28...Vibration reduction means, 34a...Head, 35a...Female screw part,
38...Lid member, 40...Rubber member (viscoelastic body)
, 41...Rubber material (viscoelastic body).

Claims

[Claims for Utility Model Registration] (1) A magnetic bearing device equipped with a magnetic bearing that magnetically levitates and supports a rotating spindle, characterized in that a vibration reducing means is provided inside the rotating spindle. spindle. (2) The vibration reducing means is characterized in that a shaft hole is formed at the end of the rotating spindle, and a mass body is incorporated into the shaft hole via a viscoelastic body. Magnetic bearing spindle as described in section. (3) The magnetic bearing spindle according to claim 2, wherein the vibration reducing means is configured such that the viscoelastic body and the mass body are replaceable. (4) The magnetism according to claim 2 or 3 of the utility model registration claim, characterized in that a gap between the inner circumferential surface of the shaft hole and the outer circumferential surface of the mass body is 0.02 mm or less. bearing spindle. (5) The magnetic bearing spindle according to any one of claims 2 to 4, wherein the mass body is made of a material having a higher specific gravity than iron. (6) According to any one of claims 2 to 5 of the utility model registration claim, wherein the mass body is configured so that it does not come out in the axial direction after being incorporated into the rotating spindle. Magnetic bearing spindle.