JPH0484624A - Method for deciding generation of perforation in material to be rolled in mandrel mill - Google Patents
Method for deciding generation of perforation in material to be rolled in mandrel millInfo
- Publication number
- JPH0484624A JPH0484624A JP2199885A JP19988590A JPH0484624A JP H0484624 A JPH0484624 A JP H0484624A JP 2199885 A JP2199885 A JP 2199885A JP 19988590 A JP19988590 A JP 19988590A JP H0484624 A JPH0484624 A JP H0484624A
- Authority
- JP
- Japan
- Prior art keywords
- load
- rolling
- comparator
- rolled
- fluctuation level
- 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
- 239000000463 material Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims description 16
- 238000005096 rolling process Methods 0.000 abstract description 38
- 238000010586 diagram Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/78—Control of tube rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
- B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はマンドレルミルにおける被圧延材穴明判定方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for determining holes in a rolled material in a mandrel mill.
［従来の技術］
マンドレルミルによる鋼管の圧延は、次のようにして行
なわれる。すなわち、第５図のように、マンドレルバ３
はマンドレルバ−２１が挿入挿入された被圧延材２４を
、交互に１８０度対向して配置した複数段の孔型ロール
２２に送り込み、孔型ロール２２とマンドレルバ−２１
間で、前記被圧延材２４を圧延する。このマンドレルミ
ル２３において、被圧延材２４の圧延中に、マンドレル
バ−２１を外力で拘束する圧延機をリストレインドマン
ドレルミルと称し、マンドレルバ−２１を外力で拘束し
ないものフルフロー１〜マンドレルミルと称する。[Prior Art] Rolling of steel pipes using a mandrel mill is performed as follows. That is, as shown in FIG.
The material to be rolled 24 into which the mandrel bars 21 have been inserted is fed into a plurality of grooved rolls 22 arranged alternately facing each other at 180 degrees, and the grooved rolls 22 and the mandrel bars 21
In between, the material to be rolled 24 is rolled. In this mandrel mill 23, a rolling mill in which the mandrel bar 21 is restrained by an external force during rolling of the material to be rolled 24 is called a restrained mandrel mill, and a mill in which the mandrel bar 21 is not restrained by an external force is called a full flow 1 to mandrel mill. .
このようなマンドレルミル２３による圧延においては、
圧延中の２基の圧延ロール２２間の被圧延材２４にかか
る張力が何らかの理由で過大となった場合、被圧延材２
４に円孤状の穴明が発生ずる。この穴明は、鋼管の品質
上の重大欠陥であるので、穴明が発生しているか否かを
確実に把握するようにするとともに、穴明が発生したら
早急に穴明の部分を圧延ライン外に取り除くようにしな
ければならない。In rolling by such a mandrel mill 23,
If the tension applied to the rolled material 24 between the two rolling rolls 22 during rolling becomes excessive for some reason, the rolled material 2
4, a circular hole appears. This hole is a serious defect in the quality of steel pipes, so it is necessary to be sure to understand whether or not a hole has occurred, and if a hole occurs, immediately remove the hole from the rolling line. It must be removed immediately.
上述した被圧延材２４の穴明発生監視方法は、従来圧延
後の鋼管を冷却するための冷却床で目視により行なうか
、穴明が発生すると穴明部分を圧延中に圧延荷重が急激
に低下することからロール荷重チャートを見て監視する
という方法にたよっていた。The above-mentioned method for monitoring the occurrence of holes in the rolled material 24 is conventionally carried out by visual observation on a cooling bed for cooling steel pipes after rolling, or when holes occur, the rolling load suddenly decreases while rolling the holed portion. Therefore, we relied on the method of monitoring by looking at the roll load chart.
［発明が解決しようとする課題］
しかしながら、従来の被圧延材に発生ずる穴明を監視す
る方法には、次のような問題点かった。[Problems to be Solved by the Invention] However, the conventional method for monitoring the occurrence of holes in a rolled material has the following problems.
（］、 ）目視点検による場合は、穴明を点検するため
の要員を特別に必要とする。( ], ) If visual inspection is used, special personnel are required to inspect the holes.
（２）ロール荷重チャートを見て監視する場合は、穴明
は局部的なごく僅かな間に発生する現象であり、３０ｍ
近くももある素管の全長にわたって、また圧延する鋼管
全数をロール荷重チャートの判読により監視するのは不
可能である。(2) When monitoring by looking at the roll load chart, it is important to note that hole formation is a phenomenon that occurs locally and over a short period of time, and that
It is impossible to monitor the entire length of a raw pipe or the total number of steel pipes to be rolled by reading a roll load chart.
したがって、ロール荷重チャートの監視以外に、穴明の
兆候と考えられる次のようなものの発生の有無をもチエ
ツクしている。Therefore, in addition to monitoring the roll load chart, we also check for the occurrence of the following symptoms, which are considered to be signs of holes.
（１）圧延後の被圧延材の黒ずみの発生（穴明部は第６
図のように過剰テンションによりあるピッチで薄肉とな
っているため、他の部分よりも速く冷却され低温となり
黒ずんでいる。）（２）内面への内渡の発生
（第７図および第８図）：
第７図のように鋼管の内面に波打ちが発生ずる。この波
打ちの発生状況は、第８図の拡大図に示すようにように
４〜１５１１ＩＮの肉厚（１）に対して、０ 、５〜２
、０ ｍｍ 薄い部分（Ａ）が１００〜３００市ピツ
チ（Ｌ）になるような形で発生している。(1) Occurrence of darkening on the rolled material after rolling (the hole area is
As shown in the figure, because the wall is thinner at certain pitches due to excessive tension, it cools down faster than other parts, becoming colder and turning black. ) (2) Occurrence of internal waving on the inner surface (Figs. 7 and 8): As shown in Fig. 7, waving occurs on the inner surface of the steel pipe. As shown in the enlarged view of Fig. 8, the occurrence of this waving is as follows:
, 0 mm Thin part (A) is generated in such a way that it is 100 to 300 mm thick (L).
しかしながら、上記のようなチエツクを行なう方法にお
いても、チエツクのための要員を張りっけにし、しかも
完全な確認ができるようにするため、圧延能率を落とさ
ざるを得ないという問題点があった。However, even in the method of carrying out the above-mentioned checking, there is a problem that the rolling efficiency has to be reduced in order to have all the personnel for the check and to be able to perform complete confirmation.
この発明は、従来技術の上記のような問題点を解消し、
圧延中の被圧延材に発生する穴明の有無を容易にかつ精
度よく判定することのできるマンドレルミルにおける被
圧延材穴明発生判定方法を提供することを目的としてい
る。This invention solves the above-mentioned problems of the prior art,
It is an object of the present invention to provide a method for determining the occurrence of holes in a rolled material in a mandrel mill, which can easily and accurately determine the presence or absence of holes in a rolled material during rolling.
［課題を解決するための手段］
この発明に係るマンドレルミルにおける被圧延材穴明発
生判定方法は、ロールチョックに荷重検出器を配置し、
この荷重検出器により検出した荷重信号をゲートを通し
て荷重の変動レベルを設定できるコンパレータに送り、
荷重の変動レベルが前記コンパレータに設定した荷重の
変動レベルを上まわるときには、コンパレータがら判定
回路に信号を送って警報を発するものである。[Means for Solving the Problems] A method for determining the occurrence of holes in a rolled material in a mandrel mill according to the present invention includes disposing a load detector on a roll chock,
The load signal detected by this load detector is sent through a gate to a comparator that can set the load fluctuation level.
When the load fluctuation level exceeds the load fluctuation level set in the comparator, the comparator sends a signal to the determination circuit to issue an alarm.
また、上記発明の実施態様としてのマンドレルミルにお
ける被圧延材穴明発生判定方法は、コンパレータにひき
つづいてカウント回路を設け、コンパレータに設定した
荷重の変動レベルを」二まわる荷重変動の発生回数をカ
ウントして、カウント数が一定値を超えた場合判定回路
に信号を送って警報を発するものである。Further, in the method for determining the occurrence of holes in a rolled material in a mandrel mill as an embodiment of the above invention, a counting circuit is provided following the comparator, and the number of occurrences of load fluctuations that are twice the load fluctuation level set in the comparator is counted. When the count exceeds a certain value, a signal is sent to a determination circuit to issue an alarm.
［作用］
この発明に係るマンドレルミルにおける被圧延材穴明発
生判定方法は、ロールチョックに荷重検出器を配置し、
この荷重検出器により検出した荷重信号をゲートを通し
て荷重の変動レベルを設定できるコンパレータに送り、
荷重の変動レベルが前記コンパレータに設定した荷重の
変動レベルを上まわるときには、コンパレータから判定
回路に信号を送って警報を発するようにしている。この
ようにしたのは、次のような理由によるものである。す
なわち、圧延中の素管の被圧延材に過剰な張力により穴
明が発生した場合、穴明部分が圧延される時には、穴明
部分には被圧延材が無いなめ、圧延荷重が急激に低下す
る。したがって、こ６〜
の急激な圧延荷重の低下を把握すれば穴明の発生が確認
できるので、コンパレータに穴明部属延時の荷重の変動
レベル程度の荷重変動レベルを設定し、ロールチョック
に配置した荷重検出器からの荷重信号をゲートを通して
このコンパレータに送り、設定値と比較して圧延荷重の
変動レベルが大きければ、穴明発生と判定し、警報を発
するようにしたのである。なお、ゲートを設けたのは、
素管のマンドレルミルへの噛み込み時および噛み離し時
には、常時圧延荷重が大きく変動するので、これらの部
分を除いて判定するようにしたためである。[Function] The method for determining the occurrence of holes in a rolled material in a mandrel mill according to the present invention includes arranging a load detector on a roll chock,
The load signal detected by this load detector is sent through a gate to a comparator that can set the load fluctuation level.
When the load fluctuation level exceeds the load fluctuation level set in the comparator, a signal is sent from the comparator to a determination circuit to issue an alarm. This was done for the following reasons. In other words, if a hole occurs due to excessive tension in the rolled material of the raw pipe during rolling, when the holed part is rolled, there is no rolled material in the holed part, so the rolling load decreases rapidly. do. Therefore, the occurrence of a hole can be confirmed by detecting the sudden drop in rolling load from 6 to 6. Therefore, the comparator is set at a load fluctuation level that is approximately the same as the load fluctuation level when rolling the hole, and the load placed on the roll chock is The load signal from the detector is sent to this comparator through the gate, and if the variation level of the rolling load is large compared to the set value, it is determined that a hole has occurred and an alarm is issued. In addition, the gate was set up by
This is because the rolling load constantly fluctuates greatly when the raw tube is inserted into the mandrel mill and when it is removed from the mandrel mill, so these portions were excluded from the determination.
また、上記発明の実施態様としてのマンドレルミルにお
ける被圧延材穴明発生判定方法において、コンパレータ
にひきつづいてカウント回路を設け、コンパレータに設
定した荷重の変動レベルを上まわる荷重変動の発生回数
をカウントして、カウント数が一定値を超えた場合判定
回路に信号を送って警報を発するようにしたのは、発生
回数１回のみで判定すると、ノイズにより被圧延材穴明
を誤検出する可能性が高いからである。Further, in the method for determining the occurrence of holes in a rolled material in a mandrel mill as an embodiment of the above invention, a counting circuit is provided following the comparator to count the number of occurrences of load fluctuation exceeding a load fluctuation level set in the comparator. The reason why we decided to send a signal to the judgment circuit and issue an alarm when the count exceeds a certain value is because if the judgment is based on only one occurrence, there is a possibility of false detection of holes in the rolled material due to noise. This is because it is expensive.
［実施例］
本発明の１実施例のマンドレルミルにおける被圧延材穴
明発生判定方法を第１図および第２図により説明する。[Example] A method for determining the occurrence of holes in a rolled material in a mandrel mill according to an example of the present invention will be described with reference to FIGS. 1 and 2.
第１図は、本発明の１実施例のマンドレルミルにおける
被圧延材穴明発生判定方法に使用する機器構成を示す説
明図である。マンドレルミルのロールチョックに設けた
荷重検出器１により圧延荷重を検出し、検出した荷重信
号をゲート２を通してコンパレータ３に送る。ゲー１−
２を設けたのは、ロールへの被圧延材噛み込み時および
ロールからの被圧延材噛み離し時には大きな圧延荷重の
変動があるからであり、これらの部分の圧延荷重の変動
は、被圧延材穴明発生判定の対象外とするためである。FIG. 1 is an explanatory diagram showing the equipment configuration used in a method for determining the occurrence of holes in a rolled material in a mandrel mill according to an embodiment of the present invention. A rolling load is detected by a load detector 1 provided on a roll chock of a mandrel mill, and the detected load signal is sent to a comparator 3 through a gate 2. Game 1-
2 was provided because there are large fluctuations in the rolling load when the rolled material is bitten into the rolls and when the rolled material is separated from the rolls. This is to exclude it from the determination of the occurrence of holes.
コンパレータ３には、あらかじめ穴明部分を圧延すると
きに発生する荷重の変動レベルに近い高いレベルの荷重
変動レベルが設定してあり、荷重検出器１から送られた
荷重信号の時々刻々の変動量は、この設定された荷重の
変動レベルと常時比較され、検出した荷重変動レベルが
設定値を上まわるときには、コンパレータ３がら判定回
路４に信号を送って警報を発するようになっている。マ
ンドレルミルにおいては、圧延ロールは隣り合うスタン
ド毎にロール軸が１８０度旋回するようにして配置され
ているので、被圧延材の同一個所を圧延した時の荷重は
、１．３．５スタンドとが２．４．．６スタンドとがい
うように間欠的にしが把握できないので、前記荷重検出
器１は少なくとも隣り合う２スタンドに設ける必要があ
る。The comparator 3 is set in advance to a high load fluctuation level close to the load fluctuation level that occurs when rolling the holed part, and the amount of fluctuation in the load signal sent from the load detector 1 is calculated in advance. is constantly compared with the set load fluctuation level, and when the detected load fluctuation level exceeds the set value, the comparator 3 sends a signal to the determination circuit 4 to issue an alarm. In a mandrel mill, the rolling rolls are arranged so that the roll axis rotates 180 degrees in each adjacent stand, so the load when rolling the same part of the material to be rolled is 1.3.5 stands. is 2.4. ．． Since the load cannot be detected intermittently as in the case of 6 stands, the load detectors 1 need to be provided in at least 2 adjacent stands.
第２図は第１図の場合に加えて、コンパレータ３の後に
回数設定器５を有するカウント回路６を設けた例であり
、設定荷重変動レベルを上回る荷重変動の発生回数を例
えば２０ ｍ５ｅｃ、以下の短い時間毎に１回としてカ
ウントし、そのカウント回数が連続して一定値以」二と
なった場合（連続しないとノイズの可能性があるため）
のみ判定回路４に信号を送って警報を発するようにして
おり、ノイズによる誤検出を防止している。Fig. 2 shows an example in which, in addition to the case shown in Fig. 1, a count circuit 6 having a number setting device 5 is provided after the comparator 3, and the number of occurrences of load fluctuation exceeding the set load fluctuation level is set to 20 m5ec or less, for example. Each short period of time is counted as one time, and if the number of counts is continuously less than a certain value (because if it is not continuous, there is a possibility of noise)
A signal is sent to the determination circuit 4 to issue an alarm, thereby preventing false detection due to noise.
第３図は第２図の装置構成の場合の被圧延材穴明検出フ
ローを示すものである。荷重検出器が荷重を検出すると
タイマーが作動し、一定時間後にカウント回路が閉じら
れカウント準備ができる。FIG. 3 shows the flow of detecting holes in a rolled material in the case of the apparatus configuration shown in FIG. 2. When the load detector detects a load, a timer is activated, and after a certain period of time, the counting circuit is closed and ready for counting.
そして荷重変動がコンパレータにより判断され、荷重変
動が一定値Ａ以上のときにはある時間（例えば、２０
ｍ５ｅｃ、 ）を区切って１回としてカウントし、信号
をカウント回路に送る。そしてカウント数があらかじめ
定められた回数ＮＡ以以上ときにはアラームを発する。Then, the load fluctuation is judged by a comparator, and when the load fluctuation is equal to or higher than a certain value A, a certain period of time (for example, 20
m5ec, ) is counted as one time, and a signal is sent to the counting circuit. Then, when the count number exceeds a predetermined number of times NA, an alarm is generated.
なお、圧延終了時の荷重降下を穴明と判定しないため、
検出フローを前スタンドのロードオフまでとしている。In addition, since the load drop at the end of rolling is not judged as a hole,
The detection flow is up to the load off of the front stand.
第４図（ａ）〜（ｇ＞は、第１表に示す圧延材をマンド
レルミルで圧延したときのＮ［Ｌ １スタンドからＮｏ
、 ７スタンドまでのそれぞれのスタンドでの圧延荷重
の経時変化を示す荷重チャートである。Figures 4(a) to (g>) show the N [L from 1 stand to No.
, is a load chart showing changes over time in the rolling load at each stand up to 7 stands.
第１表
［発明の効果］
本発明により、マンドレルミルにおける被圧延材穴明発
生の判定が容易にしかも正確に行なえる。Table 1 [Effects of the Invention] According to the present invention, it is possible to easily and accurately determine the occurrence of holes in a rolled material in a mandrel mill.
該荷重チャー１〜の左から右へと圧延が進行しているが
、第４図（Ｃ）のＮｏ、 ３スタンドと第４図（ｅ）の
Ｎ［Ｌ ５スタンドの荷重チャートを見ると、いずれも
圧延の１／３あなりで荷重が１００トン近く急激に低下
している。これはＮｏ、 １スタンドからＮ［Ｌ ３ス
タンドの間で被圧延材に過剰なテンションが作用したた
めに被圧延材に穴明が発生し、穴明部分がＮ［Ｌ ３ス
タンドとＮ［Ｌ ５スタンドでロールのカリバー底に接
したため、圧下反力が減り圧延荷重が急激に低下したも
のである。このように穴明部分が圧下されると、圧延荷
重が急激に低下するので、前述したような方法で容易に
被圧延材穴明の発生が判定できるのである。The rolling progresses from left to right for the load chars 1 to 1, but looking at the load charts for stand No. 3 in Figure 4(C) and stand N[L5 in Figure 4(e), In both cases, the load suddenly decreased by nearly 100 tons after 1/3 of the rolling process. This is No. Excessive tension was applied to the material to be rolled between stand 1 and stand N[L 3. Holes were generated in the material to be rolled, and the hole area was between stand 1 and stand N[L 5. Because the stand touched the bottom of the caliber of the roll, the rolling reaction force decreased and the rolling load suddenly decreased. When the holed portion is rolled down in this manner, the rolling load is rapidly reduced, so the occurrence of holes in the rolled material can be easily determined by the method described above.
第１図は本発明の１実施例のマンドレルミルにおける被
圧延材穴明発生判定方法を示すブロック図、第２図は本
発明の他の実施例を示すブロック図、第３図は穴明検出
フローを示す説明図、第４図は圧延荷重を示すチャー１
・図、第５図はマンドレルミルでの素管の圧延状態を示
す説明図、第６図は穴明に起因する鋼管の黒ずみを示す
説明図、第７図は穴明に起因する鋼管内面の波打ちの発
生状況を示す説明図、第８図は第７図の一部拡大図であ
る。
１・・・荷重検出器、２・・ゲート、３・・コンパレー
タ、４・判定回路、５・・回数設定器、６・カウント回
路。Fig. 1 is a block diagram showing a method for determining the occurrence of holes in a rolled material in a mandrel mill according to one embodiment of the present invention, Fig. 2 is a block diagram showing another embodiment of the present invention, and Fig. 3 is a block diagram showing the detection of holes in a rolled material. An explanatory diagram showing the flow, Figure 4 is Char 1 showing the rolling load.
・Figure 5 is an explanatory diagram showing the rolled state of the raw pipe in a mandrel mill, Figure 6 is an explanatory diagram showing the darkening of the steel pipe due to pitting, and Figure 7 is an explanatory diagram showing the darkening of the steel pipe due to pitting. FIG. 8 is a partially enlarged view of FIG. 7, which is an explanatory diagram showing the occurrence of waving. 1. Load detector, 2. Gate, 3. Comparator, 4. Judgment circuit, 5. Number of times setting device, 6. Count circuit.
Claims (2)
検出器により検出した荷重信号をゲートを通して荷重の
変動レベルを設定できるコンパレータに送り、荷重の変
動レベルが前記コンパレータに設定した荷重の変動レベ
ルを上まわるときには、コンパレータから判定回路に信
号を送つて警報を発することを特徴とするマンドレルミ
ルにおける被圧延材穴明発生判定方法。(1) A load detector is placed on the roll chock, and the load signal detected by this load detector is sent through a gate to a comparator that can set the load fluctuation level, and the load fluctuation level is set to the load fluctuation level set in the comparator. 1. A method for determining the occurrence of holes in a rolled material in a mandrel mill, which comprises sending a signal from a comparator to a determination circuit to issue an alarm when the number exceeds the limit.
、コンパレータに設定した荷重の変動レベルを上まわる
荷重変動の発生回数をカウントして、カウント数が一定
値を超えた場合判定回路に信号を送って警報を発するこ
とを特徴とする請求項１のマンドレルミルにおける被圧
延材穴明発生判定方法。(2) A counting circuit is provided following the comparator to count the number of times the load fluctuation occurs that exceeds the load fluctuation level set in the comparator, and if the count exceeds a certain value, it sends a signal to the judgment circuit to issue an alarm. 2. A method for determining the occurrence of holes in a rolled material in a mandrel mill according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2199885A JPH0484624A (en) | 1990-07-27 | 1990-07-27 | Method for deciding generation of perforation in material to be rolled in mandrel mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2199885A JPH0484624A (en) | 1990-07-27 | 1990-07-27 | Method for deciding generation of perforation in material to be rolled in mandrel mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0484624A true JPH0484624A (en) | 1992-03-17 |
Family
ID=16415228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2199885A Pending JPH0484624A (en) | 1990-07-27 | 1990-07-27 | Method for deciding generation of perforation in material to be rolled in mandrel mill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0484624A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007015484A1 (en) * | 2005-08-02 | 2007-02-08 | Sumitomo Metal Industries, Ltd. | Device and method for detecting flaw on tube |
| JP2007061904A (en) * | 2005-08-02 | 2007-03-15 | Sumitomo Metal Ind Ltd | Device and method for detecting flaw of tube stock |
| EP1907143B1 (en) * | 2006-07-14 | 2009-12-16 | SMS Siemag AG | Device for rotationally locking the supporting roll balanced architecture of roll stands |
| JP2013516325A (en) * | 2010-01-05 | 2013-05-13 | エスエムエス インス エス．ピー．エー． | Tube rolling plant |
-
1990
- 1990-07-27 JP JP2199885A patent/JPH0484624A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007015484A1 (en) * | 2005-08-02 | 2007-02-08 | Sumitomo Metal Industries, Ltd. | Device and method for detecting flaw on tube |
| JP2007061904A (en) * | 2005-08-02 | 2007-03-15 | Sumitomo Metal Ind Ltd | Device and method for detecting flaw of tube stock |
| EP1918034A1 (en) * | 2005-08-02 | 2008-05-07 | Sumitomo Metal Industries, Ltd. | Device and method for detecting flaw on tube |
| EP1918034A4 (en) * | 2005-08-02 | 2009-08-26 | Sumitomo Metal Ind | Device and method for detecting flaw on tube |
| US7707865B2 (en) | 2005-08-02 | 2010-05-04 | Sumitomo Metal Industries, Ltd. | Flaw detection apparatus and method for tubes |
| JP4501116B2 (en) * | 2005-08-02 | 2010-07-14 | 住友金属工業株式会社 | Scratch detection apparatus and method for blank tube |
| EP1907143B1 (en) * | 2006-07-14 | 2009-12-16 | SMS Siemag AG | Device for rotationally locking the supporting roll balanced architecture of roll stands |
| JP2013516325A (en) * | 2010-01-05 | 2013-05-13 | エスエムエス インス エス．ピー．エー． | Tube rolling plant |
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