JPH06213735A - Torque detector for rotary load - Google Patents
Torque detector for rotary loadInfo
- Publication number
- JPH06213735A JPH06213735A JP2202393A JP2202393A JPH06213735A JP H06213735 A JPH06213735 A JP H06213735A JP 2202393 A JP2202393 A JP 2202393A JP 2202393 A JP2202393 A JP 2202393A JP H06213735 A JPH06213735 A JP H06213735A
- Authority
- JP
- Japan
- Prior art keywords
- torque
- load
- magnetostrictive
- rotary
- drill
- 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
Landscapes
- Machine Tool Sensing Apparatuses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ボールねじやドリルの
ような回転工具等の回転負荷体に作用するトルクの検出
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting a torque acting on a rotary load such as a rotary tool such as a ball screw or a drill.
【０００２】[0002]
【従来の技術】従来、例えば、回転工具の負荷トルクを
検出するものとして、回転工具を取りつけるスピンドル
に磁歪式トルクセンサを取り付けて負荷トルクを検出
し、スピンドルの負荷トルクから間接的に回転工具の負
荷トルクを検出するものがある（例えば、特開昭６４−
１６３４９号）。また、送り装置に使用したボールねじ
の負荷トルクを検出するものとして、ボールねじの駆動
モータの回転軸に磁歪式トルクセンサを取り付けて回転
軸の負荷トルクを検出し（例えば、特開平２−２６４８
３６号）、回転軸の負荷トルクから間接的にボールねじ
の負荷トルクを算出する方法がある。2. Description of the Related Art Conventionally, for example, in order to detect the load torque of a rotary tool, a magnetostrictive torque sensor is attached to a spindle on which the rotary tool is mounted to detect the load torque, and the load torque of the spindle is indirectly used to detect the load torque of the rotary tool. There is one that detects the load torque (for example, Japanese Patent Laid-Open No. 64-64-
16349). Further, to detect the load torque of the ball screw used in the feeder, a magnetostrictive torque sensor is attached to the rotary shaft of the drive motor of the ball screw to detect the load torque of the rotary shaft (for example, Japanese Patent Laid-Open No. 2-2648).
No. 36), there is a method of indirectly calculating the load torque of the ball screw from the load torque of the rotating shaft.
【０００３】[0003]
【発明が解決しようとする課題】ところが、上記のよう
に、スピンドルに取りつけた磁歪式トルクセンサによっ
て、スピンドルに取りつけた回転工具の負荷トルクを間
接的に検出する構成では、一般にスピンドルの径が回転
工具の径より大きく、負荷トルクによって生じる応力が
径の３乗に反比例するため、例えばスピンドルの径が回
転工具の径の２倍あったとすると、スピンドルに設けた
トルクセンサによって検出したトルク検出値は、回転工
具に換算すると１／８になり、検出精度が低くなる。ま
た、感度を８倍にすると、ノイズも８倍になり、検出精
度を上げるためには複雑な装置が必要となるなどの問題
があった。また、ボールねじのトルクを検出する場合も
同様に、モータの回転軸の径とボールねじの径に差があ
るときは、検出精度が低下すると言う問題があった。本
発明は、直接回転負荷体の負荷トルクを検出して検出精
度を高めることを目的とするものである。However, as described above, in the configuration in which the load torque of the rotary tool attached to the spindle is indirectly detected by the magnetostrictive torque sensor attached to the spindle as described above, the diameter of the spindle generally rotates. Since the stress generated by the load torque is larger than the diameter of the tool and is inversely proportional to the cube of the diameter, for example, if the diameter of the spindle is twice the diameter of the rotating tool, the torque detection value detected by the torque sensor provided on the spindle is When converted to a rotary tool, it becomes 1/8, and the detection accuracy becomes low. Further, if the sensitivity is increased by a factor of eight, noise is also increased by a factor of eight, and there is a problem that a complicated device is required to improve the detection accuracy. Also, when detecting the torque of the ball screw, similarly, there is a problem that the detection accuracy is reduced when there is a difference between the diameter of the rotating shaft of the motor and the diameter of the ball screw. It is an object of the present invention to directly detect the load torque of a rotary load and improve the detection accuracy.
【０００４】[0004]
【課題を解決するための手段】本発明は、回転負荷体の
径より大きい径の駆動部によって駆動される前記回転負
荷体のトルク検出装置において、前記回転負荷体の外周
に設けた磁歪部と、前記磁歪部の磁気歪みに基づくイン
ピーダンス変化を検出する検出コイルと、前記検出コイ
ルの出力を入力とするトルク測定装置とを備えたもので
ある。According to the present invention, in a torque detecting device for a rotating load body driven by a driving portion having a diameter larger than that of the rotating load body, a magnetostrictive portion provided on the outer circumference of the rotating load body is provided. A detection coil that detects an impedance change based on the magnetostriction of the magnetostrictive portion, and a torque measuring device that receives an output of the detection coil as an input.
【０００５】[0005]
【作用】回転負荷体の外周に磁歪部を設けて回転負荷体
に作用する応力を直接負荷トルクとして検出するので、
回転負荷体の径より大きい駆動部の外周表面に設けた磁
歪部によってトルクを検出する場合に比較すると、負荷
トルクによって生じる応力が径の３乗に反比例するた
め、回転負荷体と駆動部の径の割合の３乗の高い精度で
負荷トルクを検出することができる。[Operation] Since the magnetostrictive portion is provided on the outer circumference of the rotary load body and the stress acting on the rotary load body is directly detected as the load torque,
Compared to the case where torque is detected by the magnetostrictive portion provided on the outer peripheral surface of the drive unit, which is larger than the diameter of the rotary load body, the stress generated by the load torque is inversely proportional to the cube of the diameter. The load torque can be detected with a high accuracy of the third power of the ratio.
【０００６】[0006]
【実施例】本発明を図に示す実施例について説明する。
図１は本発明をボール盤に取りつけたドリルに適用した
実施例の側断面図で、ゴール盤本体１に設けた回転する
スピンドル２の先端に、コレットチャック３を取り付け
てドリル４をクランプするようにしてある。コレットチ
ャック３の外側に出るドリル４の表面には、蒸着等の方
法により磁歪膜からなる磁歪部５を設けてある。磁歪部
５に対向するように、検出コイル６がボール盤本体１等
の固定部分に支持体７によって支持され、検出コイル６
からの出力はトルク測定装置８に入力されるようにして
ある。ドリル４を加工物に当てて負荷を加えると、ドリ
ル４に生じる応力により磁歪部５に磁気歪みが生じ、検
出コイル６によって磁気歪みに基づくインピーダンス変
化の変化量を検出して、その出力をトルク測定装置８に
入力することにより、ドリル４の負荷トルクを演算によ
って求める。したがって、ドリル４の応力を直接検出す
ることにより、負荷トルクを検出するので、ドリル４の
径より大きい工具回転部のスピンドル２の外周表面に設
けた磁歪部によってトルクを検出する場合に比較して、
高い精度で検出することができる。図２はボールねじを
使用した送り装置に適用した実施例の側断面図で、モー
タ９によって駆動されるボールねじ１０には、テーブル
１１がねじ嵌合しており、ボールねじ１０のねじ部１２
とモータ９との結合部１３との間に磁歪部５を設け、磁
歪部５に対向するように、検出コイル６を設けてあり、
検出コイル６からの出力はトルク測定装置８に入力され
るようにしてある。モータ９によってテーブル１１を移
動すると、ボールねじ１０に負荷が加わるが、ボールね
じ１０の応力により磁歪部５に磁気歪みに基づくインピ
ーダンス変化が生じ、検出コイル６によってその変化量
を検出することにより、ボールねじ１０に生じる負荷ト
ルクを検出することができる。このように、スピンドル
２やモータ９の軸のような駆動部の径が、ドリル４やボ
ールねじ１０のような回転負荷体の径より大きい場合、
回転負荷体の外周に直接磁歪部を設けて回転負荷体の負
荷トルクを検出するので、径の違いによる検出精度の低
下はなくなる。また、磁歪部を負荷の作用する部分の近
くに設けることによって、他の負荷の要因が混入するこ
とがなくなり、負荷トルクの検出精度をさらに高めるこ
とができる。また、回転負荷体の材質をマルエージング
鋼（例えば、１７〜１９％Ｎｉ、０．３〜０．７％Ｔ
ｉ、０．０５〜０．１５％Ａｌ、７〜８．５％Ｃｏ、
４．５〜５．１％Ｍｏの合金鋼をマルエージング処理し
たもの）とすると、負荷トルクにより負荷体の全表面に
磁歪が発生するので、磁歪部を蒸着などによる磁歪膜で
形成する必要がなく、回転負荷体に対向させる検出コイ
ルの位置を任意に選ぶことができる。また、回転負荷体
の負荷トルクを検出する部分に、マルエージング鋼から
なるリング状磁歪部材を締まり嵌め等によって一体にな
るように取りつけて、検出コイルを対向させるようにし
てもよい。この場合、例えば長尺のねじのように、磁歪
膜の蒸着作業が困難な形状の回転負荷体でも負荷トルク
を直接検出することができる。Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view of an embodiment in which the present invention is applied to a drill mounted on a drilling machine. A collet chuck 3 is attached to the tip of a rotating spindle 2 provided on a goal board main body 1 to clamp the drill 4. There is. A magnetostrictive portion 5 made of a magnetostrictive film is provided on the surface of the drill 4 protruding outside the collet chuck 3 by a method such as vapor deposition. The detection coil 6 is supported by a support 7 on a fixed portion of the drilling machine body 1 or the like so as to face the magnetostrictive portion 5, and
The output from is input to the torque measuring device 8. When the drill 4 is applied to the workpiece and a load is applied, a magnetostriction occurs in the magnetostrictive portion 5 due to the stress generated in the drill 4, and the detection coil 6 detects the amount of change in impedance change based on the magnetic strain, and outputs the torque. By inputting into the measuring device 8, the load torque of the drill 4 is calculated. Therefore, since the load torque is detected by directly detecting the stress of the drill 4, as compared with the case where the torque is detected by the magnetostrictive portion provided on the outer peripheral surface of the spindle 2 of the tool rotating portion that is larger than the diameter of the drill 4. ,
It can be detected with high accuracy. FIG. 2 is a side sectional view of an embodiment applied to a feeding device using a ball screw. A table 11 is screw-fitted to a ball screw 10 driven by a motor 9, and a screw portion 12 of the ball screw 10 is provided.
The magnetostrictive portion 5 is provided between the motor and the coupling portion 13 of the motor 9, and the detection coil 6 is provided so as to face the magnetostrictive portion 5.
The output from the detection coil 6 is input to the torque measuring device 8. When the table 11 is moved by the motor 9, a load is applied to the ball screw 10. However, the stress of the ball screw 10 causes an impedance change in the magnetostrictive portion 5 due to the magnetostriction, and the detection coil 6 detects the amount of change in impedance. The load torque generated in the ball screw 10 can be detected. In this way, when the diameter of the drive unit such as the spindle 2 or the shaft of the motor 9 is larger than the diameter of the rotary load such as the drill 4 or the ball screw 10,
Since the magnetostrictive portion is directly provided on the outer circumference of the rotary load body to detect the load torque of the rotary load body, the detection accuracy does not decrease due to the difference in diameter. Further, by providing the magnetostrictive portion near the portion on which the load acts, it is possible to prevent other load factors from being mixed in, and to further improve the load torque detection accuracy. Further, the material of the rotary load is made of maraging steel (for example, 17 to 19% Ni, 0.3 to 0.7% T).
i, 0.05 to 0.15% Al, 7 to 8.5% Co,
When 4.5 to 5.1% Mo alloy steel is maraging-treated), magnetostriction occurs on the entire surface of the load body due to the load torque. Therefore, it is necessary to form the magnetostrictive portion with a magnetostrictive film by vapor deposition or the like. Instead, the position of the detection coil facing the rotary load can be arbitrarily selected. In addition, a ring-shaped magnetostrictive member made of maraging steel may be integrally attached to a portion of the rotating load body that detects the load torque by interference fitting so that the detection coils face each other. In this case, the load torque can be directly detected even with a rotary load body having a shape in which it is difficult to deposit the magnetostrictive film, such as a long screw.
【０００７】[0007]
【発明の効果】以上述べたように、本発明によれば、回
転負荷体の駆動部の径が、回転負荷体である回転負荷体
の径より大きい場合、回転負荷体の外周に直接磁歪部を
設けてトルクを検出するので、駆動部と回転負荷体との
径の違いによる検出精度の低下は無く、回転負荷体の負
荷トルクを高い検出精度で検出することができる効果が
ある。As described above, according to the present invention, when the diameter of the driving portion of the rotary load body is larger than the diameter of the rotary load body which is the rotary load body, the magnetostrictive portion is directly provided on the outer circumference of the rotary load body. Since the torque is detected by providing the above, the detection accuracy does not decrease due to the difference in diameter between the drive unit and the rotary load body, and the load torque of the rotary load body can be detected with high detection accuracy.
【図１】本発明の実施例を示す側断面図である。FIG. 1 is a side sectional view showing an embodiment of the present invention.
【図２】本発明の他の実施例を示す側断面図である。FIG. 2 is a side sectional view showing another embodiment of the present invention.
１ ボール盤本体 ２ スピンドル ３ コレットチャック ４ ドリル ５ 磁歪部 ６ 検出コイル ７ 支持体 ８ トルク測定装置 ９ モータ １０ ボールねじ １１ テーブル 1 Drilling Machine Main Body 2 Spindle 3 Collet Chuck 4 Drill 5 Magnetostrictive Part 6 Detection Coil 7 Support 8 Torque Measuring Device 9 Motor 10 Ball Screw 11 Table
Claims (6)
よって駆動される前記回転負荷体のトルク検出装置にお
いて、前記回転負荷体の外周に設けた磁歪部と、前記磁
歪部の磁気歪みに基づくインピーダンス変化を検出する
検出コイルと、前記検出コイルの出力を入力とするトル
ク測定装置とを備えたことを特徴とする回転負荷体のト
ルク検出装置。1. A torque detection device for a rotating load body driven by a driving unit having a diameter larger than that of the rotating load body, wherein a magnetostrictive portion provided on an outer circumference of the rotating load body and a magnetostrictive portion of the magnetostrictive portion are provided. A torque detecting device for a rotating load, comprising: a detection coil for detecting an impedance change based on the torque; and a torque measuring device for receiving an output of the detection coil as an input.
記載の回転負荷体のトルク検出装置。2. The magnetostrictive portion is formed of a magnetostrictive film.
A torque detecting device for a rotating load as described.
備える代わりに、前記回転負荷体の材質をマルエージン
グ鋼として前記磁歪部を形成した請求項１記載の回転負
荷体のトルク検出装置。3. The torque detecting device for a rotary load body according to claim 1, wherein the magnetostrictive portion is formed by using maraging steel as a material of the rotary load body instead of including the magnetostrictive portion provided on the outer periphery of the rotary load body. .
部材で構成した請求項１記載の回転負荷体のトルク検出
装置。4. The torque detecting device for a rotating load according to claim 1, wherein the magnetostrictive portion is made of a member made of maraging steel.
部であるスピンドルに取りつけられた回転工具である請
求項１または３記載の回転負荷体のトルク検出装置。5. The torque detecting device for a rotary load body according to claim 1, wherein the rotary load body is a rotary tool attached to a spindle that is a tool rotating portion of a machine tool.
るモータに連結されたねじである請求項１または３記載
の回転負荷体のトルク検出装置。6. The torque detecting device for a rotary load according to claim 1, wherein the rotary load is a screw connected to a motor that is a drive unit of the feeding device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2202393A JPH06213735A (en) | 1993-01-13 | 1993-01-13 | Torque detector for rotary load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2202393A JPH06213735A (en) | 1993-01-13 | 1993-01-13 | Torque detector for rotary load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06213735A true JPH06213735A (en) | 1994-08-05 |
Family
ID=12071392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2202393A Pending JPH06213735A (en) | 1993-01-13 | 1993-01-13 | Torque detector for rotary load |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06213735A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002016804A1 (en) * | 2000-08-21 | 2002-02-28 | Toshiaki Shimada | Drive shaft moving device |
-
1993
- 1993-01-13 JP JP2202393A patent/JPH06213735A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002016804A1 (en) * | 2000-08-21 | 2002-02-28 | Toshiaki Shimada | Drive shaft moving device |
| US6968752B2 (en) | 2000-08-21 | 2005-11-29 | Toshiaki Shimada | Drive shaft moving device |
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