JPH02180520A - Previewing device for edge chip of circular cutting tool - Google Patents
Previewing device for edge chip of circular cutting toolInfo
- Publication number
- JPH02180520A JPH02180520A JP5965589A JP5965589A JPH02180520A JP H02180520 A JPH02180520 A JP H02180520A JP 5965589 A JP5965589 A JP 5965589A JP 5965589 A JP5965589 A JP 5965589A JP H02180520 A JPH02180520 A JP H02180520A
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- Japan
- Prior art keywords
- signal
- blade
- circular
- alarm
- threshold value
- 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
Links
- 230000002950 deficient Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Landscapes
- Accessories And Tools For Shearing Machines (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Machine Tool Sensing Apparatuses (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
この発明は円形刃物の刃欠予知装置に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus for predicting the chipping of a circular blade.
［従来技術］
鋼板製造に際して巾を整えるために通常第５図に示すよ
うなトリマ装置（円形刃物の一種で、鋼板の巾方向端部
を剪断する装置）が用いられる。[Prior Art] In order to trim the width of a steel plate, a trimmer device (a type of circular blade, which shears the ends of the steel plate in the width direction) as shown in FIG. 5 is usually used.
これは上刃と下刃とで鋼板Ｘをはさみ剪断することによ
って両端の余分なところを除去する。−最には円形の回
転刃で連続的にトリミングし、屑はチョッパ５１で適当
な長さに細断し、処理する。This is done by sandwiching and shearing the steel plate X between an upper blade and a lower blade, thereby removing excess parts at both ends. -Finally, it is continuously trimmed with a circular rotary blade, and the scraps are chopped into appropriate lengths with a chopper 51 and disposed of.
従来より、このトリマ５０の刃先が欠け、鋼板Ｘの剪断
面にパリ（凹凸の剪断荒れ）が発生し格落ちとなる問題
があった。Conventionally, there has been a problem that the cutting edge of the trimmer 50 is chipped and a crack (uneven shear roughness) occurs on the sheared surface of the steel plate X, resulting in a downgrade.
トリマの刃−欠けは、従来検査マンによる目視チエツク
が行われていたが、ラインスピードが高速であることに
加えて連続して常時監視する必要があることから、疲労
等による見落としは免かれず、気が付いたときには多量
の欠陥が発生していたというケースが殆どであった。Trimmer blades were previously visually checked by inspection personnel, but due to the high line speed and the need for continuous constant monitoring, oversights due to fatigue, etc. are inevitable. In most cases, a large number of defects had occurred by the time they were noticed.
このため刃欠はセンサとして、光学式距離計を用いトリ
マ刃先の凹凸を距離として検出し、所定の大きさ以上の
刃欠けを検出して、これに基づいて警報を発する装置を
使用していた。（特開昭６３−８１２０４号公報）
［発明が解決しようとする課題］
しかしながら、光学式距離計を用いたトリマの刃欠は検
出装置は、刃面の変色または油汚れにより光が散乱する
ためノイズが発生し、目的とする刃欠は信号の検出が感
度よく検出されない虞があった。For this reason, an optical distance meter was used as a sensor to detect the unevenness of the trimmer blade edge, and a device was used to detect blade chips larger than a predetermined size and issue an alarm based on this. . (Japanese Unexamined Patent Publication No. 63-81204) [Problems to be Solved by the Invention] However, a device for detecting a chipped trimmer blade using an optical range finder cannot detect the chipped blade of a trimmer because light is scattered due to discoloration or oil stains on the blade surface. Noise was generated, and there was a risk that the signal could not be detected with sufficient sensitivity to detect the desired blade chipping.
本発明はかかる事情に鑑みてなされたもので、有効な刃
欠は信号を精度よく検出できる円形刃物の刃欠予知装置
を提供しようとするものである。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a blade chipping prediction device for circular blades that can accurately detect signals for effective blade chipping.
［課題を解決するための手段］
前記問題点は、円形刃物の刃先の凹凸を検出する渦流式
距離計と、該渦流式距離計から入力される凹凸信号の変
化分を検出する装置と、該検出された変化分と予め設定
された凹凸の変化分の閾値とを比較し、該検出値が閾値
を超えたとき刃欠は信号を出力する装置とを有すること
を特徴とする円形刃物の刃欠予知装置により解決される
。[Means for Solving the Problem] The above problem is solved by an eddy current distance meter that detects the unevenness of the cutting edge of a circular knife, a device that detects a change in the unevenness signal input from the eddy current distance meter, A blade for a circular cutter, characterized in that it has a device that compares a detected change with a preset threshold for a change in unevenness and outputs a signal when the detected value exceeds the threshold. This problem can be solved by a failure prediction device.
また、前記刃欠予知装置において、渦流式距離計から入
力される凹凸信号中の該円形刃物の刃欠信号と焼き付き
信号を弁別する回路を備えることにより、信頼性が向上
する。Further, the reliability of the blade chipping prediction device is improved by including a circuit that discriminates between a chipping signal and a burn-in signal of the circular blade in the unevenness signal inputted from the eddy current distance meter.
さらに、検出した刃欠は信号の周期が刃物の回転周期と
複数回連続して一致したときのみ真の刃欠けと判断する
回路を備えることにより、信頼性が更に向上する。Furthermore, reliability is further improved by providing a circuit that determines that a detected blade chip is a true blade chip only when the period of the signal coincides with the rotation period of the cutter a plurality of times in succession.
渦流式距離計を、円形刃物の刃先より円形刃物の回転軸
に対してほぼ４５度の方向に、３〜５關の間隔をもって
位置せしめることにより、保守性に優れ、信号レベルが
向上する。By positioning the eddy current distance meter in a direction approximately 45 degrees from the cutting edge of the circular cutter with respect to the rotational axis of the circular cutter and at an interval of 3 to 5 degrees, maintainability is excellent and the signal level is improved.
Ｅ作用コ
本発明における円形刃物の刃欠予知装置は、渦流式距離
計によって、円形刃物の刃先の形状を把握し、該形状信
号を信号処理して、予め定めた閾値と比較して、信号の
値が製品に被害をもたらす場合にオペレーターに警告を
発する。E-Function The device for predicting the chipping of a circular blade according to the present invention grasps the shape of the cutting edge of a circular blade using an eddy current distance meter, processes the shape signal, compares it with a predetermined threshold value, and calculates a signal. Alerts the operator if the value of is harmful to the product.
刃欠は信号と焼き付き信号を弁別することにより、無害
な焼き付き信号を除去し、有害な刃欠は信号のみを取り
出すことができる。By distinguishing between the signal and burn-in signal, the harmless burn-in signal can be removed, and only the signal from the harmful signal can be extracted.
また、刃欠は信号の周期が刃物の回転周期と複数回連続
して一致したときのみ真の刃欠けと判断する回路を備え
ることにより、回転と同期しないランダムノイズを除去
することができる。In addition, by providing a circuit that determines that a chipped blade is a true chipped blade only when the period of the signal coincides with the rotational period of the cutter several times in succession, random noise that is not synchronized with the rotation can be removed.
渦流式距離計の位置を限定した理由は、以下の通りであ
る。The reason for limiting the location of the eddy current distance meter is as follows.
円形刃物の刃先は焼付き疵が発生することがあり、この
ため、渦流式距離計は該刃物から被害を回避する位置に
配設しなければならない、また渦流式距離計が刃先の形
状を把握するためには、測定感度の観点から上限がある
０円形刃物における作業の特質から、渦流式距離計と円
形刃物の間隔を３〜５ ＠ＩＩに採れば、測定感度を満
足し、渦流式距離計が被害を蒙ることはない、また円形
刃物は定期的に交換する必要があるので、その支障とな
らないように、該渦流式距離計を円形刃物の刃先より、
円形刃物の回転軸に対してほぼ４５度の方向に位置せし
めた。The cutting edge of a circular knife may develop seizure flaws, so the eddy current rangefinder must be placed in a position to avoid damage from the cutting tool. In order to do this, there is an upper limit from the viewpoint of measurement sensitivity.Due to the characteristics of work with a circular knife, if the distance between the eddy current distance meter and the circular knife is set to 3 to 5 @II, the measurement sensitivity will be satisfied and the eddy current distance The eddy current rangefinder should not be placed near the cutting edge of the circular knife so that the meter will not be damaged and the circular knife needs to be replaced periodically.
It was positioned at approximately 45 degrees to the rotation axis of the circular cutter.
［実施例コ
以下、添付の図面を参照しながら本発明の実施例を詳細
に説明する。[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
（実施例１）
第１図は円形刃物の刃欠は検出装置のブロック図で、円
形刃物の刃先５０１の刃欠けによる凹凸を距離として検
出する渦流式距離計１を備えている。距離計１にはアン
プ１０を介して微分回路２が接続され、ここで凹凸信号
の変化分を検出する。これは刃自体の取付は不良に起因
する信号を除去するためである。微分回路にかえて高域
通過フィルタ等を用いてもよい、微分回路２からの出力
は判定回路３に送られる４回路３には予め変化分の閾値
が設定されており、この闇値と変化分信号とを比較し、
閾値を超えれば刃欠は信号を出力する。この実施例では
刃欠は信号の回数をカウントシ、所定数ｎになったら刃
欠は発生と判断している。この判断信号はアラーム４に
送信され、警報を発生するようになっている。(Embodiment 1) FIG. 1 is a block diagram of a chip detection device for a circular cutter, which is equipped with an eddy current distance meter 1 that detects as a distance unevenness caused by a chip on the cutting edge 501 of a circular cutter. A differentiation circuit 2 is connected to the distance meter 1 via an amplifier 10, and detects a change in the unevenness signal. This is because the installation of the blade itself eliminates signals caused by defects. A high-pass filter or the like may be used instead of the differentiating circuit.The output from the differentiating circuit 2 is sent to the judgment circuit 3.4 The threshold value for the change is set in advance in the circuit 3, and this dark value and the change are Compare with the minute signal,
If the threshold is exceeded, the blade will output a signal. In this embodiment, a chipped blade is determined by counting the number of signals, and when a predetermined number n is reached, a chipped blade is determined to have occurred. This judgment signal is sent to the alarm 4 to generate an alarm.
第２図に本発明による装置によって得られたデータを示
す、第２図が刃欠は検出の結果である。刃欠は検出事例
では、円周１ケ所に深さ０．５１１ｍの欠けがあったも
のであるが、刃１回転毎に明瞭な凹凸信号が検出されて
おり、予め設定した闇値を超え警報を発したものである
。実機においては突発的なノイズが入る可能性がるため
、閾値を超えて直ちに発報するのではなくてたとえば前
記閾値を３回を超えたら警報を発するなどの工夫をして
いる。また、この警報信号によりラインを自動停止させ
ることも可能である。また、第２図の刃の振れ回り信号
により、機械系のガタ、刃の取り付けおよび摩耗状層を
定量的に把握することも可能である。FIG. 2 shows the data obtained by the device according to the invention, and FIG. 2 shows the results of the detection of blade defects. In the case of the detected blade chip, there was a chip with a depth of 0.511 m at one location on the circumference, but a clear unevenness signal was detected every time the blade rotated, and the darkness value exceeded the preset value and an alarm was issued. This is what was emitted. In actual equipment, there is a possibility that sudden noise may occur, so instead of issuing an alarm immediately when the threshold value is exceeded, measures are taken to issue an alarm when the threshold value is exceeded, for example, three times. It is also possible to automatically stop the line using this alarm signal. Furthermore, it is also possible to quantitatively grasp mechanical backlash, blade attachment, and worn layers using the blade whirling signal shown in FIG. 2.
（実施例２）
第３図は渦流式距離計の配設状況を示す説明図である６
ｗ４板Ｘは上下一対の円形刃物５０１によって剪断され
、渦流式距離計Ｉは円形刃物の刃先２０１より３ｆＩｆ
ｆｉの間隔で、円形刃物の回転軸に対して４５度の方向
に設置されている。第４図は信号処理回路を備えた本発
明の一実施例を示すブロック図である。渦流式距離計１
より収り込んだ信号には、亀裂、刃欠、および焼き付き
等の信号に加えて、円形刃物の偏心も含まれるので、バ
イパスフィルター１４によって偏心の影響を除去する。(Example 2) Fig. 3 is an explanatory diagram showing the arrangement situation of the eddy current distance meter6
The w4 plate
They are installed at an interval of fi at a direction of 45 degrees with respect to the rotation axis of the circular cutter. FIG. 4 is a block diagram showing an embodiment of the present invention including a signal processing circuit. Eddy current distance meter 1
Since the more convergent signal includes the eccentricity of the circular cutter in addition to signals such as cracks, chipped edges, and burn-in, the influence of eccentricity is removed by the bypass filter 14.
亀裂および刃欠の最初の信号の符号は正であり、焼き付
きの場合は負であるが、全ての正信号は半波整流回路１
５によって、また全ての負信号は半波整流回路１７によ
ってそれぞれ弁別する。The sign of the first signal for cracks and chipping is positive, for burn-in it is negative, but all positive signals are connected to half-wave rectifier circuit 1.
5 and all negative signals are discriminated by a half-wave rectifier circuit 17, respectively.
これらの処理された信号はそれぞれ包絡線処理回路１６
．１８によって時間中を拡大される。これらの正負信号
は差し引き回路２０によって差し引き演算および半波整
流が行われ、亀裂および刃欠の最初の信号のみが出力さ
れる。また負の信号の包絡線処理において、正の信号の
包絡線処理におけるよりも時定数を大きく採っているの
で、その他の負信号は消滅され、焼き付き信号は生じな
い、この時定数の設定に際して、必要な信号のみを取り
出すために、円形刃物の回転数によって演算器２４は時
定数を決定して、時定数調整回路１つによってこれを調
整する。回転計１３よりの信号は、増幅器２２を経由し
て、一つはパルス成形回路２３に入力される。この回路
は、ライン停止時の誤動作を防止する為に設置されてい
る。Each of these processed signals is sent to an envelope processing circuit 16.
．． Expanded in time by 18. These positive and negative signals are subjected to subtraction calculations and half-wave rectification by a subtraction circuit 20, and only the first signals of cracks and blade chips are output. In addition, in the envelope processing of negative signals, a larger time constant is used than in the envelope processing of positive signals, so other negative signals are eliminated and no burn-in signal occurs.When setting this time constant, In order to extract only the necessary signals, the computing unit 24 determines a time constant based on the rotational speed of the circular cutter, and adjusts this using one time constant adjustment circuit. One signal from the tachometer 13 is input to a pulse shaping circuit 23 via an amplifier 22 . This circuit is installed to prevent malfunctions when the line is stopped.
また一つは、該演算器に入力され前述の時定数を決定す
る。前述の処理された亀裂および刃欠の最初の信号は、
比較アンプ２１に入力され予め定められな閾値と比較さ
れて、これを超えた信号が演算器に送られ、前述の回転
計よりの信号を利用して、刃物の回転周期に同期した信
号が５回以上発生した場合に、警報機２５によって警報
を発し、また記録計２６によって記録する０以上の構成
を有する装置により円形刃物の剪断刃欠けの検出が精度
よく行われ、従来１ライン当たり約２０コイル／月発生
していた格落ちが殆ど皆無となりた。The other is input to the arithmetic unit and determines the above-mentioned time constant. The first signals of treated cracks and chipping mentioned above are:
The signal is input to the comparison amplifier 21 and compared with a predetermined threshold value, and the signal exceeding this is sent to the arithmetic unit. Using the signal from the tachometer mentioned above, a signal synchronized with the rotation period of the cutter is If the chipping occurs more than once, an alarm is issued by the alarm 25, and a recorder 26 records the chipping.The detection of chipped shearing blades of circular blades is performed with high accuracy using a device having a configuration of 0 or more. The downgrades that occurred in coils/month have almost completely disappeared.
［発明の効果］
本発明によれば、ｉｌ１％流式距離計を用いて刃先まで
の距離を検出し、さらに無駄な信号をカットするように
しであるので、精度よく効果的な刃欠は信号をキャッチ
することができる。また、これによってパリ発生による
格落ちをほぼゼロとすることができ、生産効率の向上を
図ることができる。[Effects of the Invention] According to the present invention, the distance to the cutting edge is detected using an il 1% flow distance meter, and unnecessary signals are further cut. can be caught. Moreover, this makes it possible to reduce downgrades due to the occurrence of paris to almost zero, thereby improving production efficiency.
第１図は本発明によるトリマ刃欠は検出装置の一実施例
を示すブロック図、第２図は第１図のトリマ検出装置に
よる検出結果の一例を示すグラフ図、第３図は渦流式距
離計の配設状況を示す説明図、第４図は信号処理回路を
備えた本発明の一実施例を示すブロック図、第５図はト
リマ装置の説明図である。
１・・・渦流式距離計、２・・微分回路、３・・・判定
回路、４・・・アラーム、１０・・・アンプ、１３・・
・回転計、１４・・・バイパスフィルター１５・・・半
波整流回路、１６・・・包絡線処理回路、１７・・半波
整流回路、１８・・・包絡線処理回路、１９・・・時定
数調整回路、２０・・・差し引き回路、２１・・・比較
アンプ、２２・・・増幅器、２３・・・パルス成形回路
、２４・・・演算器、２５・・・警報機、２６・・・記
録計。Fig. 1 is a block diagram showing an embodiment of the trimmer blade chipping detection device according to the present invention, Fig. 2 is a graph showing an example of detection results by the trimmer detection device of Fig. 1, and Fig. 3 is a eddy current distance detection device. FIG. 4 is a block diagram showing an embodiment of the present invention including a signal processing circuit, and FIG. 5 is an explanatory diagram of a trimmer device. 1... Eddy current distance meter, 2... Differential circuit, 3... Judgment circuit, 4... Alarm, 10... Amplifier, 13...
- Tachometer, 14... Bypass filter 15... Half wave rectifier circuit, 16... Envelope processing circuit, 17... Half wave rectifier circuit, 18... Envelope processing circuit, 19... Hours Constant adjustment circuit, 20... Subtraction circuit, 21... Comparison amplifier, 22... Amplifier, 23... Pulse shaping circuit, 24... Arithmetic unit, 25... Alarm, 26... Recorder.
Claims (4)
、該渦流式距離計から入力される凹凸信号の変化分を検
出する装置と、該検出された変化分と予め設定された凹
凸の変化分の閾値とを比較し、該検出値が閾値を超えた
とき刃欠け信号を出力する装置とを有することを特徴と
する円形刃物の刃欠予知装置。(1) An eddy current distance meter that detects the unevenness of the cutting edge of a circular knife, a device that detects a change in the unevenness signal input from the eddy current distance meter, and a device that detects the detected change and the preset unevenness. What is claimed is: 1. A device for predicting a chipped edge of a circular cutter, comprising: a device that compares a change in the detected value with a threshold value and outputs a chipped chip signal when the detected value exceeds the threshold value.
、渦流式距離計から入力される凹凸信号中の該円形刃物
の刃欠信号と焼き付き信号を弁別する回路を備えた円形
刃物の刃欠予知装置。(2) The blade chipping prediction device for a circular blade according to claim 1, wherein the blade of the circular blade is provided with a circuit that discriminates between a chipping signal and a burn-in signal of the circular blade in the unevenness signal inputted from the eddy current distance meter. Absence prediction device.
数回連続して一致したときのみ真の刃欠けと判断する回
路を備えた請求項１又は２に記載の円形刃物の刃欠予知
装置。(3) The blade chipping prediction for a circular cutter according to claim 1 or 2, further comprising a circuit that determines that the blade is truly chipped only when the period of the detected blade chipping signal coincides with the rotation period of the cutter a plurality of times in succession. Device.
転軸に対してほぼ４５度の方向に、３〜５ｍｍの間隔を
もつて位置せしめた請求項１ないし請求項３の何れか１
項に記載の円形刃物の刃欠予知装置。(4) Any one of claims 1 to 3, wherein the eddy current distance meter is positioned in a direction approximately 45 degrees from the cutting edge of the circular blade to the rotational axis of the circular blade, with an interval of 3 to 5 mm.
A blade chipping prediction device for a circular cutter as described in 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1059655A JP2502736B2 (en) | 1988-09-13 | 1989-03-14 | Device for predicting the lack of a circular tool |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63-229520 | 1988-09-13 | ||
| JP22952088 | 1988-09-13 | ||
| JP1059655A JP2502736B2 (en) | 1988-09-13 | 1989-03-14 | Device for predicting the lack of a circular tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02180520A true JPH02180520A (en) | 1990-07-13 |
| JP2502736B2 JP2502736B2 (en) | 1996-05-29 |
Family
ID=26400713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1059655A Expired - Fee Related JP2502736B2 (en) | 1988-09-13 | 1989-03-14 | Device for predicting the lack of a circular tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2502736B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003004708A (en) * | 2001-06-25 | 2003-01-08 | Kawasaki Steel Corp | Self-comparing type eddy current flaw detector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5914445A (en) * | 1982-06-18 | 1984-01-25 | Mitsubishi Electric Corp | Detector for abnormality of tool |
| JPS6381204A (en) * | 1986-09-25 | 1988-04-12 | Nkk Corp | Diagnostic device for trimmer shearing state |
-
1989
- 1989-03-14 JP JP1059655A patent/JP2502736B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5914445A (en) * | 1982-06-18 | 1984-01-25 | Mitsubishi Electric Corp | Detector for abnormality of tool |
| JPS6381204A (en) * | 1986-09-25 | 1988-04-12 | Nkk Corp | Diagnostic device for trimmer shearing state |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003004708A (en) * | 2001-06-25 | 2003-01-08 | Kawasaki Steel Corp | Self-comparing type eddy current flaw detector |
| JP4674416B2 (en) * | 2001-06-25 | 2011-04-20 | Ｊｆｅスチール株式会社 | Self-comparing eddy current flaw detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2502736B2 (en) | 1996-05-29 |
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| LAPS | Cancellation because of no payment of annual fees |