JP2001241433A - Machining method for dynamic pressure generating groove in dynamic pressure bearing - Google Patents

Machining method for dynamic pressure generating groove in dynamic pressure bearing

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Publication number
JP2001241433A
JP2001241433A JP2000054682A JP2000054682A JP2001241433A JP 2001241433 A JP2001241433 A JP 2001241433A JP 2000054682 A JP2000054682 A JP 2000054682A JP 2000054682 A JP2000054682 A JP 2000054682A JP 2001241433 A JP2001241433 A JP 2001241433A
Authority
JP
Japan
Prior art keywords
dynamic pressure
peripheral surface
face
pressure generating
generating groove
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
Application number
JP2000054682A
Other languages
Japanese (ja)
Other versions
JP4431244B2 (en
Inventor
Masaki Tagami
政喜 田上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seibu Electric and Machinery Co Ltd
Original Assignee
Seibu Electric and Machinery Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seibu Electric and Machinery Co Ltd filed Critical Seibu Electric and Machinery Co Ltd
Priority to JP2000054682A priority Critical patent/JP4431244B2/en
Publication of JP2001241433A publication Critical patent/JP2001241433A/en
Application granted granted Critical
Publication of JP4431244B2 publication Critical patent/JP4431244B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a machining method for a dynamic pressure generating groove capable of easily processing with low running cost a groove for generating dynamic pressure in a dynamic pressure bearing interposing fluid such as air between opposing inner and outer cylindrical circumferential faces for journaling it by dynamic pressure so as to freely relatively rotate. SOLUTION: A gap 9 interposing air is formed between the cylindrical inner circumferential face 6 of a shaft fitting body 2 composing the dynamic pressure bearing 1 and the cylindrical outer circumferential face 8 of a shaft body 7 rotatably fitted inside the cylindrical inner circumferential face 6. Power generating grooves 10 and 11 and an end face dynamic pressure generating groove 18 are formed by a cutting tool formed by diamond in positions spaced in an axial direction in the cylindrical inner circumferential face 6 made of stainless steel. The machining is performed into various shapes carbonization of the diamond is prevented by machining in low temperature, and the running cost can be reduced by reapplying the diamond by regrinding even when it is worn.

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】この発明は、流体の動圧を利
用して回転軸を軸支持する動圧軸受において、動圧軸受
面に形成される動圧発生溝の加工方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for machining a dynamic pressure generating groove formed on a surface of a dynamic pressure bearing in a dynamic pressure bearing for supporting a rotary shaft by utilizing dynamic pressure of a fluid.

【0002】[0002]

【従来の技術】従来、ポリゴンミラー、磁気ディスク、
光ディスク等の回転体を低摩擦で回転駆動するために、
空気軸受等の動圧軸受が用いられている。このような動
圧軸受の一例が、特開平8−196056号公報に開示
されている。この公報に開示の動圧軸受は、固定軸の外
周面にはヘリングボーン型の動圧発生用溝が軸方向に2
ブロックに分割して形成されており、固定軸の外側に、
ロータの円筒胴部が回転可能に装着されている。固定軸
の外周面と、ロータの円筒胴部の内面との間の空気動圧
が形成されてラジアル軸受が形成されている。固定軸の
軸端部から空気供給孔が軸方向に延びており、空気供給
孔は2ブロックの動圧発生用溝の中間部分送給され、動
圧発生用溝のポンピング作用によって軸方向に上下に流
動されて外部側に排出されている。
2. Description of the Related Art Conventionally, polygon mirrors, magnetic disks,
In order to rotate a rotating body such as an optical disk with low friction,
A dynamic pressure bearing such as an air bearing is used. One example of such a dynamic pressure bearing is disclosed in Japanese Patent Application Laid-Open No. H8-196056. In the dynamic pressure bearing disclosed in this publication, a herringbone type dynamic pressure generating groove is provided on the outer peripheral surface of the fixed shaft in the axial direction.
It is divided into blocks and formed outside the fixed shaft,
The cylindrical body of the rotor is rotatably mounted. Air dynamic pressure is formed between the outer peripheral surface of the fixed shaft and the inner surface of the cylindrical body of the rotor to form a radial bearing. An air supply hole extends in the axial direction from the shaft end of the fixed shaft. The air supply hole is fed in an intermediate portion of the dynamic pressure generation grooves of the two blocks, and is vertically moved in the axial direction by the pumping action of the dynamic pressure generation grooves. And is discharged to the outside.

【0003】上記のような動圧軸受の軸受面に動圧発生
用の溝を形成する加工方法としては、エッチング、プレ
ス、ブラスト、レーザ、転造等の加工方法が採用されて
いる。一般的に多く用いられている方法は、転造工具に
よる加工方法である。また、アルミニウムや真鍮のよう
な非鉄金属に溝加工する場合には、切削工具(ダイヤバ
イト等)を用いて切削加工により溝成形される場合もあ
る。
[0003] As a processing method for forming a groove for generating dynamic pressure on the bearing surface of the dynamic pressure bearing as described above, a processing method such as etching, pressing, blasting, laser, or rolling is adopted. A generally used method is a processing method using a rolling tool. In addition, when a groove is formed in a non-ferrous metal such as aluminum or brass, the groove may be formed by cutting using a cutting tool (such as a diamond tool).

【0004】既出の特開平8−196056号公報に開
示されている動圧軸受の軸受面に動圧発生用の溝を形成
する切削加工は、動圧面を構成す軸体及び軸嵌合体が、
被切削性に優れた真鍮、アルミニウム若しくはその合金
から形成され、かつ動圧面及び動圧発生溝の双方を切削
加工により形成することにより、面倒な転造やエッチン
グによることなく、動圧面及び動圧発生溝の双方を加工
精度を落とすことなく良好に形成可能となるとともに、
同一の切削加工機で着脱なしで形成することを図ってい
る。
In the cutting processing for forming a groove for generating a dynamic pressure on the bearing surface of the dynamic pressure bearing disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 8-196556, a shaft body and a shaft fitting body which constitute the dynamic pressure surface include:
Made of brass, aluminum or its alloys with excellent machinability, and by forming both the dynamic pressure surface and the dynamic pressure generating groove by cutting, the dynamic pressure surface and dynamic pressure can be reduced without troublesome rolling and etching. Both of the generated grooves can be formed well without lowering the processing accuracy,
It is intended to form with the same cutting machine without attaching and detaching.

【0005】しかしながら、いずれの方法も、製作コス
トや加工精度の面で満足のいくものはない。現在、主流
である転造工具を使用した転造溝加工においては、可能
な加工形状は円弧溝形状のみである。転造工具は、一度
摩耗すると再製作しなければならず、工具1本当たりの
単価も高価であり、ワーク1個当たりのランニングコス
トが高い。また、動圧発生溝の溝深さは、±1μmの公
差が要求され、転造工具では、一度摩耗すれば使用不可
能となるという問題点がある。
However, none of these methods is satisfactory in terms of manufacturing cost and processing accuracy. At present, in rolling groove machining using a rolling tool, which is a mainstream, the only possible machining shape is an arc groove shape. Once a rolled tool is worn, it must be remanufactured, the unit price per tool is high, and the running cost per work is high. In addition, the groove depth of the dynamic pressure generating groove is required to have a tolerance of ± 1 μm, and there is a problem that the rolling tool becomes unusable once worn out.

【0006】[0006]

【発明が解決しょうとする課題】ところで、最近、ハー
ドディスクドライブ(HDD)用の流体軸受部品は、ス
テンレス製素材が主流になっている。アルミニウム又は
その合金のような硬度が比較的低い素材に対して適用さ
れる溝加工方法を、ステンレスからなる高硬度の軸受部
品の溝加工にそのまま適用することはできない。
In recent years, stainless steel materials have become the mainstream for fluid bearing components for hard disk drives (HDDs). A groove processing method applied to a material having a relatively low hardness such as aluminum or an alloy thereof cannot be directly applied to groove processing of a high-hardness bearing component made of stainless steel.

【0007】更に、高硬度の素材を切削加工する方法と
して、ダイヤモンドを切削工具として用いることが考え
られる。しかしながら、ステンレスを含む鉄系素材の切
削にダイヤモンドを用いることは、一般切削の場合、ダ
イヤモンドの摩耗の進行が早く、使用に耐えるものでな
いとされるのが通説である。そこで、被切削材としてス
テンレス製である動圧発生用の流体軸受部品に、効率良
く溝加工することが可能な加工方法が模索されている。
Further, as a method of cutting a high hardness material, it is conceivable to use diamond as a cutting tool. However, it is generally accepted that the use of diamond for cutting an iron-based material including stainless steel, in the case of general cutting, causes rapid progress of wear of the diamond and is not endurable. Therefore, a processing method capable of efficiently forming grooves in a hydrodynamic bearing component made of stainless steel as a material to be cut has been sought.

【0008】[0008]

【課題を解決するための手段】本発明の目的は、上記の
課題を解決することであり、ステンレス素材からなる高
硬度の軸受部品を、切削加工にて溝加工を行うことが可
能な加工方法を提供することである。
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and a machining method capable of cutting a hardened bearing part made of a stainless steel material by cutting. It is to provide.

【0009】この発明は、上記の目的を達成するため、
次のように構成されている。即ち、この発明は、筒状外
周面を備えた軸体と、前記筒状外周面との間に動圧用の
隙間を介して対向する筒状内周面を備え且つ前記軸体と
相対回転する軸嵌合体とを具備し、前記筒状外周面と前
記筒状内周面との少なくとも一方が周面用動圧発生溝が
形成されたステンレス製筒状周面であることから成る動
圧軸受において、前記周面用動圧発生溝をダイヤモンド
から構成される切削バイトによって切削加工することを
特徴とする動圧軸受における動圧発生溝の加工方法に関
する。
The present invention achieves the above object by providing
It is configured as follows. That is, the present invention includes a shaft body having a cylindrical outer peripheral surface, and a cylindrical inner peripheral surface opposed to the cylindrical outer peripheral surface via a gap for dynamic pressure, and relatively rotates with the shaft body. A dynamic pressure bearing comprising a shaft fitting body, wherein at least one of the cylindrical outer peripheral surface and the cylindrical inner peripheral surface is a stainless steel cylindrical peripheral surface in which a peripheral surface dynamic pressure generating groove is formed. The present invention relates to a method for machining a dynamic pressure generating groove in a dynamic pressure bearing, wherein the peripheral dynamic pressure generating groove is cut by a cutting tool made of diamond.

【0010】また、この発明は、軸方向に面する端面を
備えた軸体と、前記端面との間に動圧用の隙間を介して
対向する対向端面を備え且つ前記軸体と相対回転する軸
嵌合体とを具備し、前記端面と前記対向端面との少なく
とも一方が端面用動圧発生溝が形成されたステンレス製
端面であることから成る動圧軸受において、前記端面用
動圧発生溝をダイヤモンドから構成される切削バイトに
よって切削加工することを特徴とする動圧軸受における
動圧発生溝の加工方法に関する。
Further, the present invention provides a shaft having an axially facing end face, and a shaft having an opposing end face opposed to the end face with a gap for dynamic pressure therebetween and relatively rotating with the shaft body. A dynamic pressure bearing comprising a fitting body, wherein at least one of the end face and the opposed end face is a stainless steel end face on which an end face dynamic pressure generating groove is formed. The present invention relates to a method for machining a dynamic pressure generating groove in a dynamic pressure bearing, characterized in that machining is performed by a cutting tool composed of:

【0011】更に、この発明は、筒状外周面及び軸方向
に面する端面を備えた軸体と、前記筒状外周面及び前記
端面との間にそれぞれ動圧用の隙間を介して対向する筒
状内周面及び対向端面を備え且つ前記軸体と相対回転す
る軸嵌合体とを具備し、前記軸体の前記筒状外周面及び
前記端面、又は前記軸嵌合体の前記筒状内周面及び前記
対向端面はそれぞれ周面用動圧発生溝が形成されたステ
ンレス製筒状周面及び端面用動圧発生溝が形成されたス
テンレス製端面であることから成る動圧軸受において、
前記周面用動圧発生溝及び前記端面用動圧発生溝をダイ
ヤモンドから構成される切削バイトによって切削加工す
ることを特徴とする動圧軸受における動圧発生溝の加工
方法に関する。
Furthermore, the present invention provides a shaft body having a cylindrical outer peripheral surface and an end surface facing in the axial direction, and a cylindrical member opposed to the cylindrical outer peripheral surface and the end surface via a gap for dynamic pressure. A shaft fitting body provided with a shaft-shaped inner peripheral surface and a facing end surface and rotating relative to the shaft body; and the cylindrical outer peripheral surface and the end surface of the shaft body, or the cylindrical inner peripheral surface of the shaft fitting body. And the opposed end surface is a stainless steel cylindrical peripheral surface formed with a peripheral surface dynamic pressure generating groove and a stainless steel end surface formed with an end surface dynamic pressure generating groove, respectively.
The present invention relates to a method for machining a dynamic pressure generating groove in a dynamic pressure bearing, wherein the peripheral surface dynamic pressure generating groove and the end surface dynamic pressure generating groove are cut by a cutting tool made of diamond.

【0012】この動圧発生溝の加工方法によれば、ステ
ンレス製筒状周面である軸体の外側筒状周面又は軸嵌合
体の内側筒状周面、或いはステンレス製端面である軸体
の端面と軸嵌合体の対向端面の溝切削加工には、ダイヤ
モンドが使用される。動圧発生溝の加工においては、回
転しているワークである軸体、又は軸嵌合体に対してダ
イヤモンドから成る切削バイトを当てることによって、
切削加工が行われる。軸体のステンレス製筒状周面であ
る外側筒状周面とステンレス製端面である端面とに動圧
発生溝を加工する場合、及び軸嵌合体のステンレス製筒
状周面である内側筒状周面とステンレス製端面である対
向端面においては、ダイヤモンドから構成される同じ切
削バイトで周面用動圧発生溝と端面用動圧発生溝を続け
て加工することもできる。
According to the method of machining the dynamic pressure generating groove, the outer cylindrical peripheral surface of the shaft, which is a stainless cylindrical peripheral surface, the inner cylindrical peripheral surface of the shaft fitting body, or the stainless steel cylindrical end surface. Diamond is used for the groove cutting of the end face of the shaft fitting body and the end face of the shaft fitting body. In the processing of the dynamic pressure generating groove, by applying a cutting tool made of diamond to the shaft body, which is a rotating work, or the shaft fitting body,
Cutting is performed. When a dynamic pressure generating groove is formed on the outer cylindrical peripheral surface which is the stainless cylindrical peripheral surface of the shaft and the end surface which is the stainless steel end surface, and the inner cylindrical which is the stainless cylindrical peripheral surface of the shaft fitting body On the peripheral surface and the opposite end surface which is the stainless steel end surface, the peripheral dynamic pressure generating groove and the end surface dynamic pressure generating groove can be continuously processed by the same cutting tool made of diamond.

【0013】切削バイトに用いられているダイヤモンド
は、摩耗しても研磨することにより再使用可能である。
この加工においては、切削バイトに対するワークの周速
が一般旋削の場合と比較して非常に低く設定されている
ため、切削加工に伴って切削バイトに発生する加工熱が
少ない。従って、ダイヤモンドの炭素化が進行せず、ス
テンレス製素材への良好な溝加工が実現される。
The diamond used in the cutting tool can be reused by polishing even if worn.
In this machining, the peripheral speed of the work with respect to the cutting tool is set to be much lower than in the case of general turning, so that the machining heat generated in the cutting tool during the cutting is small. Therefore, carbonization of diamond does not progress, and good groove processing on a stainless steel material is realized.

【0014】[0014]

【発明の実施の形態】以下、添付図面を参照しつつ、こ
の発明による動圧軸受における動圧発生溝の加工方法の
実施例を説明する。図1はこの発明による動圧軸受にお
ける動圧発生溝の加工方法で製作される動圧軸受の軸嵌
合体の一例を示す断面図、図2は図1に示す動圧軸受の
軸嵌合体の底面図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for machining a dynamic pressure generating groove in a dynamic pressure bearing according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an example of a shaft fitting body of a dynamic pressure bearing manufactured by a method of processing a dynamic pressure generating groove in a dynamic pressure bearing according to the present invention. FIG. 2 is a sectional view of the shaft fitting body of the dynamic pressure bearing shown in FIG. It is a bottom view.

【0015】図1に示す動圧軸受1の軸嵌合体2は、例
えば、固定側として設けられてた軸嵌合体であり、筒状
体3と、筒状体3の下端部おいて径方向に延びるフラン
ジ部4とから構成されている。フランジ部4には、周方
向に適宜の間隔で隔置して、取付け用の固着具(取付け
ボルト)が挿通される複数の取付け孔5が形成されてい
る。筒状体3には、軸方向に貫通する筒状内周面6が形
成されており、筒状内周面6には、想像線で示すよう
に、軸体7が軸嵌合体2に対して相対回転自在に嵌合配
置されている。この例では、筒状体3はステンレス製の
素材から形成されているが、それに合わせて、軸体7も
ステンレス製とすることができる。
The shaft fitting body 2 of the dynamic pressure bearing 1 shown in FIG. 1 is, for example, a shaft fitting body provided as a fixed side, and includes a cylindrical body 3 and a lower end of the cylindrical body 3 in a radial direction. And a flange portion 4 extending to the front. A plurality of mounting holes 5 are formed in the flange portion 4 at appropriate intervals in the circumferential direction and through which mounting fixing tools (mounting bolts) are inserted. A cylindrical inner peripheral surface 6 penetrating in the axial direction is formed in the cylindrical body 3, and a shaft 7 is disposed on the cylindrical inner peripheral surface 6 with respect to the shaft fitting body 2 as indicated by an imaginary line. And are rotatably fitted with each other. In this example, the cylindrical body 3 is made of a stainless steel material, but the shaft body 7 can be made of stainless steel in accordance with the material.

【0016】筒状体3の筒状内周面6は、軸体7の筒状
外周面8と共に、動圧軸受1の周面用動圧面を構成して
おり、筒状内周面6と筒状外周面8との間には、動圧作
動用の流体(例えば、空気)が介在する隙間9が形成さ
れている。筒状体3がステンレス製であるので、筒状体
3の筒状内周面6もステンレスの表面に形成されてい
る。筒状内周面6には、更に、軸方向に隔置した2つの
位置においてヘリングボーン型の周面用動圧発生溝1
0,11が形成されている。筒状内周面6自体も切削加
工により形成されているが、周面用動圧発生溝10,1
1は、ダイヤモンドから製作された切削バイトによって
形成されている。筒状内周面6の周面用動圧発生溝1
0,11間には、内径を僅かに大きくした逃げ部12が
形成されている。周面用動圧発生溝10,11は、軸嵌
合体2が軸体7に対して回転するとき、隙間9内の流体
によってラジアル方向の動圧を発生するので、軸嵌合体
2は軸体7に対してラジアル方向に回転自在に支持され
る。なお、筒状内周面6及び動圧発生溝10,11に
は、適宜の表面処理を施すことが可能である。
The cylindrical inner peripheral surface 6 of the cylindrical body 3 and the cylindrical outer peripheral surface 8 of the shaft body 7 constitute a peripheral dynamic pressure surface of the dynamic pressure bearing 1. A gap 9 is formed between the cylindrical outer peripheral surface 8 and a fluid (for example, air) for dynamic pressure operation. Since the tubular body 3 is made of stainless steel, the tubular inner peripheral surface 6 of the tubular body 3 is also formed on the surface of stainless steel. In the cylindrical inner peripheral surface 6, a herringbone type peripheral surface dynamic pressure generating groove 1 is further provided at two axially spaced positions.
0 and 11 are formed. Although the cylindrical inner peripheral surface 6 itself is also formed by cutting, the peripheral surface dynamic pressure generating grooves 10 and 1 are formed.
1 is formed by a cutting tool made from diamond. Dynamic pressure generating groove 1 for peripheral surface of cylindrical inner peripheral surface 6
Between 0 and 11, there is formed a relief portion 12 having a slightly larger inner diameter. When the shaft fitting body 2 rotates with respect to the shaft body 7, the fluid in the gap 9 generates a dynamic pressure in the radial direction when the shaft fitting body 2 rotates with respect to the shaft body 7, so that the shaft fitting body 2 7 is rotatably supported in the radial direction. The cylindrical inner peripheral surface 6 and the dynamic pressure generating grooves 10 and 11 can be subjected to appropriate surface treatment.

【0017】軸体7の軸方向を向く端面13と、端面1
3と対向する筒状体3の対向端面14とは、共働して動
圧軸受1の端面用動圧面を構成しており、端面13と対
向端面14との間には、動圧作動用の流体(例えば空
気)が介在する隙間15が形成されている。筒状体3が
ステンレス製であるので、筒状体3の対向端面14もス
テンレスの表面に形成されている。筒状体3の対向端面
14自体も切削加工により形成されているが、対向端面
14には、更に、環状の領域16において周方向に隔置
して複数の放射状に拡がった区域17に、端面用動圧発
生溝18(一部のみ符号で指す)が形成されている。端
面用動圧発生溝18は、ダイヤモンドから製作された切
削バイトによって周方向に対して傾斜して形成されてい
る。軸嵌合体2が軸体7に対して回転するとき、端面用
動圧発生溝18は隙間15内の流体によってスラスト方
向の動圧を発生するので、軸嵌合体2は軸体7に対して
スラスト方向に回転自在に支持される。なお、対向端面
14及び動圧発生溝18には、適宜の表面処理を施すこ
とができ、また、端面用動圧発生溝18の溝形状は、周
面用動圧発生溝10,11と同様に、ヘリングボーン型
とすることもできる。
An end face 13 of the shaft body 7 facing in the axial direction and an end face 1
3 and the opposing end surface 14 of the cylindrical body 3 opposing each other, constitute a dynamic pressure surface for the end surface of the dynamic pressure bearing 1, and between the end surface 13 and the opposing end surface 14, there is a dynamic pressure operating surface. A gap 15 in which the fluid (for example, air) intervenes is formed. Since the tubular body 3 is made of stainless steel, the facing end surface 14 of the tubular body 3 is also formed on the surface of stainless steel. The opposed end surface 14 itself of the cylindrical body 3 is also formed by cutting, but the opposed end surface 14 is further provided with a plurality of radially expanded sections 17 circumferentially spaced in an annular region 16. A use dynamic pressure generating groove 18 (only a part is indicated by a reference numeral) is formed. The end face dynamic pressure generating groove 18 is formed to be inclined with respect to the circumferential direction by a cutting tool made of diamond. When the shaft fitting body 2 rotates with respect to the shaft body 7, the dynamic pressure generating groove 18 for the end surface generates a dynamic pressure in the thrust direction by the fluid in the gap 15. It is rotatably supported in the thrust direction. The facing end face 14 and the dynamic pressure generating groove 18 can be subjected to appropriate surface treatment. The groove shape of the end face dynamic pressure generating groove 18 is the same as that of the peripheral face dynamic pressure generating grooves 10 and 11. Alternatively, a herringbone type can be used.

【0018】ダイヤモンドから製作された切削バイトに
よる切削加工においては、ワークである軸嵌合体2が回
転されるが、その周速は、一般旋削時と比較して極端に
低く設定されているので、切削加工に伴って発生する加
工熱が非常に少ない。従って、ダイヤモンドの炭素化が
進行せず、ステンレス製の素材に対して、良好な溝が加
工を施すことができる。
In the cutting process using a cutting tool made of diamond, the shaft fitting body 2 as a work is rotated. However, since the peripheral speed is set to be extremely lower than that in general turning, Very little processing heat generated by cutting. Therefore, carbonization of diamond does not progress, and a good groove can be formed on a stainless steel material.

【0019】上記の例では、軸嵌合体2の筒状内周面5
にヘリングボーン型の周面用動圧発生溝10,11を形
成し、軸嵌合体2の対向端面14に端面用動圧発生溝1
8を形成していたが、周面用動圧発生溝については、軸
嵌合体2の筒状内周面6に形成する代わりに、軸体7の
筒状外周面8に、又は軸嵌合体2の筒状内周面5と軸体
7の筒状外周面8の双方に形成してもよい。また、端面
用動圧発生溝については、軸嵌合体2の対向端面14に
形成する代わりに、軸体7の端面13に、又は軸嵌合体
2の対向端面14と軸体7の端面13の双方に形成して
もよい。
In the above example, the cylindrical inner peripheral surface 5 of the shaft fitting body 2
The herringbone type dynamic pressure generating grooves 10 and 11 for the peripheral surface are formed on the
8, the dynamic pressure generating groove for the peripheral surface is formed on the cylindrical outer peripheral surface 8 of the shaft 7 instead of being formed on the cylindrical inner peripheral surface 6 of the shaft fitting 2. 2 may be formed on both the cylindrical inner peripheral surface 5 and the cylindrical outer peripheral surface 8 of the shaft body 7. Further, instead of forming the dynamic pressure generating groove for the end face on the opposed end face 14 of the shaft fitting body 2, the dynamic pressure generating groove is formed on the end face 13 of the shaft body 7 or on the opposed end face 14 of the shaft fitting body 2 and the end face 13 of the shaft body 7. They may be formed on both sides.

【0020】この発明による動圧軸受における動圧発生
溝の加工態様の一例の概略が、図3に示されている。図
3に示す加工工程は、軸嵌合体2をワークとしてその筒
状内周面6と端面14とに施される切削加工を示してお
り、矢印に沿って移動する切削バイトにより切削加工が
行われる。軸嵌合体2は、回転するワーク保持体20に
保持された状態で、軸嵌合体2の回転中心C−Cの回り
にゆっくりと回転される。切削バイトT1は、荒加工用
バイトであり、軸嵌合体2の対向端面14に沿った方向
に移動し更に筒状体2の内部へと移動して、対向端面1
4と筒状内周面6との荒加工を行う。切削バイトT2
は、端面溝加工用のダイヤモンド製バイトであり、軸嵌
合体2の対向端面14に沿って移動して端面用動圧発生
溝18を加工する。また、切削バイトT3は、周面溝加
工用のダイヤモンド製バイトであり、軸嵌合体2の軸方
向に移動しつつ周面用動圧発生溝10,11を加工す
る。最後に、切削バイトT4は、端面及び周面仕上げ用
の切削バイトであり、軸嵌合体2の対向端面14に沿っ
た方向に移動し更に軸嵌合体2の筒状内周面6に沿って
移動して、対向端面14と筒状内周面6との仕上げ加工
を行う。
FIG. 3 schematically shows an example of a working mode of the dynamic pressure generating groove in the dynamic pressure bearing according to the present invention. The machining process shown in FIG. 3 shows a cutting process performed on the cylindrical inner peripheral surface 6 and the end surface 14 using the shaft fitting body 2 as a work, and the cutting process is performed by a cutting tool moving along the arrow. Will be The shaft fitting body 2 is slowly rotated around the rotation center CC of the shaft fitting body 2 while being held by the rotating work holding body 20. The cutting tool T1 is a roughing tool, and moves in a direction along the facing end face 14 of the shaft fitting body 2 and further moves inside the tubular body 2 so that the facing end face 1
4 and the cylindrical inner peripheral surface 6 are roughed. Cutting tool T2
Is a diamond cutting tool for machining an end face groove, and moves along the facing end face 14 of the shaft fitting body 2 to machine the end face dynamic pressure generating groove 18. The cutting tool T3 is a diamond tool for processing a peripheral surface groove, and processes the peripheral surface dynamic pressure generating grooves 10 and 11 while moving in the axial direction of the shaft fitting body 2. Finally, the cutting tool T4 is a cutting tool for finishing the end face and the peripheral surface, moves in a direction along the opposed end face 14 of the shaft fitting body 2, and further moves along the cylindrical inner peripheral surface 6 of the shaft fitting body 2. It moves to finish the facing end surface 14 and the cylindrical inner peripheral surface 6.

【0021】[0021]

【発明の効果】この発明による動圧軸受における動圧発
生溝の加工方法は、上記に説明した工程で行われるの
で、次のような効果が得られる。即ち、この発明による
動圧軸受における動圧発生溝の加工方法によれば、ダイ
ヤモンドから製作される切削バイトによって動圧発生溝
を切削加工しているので、ダイヤモンドから製作される
切削バイトの形状を溝形状に合わせることにより、様々
な溝形状を有する動圧発生溝を容易に実現できる。ま
た、ダイヤモンドから製作される切削バイトによる溝加
工は、切削バイトが摩耗しても切削バイトを再研磨する
ことで、切削バイトを再使用することが可能であり、再
研磨費用も転造工具による製作費用の1/3〜1/5で
済ますことができる。更に、±1μmの公差が要求され
る動圧発生溝の溝深さに対して、ダイヤモンドから製作
される切削バイトでは、機械の座標オフセットにて補正
できるメリットがある。
The method of machining a dynamic pressure generating groove in a dynamic pressure bearing according to the present invention is performed in the steps described above, and the following effects are obtained. That is, according to the dynamic pressure generating groove machining method in the dynamic pressure bearing according to the present invention, the dynamic pressure generating groove is cut by the cutting tool manufactured from diamond, so that the shape of the cutting tool manufactured from diamond is reduced. By adjusting to the groove shape, dynamic pressure generating grooves having various groove shapes can be easily realized. In addition, in the case of grooving with a cutting tool manufactured from diamond, the cutting tool can be reused by re-polishing the cutting tool even if the cutting tool wears out, and the re-polishing cost also depends on the rolling tool. The cost can be reduced to 1/3 to 1/5 of the production cost. Further, the cutting tool made of diamond has a merit that it can be corrected by the machine coordinate offset with respect to the groove depth of the dynamic pressure generating groove that requires a tolerance of ± 1 μm.

【図面の簡単な説明】[Brief description of the drawings]

【図1】この発明による動圧軸受における動圧発生溝の
加工方法によって製作された動圧軸受の一例を示す縦断
面図である。
FIG. 1 is a longitudinal sectional view showing an example of a dynamic pressure bearing manufactured by a method for processing a dynamic pressure generating groove in a dynamic pressure bearing according to the present invention.

【図2】図1に示す動圧軸受の底面図である。FIG. 2 is a bottom view of the dynamic pressure bearing shown in FIG.

【図3】この発明による動圧軸受における動圧発生溝の
加工態様を示す概略図である。
FIG. 3 is a schematic view showing a working mode of a dynamic pressure generating groove in the dynamic pressure bearing according to the present invention.

【符号の説明】[Explanation of symbols]

1 動圧軸受 2 軸嵌合体 6 筒状内周面 7 軸体 8 筒状外周面 9 隙間 10,11 周面用動圧発生溝 13 端面 14 対向端面 15 隙間 18 端面用動圧発生溝 T1〜T4 切削バイト DESCRIPTION OF SYMBOLS 1 Dynamic pressure bearing 2 Shaft fitting 6 Cylindrical inner peripheral surface 7 Shaft 8 Cylindrical outer peripheral surface 9 Gap 10, 11 Peripheral dynamic pressure generating groove 13 End face 14 Opposing end face 15 Gap 18 End face dynamic pressure generating groove T1 T4 cutting tool

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 筒状外周面を備えた軸体と、前記筒状外
周面との間に動圧用の隙間を介して対向する筒状内周面
を備え且つ前記軸体と相対回転する軸嵌合体とを具備
し、前記筒状外周面と前記筒状内周面との少なくとも一
方が周面用動圧発生溝が形成されたステンレス製筒状周
面であることから成る動圧軸受において、前記周面用動
圧発生溝をダイヤモンドから構成される切削バイトによ
って切削加工することを特徴とする動圧軸受における動
圧発生溝の加工方法。
A shaft having a cylindrical outer peripheral surface and a cylindrical inner peripheral surface opposed to the cylindrical outer peripheral surface with a gap for dynamic pressure therebetween and rotating relative to the shaft body; A dynamic pressure bearing comprising a fitting body, wherein at least one of the cylindrical outer peripheral surface and the cylindrical inner peripheral surface is a stainless steel cylindrical peripheral surface on which a peripheral surface dynamic pressure generating groove is formed. A method of machining a dynamic pressure generating groove in a dynamic pressure bearing, wherein the peripheral surface dynamic pressure generating groove is cut by a cutting tool made of diamond.
【請求項2】 軸方向に面する端面を備えた軸体と、前
記端面との間に動圧用の隙間を介して対向する対向端面
を備え且つ前記軸体と相対回転する軸嵌合体とを具備
し、前記端面と前記対向端面との少なくとも一方が端面
用動圧発生溝が形成されたステンレス製端面であること
から成る動圧軸受において、前記端面用動圧発生溝をダ
イヤモンドから構成される切削バイトによって切削加工
することを特徴とする動圧軸受における動圧発生溝の加
工方法。
2. A shaft body having an end face facing in the axial direction, and a shaft fitting body having an opposing end face opposed to the end face via a gap for dynamic pressure and rotating relatively to the shaft body. A dynamic pressure bearing comprising at least one of the end face and the opposed end face being a stainless steel end face having an end face dynamic pressure generating groove formed therein, wherein the end face dynamic pressure generating groove is made of diamond. A method for processing a dynamic pressure generating groove in a dynamic pressure bearing, wherein the processing is performed by a cutting tool.
【請求項3】 筒状外周面及び軸方向に面する端面を備
えた軸体と、前記筒状外周面及び前記端面との間にそれ
ぞれ動圧用の隙間を介して対向する筒状内周面及び対向
端面を備え且つ前記軸体と相対回転する軸嵌合体とを具
備し、前記軸体の前記筒状外周面及び前記端面、又は前
記軸嵌合体の前記筒状内周面及び前記対向端面はそれぞ
れ周面用動圧発生溝が形成されたステンレス製筒状周面
及び端面用動圧発生溝が形成されたステンレス製端面で
あることから成る動圧軸受において、前記周面用動圧発
生溝及び前記端面用動圧発生溝をダイヤモンドから構成
される切削バイトによって切削加工することを特徴とす
る動圧軸受における動圧発生溝の加工方法。
3. A shaft body having a cylindrical outer peripheral surface and an end surface facing in the axial direction, and a cylindrical inner peripheral surface opposed to the cylindrical outer peripheral surface and the end surface via a gap for dynamic pressure, respectively. And a shaft fitting body that has a facing end face and rotates relative to the shaft body, and the cylindrical outer peripheral surface and the end face of the shaft body, or the cylindrical inner circumferential surface and the facing end face of the shaft fitting body. Is a stainless steel cylindrical peripheral surface having a peripheral surface dynamic pressure generating groove formed thereon and a stainless steel end surface having an end surface dynamic pressure generating groove formed therein. A method of machining a dynamic pressure generating groove in a dynamic pressure bearing, wherein the groove and the end face dynamic pressure generating groove are cut by a cutting tool made of diamond.
JP2000054682A 2000-02-29 2000-02-29 Method for machining dynamic pressure generating groove in hydrodynamic bearing Expired - Fee Related JP4431244B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000054682A JP4431244B2 (en) 2000-02-29 2000-02-29 Method for machining dynamic pressure generating groove in hydrodynamic bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000054682A JP4431244B2 (en) 2000-02-29 2000-02-29 Method for machining dynamic pressure generating groove in hydrodynamic bearing

Publications (2)

Publication Number Publication Date
JP2001241433A true JP2001241433A (en) 2001-09-07
JP4431244B2 JP4431244B2 (en) 2010-03-10

Family

ID=18575902

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000054682A Expired - Fee Related JP4431244B2 (en) 2000-02-29 2000-02-29 Method for machining dynamic pressure generating groove in hydrodynamic bearing

Country Status (1)

Country Link
JP (1) JP4431244B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005061853A1 (en) * 2005-12-23 2007-07-05 Minebea Co., Ltd. spindle motor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111917258B (en) * 2020-08-31 2021-05-18 阜南县特立电子有限公司 Lower shell shaft pressing equipment for direct-current brushless motor and shaft pressing method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005061853A1 (en) * 2005-12-23 2007-07-05 Minebea Co., Ltd. spindle motor

Also Published As

Publication number Publication date
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