JP4178825B2 - Method for detecting rolling anomalies in multi-high mills - Google Patents
Method for detecting rolling anomalies in multi-high mills Download PDFInfo
- Publication number
- JP4178825B2 JP4178825B2 JP2002105179A JP2002105179A JP4178825B2 JP 4178825 B2 JP4178825 B2 JP 4178825B2 JP 2002105179 A JP2002105179 A JP 2002105179A JP 2002105179 A JP2002105179 A JP 2002105179A JP 4178825 B2 JP4178825 B2 JP 4178825B2
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- load current
- current value
- stand
- abnormality
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Metal Rolling (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、多段圧延機における圧延異常を検出する方法に係り、特に継目無管製造ラインのマンドレルミル、サイザー、レデューサー等の多段圧延機に好適な圧延異常検出方法に関するものである。
【０００２】
【従来の技術】
多段圧延機では、１スタンドのうちの１本のロールで異常が発生しても、同じスタンドのその他のロール及び前記異常が発生したスタンドの前後のスタンドに異常がなければ圧延を行なえるため、圧延材が途中で止まることはない。従って、例えば下工程の表面検査に流れるまで圧延を継続する場合があり、品質不適合材が大幅に発生してしまう。
【０００３】
このような品質不適合材の発生を防止するために、例えば特開平８−３０００２１号には、ストレッチレデューサへの素管の管端の噛み込み、尻抜けのタイミングを検出する方法が開示されている。また、実開平３−９２０３号には、マンドレルミルの圧延状態の良否を検出する装置が開示されている。また、特開平７−１９４１８６号には、モータとその駆動対象の異常を圧延負荷電流値（以下、単に「負荷電流値」という。）により検出する装置が開示されている。
【０００４】
【発明が解決しようとする課題】
しかしながら、特開平８−３０００２１号で開示された検出方法は、ストレッチレデューサ各スタンドの駆動軸における捩りトルクを検出して、その周波数成分のパワースペクトルレベルに基づいて噛み込み、尻抜けと認識するものであるが、多段圧延機による圧延時には、１スタンドのうちの１本のロールが割損した時でも圧延できるため、前記捩りトルクを検出してもその閾値でロール割損を判断することはできない。
【０００５】
また、実開平３−９２０３号で開示された検出装置は、予め定められた結果と現在圧延中の結果を比較することで圧延状態の良否を判断するので、１本についての圧延状態の良否を判断することはできるものの、現在圧延中の前後の材料を比較するものではないので、ロールの割損を検出することはできない。
【０００６】
また、特開平７−１９４１８６号で開示された検出装置は、駆動条件が同一である２つ以上のモータを対象として、そのモータ間での負荷電流値差により異常を検出するものであるため、例えばストレッチレデューサのように各スタンドが一つのモータで駆動され、夫々のスタンド間でモータの駆動条件が異なる場合には、モータの負荷電流値差で異常を検出することができない。更に、このような多段圧延機では、上流或いは下流からの張力バランスによりそのモータの負荷電流値が変動するため、圧延異常を検出することが困難になる。
【０００７】
本発明は、上記した従来の問題点に鑑みてなされたものであり、多段圧延機における圧延異常を、圧延中に瞬時に検出することができる多段圧延機の圧延異常検出方法を提供することを目的としている。
【０００８】
【課題を解決するための手段】
上記した目的を達成するために、本発明に係る多段圧延機の圧延異常検出方法は、多段圧延機の各スタンドにおける負荷電流値を検出し、この検出した負荷電流値の変化により、圧延異常か否かを判断する多段圧延機の圧延異常検出方法において、圧延負荷電流値の変化による圧延異常か否かの判断を、例えば多段圧延機の各スタンドにおいて圧延１回毎に圧延負荷電流値を検出し、各スタンド毎に、現在圧延中の材料の圧延負荷電流値と前回の圧延負荷電流値を比較し、両者の差が予め設定した閾値を越えて変化したか否かにより行なうこととしている。
【０００９】
そして、このようにすることで、肉厚計や外径計等の計測機器では検出できない品質上の問題が発生する圧延異常を、圧延中に瞬時に検出することができるようになる。
【００１０】
【発明の実施の形態】
大量に発生する品質不適合材には、圧延機出側に設けられた計測機器（肉厚計、外径計等）によって検出が可能な寸法上の問題を有するものと、計測機器での検出が可能でないロール筋のような品質上の問題を有するものがあるが、ロール割損の場合は前記ロール筋のような計測機器では検出できない品質上の問題が発生するので、その検出は圧延中に行なわざるを得ない。
【００１１】
本発明者が種々調査した結果、圧延異常時には、例えば圧延異常スタンドとその前後のスタンドでの負荷電流値が正常時に比べて変化するといった、負荷電流値に変化が生じることを知見した。
【００１２】
例えば圧延異常のうち、ロール割損については、１スタンドのロールのうち１本が割損することを想定しているが、この際、割損したスタンドではロール１本分圧延が行なわれないので、負荷電流値が低下することになる。反対に１つ後段のスタンドでは割損したスタンドでの負荷が軽減された分、負荷電流値は上昇することになる等である。
【００１３】
本発明に係る多段圧延機の圧延異常検出方法は、かかる知見に基づいてなされたものであり、多段圧延機の各スタンドにおける負荷電流値を検出し、この検出した負荷電流値の変化により、圧延異常か否かを判断するものである。
【００１４】
より具体的には、上記の本発明に係る多段圧延機の圧延異常検出方法における負荷電流値の変化による圧延異常か否かの判断を、(1) 多段圧延機の各スタンドにおいて圧延１回毎に負荷電流値を検出し、各スタンド毎に、現在圧延中の材料の負荷電流値と前回の負荷電流値を比較し、両者の差が予め設定した閾値を越えて変化したか否かにより行なったり、(2) 多段圧延機のあるスタンドでの負荷電流値が正常時の負荷電流値に比べて予め定めた閾値以上減少し、次スタンドでの負荷電流値が正常時の負荷電流値に比べて予め定めた閾値以上増加したか否かにより行なったりするのである。
【００１５】
上記の本発明に係る多段圧延機の圧延異常検出方法によれば、ロール割損に起因する圧延異常のように、肉厚計や外径計等の計測機器では検出できない品質上の問題が発生する特に継目無管の圧延異常を、圧延中に瞬時に検出することができるようになる。
【００１６】
また、上記の本発明に係る多段圧延機の圧延異常検出方法において、圧延異常の検出時、次材以降の抽出を停止してロール交換の指示を出すようにした場合には、品質不適合材の発生を効果的に抑制できるようになる。
【００１７】
上記の本発明に係る多段圧延機の圧延異常検出方法において、圧延異常か否かの判断に使用する負荷電流は、ピーク値を除く平均値を使用する。また、閾値は、外径、肉厚から過去の発生データに基づいて適宜決定した値を使用する。
【００１８】
【実施例】
以下、本発明に係る多段圧延機の圧延異常検出方法の実施例を図１〜図２に基づいて説明する。
図１は請求項１に対応する本発明に係る多段圧延機の圧延異常検出方法のフローチャート、図２は請求項２に対応する本発明に係る多段圧延機の圧延異常検出方法のフローチャートを示す。
【００１９】
本発明に係る多段圧延機の圧延異常検出方法は、例えばストレッチレデューサのような多段圧延機の各スタンドにおける負荷電流値を検出し、この検出した負荷電流値の変化により、圧延異常か否かを判断するものであり、検出する負荷電流値としては、(1) 各スタンド毎の、圧延中の材料の負荷電流値と前回圧延中の負荷電流値を使用したり、(2) あるスタンドと次スタンドにおける圧延中と正常圧延中での負荷電流値を使用したりする。
【００２０】
そして、例えば▲１▼の各スタンド毎の、圧延中の材料の負荷電流値と前回圧延中の負荷電流値を使用する場合には、図１のフロー図に示した順序で負荷電流値を比較し、圧延異常か否かを判断する。
【００２１】
すなわち、先ず、各スタンドにおいて圧延１回毎に圧延中の負荷電流値を検出し、ピーク値を除く平均値を算出する。次に、各スタンド毎に、圧延中の材料の負荷電流値（平均値）と、前回圧延中の負荷電流値（平均値）を比較する。そして、両者の差が、予め外径、肉厚から過去の発生データに基づいて決定した閾値を越えている場合には、圧延不良と判断する一方、両者の差が前記閾値未満の場合には、良好と判断するのである。
【００２２】
また、▲２▼のあるスタンドと次スタンドにおける圧延中と正常圧延中での負荷電流値を使用する場合には、図２のフロー図に示した順序で負荷電流値を比較し、圧延異常すなわちロール異常か否かを判断する。
【００２３】
すなわち、先ず、あるスタンドにおける圧延中の材料の負荷電流値を検出し、ピーク値を除く平均値を算出する。そして、前記負荷電流値（平均値）と正常圧延時における負荷電流値（平均値）を比較し、前記負荷電流値（平均値）の減少量が前記したように予め設定した閾値を越えている場合には、次スタンドにおける圧延中の材料の負荷電流値を検出し、ピーク値を除く平均値を算出する。一方、圧延中の材料の負荷電流値（平均値）の増加量又は減少量が予め設定した前記閾値未満の場合には、良好と判断するのである。
【００２４】
次に、次スタンドにおける圧延中の材料の負荷電流値（平均値）と、正常圧延時における負荷電流値（平均値）を比較し、前記負荷電流値（平均値）の増加量が前記したように予め設定した閾値を越えている場合には、ロール異常と判断する一方、圧延中の材料の負荷電流値（平均値）の増加量又は減少量が予め設定した前記閾値未満の場合には、良好と判断するのである。
【００２６】
なお、上記の本発明に係る多段圧延機の圧延異常検出方法において、圧延異常の検出時、次材以降の抽出を停止してロール交換の指示を出すようにした場合には、品質不適合材の発生を効果的に抑制できるようになる。
【００２７】
次に、本発明に係る多段圧延機の圧延異常検出方法の効果を確認するために行なった実験結果に基づいて説明する。
実験は、材質がＪＩＳ Ｇ ４０５１に規定するＳ２５Ｃの、外径が８２．６ｍｍ、肉厚が２５．４ｍｍの素管を、６スタンドのストレッチレデューサを用いて絞り圧延した際に、図２に示した請求項２に対応する本発明方法を実施することにより行なった。
【００２８】
図３（ａ）は第６スタンドにおける予め検出しておいた正常圧延時の材料の負荷電流値を示した図、図３（ｂ）は第６スタンドにおける現在圧延中の材料の負荷電流値を示した図である。
【００２９】
また、図３（ｃ）は第７スタンドにおける予め検出しておいた正常圧延時の材料の負荷電流値を示した図、図３（ｄ）は第７スタンドにおける現在圧延中の材料の負荷電流値を示した図である。
【００３０】
これら、図３（ａ）と図３（ｂ）に示した第６スタンドにおける負荷電流値のピーク値を除く平均値を比較すると、第６スタンドにおける現在の圧延では、正常圧延時に比べて前記平均値は減少していることが判る。
【００３１】
一方、図３（ｃ）と図３（ｄ）に示した第７スタンドにおける負荷電流値のピーク値を除く平均値を比較すると、第７スタンドにおける現在の圧延では、正常圧延時に比べて前記平均値は増加していることが判る。
【００３２】
そして、本実験では、これら第６スタンドの減少量と第７スタンドの増加量が、共に前記したように予め決定した閾値よりも大きかったので、圧延不良と判断した。
【００３３】
【発明の効果】
以上説明したように、本発明によれば、多段圧延機の圧延異常を、圧延中に早期に発見し、異常圧延の継続を防止して、ロール疵、スリップ等の品質不適合材を減少させることができる。
【図面の簡単な説明】
【図１】 請求項１に対応する本発明に係る多段圧延機の圧延異常検出方法のフローチャートである。
【図２】 請求項２に対応する本発明に係る多段圧延機の圧延異常検出方法のフローチャートである。
【図３】 請求項２に対応する本発明に係る多段圧延機の圧延異常検出方法の実施例図であり、（ａ）（ｂ）は第６スタンドにおける、また、（ｃ）（ｄ）は第７スタンドにおける材料の負荷電流値を示した図で、（ａ）（ｃ）は予め検出しておいた正常圧延時、（ｂ）（ｄ）は現在の圧延時を示した図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for detecting a rolling abnormality in a multi-high rolling mill, and more particularly to a rolling abnormality detecting method suitable for a multi-high rolling mill such as a mandrel mill, a sizer, or a reducer in a seamless pipe production line.
[0002]
[Prior art]
In a multi-high rolling mill, even if an abnormality occurs in one roll of one stand, rolling can be performed if there is no abnormality in the other rolls in the same stand and the stands before and after the abnormality occurred, Rolled material does not stop halfway. Therefore, for example, rolling may be continued until the surface inspection of the lower process flows, and quality-incompatible materials are greatly generated.
[0003]
In order to prevent the occurrence of such a quality nonconforming material, for example, Japanese Patent Laid-Open No. 8-300021 discloses a method for detecting the timing of biting of the pipe end of the raw tube into the stretch reducer and the bottom end. . Japanese Utility Model Laid-Open No. 3-9203 discloses an apparatus for detecting the quality of a mandrel mill in a rolled state. Japanese Patent Application Laid-Open No. 7-194186 discloses a device that detects an abnormality of a motor and its driven object by a rolling load current value (hereinafter simply referred to as “load current value”).
[0004]
[Problems to be solved by the invention]
However, the detection method disclosed in Japanese Patent Application Laid-Open No. 8-300021 detects torsion torque on the drive shaft of each stretch reducer stand, bites it based on the power spectrum level of its frequency component, and recognizes it as a trailing edge. However, at the time of rolling by a multi-high rolling mill, rolling can be performed even when one roll of one stand is broken, so even if the torsion torque is detected, the roll breakage cannot be determined by the threshold value. .
[0005]
In addition, the detection device disclosed in Japanese Utility Model Publication No. 3-9203 judges whether the rolling state is good or not by comparing the predetermined result with the current rolling result. Although it can be judged, it does not compare the material before and after the current rolling, so it is impossible to detect the breakage of the roll.
[0006]
In addition, the detection device disclosed in Japanese Patent Application Laid-Open No. 7-194186 detects an abnormality based on a load current value difference between two or more motors having the same driving condition. For example, when each stand is driven by one motor as in a stretch reducer and the motor driving conditions differ between the stands, it is not possible to detect an abnormality from the difference in motor load current value. Furthermore, in such a multi-high rolling mill, the load current value of the motor varies depending on the tension balance from the upstream or downstream, so that it is difficult to detect a rolling abnormality.
[0007]
The present invention has been made in view of the above-described conventional problems, and provides a rolling abnormality detection method for a multi-high rolling mill capable of instantaneously detecting a rolling abnormality in a multi-high rolling mill during rolling. It is aimed.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the rolling abnormality detection method for a multi-high rolling mill according to the present invention detects a load current value at each stand of the multi-high rolling mill, and determines whether a rolling abnormality is caused by the change in the detected load current value. In the method of detecting abnormalities in rolling of a multi-high rolling mill for determining whether or not there is a rolling abnormality due to a change in rolling load current value, for example, detecting the rolling load current value for each rolling in each stand of the multi-high rolling mill Then, for each stand, the rolling load current value of the material currently being rolled is compared with the previous rolling load current value, and it is determined whether or not the difference between the two has changed beyond a preset threshold value .
[0009]
And by doing in this way, it becomes possible to instantaneously detect a rolling abnormality that causes a quality problem that cannot be detected by a measuring instrument such as a wall thickness gauge or an outer diameter meter during rolling.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
There are dimensional problems that can be detected by measuring instruments (thickness gauges, outer diameter gauges, etc.) provided on the rolling mill's delivery side, as well as those detected by measuring instruments. Some rolls have quality problems such as roll streaks, but in the case of roll breakage, there is a quality problem that cannot be detected by a measuring device such as the roll streaks, so that detection is performed during rolling. I have to do it.
[0011]
As a result of various investigations by the present inventor, it has been found that when the rolling is abnormal, the load current value changes, for example, the load current values at the abnormal rolling stand and the stands before and after it change compared to the normal state.
[0012]
For example, regarding roll breakage among rolling abnormalities, it is assumed that one of the rolls of one stand will break, but at this time, the roll that is broken is not rolled for one roll, The load current value will decrease. On the other hand, the load current value rises by the amount corresponding to the reduction of the load on the broken stand in the next stand.
[0013]
The rolling abnormality detection method of the multi-high rolling mill according to the present invention is made based on such knowledge, detects the load current value in each stand of the multi-high rolling mill, and by the change in the detected load current value, rolling This is to determine whether or not there is an abnormality.
[0014]
More specifically, it is determined whether or not there is a rolling abnormality due to a change in load current value in the rolling abnormality detection method for a multi-high rolling mill according to the present invention described above. (1) Each rolling in each stand of the multi-high rolling mill The load current value is detected at each stand, the load current value of the material currently being rolled is compared with the previous load current value for each stand, and whether or not the difference between the two has exceeded a preset threshold value is determined. (2) The load current value at a stand with a multi-high rolling mill decreases by more than a predetermined threshold value compared to the load current value at normal time, and the load current value at the next stand is compared with the load current value at normal time. is the that turns out was conducted by whether increased predetermined threshold or Te.
[0015]
According to the rolling abnormality detection method for a multi-high rolling mill according to the present invention described above, a quality problem that cannot be detected by a measuring instrument such as a wall thickness gauge or an outer diameter gauge occurs, such as a rolling abnormality due to roll breakage. In particular, it is possible to detect a rolling abnormality of a seamless pipe instantly during rolling.
[0016]
Further, in the rolling abnormality detection method for a multi-high rolling mill according to the present invention described above, when a rolling abnormality is detected, extraction of the next material and subsequent rolls is stopped and a roll replacement instruction is issued. Occurrence can be effectively suppressed.
[0017]
In the rolling abnormality detection method for a multi-high rolling mill according to the present invention, the load current used for determining whether or not there is a rolling abnormality uses an average value excluding a peak value. Moreover, the threshold value is a value that is appropriately determined based on past generation data from the outer diameter and the wall thickness.
[0018]
【Example】
DETAILED DESCRIPTION OF THE PREFERRED EXAMPLE rolling anomaly detection method of a multi-stage rolling mill according to the present invention in FIGS. 1-2.
Figure 1 is a flow chart of a rolling method for detecting abnormality multi-high rolling mill according to the present invention corresponding to claim 1, 2 a flow chart of a rolling method for detecting abnormality multi-high rolling mill according to the present invention corresponding to claim 2 Show.
[0019]
The rolling abnormality detection method for a multi-high rolling mill according to the present invention detects, for example, a load current value in each stand of a multi-high rolling mill such as a stretch reducer, and determines whether or not there is a rolling abnormality by changing the detected load current value. The load current value to be detected is as follows: (1) For each stand, use the load current value of the material being rolled and the load current value during the previous rolling, or (2) that turns out using load current value in the normal rolling and during rolling in stands.
[0020]
For example, when using the load current value of the material being rolled and the load current value during the previous rolling for each stand of (1), the load current values are compared in the order shown in the flowchart of FIG. Then, it is determined whether there is a rolling abnormality.
[0021]
That is, first, the load current value during rolling is detected for each rolling in each stand, and the average value excluding the peak value is calculated. Next, for each stand, the load current value (average value) of the material being rolled is compared with the load current value (average value) during the previous rolling. And, when the difference between the two exceeds the threshold value determined based on the past occurrence data from the outer diameter and the wall thickness in advance, it is judged as rolling failure, while when the difference between the two is less than the threshold value It is judged as good.
[0022]
When using the load current values during rolling and normal rolling in the stand with (2) and the next stand, the load current values are compared in the order shown in the flow chart of FIG. Determine whether roll is abnormal.
[0023]
That is, first, the load current value of the material being rolled in a certain stand is detected, and the average value excluding the peak value is calculated. Then, the load current value (average value) is compared with the load current value (average value) during normal rolling, and the amount of decrease in the load current value (average value) exceeds a preset threshold as described above. In this case, the load current value of the material being rolled in the next stand is detected, and the average value excluding the peak value is calculated. On the other hand, if the amount of increase or decrease in the load current value (average value) of the material being rolled is less than the preset threshold value, it is judged as good.
[0024]
Next, the load current value (average value) of the material being rolled in the next stand is compared with the load current value (average value) during normal rolling, and the increase amount of the load current value (average value) is as described above. When the preset threshold value is exceeded, it is determined that the roll is abnormal. On the other hand, when the amount of increase or decrease in the load current value (average value) of the material being rolled is less than the preset threshold value, It is judged as good.
[0026]
In the above-described rolling abnormality detection method for a multi-high rolling mill according to the present invention, when a rolling abnormality is detected, extraction of the next material and subsequent rolls is stopped and a roll replacement instruction is issued. Occurrence can be effectively suppressed.
[0027]
Next, a description will be given based on the results of experiments conducted to confirm the effect of the rolling abnormality detection method for a multi-high rolling mill according to the present invention.
The experiment is shown in FIG. 2 when an S25C material specified in JIS G 4051 is drawn and rolled using a 6-stand stretch reducer with an outer diameter of 82.6 mm and a wall thickness of 25.4 mm. It was accomplished by carrying out the process of the present invention corresponding to claim 2.
[0028]
FIG. 3 (a) shows the load current value of the material during normal rolling detected in advance in the sixth stand, and FIG. 3 (b) shows the load current value of the material currently rolling in the sixth stand. FIG.
[0029]
FIG. 3 (c) shows the load current value of the material during normal rolling detected in advance in the seventh stand, and FIG. 3 (d) shows the load current of the material currently rolling in the seventh stand. It is the figure which showed the value.
[0030]
When these average values excluding the peak value of the load current value in the sixth stand shown in FIG. 3 (a) and FIG. 3 (b) are compared, in the current rolling in the sixth stand, the average is compared with that in the normal rolling. It can be seen that the value is decreasing.
[0031]
On the other hand, when the average value excluding the peak value of the load current value in the seventh stand shown in FIG. 3 (c) and FIG. 3 (d) is compared, in the current rolling in the seventh stand, the average is higher than in the normal rolling. It can be seen that the value has increased.
[0032]
In this experiment, since the decrease amount of the sixth stand and the increase amount of the seventh stand were both larger than the threshold value determined in advance as described above, it was determined that the rolling was defective.
[0033]
【The invention's effect】
As described above, according to the present invention, a rolling abnormality of a multi-high rolling mill is detected early during rolling, the continuation of abnormal rolling is prevented, and quality nonconforming materials such as rolls and slips are reduced. Can do.
[Brief description of the drawings]
FIG. 1 is a flowchart of a rolling abnormality detection method for a multi-high rolling mill according to the present invention corresponding to claim 1 ;
FIG. 2 is a flowchart of a rolling abnormality detection method for a multi-high rolling mill according to the present invention corresponding to claim 2 ;
FIG. 3 is a diagram showing an embodiment of a rolling abnormality detection method for a multi-high rolling mill according to the present invention corresponding to claim 2 , wherein (a) and (b) are in a sixth stand, and (c) and (d) are It is the figure which showed the load current value of the material in a 7th stand, (a) (c) is the figure at the time of the normal rolling previously detected, (b) (d) is the figure which showed the present rolling time.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002105179A JP4178825B2 (en) | 2002-04-08 | 2002-04-08 | Method for detecting rolling anomalies in multi-high mills |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002105179A JP4178825B2 (en) | 2002-04-08 | 2002-04-08 | Method for detecting rolling anomalies in multi-high mills |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003290827A JP2003290827A (en) | 2003-10-14 |
| JP4178825B2 true JP4178825B2 (en) | 2008-11-12 |
Family
ID=29243114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002105179A Expired - Fee Related JP4178825B2 (en) | 2002-04-08 | 2002-04-08 | Method for detecting rolling anomalies in multi-high mills |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4178825B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109522660B (en) * | 2018-11-22 | 2023-01-17 | 阳春新钢铁有限责任公司 | Detection method for roll breakage of rolling mill in continuous rolling production line, storage medium and computing equipment |
| CN114337469B (en) * | 2021-12-31 | 2023-11-28 | 中冶赛迪信息技术(重庆)有限公司 | Laminar flow roller way motor fault detection method, system, medium and electronic terminal |
-
2002
- 2002-04-08 JP JP2002105179A patent/JP4178825B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003290827A (en) | 2003-10-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2656936B1 (en) | Hot rolling equipment and hot rolling method | |
| WO2007015484A1 (en) | Device and method for detecting flaw on tube | |
| JP4697605B2 (en) | Method for controlling constant diameter rolling of tube and control apparatus for constant diameter rolling | |
| JP4178825B2 (en) | Method for detecting rolling anomalies in multi-high mills | |
| JP2007069234A (en) | Method and device for monitoring passage of sheet on thick steel plate straightening line | |
| CN103282135B (en) | Method of detecting defects in rotary piercing, seamless pipe manufacturing method | |
| JP2003001315A (en) | Cold rolling method for steel strip | |
| WO2012077334A1 (en) | Method for manufacturing seamless pipe | |
| JP5218259B2 (en) | Sheet rolling mill and control method thereof | |
| JP3567837B2 (en) | Method of learning the start time of pipe end wall thickness control of a rolling mill | |
| JP5275904B2 (en) | Manufacturing apparatus and manufacturing method for internally grooved tube | |
| JP2013116489A (en) | Method for detecting fracture in strip in hot rolling finishing mill | |
| JP2002239838A (en) | Abnormality monitoring method in female threading process | |
| JPS6281209A (en) | Operation stop method in unusual condition for continuous rolling mill | |
| JP3487276B2 (en) | Constant diameter rolling device and constant diameter rolling method for metal tube | |
| JP4501116B2 (en) | Scratch detection apparatus and method for blank tube | |
| JP2010214422A (en) | Temper rolling method of steel sheet | |
| JPH0484624A (en) | Method for deciding generation of perforation in material to be rolled in mandrel mill | |
| JP2000015315A (en) | Method for controlling position of work roll and device therefor | |
| JP2004017066A (en) | Thickness control method for tube-rolling mill | |
| JP2007105740A (en) | Method of wet-type skin pass rolling, and rolling mill therefor | |
| JPH08300013A (en) | Bar stripping method in mandrel mill | |
| JP2008030079A (en) | Hot-rolling method | |
| CN117310477A (en) | Method for detecting operation state of auxiliary winding roller of strip steel winding machine | |
| CN110907497A (en) | Strip steel surface wrinkle detection device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20041119 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20080321 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20080422 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20080620 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20080805 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20080818 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 Ref document number: 4178825 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110905 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120905 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120905 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130905 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130905 Year of fee payment: 5 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130905 Year of fee payment: 5 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130905 Year of fee payment: 5 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |