JP2004237328A - How to collect test samples for billet welds - Google Patents

How to collect test samples for billet welds Download PDF

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Publication number
JP2004237328A
JP2004237328A JP2003030045A JP2003030045A JP2004237328A JP 2004237328 A JP2004237328 A JP 2004237328A JP 2003030045 A JP2003030045 A JP 2003030045A JP 2003030045 A JP2003030045 A JP 2003030045A JP 2004237328 A JP2004237328 A JP 2004237328A
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Prior art keywords
rolled
cut
billet
welded portion
test sample
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JP4199554B2 (en
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Kazuto Mitani
和人 三谷
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JFE Engineering Corp
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JFE Engineering Corp
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Abstract

【課題】連続圧延を中断することなく、かつ製品歩留を低下させないでビレット溶接部の試験用サンプルを採取する。
【解決手段】連続的に走間溶接されて圧延スタンド列5に送り込まれるビレット1および2の溶接部3を、圧延された被圧延材が分割シャ−6で分割切断され、冷却床7で冷却されるまでトラッキングし、分割切断される被圧延材の搬送方向先頭に溶接部3が位置すると判断されたときには、その被圧延材の切断長さを試験用サンプルとして採取する試験材の長さ分だけ長く切断するように制御することを特徴とするビレット溶接部の試験用サンプルの採取方法。
【選択図】 図1
A test sample of a billet weld is collected without interrupting continuous rolling and without reducing product yield.
A welded portion (3) of billets (1) and (2), which are continuously run-welded and sent to a rolling stand row (5), is subjected to split cutting of a rolled material by a split shear (6) and cooled by a cooling floor (7). And when it is determined that the welded portion 3 is located at the head of the material to be rolled to be divided and cut in the transport direction, the cut length of the material to be rolled is determined by the length of the test material to be sampled as a test sample. A method for collecting a test sample of a billet weld, characterized in that the sample is controlled to be cut only for a long time.
[Selection diagram] Fig. 1

Description

【0001】
【発明の属する技術分野】
本発明は、連続的に走間溶接されて圧延スタンド列に送り込まれるビレットから圧延された棒鋼、線材、形鋼等の被圧延材から、溶接部の試験用サンプルを採取する方法に関する。
【0002】
【従来の技術】
線材、棒鋼、形鋼等を省エネルギー・高能率に製造することを目的とした従来の連続圧延法においては、加熱炉からビレットを1本ずつ抽出し、フラッシュバット溶接機により先行するビレットの後端と後行のビレットの先端とを溶接し、次いでその溶接部のバリをスカーフア等で除去し、この連続したビレットを誘導加熱装置により圧延に必要な温度に昇温した後に、圧延機列にて連続圧延するものがある。
【0003】
また、加熱炉から一旦抽出したビレットを溶接接続して連続化し、再度同加熱炉で昇温する連続圧延法もある。
【0004】
このような連続圧延におけるビレットの溶接部は、圧延後分割シャ−により所定の長さに分割切断された被圧延材のいずれかに、またその長手方向位置をさまざま変えた状態で存在する。
【0005】
被圧延材に存在する溶接部は、溶接時のスパッタ等の不純分を含んでいる可能性があるので、溶接部以外の部分と比較して、材質上劣る可能性があるので、定期的に溶接部から試験用のサンプルを採取し、材料試験を行う必要がある。
【0006】
従来、このような試験用のサンプルを被圧延材から採取する方法としては、溶接部のトラッキングを行う方法が確立していなかったので、溶接部が分割切断された被圧延材のうちのどの圧延材に、またどの位置にあるのかを、被圧延材の概略の全体圧延長から追いかけていき、さらには被圧延材の表面の色の違いや色の変化等から判断して採取するようにしていた。
【0007】
また、他の方法としては、溶接部のサンプルを採るだけのための圧延を行って、その被圧延材からサンプルを採取するという方法がある。
【0008】
なお、近年においては、連続圧延における溶接部をトラッキングする方法が種々提案されている(例えば、特許文献1参照。)。
【0009】
【特許文献1】
特開平10−34212
【0010】
【発明が解決しようとする課題】
上述した従来の連続圧延における溶接部の試験用サンプルを採取する方法には、次のような問題点がある。
【0011】
いずれも圧延を中断して行わなければならないため、また試験用サンプルを採取する溶接部の位置を特定するのに時間がかかるため、さらには試験用サンプルを採取する場所が一定場所とはならないため、生産性が阻害される。
【0012】
また、試験用サンプルを採取する溶接部の位置が、切断された被圧延材の中間部分にある場合には、試験用サンプル採取にともない端尺が発生し、スクラップにせざるを得ない部分があるため、製品歩留が低下する。
【0013】
この発明は、従来技術の上述のような問題点を解消するためになされたものであり、連続圧延を中断することなく溶接部の試験用サンプルを採取することが出来、製品歩留も低下しないビレット溶接部の試験用サンプルの採取方法を提供することを目的としている。
【0014】
【課題を解決するための手段】
本発明に係る第一のビレット溶接部の試験用サンプルの採取方法は、連続的に走間溶接されて圧延スタンド列に送り込まれるビレットの溶接部を、圧延された被圧延材が分割シャ−で分割切断され、冷却床で冷却されるまでトラッキングし、分割切断される被圧延材の搬送方向先頭に溶接部が位置すると判断されたときには、その被圧延材の切断長さを試験用サンプルとして採取する試験材の長さ分だけ長く切断するように制御するものである。
【0015】
本発明に係る第一のビレット溶接部の試験用サンプルの採取方法においては、ビレットの溶接位置を被圧延材の圧延長および溶接部と母材部との間に温度変化があることを利用して検出してトラッキングし、圧延ラインから分割切断ラインおよび冷却床に至るまでの溶接位置をコントロ−ラで認識する。
【0016】
そして、製品長さと冷却床の長さとから決定される分割シャ−の切断長さ、および溶接部のトラッキングから、溶接部が冷却床の端部にくるポイントを演算し、溶接部が冷却床の端部にくる、換言すれば分割切断される被圧延材の搬送方向先頭に溶接部が位置すると判断されたときには、被圧延材の分割シャ−で切断されるときの切断長さを、サンプリングする試験材の長さ分だけ長くし、試験材を採取しても、試験材採取後にその被圧延材を最終製品長さに分割するときに、端尺が発生しないようにする。
【0017】
したがって、試験用サンプル採取のために、生産ラインを停止させることがないとともに、試験用サンプル採取にともなって製品歩留が大きく低下させることもない上に、試験用サンプル採取場所を一定の場所にすることができ、作業が簡素化できる。
【0018】
また、本発明に係る第二のビレット溶接部の試験用サンプルの採取方法は、連続的に走間溶接されて圧延スタンド列に送り込まれるビレットの溶接部を、圧延された被圧延材が分割シャ−で分割切断され、冷却床で冷却されるまでトラッキングし、トラッキング結果から分割切断される複数の被圧延材のうちのどの被圧延材のどの部位に溶接部があるかを画面表示し、表示された画面に基づいて溶接部の試験用サンプルを採取するものである。
【0019】
本発明に係る第二のビレット溶接部の試験用サンプルの採取方法においては、上記温度変化部をトラッキングする方法と、圧延開始時からの圧延長によりトラッキングする方法とを組合わせることにより、溶接部の位置を正確にトラッキングするようにしている。
【0020】
そのため、溶接部が冷却床の端部にうまくこない場合でも、冷却床のどの位置にある被圧延材に溶接部があるのか、また溶接部は被圧延材の長手方向どの位置にあるのかを画面に表示し、いつでもオペレ−タがその部位を特定し、サンプルが採取できるようにしている。
【0021】
したがって、この採取方法の場合も、生産ラインの停止を極力少なくなるようにすることができるとともに、製品歩留の低減も抑えることができる。
【0022】
【発明の実施の形態】
本発明の実施の形態を、図面を参照して説明する。図1は、本発明のビレット溶接部の試験用サンプルの採取方法において、ビレットの溶接部をトラッキングする方法を示す図である。
【0023】
隣り合うビレット1およびは2は、溶接機4により走間溶接される。隣り合うビレット1およびは2間に形成される溶接部3は、No.1−STD(圧延スタンドをSTDと略称する)、No.2−STD、……No.(N−1)−STD、No.N−STDと連続圧延スタンド5を通過し、所定の製品寸法の断面に圧延される。
【0024】
そして、圧延された被圧延材は、分割シャ−6により冷却床7で冷却可能な長さ(最終製品長の複数倍の長さ)に分割切断される。
【0025】
ビレットの溶接部3が圧延されていくとき、ビレットが溶接機4からNo.1−STDに搬送されるときの搬送テ−ブルの回転数rv、各圧延スタンドのロ−ル回転数rv、rv、……rv(N−1)、rvおよび最終圧延スタンドNo.N−STDの出側に設置されている表面温度監視用温度計8で測定した被圧延材の表面温度Tが制御装置9に送られる。
【0026】
制御装置9には、あらかじめ切断長設定器10により、被圧延材を分割シャ−6で分割切断するときの切断長が設定されており、制御装置9からの指令により、設定された切断長となるように、分割シャ−6が作動するようになっている。
【0027】
また、制御装置9においては、上述した各圧延スタンドのロ−ル回転数、ロ−ル径に基づき、溶接部3の圧延ラインにおけるトラッキングするとともに、表面温度監視用温度計8で測定した温度の変化に基づき、正確な溶接点が把握できるようになっている。
【0028】
図2は、溶接部3が被圧延材の長手方向の温度変化に基づき、把握できることを示す溶接部前後の温度変化のグラフである。図において、a点およびc点は他の部分の温度Tよりも温度がΔTだけ低下する点、b点は他の部分よりも温度がΔTだけ上昇する点である。
【0029】
a点およびc点で表面温度が低下するのは、溶接時に給電用のジョウが隣り合うビレットを掴んだことによるものであり、b点で温度が上昇しているのは、アップセット溶接によるものである。
【0030】
このようなビレット溶接部3前後の温度変化は、常に同じパタ−ンで表れるものであり、このようなパタ−ンにより容易に溶接部の位置を検出することができる。
【0031】
そして、設定されている被圧延材の切断長から、溶接部3が冷却床7のどの位置にくるかを計算し、次に切断する被圧延材の先頭に溶接部3が位置すると判断されたときには、その被圧延材の切断長さを、溶接部3の試験用サンプルとして採取する試験材の長さ分だけ長くなるように制御する。
【0032】
上述のようにして切断するので、溶接部3は冷却床の端部に位置し、試験材が生産ラインを停止することなく、容易に採取できるとともに、試験材を採取した後の被圧延材の長さは、設定されている長さと同等になるので、試験材採取にともなって端尺が発生せず、製品歩留が低下することもない。
【0033】
また、制御装置9で計算された溶接部3の位置は、図3に示すように、表示装置11により、冷却床7に搬入された切断材12の順番にしたがって表示される。この表示により、溶接部3が分割切断されたどの被圧延材のどの位置にあるかが分かるので、溶接部3がうまく冷却床7の端部に位置しない場合でも、生産ラインを長時間停止することなく、また製品歩留を大きく低下させることなく、溶接部の試験用サンプルを採取することができる。
【0034】
なお、図において切断材12Aは、溶接部3が先頭に位置しているものを表し、この切断材14Aの長さは、溶接部3からサンプルを採取する分だけ長くなっている。
【0035】
溶接部3のトラッキング方法は、本発明の実施の形態の説明において説明した方法に限定されることはなく、既存の他のトラッキング方法を採用してもよい。
【0036】
【発明の効果】
この発明により、試験用サンプル採取のために、生産ラインを停止させることがないとともに、試験用サンプル採取にともなって製品歩留が大きく低下させることもない上に、試験用サンプル採取場所を一定の場所にすることができ、作業が簡素化できる。
【図面の簡単な説明】
【図1】本発明のビレット溶接部の試験用サンプルの採取方法において、ビレットの溶接部をトラッキングする方法を示す図である。
【図2】溶接部前後の温度変化のグラフである。
【図3】本発明において、溶接部を表示させる方法を示す図である。
【符号の説明】
1、2ビレット
3溶接部
4 溶接機
5 連続圧延スタンド
6 分割シャ−
7 冷却床
8 表面温度監視用温度計
9 制御装置
10 切断長設定器
11 表示装置
12、12A 切断材
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for collecting a test sample of a welded portion from a material to be rolled such as a bar, a wire, or a shape steel rolled from billets which are continuously travel-welded and fed to a row of rolling stands.
[0002]
[Prior art]
In the conventional continuous rolling method for energy saving and high efficiency production of wire rods, steel bars, shaped steels, etc., billets are extracted one by one from a heating furnace, and the rear end of the billet preceding by a flash butt welding machine. And the tip of the subsequent billet were welded, then burrs at the weld were removed with a scarfer or the like, and the continuous billet was heated to the temperature required for rolling by an induction heating device, and then passed through a rolling mill row. Some are continuously rolled.
[0003]
There is also a continuous rolling method in which a billet once extracted from a heating furnace is welded, connected to be continuous, and then heated again in the same heating furnace.
[0004]
The welded portion of the billet in such continuous rolling exists in any of the rolled materials cut into predetermined lengths by the dividing shears after rolling, and in a state where the longitudinal position thereof is changed variously.
[0005]
Since the welded portion present in the material to be rolled may contain impurities such as spatter at the time of welding, the material may be inferior to portions other than the welded portion. It is necessary to take a test sample from the weld and conduct a material test.
[0006]
Conventionally, as a method for collecting such a test sample from a material to be rolled, a method of tracking a welded portion has not been established. The position of the material to be rolled is tracked from the approximate total pressure extension of the material to be rolled, and further, it is determined by judging from the difference in color and color change on the surface of the material to be rolled and sampling. Was.
[0007]
Further, as another method, there is a method of performing rolling only for taking a sample of a welded portion and collecting a sample from the material to be rolled.
[0008]
In recent years, various methods of tracking a weld in continuous rolling have been proposed (for example, see Patent Document 1).
[0009]
[Patent Document 1]
JP-A-10-34212
[0010]
[Problems to be solved by the invention]
The above-described conventional method for collecting a test sample of a weld in continuous rolling has the following problems.
[0011]
In each case, the rolling must be interrupted, and it takes time to determine the position of the weld where the test sample is collected. , Productivity is impaired.
[0012]
Further, when the position of the welded portion for collecting the test sample is located in the middle portion of the cut material to be rolled, a scale is generated due to the collection of the test sample, and there is a portion that has to be scrapped. Therefore, the product yield decreases.
[0013]
The present invention has been made in order to solve the above-described problems of the prior art, and a test sample of a welded portion can be obtained without interrupting continuous rolling, and the product yield does not decrease. It is an object of the present invention to provide a method for collecting a test sample of a billet weld.
[0014]
[Means for Solving the Problems]
According to the first method for collecting a test sample of a billet welded portion according to the present invention, the welded portion of the billet which is continuously run and welded and sent to a row of rolling stands is formed by a method in which a rolled material to be rolled is divided by a shear. Tracked until it is divided and cut and cooled on the cooling floor, and when it is determined that the welded part is located at the top in the transport direction of the material to be divided and cut, the cut length of the material to be rolled is sampled as a test sample. The length of the test material to be cut is controlled to be longer.
[0015]
The first method for collecting a test sample of a billet weld according to the present invention utilizes the fact that the welding position of the billet is elongation of the material to be rolled and that there is a temperature change between the weld and the base material. The welding position from the rolling line to the split cutting line and the cooling floor is recognized by the controller.
[0016]
Then, based on the cut length of the split shear determined from the product length and the length of the cooling floor, and the tracking of the welded portion, the point where the welded portion comes to the end of the cooling floor is calculated, and the welded portion is formed on the cooling floor. When it is determined that the welded portion is located at the leading end in the transport direction of the material to be rolled which is divided and cut, in other words, the cut length of the material to be rolled when cut by the split shear is sampled. Even if the length of the test material is increased by the length of the test material and the test material is collected, when the material to be rolled is divided into the final product length after the test material is collected, no end scale is generated.
[0017]
Therefore, the production line is not stopped for the sampling of the test sample, the product yield is not significantly reduced by the sampling of the test sample, and the sampling location of the test sample is fixed. Work can be simplified.
[0018]
Further, in the second method for collecting a test sample of a billet welded part according to the present invention, the billet welded part which is continuously run and welded and sent to a row of rolling stands is formed by a method in which a material to be rolled is divided into two parts. -Tracking until it is divided and cut by the cooling floor and cooling is performed on the cooling floor, and from the tracking result, a screen is displayed to indicate which part of the material to be rolled has a welded portion among the plurality of materials to be rolled which are divided and cut. The test sample of the welded portion is collected based on the screen displayed.
[0019]
In the method for collecting a test sample of the second billet weld according to the present invention, by combining the method of tracking the temperature change portion and the method of tracking by pressure extension from the start of rolling, To accurately track the position.
[0020]
Therefore, even if the weld does not reach the end of the cooling floor, it is possible to display the position of the material to be rolled on the cooling floor where the weld is located and the position of the weld in the longitudinal direction of the material to be rolled. At any time, so that the operator can identify the site and take a sample at any time.
[0021]
Therefore, in the case of this sampling method as well, the stoppage of the production line can be minimized, and the reduction of the product yield can be suppressed.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a method of tracking a billet weld in a method for collecting a test sample of a billet weld according to the present invention.
[0023]
Adjacent billets 1 and 2 are welded while running by a welding machine 4. The welded portion 3 formed between the adjacent billets 1 and 2 is No. No. 1-STD (rolling stand is abbreviated as STD); 2-STD,... No. (N-1) -STD, No. It passes through the N-STD and the continuous rolling stand 5 and is rolled to a cross section of a predetermined product size.
[0024]
The rolled material to be rolled is divided and cut by the dividing shears 6 into a length that can be cooled by the cooling floor 7 (a plurality of lengths of the final product length).
[0025]
When the billet welding part 3 is being rolled, the billet is no. Conveying tape as it is transported to the 1-STD - rpm rv 0 Bull, of the rolling stand b - Le rpm rv 1, rv 2, ...... rv (N-1), rv N and final rolling stand No . The surface temperature TN of the material to be rolled measured by the surface temperature monitoring thermometer 8 installed on the outlet side of the N-STD is sent to the control device 9.
[0026]
In the control device 9, the cutting length when the material to be rolled is divided and cut by the dividing shears 6 is set in advance by the cutting length setting device 10, and the cut length set in accordance with a command from the control device 9 is set. Thus, the split shear 6 is operated.
[0027]
Further, the control device 9 performs tracking on the rolling line of the welding portion 3 based on the above-described roll rotation speed and roll diameter of each rolling stand, and also measures the temperature measured by the surface temperature monitoring thermometer 8. Based on the change, an accurate welding point can be grasped.
[0028]
FIG. 2 is a graph of the temperature change before and after the weld, showing that the weld 3 can be grasped based on the temperature change in the longitudinal direction of the material to be rolled. In Figure, a point and the point c that temperature than the temperature T of the other portions is reduced by [Delta] T 1, b point is the point where the temperature than the other portions is increased by [Delta] T 2.
[0029]
The reason why the surface temperature decreases at points a and c is that the power supply jaw grips the adjacent billet during welding, and the temperature rises at point b is due to upset welding. It is.
[0030]
Such a temperature change before and after the billet weld 3 always appears in the same pattern, and the position of the weld can be easily detected by such a pattern.
[0031]
Then, from the set cutting length of the material to be rolled, the position of the welded portion 3 on the cooling floor 7 is calculated, and it is determined that the welded portion 3 is located at the head of the material to be cut next. In some cases, the cut length of the material to be rolled is controlled so as to be longer by the length of the test material sampled as a test sample of the welded portion 3.
[0032]
Since cutting is performed as described above, the welded portion 3 is located at the end of the cooling floor, so that the test material can be easily collected without stopping the production line, and the material to be rolled after the test material is collected. Since the length is equal to the set length, no scale is generated with the sampling of the test material, and the product yield does not decrease.
[0033]
Further, as shown in FIG. 3, the position of the welded portion 3 calculated by the control device 9 is displayed on the display device 11 in accordance with the order of the cut materials 12 carried into the cooling floor 7. By this display, it is possible to know which position of the material to be rolled which the welded portion 3 is divided and cut. Therefore, even when the welded portion 3 is not located at the end of the cooling floor 7, the production line is stopped for a long time. A test sample of a welded portion can be obtained without causing a significant decrease in product yield.
[0034]
In the drawing, the cut material 12A represents the one in which the welded portion 3 is located at the top, and the length of the cut material 14A is longer by the amount of taking the sample from the welded portion 3.
[0035]
The tracking method of the welding portion 3 is not limited to the method described in the description of the embodiment of the present invention, and another existing tracking method may be adopted.
[0036]
【The invention's effect】
According to the present invention, the production line is not stopped for the sampling of the test sample, the product yield is not greatly reduced due to the sampling of the test sample, and the sampling location of the test sample is fixed. It can be a place and work can be simplified.
[Brief description of the drawings]
FIG. 1 is a diagram showing a method for tracking a billet weld in a method for collecting a test sample of a billet weld according to the present invention.
FIG. 2 is a graph of a temperature change before and after a weld.
FIG. 3 is a view showing a method of displaying a welded portion in the present invention.
[Explanation of symbols]
1, 2 billet 3 weld 4 welding machine 5 continuous rolling stand 6 split shear
7 Cooling floor 8 Surface temperature monitoring thermometer 9 Control device 10 Cutting length setting device 11 Display device 12, 12A Cutting material

Claims (2)

連続的に走間溶接されて圧延スタンド列に送り込まれるビレットの溶接部を、圧延された被圧延材が分割シャ−で分割切断され、冷却床で冷却されるまでトラッキングし、分割切断される被圧延材の搬送方向先頭に溶接部が位置すると判断されたときには、その被圧延材の切断長さを試験用サンプルとして採取する試験材の長さ分だけ長く切断するように制御することを特徴とするビレット溶接部の試験用サンプルの採取方法。The welded portion of the billet, which is continuously welded during running and sent to the rolling stand row, is tracked until the rolled material is divided and cut by the dividing shears and cooled on the cooling floor, and the material to be divided and cut is tracked. When it is determined that the welded portion is located at the head in the transport direction of the rolled material, the cut length of the material to be rolled is controlled so as to be cut by as much as the length of the test material to be collected as a test sample. To collect test samples for billet welds. 連続的に走間溶接されて圧延スタンド列に送り込まれるビレットの溶接部を、圧延された被圧延材が分割シャ−で分割切断され、冷却床で冷却されるまでトラッキングし、トラッキング結果から分割切断される複数の被圧延材のうちのどの被圧延材のどの部位に溶接部があるかを画面表示し、表示された画面に基づいて溶接部の試験用サンプルを採取することを特徴とするビレット溶接部の試験用サンプルの採取方法。The welded portion of the billet that is continuously welded during running and sent to the rolling stand row is tracked until the rolled material is split and cut by the split shear and cooled by the cooling floor, and split and cut from the tracking result. A billet characterized by displaying a screen on which part of the material to be rolled out of the plurality of materials to be rolled, and taking a test sample of the welded part based on the displayed screen. How to collect test samples for welds.
JP2003030045A 2003-02-06 2003-02-06 How to collect samples for testing billet welds Expired - Lifetime JP4199554B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108593332A (en) * 2018-06-29 2018-09-28 机械科学研究总院海西(福建)分院有限公司 Automatic sampling machine people, bar automatic sampling equipment and sampling method comprising it
CN113492154A (en) * 2020-03-20 2021-10-12 宝山钢铁股份有限公司 Hot rolling flying shear shearing control method based on multi-speed detection compensation
CN113865911A (en) * 2021-09-09 2021-12-31 柳州钢铁股份有限公司 Automatic control method for bar cold bed and hot card sampling
CN116651928A (en) * 2023-07-06 2023-08-29 山东钢铁集团永锋临港有限公司 A control method for billet fixed weight calculation based on bar non-cut length

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108593332A (en) * 2018-06-29 2018-09-28 机械科学研究总院海西(福建)分院有限公司 Automatic sampling machine people, bar automatic sampling equipment and sampling method comprising it
CN113492154A (en) * 2020-03-20 2021-10-12 宝山钢铁股份有限公司 Hot rolling flying shear shearing control method based on multi-speed detection compensation
CN113865911A (en) * 2021-09-09 2021-12-31 柳州钢铁股份有限公司 Automatic control method for bar cold bed and hot card sampling
CN113865911B (en) * 2021-09-09 2024-02-20 柳州钢铁股份有限公司 Automatic control method for bar cooling bed hot card sampling
CN116651928A (en) * 2023-07-06 2023-08-29 山东钢铁集团永锋临港有限公司 A control method for billet fixed weight calculation based on bar non-cut length

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