JPH05312657A - Wire tension measuring device - Google Patents
Wire tension measuring deviceInfo
- Publication number
- JPH05312657A JPH05312657A JP15995792A JP15995792A JPH05312657A JP H05312657 A JPH05312657 A JP H05312657A JP 15995792 A JP15995792 A JP 15995792A JP 15995792 A JP15995792 A JP 15995792A JP H05312657 A JPH05312657 A JP H05312657A
- Authority
- JP
- Japan
- Prior art keywords
- tension
- wire
- detection
- guides
- wire electrode
- 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
- Force Measurement Appropriate To Specific Purposes (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ワイヤカット放電加工
装置等に利用するワイヤ張力測定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire tension measuring device used in a wire cut electric discharge machine or the like.
【０００２】[0002]
【従来の技術】ワイヤカット放電加工用のワイヤ電極に
は線径０．０５〜０．３ｍｍの細線を用い、これをリー
ルから引出し、加工部を通過させながら移動させる。こ
の移動するワイヤ電極にはブレーキと引張り駆動ローラ
の作用によって所定の張力を加えているが、移動系には
常に急激な変化が発生して張力が変化し、ワイヤ電極が
振動したり断線したりするので、その検出制御が必要で
ある。従来のこのワイヤ電極の張力変動を検出する手段
としては、例えば２個のガイドローラ間に重りを掛けて
撓ませ、その撓み量の変化をポテンショメータとか差動
トランスによって検出し、この検出信号によってブレー
キとか駆動ローラを制御するものが知られている。この
場合の撓み量ｌは次式で与えられる。2. Description of the Related Art A fine wire having a wire diameter of 0.05 to 0.3 mm is used as a wire electrode for wire-cut electric discharge machining, which is pulled out from a reel and moved while passing through a machining section. A predetermined tension is applied to the moving wire electrode by the action of the brake and the tension driving roller.However, a sudden change always occurs in the moving system and the tension changes, and the wire electrode vibrates or is broken. Therefore, the detection control is necessary. As a conventional means for detecting the change in tension of the wire electrode, for example, a weight is applied between two guide rollers to bend the wire, and a change in the amount of the bend is detected by a potentiometer or a differential transformer. It is known to control drive rollers. The deflection amount l in this case is given by the following equation.
【０００３】[0003]
【数１】 [Equation 1]
【０００４】但し、Ｐは張力、Ｆは作用した力、Ｌはロ
ーラ間のスパンで、いまＰ＝８００ｇ，Ｆ＝１ｇ，Ｌ＝
１０ｃｍとしたときｌ＝０．０３ｍｍであり、この変化
を正確に検出することができない欠点があった。又、こ
の測定にはローラ等の質量とか力が加わって測定するの
で、検出の応答速度が極めて遅く、張力制御が遅れると
いった欠点があった。However, P is the tension, F is the acting force, and L is the span between the rollers, where P = 800 g, F = 1 g, L =
When 10 cm, l = 0.03 mm, and there was a drawback that this change could not be detected accurately. In addition, since this measurement is performed by adding a mass or force of a roller or the like, the response speed of detection is extremely slow and there is a drawback that the tension control is delayed.
【０００５】[0005]
【発明が解決しようとする課題】本発明はこのような欠
点を改善し、検出精度を高め、且つ検出応答速度の高い
検出により張力制御が常に精密に高応答で安定に制御で
きるようにすることを目的とする。SUMMARY OF THE INVENTION The present invention aims to remedy such drawbacks, improve the detection accuracy, and enable the tension control to be always precisely controlled with high response and stable by the detection with high detection response speed. With the goal.
【０００６】[0006]
【課題を解決するための手段】ガイド間を移動するワイ
ヤの振動数を光学的に非接触で検出する光学ヘッドと該
光学ヘッドの検出信号と設定条件から張力を演算出力す
る演算処理回路とを設けて成ることを特徴とする。An optical head for optically detecting the frequency of a wire moving between guides in a non-contact manner and an arithmetic processing circuit for arithmetically outputting a tension from a detection signal of the optical head and setting conditions. It is characterized by being provided.
【０００７】[0007]
【作用】本発明は前記のように、ワイヤの振動数を非接
触で光学的に検出し、これにより張力を演算出力するよ
うにしたので、従来の撓み量を接触検出するものに比較
して、高精度に且つ高速応答で検出することができ、こ
の検出による張力制御が精密に高応答で安定に制御でき
る。As described above, according to the present invention, the vibration frequency of the wire is optically detected in a non-contact manner, and the tension is calculated and output thereby. It is possible to detect with high precision and high speed response, and tension control based on this detection can be precisely controlled with high response and stably.
【０００８】[0008]
【実施例】以下、図面の一実施例により本発明を説明す
ると、図１はワイヤカット放電加工装置で、１はワイヤ
電極であり、巻回したリール２から供給される。ローラ
３はブレーキコイル４の制御によって所要のブレーキが
かけられる。５はワイヤ電極１を引張り駆動する駆動ロ
ーラで、モータ６の制御により駆動力が制御され、前記
ブレーキローラ３とのバランスにより移動するワイヤ電
極１に所要の張力が作用する。７及び８はワイヤ電極１
の振動を検出する部分の上下ガイドで、通常はこのガイ
ド間で図示しない被加工体の放電加工が行なわれる。９
は光学検出ヘッドで光照射系にはレーザー発振器を用
い、検出器には反射光とか透過光を光センサで検出し、
ワイヤ電極１の振動数ｆの検出を行なう。１０は検出信
号のフィルタで、雑音の除去を行ない、正信号を次のＣ
ＰＵ等の演算回路１１に供給する。演算回路１１は検出
信号と設定条件のデータ基準値とを所要の算式に入れて
張力を演算出力する。１３は張力信号による制御回路
で、ワイヤ電極１の張力が一定になるようブレーキコイ
ル４とか駆動モータ６に信号を加えて制御する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment of the drawings. FIG. 1 shows a wire-cut electric discharge machine, 1 is a wire electrode, which is supplied from a wound reel 2. A required brake is applied to the roller 3 by controlling the brake coil 4. A driving roller 5 pulls and drives the wire electrode 1. The driving force is controlled by the control of the motor 6, and a required tension acts on the moving wire electrode 1 by the balance with the brake roller 3. 7 and 8 are wire electrodes 1
The upper and lower guides of the portion for detecting the vibration are usually used for electrical discharge machining of a workpiece (not shown) between the guides. 9
Is an optical detection head and uses a laser oscillator for the light irradiation system, and the detector detects reflected light or transmitted light with an optical sensor,
The frequency f of the wire electrode 1 is detected. Reference numeral 10 is a filter for the detection signal, which removes noise and converts the positive signal to the next C
It is supplied to the arithmetic circuit 11 such as PU. The calculation circuit 11 puts the detection signal and the data reference value of the setting condition into a required formula to calculate and output the tension. Reference numeral 13 is a control circuit based on a tension signal, which controls by applying a signal to the brake coil 4 or the drive motor 6 so that the tension of the wire electrode 1 becomes constant.
【０００９】ガイド７，８間のワイヤ電極１の振動数ｆ
は次式で与えられる。Frequency f of the wire electrode 1 between the guides 7 and 8
Is given by
【００１０】[0010]
【数２】 [Equation 2]
【００１１】但し、ｎは振動次数、Ｌはガイド７，８間
の長さ（ｃｍ）、Ｐは張力（ｋｇ）、ｇは重力加速度９
８１ｃｍ／Ｓ２、ｒはワイヤ電極の単位長さ重量（ｋｇ
／ｃｍ）、 いま、Ｌ＝０ｃｍ、ワイヤ電極に０．２ｍ
ｍφのＣｕ線を用いたとき、ｎ＝１とすると、張力Ｐ＝
１ｋでｆ＝９３Ｈｚ，Ｐ＝１０ｋｇでｆ＝２８８Ｈｚ，
Ｐ＝１００ｇでｆ＝９．３Ｈｚとなる。このようにワイ
ヤ電極１の振動数ｆは、作用する張力Ｐの変化によって
Ｐに比例して変化する。これらの計算式等はメモリ１２
に記憶してある。そこで、このワイヤ電極１の振動、振
動数ｆの変化を光学検出ヘッド９で検出する。このヘッ
ド９による光学的検出はワイヤ電極１にレーザービーム
を照射し、その反射もしくは透過光を光センサで検出す
るが、検出信号がワイヤ電極１の振動数に対応して変化
し、容易に振動数ｆの検出測定をすることができる。し
かも、この検出測定精度は光の反射もしくは透過光によ
るから極めて測定精度が高く、且つ非接触の測定である
から応答が速く、この検出測定データを用いた張力制御
が正確に高応答で制御できる。検出信号はフィルタ１０
を通して雑音除去を行ない、信号を演算処理回路１１に
入力する。回路１１はメモリ１２から上記の張力計算式
及び条件設定による設定データ等を呼び出し、振動数５
の検出信号に対応する張力Ｐの演算を行ない、この演算
出力を制御回路１３に供給する。制御回路１３は入力す
る張力信号にもとづいて、ブレーキ４とか駆動モータ
６、もしくはその両方の制御により張力Ｐの制御を行な
う。However, n is the vibration order, L is the length (cm) between the guides 7 and 8, P is the tension (kg), and g is the gravitational acceleration 9.
81 cm / S 2 , r is the unit length weight of the wire electrode (kg
/ Cm), L = 0 cm, 0.2 m for wire electrode
When Cu wire of mφ is used and n = 1, tension P =
F = 93Hz at 1k, f = 288Hz at P = 10kg,
At P = 100 g, f = 9.3 Hz. Thus, the frequency f of the wire electrode 1 changes in proportion to P due to the change in the applied tension P. These calculation formulas are stored in the memory 12
I remember it. Therefore, the vibration of the wire electrode 1 and the change of the frequency f are detected by the optical detection head 9. In the optical detection by the head 9, the wire electrode 1 is irradiated with a laser beam, and the reflected or transmitted light is detected by an optical sensor. However, the detection signal changes corresponding to the frequency of the wire electrode 1 and easily vibrates. It is possible to make a few measurements of detection. In addition, the detection and measurement accuracy is extremely high because of the reflected or transmitted light, and the response is fast because it is a non-contact measurement, and the tension control using the detection and measurement data can be accurately controlled with high response. .. The detection signal is the filter 10
The noise is removed through and the signal is input to the arithmetic processing circuit 11. The circuit 11 calls the tension calculation formula and the setting data by the condition setting from the memory 12,
The tension P corresponding to the detection signal is calculated and the calculated output is supplied to the control circuit 13. The control circuit 13 controls the tension P by controlling the brake 4, the drive motor 6, or both based on the input tension signal.
【００１２】尚、前記の測定精度は張力Ｐが０．１ｋｇ
変化して振動数ｆが９．３Ｈｚ変化し、又、Ｐが１ｋｇ
変化するとｆ＝９３Ｈｚの変化をするから、これを光学
検出によって充分に正確に測定できる。これは従来の撓
み量を検出する場合μ単位の検出が高精度に正確にでき
なかったのに比較して極めて容易で正確であり、その応
答制御もμｓ単位で実行することができ、張力が常に一
定に制御でき、これによりワイヤ電極１の振動、断線を
少なく制御して安定した高精度、高速度の加工を行なう
ことができる。以上は本発明をワイヤカット放電加工に
利用した場合について説明したが、他のワイヤ駆動装置
のワイヤ張力測定装置として利用でき、移動するワイヤ
の張力自動制御に利用でき、又測定張力を表示して指示
を与えることができる。The above-mentioned measurement accuracy is such that the tension P is 0.1 kg.
Changes and the frequency f changes by 9.3 Hz, and P is 1 kg.
When it changes, it changes f = 93 Hz, which can be measured sufficiently accurately by optical detection. This is extremely easy and accurate in comparison with the conventional case in which the μ unit could not be detected with high precision and accuracy when detecting the amount of deflection, and the response control can also be executed in the μs unit, and the tension It can be controlled to be constant at all times, whereby vibration and disconnection of the wire electrode 1 can be controlled to be small, and stable high-precision and high-speed machining can be performed. The above has described the case where the present invention is applied to wire-cut electric discharge machining, but it can be used as a wire tension measuring device for other wire driving devices, can be used for automatic tension control of a moving wire, and can display the measured tension. Can give instructions.
【００１３】[0013]
【発明の効果】以上のように本発明は、ワイヤの振動数
を非接触で光学的に検出するようにしたので、従来の撓
み量を接触検出するものに比較して、高精度に且つ高速
応答で検出することができ、この検出にもとづいて設定
条件により張力を演算出力するから極めて正確な張力測
定ができ、又、これによる張力制御が精密に高応答で安
定に制御できる。従って、ワイヤカット放電加工に利用
した場合、加工部分においてワイヤ電極を常に一定の張
力で移動させることができ、これにより断線を防ぎ、よ
れ等をなくして緊張した状態で移動させ、アーク、短絡
等を発生させずに安定した加工ができ、加工精度及び加
工速度を向上させることができる。As described above, according to the present invention, the frequency of the wire is optically detected in a non-contact manner, so that it is more accurate and faster than the conventional method in which the deflection amount is detected by contact. It is possible to detect the response, and based on this detection, the tension is calculated and output based on the set conditions, so that the tension can be measured extremely accurately, and the tension control by this can be precisely controlled with high response and stably. Therefore, when used for wire-cut electric discharge machining, the wire electrode can always be moved with a constant tension in the machined part, thereby preventing wire breakage, moving in a tight state without twisting, arcing, short circuiting, etc. It is possible to perform stable processing without generating the above, and to improve processing accuracy and processing speed.
【図１】本発明の一実施例構成図。FIG. 1 is a configuration diagram of an embodiment of the present invention.
１ ワイヤ電極 ３ ブレーキローラ ４ ブレーキコイル ５ 引張り駆動ローラ ６ 駆動モータ ７，８ ガイド ９ 光学検出ヘッド １０ フィルタ １１ 演算処理回路 １２ メモリ １３ 制御回路 1 Wire Electrode 3 Brake Roller 4 Brake Coil 5 Tension Drive Roller 6 Drive Motor 7, 8 Guide 9 Optical Detection Head 10 Filter 11 Arithmetic Processing Circuit 12 Memory 13 Control Circuit
Claims (1)
ラによってガイド間を所定の張力を保つように制御しな
がら移動させるワイヤ駆動装置におけるワイヤ張力測定
装置であって、前記ガイド間を移動するワイヤの振動数
を光学的に非接触で検出する光学ヘッドと、該光学ヘッ
ドの検出信号と設定条件から張力を演算出力する演算処
理回路とを設けて成ることを特徴とするワイヤ張力測定
装置。1. A wire tension measuring device in a wire driving device for moving a fine wire while controlling it so as to maintain a predetermined tension between the guides by a brake and a pulling drive roller, wherein vibration of the wire moving between the guides. A wire tension measuring device comprising: an optical head for optically detecting the number in a non-contact manner; and an arithmetic processing circuit for arithmetically outputting the tension from a detection signal of the optical head and a setting condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15995792A JPH05312657A (en) | 1992-05-08 | 1992-05-08 | Wire tension measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15995792A JPH05312657A (en) | 1992-05-08 | 1992-05-08 | Wire tension measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05312657A true JPH05312657A (en) | 1993-11-22 |
Family
ID=15704870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15995792A Pending JPH05312657A (en) | 1992-05-08 | 1992-05-08 | Wire tension measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05312657A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998039128A1 (en) * | 1997-03-07 | 1998-09-11 | Sodick Co., Ltd. | System and method for wire cut discharge machining |
| WO1999044779A1 (en) * | 1998-03-04 | 1999-09-10 | Sodick Co., Ltd. | Wire-cut electric spark machining apparatus and method |
| EP2786825A2 (en) | 2013-04-02 | 2014-10-08 | Fanuc Corporation | Wire electric discharge machine having wire electrode tension control function |
| US20160263690A1 (en) * | 2015-03-06 | 2016-09-15 | Fanuc Corporation | Wire electric discharge machine having function to correct detected value of tensile force |
| WO2021193323A1 (en) * | 2020-03-24 | 2021-09-30 | ファナック株式会社 | Estimation method and control device for wire electrical discharge machine |
-
1992
- 1992-05-08 JP JP15995792A patent/JPH05312657A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998039128A1 (en) * | 1997-03-07 | 1998-09-11 | Sodick Co., Ltd. | System and method for wire cut discharge machining |
| US6028282A (en) * | 1997-03-07 | 2000-02-22 | Sodick Co., Ltd. | System and method for wire cut discharge machining |
| CN1099933C (en) * | 1997-03-07 | 2003-01-29 | 沙迪克株式会社 | Apparatus and method for wire cut discharge machining |
| WO1999044779A1 (en) * | 1998-03-04 | 1999-09-10 | Sodick Co., Ltd. | Wire-cut electric spark machining apparatus and method |
| US6326577B1 (en) | 1998-03-04 | 2001-12-04 | Sodick Co., Ltd. | Wire cutting electrical discharge device and method for same |
| CN1110397C (en) * | 1998-03-04 | 2003-06-04 | 沙迪克株式会社 | Wire-cut electric spark machining apparatus and method |
| EP2786825A2 (en) | 2013-04-02 | 2014-10-08 | Fanuc Corporation | Wire electric discharge machine having wire electrode tension control function |
| US20160263690A1 (en) * | 2015-03-06 | 2016-09-15 | Fanuc Corporation | Wire electric discharge machine having function to correct detected value of tensile force |
| US10105776B2 (en) * | 2015-03-06 | 2018-10-23 | Fanuc Corporation | Wire electric discharge machine having function to correct detected value of tensile force |
| WO2021193323A1 (en) * | 2020-03-24 | 2021-09-30 | ファナック株式会社 | Estimation method and control device for wire electrical discharge machine |
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