JP3518345B2 - Life judgment method of transfer roll in furnace - Google Patents
Life judgment method of transfer roll in furnaceInfo
- Publication number
- JP3518345B2 JP3518345B2 JP18319298A JP18319298A JP3518345B2 JP 3518345 B2 JP3518345 B2 JP 3518345B2 JP 18319298 A JP18319298 A JP 18319298A JP 18319298 A JP18319298 A JP 18319298A JP 3518345 B2 JP3518345 B2 JP 3518345B2
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- Japan
- Prior art keywords
- roll
- furnace
- life
- vibration
- frequency response
- Prior art date
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、製鉄業等で鋼板
等を炉内で搬送する際に用いられる炉内搬送ロールを、
非破壊的に調査して寿命を判定する炉内搬送ロールの寿
命判定方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-furnace transfer roll used for transferring a steel plate or the like in a furnace in the iron-making industry.
The present invention relates to a method for determining the life of an in-furnace conveyor roll by nondestructively investigating and determining the life.
【０００２】[0002]
【従来の技術】鋼板の製造においては、鋼板を炉内で連
続的に搬送しながら、熱処理等の処理を行うことがあ
る。その場合、図３に示すように加熱炉１等の炉内には
鋼板２の搬送のために、炉内搬送ロール３が設けられて
いる。炉内搬送ロールは、図４に示すような形状をして
おり、円筒状で中空の胴部３１と、両端の軸受部３２か
らなる。2. Description of the Related Art In the production of a steel sheet, a heat treatment or the like may be performed while the steel sheet is continuously conveyed in a furnace. In that case, as shown in FIG. 3, an in-furnace transfer roll 3 is provided in the furnace such as the heating furnace 1 for transferring the steel sheet 2. The in-furnace transport roll has a shape as shown in FIG. 4, and includes a hollow cylindrical body portion 31 and bearing portions 32 at both ends.
【０００３】炉内搬送ロールは、一般に高温の状態で使
用されるため、変形を生じあるいは疲労し劣化する。こ
のような劣化が進行すると、炉内搬送ロールは使用不能
となるので、その使用可能な期限、即ち寿命を予測する
必要がある。炉内搬送ロールの寿命を予測する方法（寿
命判定方法）としては、ロール径を測定する方法があ
る。この方法は、炉内搬送ロールの表面において、特に
疲労、劣化の激しい部分では大きな肉厚の変化を生じる
ことから、ロール径の変化を測定するにより、寿命判定
するものである。Since the in-furnace conveying roll is generally used in a high temperature state, it is deformed or fatigued and deteriorated. When such deterioration progresses, the in-furnace carrier roll becomes unusable, and therefore, it is necessary to predict the usable deadline, that is, the life. As a method of predicting the life of the in-furnace transport roll (life determining method), there is a method of measuring the roll diameter. In this method, a large change in wall thickness occurs on the surface of the in-furnace transport roll, particularly in a portion where fatigue and deterioration are severe. Therefore, the life is determined by measuring the change in roll diameter.
【０００４】また、特開平８−１６６３３２号公報に、
硬度測定による寿命判定方法が提案されている。この技
術は、超音波硬度計を用いてロール表面の硬度を測定
し、初期の硬度に対して１／２以下となった場合、その
ロールが寿命であると判定する方法である。Further, in Japanese Patent Laid-Open No. 8-166332,
A method of determining life by measuring hardness has been proposed. This technique is a method in which the hardness of the roll surface is measured using an ultrasonic hardness meter, and when the hardness becomes 1/2 or less of the initial hardness, it is determined that the roll has reached the end of its life.
【０００５】その他、透磁率測定により、疲労、材質の
劣化の程度を評価し、ロールの寿命を判定する方法もあ
る。これは、材質面の変化が透磁率の変化として現れる
ことを利用したものである。In addition, there is also a method of evaluating the degree of fatigue and deterioration of the material by measuring the magnetic permeability to determine the life of the roll. This utilizes the fact that the change of the material surface appears as the change of magnetic permeability.
【０００６】[0006]
【発明が解決しようとする課題】しかし、これらの従来
技術には以下の問題点がある。However, these conventional techniques have the following problems.
【０００７】まず、ロール径測定による寿命判定方法
は、ロールの疲労、劣化が必ずしもロール径の変化に対
応しておらず、寿命判定の精度が低い。また、ロール径
の変化が他より小さかった部分から、ロールの折損が起
こることもあり、この方法は信頼性が高いとは言えな
い。一般に、ロール径の変化がそれほど顕著でないロー
ルでも折損する場合が多い。First, in the method of determining the life by measuring the roll diameter, roll fatigue and deterioration do not necessarily correspond to changes in the roll diameter, and the accuracy of the life determination is low. In addition, breakage of the roll may occur from a portion where the change in roll diameter is smaller than the others, so this method cannot be said to be highly reliable. In general, even a roll in which the change in roll diameter is not so remarkable often breaks.
【０００８】硬度測定による寿命判定方法は、ロール表
面を全面にわたって計測する必要があり、計測に時間が
かかる。また、特開平８−１６６３３２号公報記載の技
術のように、超音波硬度計を用いて計測を効率化して
も、ロール表面の全面を走査するためには、センサの走
査装置等、設備面でのコストがかかる。さらにはその自
動化にも、コストを必要とする。In the method of determining the life by measuring hardness, it is necessary to measure the entire surface of the roll, and it takes time to measure. Further, as in the technique described in Japanese Patent Application Laid-Open No. 8-166332, even if the measurement is made efficient by using an ultrasonic hardness meter, in order to scan the entire surface of the roll, in terms of equipment such as a scanning device of a sensor. Costs. Furthermore, the automation also requires a cost.
【０００９】透磁率測定による寿命判定方法は、やは
り、ロール表面を全面にわたって計測する必要があり、
計測に時間がかかる。また、このような材質面での変化
を検出する目的で使用する透磁率のセンサは、耐熱温度
が４０℃と低いため、炉内で計測するためには、炉内温
度が高いと使用できない。炉温を４０℃以下となるよう
低下させるには、長時間のライン停止が必要であり炉の
生産効率が低下する。In the life judging method by measuring the magnetic permeability, it is necessary to measure the entire surface of the roll.
It takes time to measure. Further, since the magnetic permeability sensor used for the purpose of detecting such a change in the material surface has a low heat resistance temperature of 40 ° C., it cannot be used at a high furnace temperature for measurement in the furnace. In order to lower the furnace temperature to 40 ° C. or lower, it is necessary to stop the line for a long time, which lowers the furnace production efficiency.
【００１０】この発明は、上記のような従来の寿命判定
方法における問題点を解決し、ロール表面の全面につい
て計測する必要がなく、簡便な設備でラインを停止が短
時間で済む炉内搬送ロールの寿命判定方法を提供するこ
とを目的とする。The present invention solves the problems in the conventional life determining method as described above, does not need to measure the entire surface of the roll, and the line can be stopped in a furnace with simple equipment in a short time. It is an object of the present invention to provide a method for determining the life of the.
【００１１】[0011]
【課題を解決するための手段】第１の発明は、円筒状で
中空の胴部と両端の軸受部からなる炉内搬送ロールを非
破壊的に調査して寿命を判定する炉内搬送ロールの寿命
判定方法において、炉内搬送ロールに所定の加振力を加
え、この炉内搬送ロールの振動をロール胴部に取り付け
た振動センサで計測し、計測された振動から周波数応答
関数を測定し、この周波数応答関数を基準となる周波数
応答関数と比較し、ロールの肉厚あるいは材質の変化に
伴う固有振動の変化を、 6 次以上の特定の１つの固有振
動についてその振動数の基準値との差に基づき検出し
て、炉内搬送ロールの寿命を判定することを特徴とする
炉内搬送ロールの寿命判定方法である。The first invention is a cylindrical shape.
In the life determination method of the in-furnace transport rolls to determine the life by non-destructively inspecting the in-furnace transport rolls consisting of a hollow body portion and bearing portions at both ends , a predetermined vibration force is applied to the in-furnace transport rolls, Attach the vibration of this in-furnace transfer roll to the roll body
Measured with a vibration sensor, measure the frequency response function from the measured vibration, and compare this frequency response function with the reference frequency response function to detect changes in the roll thickness or material.
Change the accompanying natural vibration to one specific natural vibration of 6th order or higher.
Motion based on the difference between the vibration frequency and the reference value
Then, the life of the in-furnace transport roll is determined.
【００１２】この発明は、炉内搬送ロールの寿命判定方
法について、種々の方法を検討する中でなされた。その
中で、炉内搬送ロールの劣化に伴い、その周波数応答関
数が変化することを見出した。この発明は、炉内搬送ロ
ールの寿命を判定するために、この周波数応答関数が変
化する現象を用いている。ここで、周波数応答関数は、
加振力と振動から得られる伝達関数を、振動数（周波
数、角振動数）の関数として表現したものである。The present invention was made while examining various methods for determining the life of the in-furnace carrier roll. Among them, it was found that the frequency response function changed with the deterioration of the in-furnace transport roll. The present invention uses the phenomenon that the frequency response function changes in order to determine the life of the in-furnace carrier roll. Where the frequency response function is
The transfer function obtained from the exciting force and the vibration is expressed as a function of the frequency (frequency, angular frequency).
【００１３】加振力としては、一般の加振実験に用いら
れるインパルス、スイープサイン、バーストチャープ、
ランダム等、種々の形態を用いることができる。加振力
を加える箇所は最低１箇所、振動を検出する箇所も最低
１箇所でよい。従って、従来技術のようにロールの全面
について計測する必要はなく、計測時間を大幅に削減で
きる。As the exciting force, impulse, sweep sine, burst chirp, which are used in general exciting experiments,
Various forms such as random can be used. It is sufficient that at least one place applies an exciting force and at least one place detects vibration. Therefore, it is not necessary to measure the entire surface of the roll as in the prior art, and the measuring time can be greatly reduced.
【００１４】基準となる周波数応答関数としては、搬送
ロールの使用前に予め測定しておいたもの、あるいは同
一仕様の新品ロールについて測定したものを用いること
ができる。また、比較の際は、測定値と基準値につい
て、固有振動数の大きさあるいは周波数等、何らかの特
性値についてそれらの差を求めると比較しやすい。As the reference frequency response function, one measured in advance before using the carrier roll or one measured for a new roll having the same specifications can be used. Further, at the time of comparison, it is easy to compare the measured value and the reference value with respect to some characteristic value such as the magnitude or frequency of the natural frequency.
【００１５】この発明による寿命判定の精度について
は、後述のように、従来の透磁率計による判定方法と同
等の寿命判定精度が得られ、少なくともロール径測定に
よる判定より信頼がおける。また、この発明で用いる振
動センサの耐熱温度は、透磁率センサの耐熱温度（４０
℃）に比べ、はるかに高温となっている。従って、計測
の際に炉温をあまり下げる必要がなく、炉温低下による
稼働率の低下を防止できる。Regarding the accuracy of the life judgment according to the present invention, as will be described later, the life judgment accuracy equivalent to that of the judgment method by the conventional magnetic permeability meter can be obtained, and it is at least more reliable than the judgment by the roll diameter measurement. The heat resistance temperature of the vibration sensor used in the present invention is the heat resistance temperature of the magnetic permeability sensor (40
℃) is much higher temperature. Therefore, it is not necessary to reduce the furnace temperature so much at the time of measurement, and it is possible to prevent the operating rate from decreasing due to the decrease in the furnace temperature.
【００１６】第２の発明は、加振力を打撃加振法により
加えることを特徴とする第１の発明の炉内搬送ロールの
寿命判定方法である。A second aspect of the present invention is the method for determining the life of the in-furnace carrier roll according to the first aspect of the present invention, in which a vibrating force is applied by an impact vibrating method.
【００１７】この発明では、加振力として試験対象に打
撃を加える打撃加振法により、インパルス応答を測定す
る。打撃法では、加振力をハンマ等で加えればよいの
で、特別な加振装置を必要とせず、搬送ロールには振動
センサのみ取付ければよい。従って、振動の計測が簡便
となり、特に搬送ロールを炉内に設置したままでも、容
易に周波数応答関数を測定することができる。In the present invention, the impulse response is measured by the impact vibration method in which the test object is impacted as the excitation force. In the striking method, since a vibration force may be applied with a hammer or the like, a special vibration device is not required and only the vibration sensor may be attached to the transport roll. Therefore, the vibration can be easily measured, and the frequency response function can be easily measured even when the carrier roll is still installed in the furnace.
【００１８】これらの発明は、周波数応答関数の比較の
際、6 次以上の特定の１つの固有振動についてその振動
数の基準値との差に基づき炉内搬送ロールの寿命を判定
することを特徴としている。 These inventions are characterized in that, when comparing frequency response functions, the life of the in-furnace carrier rolls is determined based on the difference between the specific natural frequency of 6th order or higher and the reference value of its frequency. I am trying .
【００１９】これらの発明では、特定の固有振動とし
て、使用前後の変化が大きく現れる次数の固有振動を、
別途調査して見つけておく。ここで、適切な固有振動
は、ロールの寸法形状や材質により異なると考えられ
る。後述のように、ごく一般的な炉内搬送ロールについ
ては、この方法が有効であることがわかる。周波数応答
関数は、周波数の低い領域ではほとんど変化がなく、周
波数が高くなると特に 6 次以上の固有振動で変化が顕著
となる。その中で、最も感度の良い特定の固有振動に対
応するピークの位置のシフトを、本発明では用いる。 In these inventions, as the specific natural vibration, the natural vibration of the order in which the change before and after use greatly appears,
Separately research and find. Here, it is considered that the proper natural vibration differs depending on the size and shape of the roll and the material. As will be described later, it is found that this method is effective for a very general in-furnace conveyor roll. Frequency response
The function shows almost no change in the low frequency region and
When the wave number becomes high , the change is remarkable especially with the natural vibration of 6th order or higher
Becomes Among them, the most sensitive specific natural vibration
A shift in the position of the corresponding peak is used in the present invention.
【００２０】[0020]
【発明の実施の形態】図１は、本発明による寿命判定方
法の一例を示す概略図である。ここでは、炉内搬送ロー
ル３を取り出して、両端（軸受部）３２をブロック４で
支持して試験を行った。試験はまず、ロール中央部（胴
部）３１を半径方向に加振器（ハンマ）６で加振し、そ
の直近に取付けた振動センサ５（加速度型ピックアップ
センサ）により振動を計測する。この計測された振動波
形を用いて、周波数応答関数を測定する。1 is a schematic diagram showing an example of a life determining method according to the present invention. Here, the in-furnace transport roll 3 was taken out, and both ends (bearing portions) 32 were supported by the blocks 4 to perform a test. In the test, first, the central part (body) 31 of the roll is vibrated in the radial direction by a vibration exciter (hammer) 6, and the vibration is measured by a vibration sensor 5 (acceleration type pickup sensor) mounted in the vicinity thereof. A frequency response function is measured using this measured vibration waveform.
【００２１】この方法により、炉の定期点検の際、炉内
搬送ロールの中で使用期間が寿命に近づいているロール
を、炉外に取り出して測定を行った。比較方法として、
ロール径測定および透磁率測定による寿命判定も行っ
た。また、判定基準となるロールとして、同じ種類で新
品のロールについても、これらの方法で測定を行った。According to this method, at the time of periodic inspection of the furnace, the roll of which the service life was close to the end of life was taken out of the furnace and measured. As a comparison method,
The life was also determined by measuring the roll diameter and the magnetic permeability. Further, as a roll serving as a criterion, a new roll of the same type was also measured by these methods.
【００２２】図２に、周波数応答関数の一例を示す。図
中、実線は試験ロール、破線は同じ材質・寸法の新品の
ロールを示す。周波数応答関数は、周波数の低い領域で
は値が小さくまた、試験ロールと新品ロールの差もほと
んどない。周波数が高くなると、周波数応答関数は値が
大きくなるとともに、新旧２本のロールの差が顕著とな
り、ピークの位置がシフトしていることがわかる。FIG. 2 shows an example of the frequency response function. In the figure, the solid line shows the test roll, and the broken line shows the new roll of the same material and dimensions. The value of the frequency response function is small in the low frequency region, and there is almost no difference between the test roll and the new roll. It can be seen that as the frequency becomes higher, the value of the frequency response function becomes larger, and the difference between the two rolls, new and old, becomes remarkable, and the peak position shifts.
【００２３】周波数応答関数は、この図の場合は特に８
００Ｈｚ前後のピーク（６次固有振動に対応）で、新旧
ロールによるピークの周波数の差が大きく（５０Ｈｚ以
上）なっている。その他、周波数応答関数の特徴を表す
パラメータについて調査し、最も感度の良いパラメータ
を選ぶと、６次固有振動に対応するピークの位置のシフ
トが最適であった。The frequency response function is especially 8 in this case.
At the peak around 00 Hz (corresponding to the 6th natural vibration), the difference in peak frequency between the old and new rolls is large (50 Hz or more). In addition, when the parameter showing the characteristic of the frequency response function was investigated and the most sensitive parameter was selected, the shift of the position of the peak corresponding to the sixth order natural vibration was optimum.
【００２４】そこで、６次固有振動のピークシフトを測
定してまとめると、表１のようになる。この表で、ロー
ルＮｏ．１，２，５は、透磁率測定による判定で正常、
ロールＮｏ．３，４は同様に危険（寿命に到達）と認め
られたロールである。ピークシフトの大きさは、前者で
は２５〜３７Ｈｚ、後者では６５〜７９Ｈｚであった。
これよりこのロールについては、ピークシフトが５０Ｈ
ｚで寿命に到達と判定すればよいことがわかる。Therefore, the peak shift of the sixth natural vibration is measured and summarized as shown in Table 1. In this table, roll No. Nos. 1, 2, and 5 are normal as determined by magnetic permeability measurement,
Roll No. Similarly, rolls 3 and 4 are recognized as dangerous (the life is reached). The magnitude of the peak shift was 25 to 37 Hz for the former and 65 to 79 Hz for the latter.
From this, the peak shift of this roll is 50H.
It can be seen that it is sufficient to determine that the life is reached with z.
【００２５】また、ロールＮｏ．３については、ロール
径測定による判定では正常となっているが、透磁率測定
および本発明による判定では危険となっている。過去の
実績からは、ロール径測定による判定より、透磁率測定
の方が信頼のおける方法である。従って、この発明の方
法は透磁率測定と同等の精度で、炉内搬送ロールの寿命
判定が可能であることがわかる。Further, the roll No. No. 3 is normal in the determination by the roll diameter measurement, but is dangerous in the magnetic permeability measurement and the determination according to the present invention. From the past results, magnetic permeability measurement is a more reliable method than roll diameter measurement. Therefore, it is understood that the method of the present invention can determine the life of the in-furnace carrier roll with the same accuracy as the magnetic permeability measurement.
【００２６】[0026]
【表１】 [Table 1]
【００２７】この例では、周波数応答関数のパラメータ
として、６次固有振動のピークシフトを用いたが、他の
次数の固有振動のピークシフトを用いてもよい。また、
寿命判定用のパラメータとしては、ピークシフトのみに
限定されるものではなく、周波数応答関数により求まる
すべてのパラメータを使用することができる。In this example, the peak shift of the natural vibration of the sixth order is used as the parameter of the frequency response function, but the peak shift of the natural vibration of other orders may be used. Also,
The parameters for life determination are not limited to the peak shift, and all parameters obtained by the frequency response function can be used.
【００２８】加振点あるいは応答点についても、ロール
の中央部のみに限定されるものではなく、例えば、加振
点を中央部、応答点をロール端部とする中央部加振−端
部応答の周波数応答関数を用いることも可能である。さ
らに、周波数応答関数は１種類に限定されるものではな
く、例えば、１点加振−多点応答、多点加振−１点応
答、あるいは多点加振−多点応答により得られた複数の
周波数応答関数から、寿命判定用のパラメータを求める
ことも可能である。The excitation point or response point is not limited to the central portion of the roll, and for example, the central portion excitation-end response in which the excitation point is the central portion and the response point is the roll end portion. It is also possible to use the frequency response function of Furthermore, the frequency response function is not limited to one type, and for example, a plurality of points obtained by one-point excitation-multipoint response, multipoint excitation-one-point response, or multipoint excitation-multipoint response. It is also possible to determine the life determination parameter from the frequency response function of.
【００２９】このように、発明の方法によると、従来の
ロール径測定による判定方法に比べ、寿命判定の精度が
高い。従来の超音波硬度計および透磁率計による判定方
法に比べ、計測点が少なく最低１点でよいため計測時間
が短くなる。従って、自動化が容易となり、低コスト化
が図れるとともに、従来の透磁率計による判定方法と同
等の寿命判定精度が得られる。As described above, according to the method of the present invention, the accuracy of life judgment is higher than that of the conventional judgment method by measuring the roll diameter. Compared with the conventional determination method using an ultrasonic hardness meter and a permeability meter, the number of measurement points is small and at least one is sufficient, so the measurement time is shortened. Therefore, automation can be facilitated, cost can be reduced, and life determination accuracy equivalent to that of a conventional determination method using a permeability meter can be obtained.
【００３０】また、この発明で用いる振動センサの耐熱
温度は３００℃以上であり、透磁率センサの耐熱温度４
０℃に比べはるかに高温となっている。従って、計測の
際に炉温をあまり下げる必要がなく、炉温低下による稼
働率の低下を防止できる。The heat resistance temperature of the vibration sensor used in the present invention is 300 ° C. or higher, and the heat resistance temperature of the magnetic permeability sensor is 4
It is much hotter than 0 ° C. Therefore, it is not necessary to reduce the furnace temperature so much at the time of measurement, and it is possible to prevent the operating rate from decreasing due to the decrease in the furnace temperature.
【００３１】[0031]
【発明の効果】この発明によれば、炉内搬送ロールの周
波数応答関数を測定して基準となる周波数応答関数と比
較することにより寿命を判定するので、ロール表面の全
面について計測する必要がなく、最低１箇所で振動を計
測すればよい。また、計測装置は、ハンマ等の加振器と
通常の振動検出器でよく、簡便な設備で炉内搬送ロール
の寿命の判定が可能となり、また、比較的高温でも測定
可能なので、ライン停止が短時間で済むという効果があ
る。According to the present invention, since the life is judged by measuring the frequency response function of the in-furnace carrier roll and comparing it with the reference frequency response function, it is not necessary to measure the entire roll surface. It suffices to measure vibration at at least one place. In addition, the measuring device may be a shaker such as a hammer and a normal vibration detector, and it is possible to determine the life of the in-furnace transfer rolls with simple equipment, and since it is possible to measure even at relatively high temperatures, line stop is possible. The effect is that it can be completed in a short time.
【図１】発明の寿命判定方法の一例を示す概略図であ
る。FIG. 1 is a schematic view showing an example of a life determining method of the invention.
【図２】周波数応答関数の一例を示す図である。FIG. 2 is a diagram showing an example of a frequency response function.
【図３】加熱炉の概略図である。 （ａ）長手方向断面図 （ｂ）幅方向断面図FIG. 3 is a schematic view of a heating furnace. (A) Longitudinal sectional view (b) Width sectional view
【図４】炉内搬送ロールの斜視図である。FIG. 4 is a perspective view of an in-furnace transport roll.
１ 加熱炉 ２ 鋼板 ３ 炉内搬送ロール ３１ 胴部 ３２ 軸受部 ４ ブロック ５ 振動センサ ６ 加振器（ハンマ） 1 heating furnace 2 steel plate 3 In-furnace transport roll 31 torso 32 Bearing 4 blocks 5 Vibration sensor 6 shaker (hammer)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平川 猛 東京都千代田区丸の内一丁目１番２号 日本鋼管株式会社内 (56)参考文献 特開 平４−2943（ＪＰ，Ａ) 特開 平６−300667（ＪＰ，Ａ) 特開 平３−54435（ＪＰ，Ａ) 特開 平８−304236（ＪＰ，Ａ) 特開 平10−38748（ＪＰ，Ａ) 特開 平７−110289（ＪＰ，Ａ) 特開 昭63−98526（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01M 7/02 G01M 13/00 G01N 29/12 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Hirakawa 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Inside Nippon Kokan Co., Ltd. (56) Reference JP-A-4-2943 (JP, A) JP-A-6 -300667 (JP, A) JP-A-3-54435 (JP, A) JP-A-8-304236 (JP, A) JP-A-10-38748 (JP, A) JP-A-7-110289 (JP, A) ) JP-A-63-98526 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) G01M 7/02 G01M 13/00 G01N 29/12
Claims (2)
なる炉内搬送ロールを非破壊的に調査して寿命を判定す
る炉内搬送ロールの寿命判定方法において、炉内搬送ロ
ールに所定の加振力を加え、この炉内搬送ロールの振動
をロール胴部に取り付けた振動センサで計測し、計測さ
れた振動から周波数応答関数を測定し、この周波数応答
関数を基準となる周波数応答関数と比較し、ロールの肉
厚あるいは材質の変化に伴う固有振動の変化を、 6 次以
上の特定の１つの固有振動についてその振動数の基準値
との差に基づき検出して、炉内搬送ロールの寿命を判定
することを特徴とする炉内搬送ロールの寿命判定方法。1. A cylindrical hollow body and bearings at both ends
In the method for determining the life of the in-furnace transport rolls, the vibration of the in-furnace transport rolls is applied to the roll cylinder by the non-destructive inspection of the in-furnace transport rolls to determine the life. measured by the vibration sensor attached to part, to measure the frequency response function from the measured vibration, compared to the frequency response function as a reference this frequency response function, roll meat
The change in the natural frequency due to a change in the thickness or material, 6 Tsugi以
Reference value of the frequency for one specific natural vibration above
The method for determining the life of the in-furnace transport rolls is characterized by detecting the life of the in-furnace transport rolls.
特徴とする請求項１記載の炉内搬送ロールの寿命判定方
法。2. The life determining method of the in-furnace carrier roll according to claim 1, wherein the vibrating force is applied by an impact vibrating method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18319298A JP3518345B2 (en) | 1998-06-30 | 1998-06-30 | Life judgment method of transfer roll in furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18319298A JP3518345B2 (en) | 1998-06-30 | 1998-06-30 | Life judgment method of transfer roll in furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000019054A JP2000019054A (en) | 2000-01-21 |
| JP3518345B2 true JP3518345B2 (en) | 2004-04-12 |
Family
ID=16131394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18319298A Expired - Fee Related JP3518345B2 (en) | 1998-06-30 | 1998-06-30 | Life judgment method of transfer roll in furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3518345B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100889290B1 (en) * | 2002-08-30 | 2009-03-17 | 재단법인 포항산업과학연구원 | A Method for Calculating the Roll Life in a Continuous Casting |
| JP4759235B2 (en) * | 2004-07-23 | 2011-08-31 | 日本ポリプロ株式会社 | Polypropylene-based laminated film |
| CN101793227B (en) | 2008-12-12 | 2013-11-06 | 维斯塔斯风力***有限公司 | A method for controlling the operation of a wind turbine and a wind turbine |
| JP6371409B2 (en) * | 2014-12-10 | 2018-08-15 | 原子燃料工業株式会社 | Method for evaluating the condition of members |
| CN117029473B (en) * | 2023-09-27 | 2024-03-29 | 佛山市景鑫达陶瓷机械有限公司 | Roller kiln broken rod alarm method and system based on visual anti-shake judgment |
-
1998
- 1998-06-30 JP JP18319298A patent/JP3518345B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000019054A (en) | 2000-01-21 |
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