JPH03166038A - Method for discharging oil used for lubrication of spindle - Google Patents
Method for discharging oil used for lubrication of spindleInfo
- Publication number
- JPH03166038A JPH03166038A JP30735189A JP30735189A JPH03166038A JP H03166038 A JPH03166038 A JP H03166038A JP 30735189 A JP30735189 A JP 30735189A JP 30735189 A JP30735189 A JP 30735189A JP H03166038 A JPH03166038 A JP H03166038A
- Authority
- JP
- Japan
- Prior art keywords
- spindle
- oil
- lubricating oil
- mounting frame
- spindle mounting
- 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
- 238000005461 lubrication Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 6
- 238000007599 discharging Methods 0.000 title 1
- 239000003921 oil Substances 0.000 claims abstract description 84
- 239000010687 lubricating oil Substances 0.000 claims abstract description 35
- 238000006073 displacement reaction Methods 0.000 abstract description 8
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Auxiliary Devices For Machine Tools (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野〕
本発明は、工作機械のスピンドル潤滑における排油方法
に関し、特にいわゆるオイルジェット潤滑される工作機
械の熱変位問題を改善するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for draining oil in spindle lubrication of machine tools, and in particular, to improve the thermal displacement problem of machine tools that are lubricated with so-called oil jets.
従来のいわゆるオイルジェット潤滑方式による工作機城
のスピンドル軸受潤滑装置としては、例えば実公昭４３
−２８４８１号公報に示されたものがある。このものは
、スピンドルを支承した軸受部の外側を覆うハウジング
に、ハウジング外部から軸受部に到る給油路を設けると
共に軸受部からハウジング外部に到る排油路を設け、前
記給油路を介して給油ポンプにより強制給油した高圧多
量の潤滑油を、前記排油路を介して排油ボンプにより強
制排油するようにしたものである。For example, as a spindle bearing lubrication device for a machine tool castle using the conventional so-called oil jet lubrication method,
There is one shown in Japanese Patent No.-28481. In this device, a housing that covers the outside of a bearing that supports a spindle is provided with an oil supply passage from the outside of the housing to the bearing, and an oil drainage passage from the bearing to the outside of the housing. A large amount of high-pressure lubricating oil, which is forcibly supplied by an oil supply pump, is forcibly drained by an oil drain pump through the oil drain passage.
上記従来例にあっては、横形スピンドルを水平に支承す
るべくハウジングの後部側が工作機械のスピントル取付
け機台に固定されるが、ハウジング内に設けられた排油
路の排出端はそのハウジング後部側に位置している。そ
のため、排出端から排油ボンプで排出される潤滑油は、
スピンドル取付け機台内に設けた排油管路を経由して吸
引され潤滑装置に戻されることになる。しかして、スピ
ンドルの熱変位を小さくするには、強制給油される潤滑
油の温度を気温に対して±Ｏ ｄｅｇに制御することが
望ましい。In the above conventional example, the rear side of the housing is fixed to the spindle mounting base of the machine tool in order to horizontally support the horizontal spindle, but the discharge end of the oil drain passage provided in the housing is on the rear side of the housing. It is located in Therefore, the lubricating oil discharged from the discharge end by the oil drain pump is
The oil is sucked through a drain pipe provided in the spindle mounting machine and returned to the lubricating device. Therefore, in order to reduce the thermal displacement of the spindle, it is desirable to control the temperature of the lubricating oil that is forcibly supplied within ±O degrees with respect to the air temperature.
しかしながら、排出側の潤滑油温度は軸受部の回転によ
る発熱で気温よりかなり高くなる。この高温になった潤
滑油が、排油路からスピンドル取付け機台内に設けた排
油管路を経由してオイルタンクに戻されると、スピンド
ル取付け機台の温度が高くなる。スピンドル取付け機台
はスピンドルよりかなり大きいから、僅かな温度変化で
もその熱変形が大きくなる。したがって吸引排出される
潤滑油と気温との温度差でスピンドル取付け機台が大き
く変形し、その結果スピンドルが変位して工作機械の加
工精度が劣化するという問題点があった。However, the temperature of the lubricating oil on the discharge side becomes considerably higher than the air temperature due to heat generated by the rotation of the bearing. When this high-temperature lubricating oil is returned to the oil tank from the oil drain path via the drain oil pipe line provided in the spindle mounting machine base, the temperature of the spindle mounting machine base becomes high. Since the spindle mounting base is considerably larger than the spindle, even a slight temperature change will result in large thermal deformations. Therefore, there is a problem in that the spindle mounting machine base is greatly deformed due to the temperature difference between the lubricating oil that is sucked and discharged and the ambient temperature, and as a result, the spindle is displaced and the machining accuracy of the machine tool is degraded.
そこで本発明は、上記従来の問題点に着目してなされた
ものであり、潤滑油の排出経路をスピンドル取付け機台
から分離することにより、スピンドル取付け機台の熱変
形を抑制して上記従来の問題点を解決することを目的と
している。Therefore, the present invention has been made by focusing on the above-mentioned conventional problems, and by separating the lubricating oil discharge path from the spindle mounting machine base, thermal deformation of the spindle mounting machine base is suppressed. The purpose is to solve problems.
〔課題を解決するための手段］
上記目的を達成するため、本発明は、スピンドルを支承
した軸受部の外側を覆うハウジングに、ハウジング外部
から軸受部に到る給油路を設けると共に軸受部からハウ
ジング外部ムこ到る排油路を設け、前記給油路を介して
強制給油した潤滑油を前記排油路を介して強制排油する
ようにしたスピンドル潤滑において、前記排油路を経て
強制排油される潤滑油を前記スピンドルの取付け機台と
は分離させた排油管路を介して吸引する。[Means for Solving the Problems] In order to achieve the above object, the present invention provides an oil supply path from the outside of the housing to the bearing in a housing that covers the outside of a bearing that supports a spindle, and also provides an oil supply path from the bearing to the housing. In spindle lubrication, in which an oil drain path is provided throughout the exterior, and the lubricating oil forcibly supplied through the oil supply path is forcibly drained through the oil drain path, the oil is forcibly drained through the oil drain path. The lubricating oil is sucked through an oil drain line separated from the spindle mounting base.
前記排油管路は、前記スピンドルの取付け機台に後端側
が保持された前記ハウジングの先端部に接続すれば更に
有効である。It is more effective if the oil drain pipe is connected to the front end of the housing, the rear end of which is held on the mounting base of the spindle.
軸受部の発熱を吸収して温度が上昇した潤滑油は、スピ
ンドル取付け機台とは分離させた排油管路を介して吸引
されるから、スピンドル取付け機台の温度上昇が抑制さ
れその熱変形が防止される。The lubricating oil, whose temperature has increased by absorbing the heat generated by the bearing, is sucked through the oil drain pipe that is separated from the spindle mounting machine, which suppresses the temperature rise of the spindle mounting machine and prevents its thermal deformation. Prevented.
したがってスピンドルの変位が小さくなり、工作機械の
加工精度が向上する。Therefore, the displacement of the spindle is reduced, and the machining accuracy of the machine tool is improved.
（実施例） 以下、本発明の実施例を図とともに説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.
第１図及び第２図は、本発明の一実施例を示すものであ
る。スピンドル軸受装置１は、スピントル２を回転自在
に水平に支承した複数個（図では４個）のころがり軸受
３と、この軸受３の外側を覆うハウジング５を備えてい
る。この実施例のハウジング５は、軸受３の外周を取巻
いている円筒状で後部寄りにフランジ６を有する外筒体
７と、この外筒体７の前端面に固着された前カバー８お
よび後端面に固着された後カバー９とで構威されている
。上記複数個の軸受３の外輪３Ａは短間座１０と長間座
１１とを介して軸方向に間隔をおいて配置されている。1 and 2 show an embodiment of the present invention. The spindle bearing device 1 includes a plurality of (four in the figure) rolling bearings 3 that rotatably horizontally support a spindle 2, and a housing 5 that covers the outside of the bearings 3. The housing 5 of this embodiment includes a cylindrical outer cylinder 7 surrounding the outer periphery of the bearing 3 and having a flange 6 near the rear, a front cover 8 fixed to the front end surface of the outer cylinder 7, and a rear cover 8 fixed to the front end surface of the outer cylinder 7. It is comprised of a rear cover 9 fixed to the end face. The outer rings 3A of the plurality of bearings 3 are arranged at intervals in the axial direction via a short washer 10 and a long washer 11.
その最後尾の軸受の外輪３Ａは外筒体７の内径段部ｌ２
に係止されると共に、最前部の軸受の外輪３Ａは前カバ
ー８に当接されている。こうして各軸受の外輸３Ａは、
外筒体７の内周面に固定されている。The outer ring 3A of the rearmost bearing is located at the inner diameter stepped portion l2 of the outer cylinder body 7.
The outer ring 3A of the frontmost bearing is in contact with the front cover 8. In this way, the imported 3A of each bearing is
It is fixed to the inner peripheral surface of the outer cylinder body 7.
一方、各軸受３の内輪３Ｂは短間座ｌ４と長間座１５と
を介して軸方向に間隔をおいて配置されている。その最
前部の軸受の内輪３Ｂは、スピンドル２の外径段部１６
に当接する前内輪押さえ部材ｌ７に係止されると共に、
最後尾の軸受の内輪３Ｂは後内輪押さえ部材１８の前端
に係止されている。更に、後内輪押さえ部材ｌ８の後端
はスピンドルに嵌合された押さえリングｌ９に係止され
、この押さえリングｌ９の後端面がスピンドル２の後部
に形威された外径ねじ２１に螺合したナット２２の座面
に係止されて軸方向に押圧されている。On the other hand, the inner rings 3B of each bearing 3 are arranged at intervals in the axial direction via a short washer l4 and a long washer 15. The inner ring 3B of the frontmost bearing is connected to the outer diameter stepped portion 16 of the spindle 2.
While being locked to the front inner ring pressing member l7 that comes into contact with the
The inner ring 3B of the rearmost bearing is locked to the front end of the rear inner ring pressing member 18. Further, the rear end of the rear inner ring holding member l8 is locked to a holding ring l9 fitted to the spindle, and the rear end surface of this holding ring l9 is screwed into an outer diameter screw 21 formed at the rear of the spindle 2. It is locked onto the seat surface of the nut 22 and pressed in the axial direction.
こうして各軸受の内輪３Ｂは、スピンドル２の外径面に
一体回転可能に固定されている。In this way, the inner ring 3B of each bearing is fixed to the outer diameter surface of the spindle 2 so as to be integrally rotatable.
外筒体７の上部には潤滑油の給油路２３が軸方向に長く
内設されており、その人口２４が外筒体のフランジ６の
後面に開口している。又、外筒体７の下部には潤滑油の
排油路２５が軸方向に長く内設されている。そして、そ
の出口２６は外筒体の前端に固着されている前カハー８
の下面に開口している。給油路２３は、外筒体７の内径
面に開口する半径方向の分岐給油路２７を複数有してい
る。一方、各軸受３の外輪３Ａ間に嵌挿された短間座｛
０と長間座ｌ１との上部には、各軸受３の転勤休転動空
間に向けて開口している給油分配路２８がそれぞれ形成
されている。前記分岐給油路２７は、それらの各給油分
配路２８にそれぞれ連通している。排油路２５は、外筒
体７の内径面に開口する半径方向の分岐排油路２９を複
数有している。一方、前記短間座１０と長間座１１との
下部には、各軸受３の転勤休転動空間に連なる俳柚集配
路３０がそれぞれ形成されている。前記分岐排油路２９
は、それらの各排油集配路３０にそれぞれ連通している
。なお、スピンドル２の軸心部には貫通孔３５が形成さ
れており、その前端部は工具取付け用のテーパ面３６に
なっている。A lubricating oil supply passage 23 is provided in the upper part of the outer cylinder 7 and is long in the axial direction, and its opening 24 opens at the rear surface of the flange 6 of the outer cylinder. Further, a lubricating oil drain passage 25 is provided in the lower part of the outer cylinder 7 and is long in the axial direction. The outlet 26 is connected to a front cover 8 fixed to the front end of the outer cylinder.
It is open on the bottom side. The oil supply passage 23 has a plurality of radial branch oil supply passages 27 that open to the inner diameter surface of the outer cylinder 7. On the other hand, a short washer inserted between the outer rings 3A of each bearing 3 {
Oil supply distribution passages 28 that open toward the rolling spaces of the respective bearings 3 are formed in the upper portions of the bearings 0 and l1. The branch oil supply passage 27 communicates with each of the oil supply distribution passages 28 . The oil drain path 25 has a plurality of radial branch oil drain paths 29 that open to the inner diameter surface of the outer cylinder 7. On the other hand, in the lower part of the short seat 10 and the long seat 11, there are formed collection and distribution passages 30 which are connected to the rolling spaces of the respective bearings 3. The branch oil drain path 29
are in communication with each of those drain oil collection and distribution paths 30, respectively. A through hole 35 is formed in the axial center of the spindle 2, and the front end thereof is a tapered surface 36 for attaching a tool.
以上のように構成されたスピンドル軸受装置】は、第２
図に示すように、そのハウジング５の後端側がフランジ
６を介して工作機械のスピンドル取付け機台３７で保持
され取付けられる。スピンドル２の後端はスピンドル取
付け機台３７に内設された駆動モータ３９の出力軸３９
ａにカップリング３８を介して連結される。[Spindle bearing device configured as described above] has a second
As shown in the figure, the rear end side of the housing 5 is held and attached via a flange 6 to a spindle mounting stand 37 of a machine tool. The rear end of the spindle 2 is connected to the output shaft 39 of a drive motor 39 installed inside the spindle mounting base 37.
a via a coupling 38.
工作Ｉａ械の近傍に、油冷却器４１と潤滑油タンク４２
と給油ボンプ４３および排油ボンプ４４を備えた潤滑装
置４５が配設されている。給油ポンブ４３のデリベリ側
に接続された給油配管４６は、スピンドル取付け機台３
７に内設された給油経路４７の入口に接続される。その
給油経路４７の出口は、スピンドル軸受装置１に内設さ
れた給油路２３の人口２４に連通している。An oil cooler 41 and a lubricating oil tank 42 are installed near the machine Ia.
A lubricating device 45 including an oil supply pump 43 and an oil drain pump 44 is provided. A refueling pipe 46 connected to the delivery side of the refueling pump 43 is connected to the spindle mounting machine base 3.
It is connected to an inlet of an oil supply path 47 provided inside the fuel tank 7. The outlet of the oil supply path 47 communicates with the port 24 of the oil supply path 23 provided inside the spindle bearing device 1 .
また、スピンドル軸受装置ｌに内設された排油路２５の
出口２６には、排油ポンプ４４のサクション側の排油配
管４８が接続される。この排油配管４８は、スピンドル
取付け機台３７とは分離して独立に配設されている。Further, an oil drain pipe 48 on the suction side of the oil drain pump 44 is connected to the outlet 26 of the oil drain path 25 installed inside the spindle bearing device l. This drain oil pipe 48 is arranged separately and independently from the spindle mounting machine stand 37.
油冷却器４１により気温±Ｏ ｄｅｇに温度制御された
潤滑油タンク４２内の潤滑油は、給油ボンプ４３を用い
、給柚配管４６から給油経路４７を経てスピンドル軸受
装置１の給油路２３に供給される。更に給油路２３から
各分岐給油路２７に分岐され、給油分配路２８を経由し
て各抽受３の転勤休転動空間の上部に噴射される。そし
て転勤体転勤空間内を上部から下部に流下しつつ、軸受
３を潤滑すると同時に発生した熱を奪う。この過程で潤
滑油自身の温度は上昇して、気温より高くなる。The lubricating oil in the lubricating oil tank 42 whose temperature is controlled to ±O deg by the oil cooler 41 is supplied from the oil supply pipe 46 to the oil supply path 23 of the spindle bearing device 1 via the oil supply path 47 using the oil supply pump 43. be done. The oil is further branched from the oil supply path 23 into each branch oil supply path 27, and is injected into the upper part of the transfer/pause rolling space of each extractor 3 via the oil distribution path 28. Then, while flowing down from the upper part to the lower part in the transfer space of the transfer body, it lubricates the bearing 3 and at the same time removes the generated heat. During this process, the temperature of the lubricating oil itself increases and becomes higher than the air temperature.
こうして各軸受３の下部に至った潤滑油は、スピンドル
２の回転による遠心力で排油集配路３０から分岐排油路
２９を経て排油路２５に排出される。The lubricating oil that has reached the lower part of each bearing 3 in this way is discharged from the drain oil collection and distribution path 30 to the oil drain path 25 via the branch oil drain path 29 due to the centrifugal force caused by the rotation of the spindle 2.
排油路２５内の排出油は、出口２６から排浦配管４８を
経て｛ノ［油ポンプ４４で吸引され、潤滑油タンク４２
に戻される。The drained oil in the drain oil passage 25 is sucked by the oil pump 44 from the outlet 26 through the drain piping 48, and is sent to the lubricating oil tank 42.
will be returned to.
このとき、排油配管４８はスピンドル取付け機台３７か
ら分離独立しているから、気温より高温度の排出潤滑油
からスピンドル取付け機台３７に伝達される熱量は少な
くなる。かくして、本実施例によれば、スピンドル軸受
装置１内を冷却しつつ潤滑することにより温度が高くな
った潤滑油は、スピンドル取付け機台３７とは分離して
設けられた排油配管４８を経て潤滑油タンク４２に還流
せしめることで、排出潤滑油の油温かスピンドル取付け
機台３７に及ぼす影響が少なくなり、その結果スピンド
ル取付け機台３７の熱変形が抑制され、ひいて：よスピ
ンドル２の熱変位に基づく加工精度の低下を防止するこ
とかできる。At this time, since the drain oil pipe 48 is separated and independent from the spindle mounting base 37, the amount of heat transferred from the discharged lubricating oil having a temperature higher than the air temperature to the spindle mounting base 37 is reduced. Thus, according to this embodiment, the lubricating oil whose temperature has increased by cooling and lubricating the inside of the spindle bearing device 1 is passed through the oil drain pipe 48 that is provided separately from the spindle mounting machine base 37. By circulating the lubricating oil into the lubricating oil tank 42, the influence of the oil temperature of the discharged lubricating oil on the spindle mounting machine base 37 is reduced, and as a result, thermal deformation of the spindle mounting machine base 37 is suppressed, and as a result: the heat of the spindle 2 is reduced. It is possible to prevent a decrease in machining accuracy due to displacement.
なお、潤滑油の給油経路４７に関しては、給油温度が気
温に制御されているから、スピンドル取付け機台３７内
を経由しても経由しなくても影響はない。Regarding the lubricating oil supply path 47, since the oil supply temperature is controlled by the air temperature, there is no effect whether the lubricating oil passes through the spindle mounting machine stand 37 or not.
また、スピンドル軸受装置１に形成された排油路２５の
出口２６は、できる限りスピンドル軸受装置１の前端寄
りに配置する、すなわちスピンドルから熱を奪い温度上
昇した潤滑油を、取付け機台３７から刀１れた位置から
排出するようにすれば、取付け機台３７例の潤滑油の温
度上昇は小さいから取付け機台３７の熱変位を小さくで
きる。In addition, the outlet 26 of the oil drain path 25 formed in the spindle bearing device 1 is arranged as close to the front end of the spindle bearing device 1 as possible. If the lubricating oil is discharged from the lower position, the temperature rise of the lubricating oil in the mounting machine base 37 is small, so the thermal displacement of the mounting machine base 37 can be reduced.
以上説明したように、本発明によれば、スピンドル軸受
装置に対する強制潤滑に際して、スピンドルの軸受を潤
滑することにより温度が上昇した潤滑油をスピンドル取
付け機台とは分離させた排油管路を介して排油するもの
とした。そのため、高温の排出油でスピンドル取付け機
台が熱変形する現象が抑制できて、スピンドルの熱変位
が小さくできるという効果が得られる。As explained above, according to the present invention, during forced lubrication of the spindle bearing device, the lubricating oil whose temperature has increased due to lubrication of the spindle bearing is transferred through the oil drain pipe separated from the spindle mounting machine base. The oil was to be drained. Therefore, it is possible to suppress the phenomenon in which the spindle mounting machine is thermally deformed due to high-temperature discharged oil, and it is possible to obtain the effect that the thermal displacement of the spindle can be reduced.
第１図は本発明の一実施例のスピントル軸受装置の縦断
面図、第２図はその潤滑システム系統図である。
図中、ｌはスピンドル軸受装置、２はスピンドル、３は
軸受、５はハウジング、２３は給油路、２５は排油路、
３７はスピンドル取付け機台、４８は排油配管。FIG. 1 is a longitudinal sectional view of a spindle bearing device according to an embodiment of the present invention, and FIG. 2 is a diagram of its lubrication system. In the figure, l is a spindle bearing device, 2 is a spindle, 3 is a bearing, 5 is a housing, 23 is an oil supply path, 25 is an oil drain path,
37 is the spindle mounting machine base, and 48 is the oil drain pipe.
Claims (2)
ングに、ハウジング外部から軸受部に到る給油路を設け
ると共に軸受部からハウジング外部に到る排油路を設け
、前記給油路を介して強制給油した潤滑油を前記排油路
を介して強制排油するようにしたスピンドル潤滑におい
て、 前記排油路を経て強制排油される潤滑油を前記スピンド
ルの取付け機台とは分離させた排油管路を介して吸引す
ることを特徴とするスピンドル潤滑における排油方法。(1) A housing that covers the outside of the bearing that supports the spindle is provided with an oil supply passage from the outside of the housing to the bearing, and an oil drainage passage from the bearing to the outside of the housing, and the oil is forced through the oil supply passage. In spindle lubrication in which the supplied lubricating oil is forcibly drained through the oil drain path, an oil drain pipe is provided in which the lubricating oil forcibly drained through the oil drain path is separated from the mounting machine base of the spindle. A method for draining oil in spindle lubrication, which is characterized by suctioning through a channel.
後端側が保持された前記ハウジングの先端部に接続され
たことを特徴とする請求項（１）記載のスピンドル潤滑
における排油方法。(2) The oil draining method for spindle lubrication according to claim (1), wherein the oil draining pipe is connected to a distal end portion of the housing whose rear end side is held on the mounting base of the spindle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30735189A JPH03166038A (en) | 1989-11-27 | 1989-11-27 | Method for discharging oil used for lubrication of spindle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30735189A JPH03166038A (en) | 1989-11-27 | 1989-11-27 | Method for discharging oil used for lubrication of spindle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03166038A true JPH03166038A (en) | 1991-07-18 |
Family
ID=17968058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30735189A Pending JPH03166038A (en) | 1989-11-27 | 1989-11-27 | Method for discharging oil used for lubrication of spindle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03166038A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5487631A (en) * | 1992-09-19 | 1996-01-30 | Systematic Drill Head Co. Ltd. | Machine tools |
-
1989
- 1989-11-27 JP JP30735189A patent/JPH03166038A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5487631A (en) * | 1992-09-19 | 1996-01-30 | Systematic Drill Head Co. Ltd. | Machine tools |
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