WO2010029624A1 - 冷間タンデム圧延機の圧延速度制御方法 - Google Patents
冷間タンデム圧延機の圧延速度制御方法 Download PDFInfo
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- WO2010029624A1 WO2010029624A1 PCT/JP2008/066420 JP2008066420W WO2010029624A1 WO 2010029624 A1 WO2010029624 A1 WO 2010029624A1 JP 2008066420 W JP2008066420 W JP 2008066420W WO 2010029624 A1 WO2010029624 A1 WO 2010029624A1
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- 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
- B21B37/46—Roll speed or drive motor control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
Definitions
- the present invention relates to a rolling speed control method of a cold tandem rolling mill that rolls a rolled material such as metal.
- the rolling mill control device is usually composed of a host computer such as a vidicon.
- This control apparatus receives rolling material information and product information, performs setting calculation so that a desired product can be obtained from the rolling material, and performs initial settings such as a pass schedule. And after a rolling material approachs a rolling mill, the plate
- the feasible rolling speed is calculated in consideration of the performance of each stand such as the motor capacity. Then, after the rolling of the rolled material is started, if there is no particular factor that hinders rolling, the rolling is performed up to the rolling speed calculated by the setting calculation.
- a slip sheet when winding a rolled material whose surface quality is important, such as stainless steel, a slip sheet may be inserted so that the surface is not damaged by winding the coil.
- This slip-sheet generates burn-in when the temperature exceeds a certain temperature. Due to this burn-in, the interleaf paper adheres to the coil or becomes brittle. If this phenomenon occurs, it causes trouble when rewinding in the next process. In the worst case, the slip sheet may ignite.
- Patent Document 1 is mainly intended to prevent heat scratches. For this reason, no consideration is given to the temperature of the rolled material after the rolling mill.
- patent document 2 considers the sticking temperature of an interleaf as a rolling material temperature after a rolling mill, dynamic control is implemented based on the measured value by a thermometer. However, in dynamic control, unless the rolling speed is actually increased, the temperature of the rolled material will not be known. For this reason, for example, there is a case where a delay occurs in the control due to a transfer time delay or the like such as when acceleration is performed at once, and the temperature of the rolled material exceeds the upper limit.
- the present invention has been made to solve the above-described problems, and its object is to provide a cooling device that can reliably prevent the temperature of the rolled material taken up by the winder after rolling from exceeding the upper limit. It is to provide a rolling speed control method for an intermediate tandem rolling mill.
- a rolling speed control method for a cold rolling mill includes a step of determining a temporary rolling speed of a cold tandem rolling mill in which a plurality of stands are arranged in tandem, and rolling when the rolling is performed at the temporary rolling speed. Based on the temperature model generated for each stand using the rolling speed of each stand and the temperature of the rolled material on the entry side of each stand as variables, the predicted temperature of the material is sequentially determined from the temperature model of the most upstream stand.
- the step of calculating and calculating the temporary predicted temperature of the rolled material when wound by the winder the step of comparing the temporary predicted temperature with a preset comparison value, and the temporary predicted temperature If higher than the comparison value, calculate a corrected rolling speed that has been corrected to reduce the temporary rolling speed so that the predicted temperature of the rolled material calculated based on the temperature model is lower than the comparison value, Modified rolling speed In those with a step of rolling the rolling material by operating the tandem cold rolling mill.
- FIG. 1 is an overall configuration diagram illustrating a cold tandem rolling mill in which a rolling speed control method for a cold tandem rolling mill according to Embodiment 1 of the present invention is used.
- 1 is a batch type cold tandem rolling mill.
- the cold tandem rolling mill 1 has a function of rolling the rolled material 7 in the rolling direction 6 indicated by an arrow.
- a rewinding machine (not shown) is provided on the entry side of the cold tandem rolling mill 1.
- the rewinding machine has a function of rewinding the coiled rolled material 7 and feeding it to the cold tandem rolling mill 1.
- the cold tandem rolling mill 1 is a continuous type
- a welding machine and a looper are installed between the unwinding machine and the cold tandem rolling mill 1.
- the continuous rolled material 7 enters the cold tandem rolling mill 1 and is rolled.
- a winder 8 is provided on the exit side of the cold tandem rolling mill 1.
- the winder 8 has a function of winding the rolled material 7 rolled by the cold tandem rolling mill 1 into a coil shape.
- a slip sheet (not shown) is inserted between the rolled materials 7 wound up by the winder 8. Thereby, the quality of the surface of the rolling material 7 is maintained.
- a thermometer 9 is disposed in the vicinity of the rolled material 7 between the cold tandem rolling mill 1 and the winder 8. Usually, since it is not installed in the cold tandem rolling line, the thermometer 9 is a portable type.
- the thermometer 9 has a function of measuring the actual temperature of the rolled material 7 rolled by the cold tandem rolling mill 1.
- the rolled material 7 is made of stainless steel having a glossy surface, in order to accurately measure the temperature of the rolled material 7, sufficient attention should be paid to appropriate adjustment of the emissivity of the rolled material 7, measurement environment, and the like. There is a need.
- the stands 2 to 5, the rewinder, the winder 8, and the thermometer 9 are connected to the control device 10.
- the control device 10 has a function of controlling the entire cold tandem rolling mill 1 such as the rolling speed of the stands 2 to 5 and the winding speed of the winder 8.
- the control device 10 has a function of determining the rolling speed of each of the stands 2 to 5 based on the speed cone and the motor capacity of each of the stands 2 to 5.
- the speed cone is the maximum rolling speed of each of the stands 2 to 5 determined from the motor rating (top speed), gear ratio, and roll diameter.
- the rolled material 7 is rolled and stretched from the upstream side to the downstream side of the cold tandem rolling mill 1. That is, it is necessary to make the plate thickness of the rolled material 7 on the downstream side thinner than the plate thickness of the rolled material 7 on the upstream side. Therefore, in order to satisfy the mass flow constant law, it is necessary to slow down the speed cone of the upstream stand 1 and the like and to speed up the speed cone of the downstream stand 4 and the like. Also, each stand 2-5 cannot rotate beyond the speed cone. Therefore, it is necessary to set the rolling speed of each of the stands 2 to 5 below the speed cone.
- control device 10 has a function of calculating the predicted temperature of the rolled material 7 based on the temperature model generated for each of the stands 2 to 5.
- This temperature model is usually included in a setting calculation function for determining a pass schedule and the like.
- This temperature model uses variables related to the rolling speed of each stand 2 to 5 such as processing heat generation, friction heat generation, cooling due to contact with the rolling roll, etc., and considering cooling by coolant, air cooling, etc.
- the temperature of the rolled material 7 is predicted.
- Detailed mathematical formulas of the temperature model are clarified in, for example, “Theory and practice of sheet thickness rolling” (Japan Iron and Steel Institute). For this reason, in this Embodiment, description of detailed numerical formula etc. is abbreviate
- the control device 10 uses the rolling speed of each of the stands 2 to 5 obtained by the setting calculation function and the thickness of the rolled material 7 as variables, and the temperature of the first stand 2 arranged at the most upstream position.
- the model has a function of calculating the predicted temperature of the rolled material 7 in order from the model.
- the control apparatus 10 predicts the estimated temperature of the rolled material 7 on the outlet side of the fourth stand 5 arranged on the most downstream side, and further the rolling material 7 at the position where the rolled material 7 is wound up by the winder 8.
- a function to calculate the predicted temperature is provided. Note that the temperature model is complicatedly associated with other models. For this reason, in the setting calculation, the temperature model may be regenerated by repeated calculation.
- control device 10 has a function of comparing the temporary predicted temperature of the rolled material 7 with a preset comparison value. Further, the control device 10 has a function of operating the cold tandem rolling mill 1 at the temporary rolling speed when the temporary predicted temperature is lower than the comparison value. In addition, when the temporary predicted temperature is higher than the comparison value, the control device 10 corrects the temporary rolling speed at a reduced speed so that the predicted temperature of the rolled material 7 calculated based on the temperature model is lower than the comparative value. A function of calculating the corrected rolling speed and operating the cold tandem rolling mill 1 at the corrected rolling speed is provided. In the present embodiment, the comparison value is set to the burn-in temperature of the slip sheet.
- FIG. 2 is a flowchart for explaining a rolling speed control method for the cold tandem rolling mill according to Embodiment 1 of the present invention.
- step S1 the provisional rolling speed of the cold tandem rolling mill 1 is determined in consideration of the speed cones and motor capacities of the stands 2 to 5, and the process proceeds to step S2.
- step S ⁇ b> 2 the predicted temperature of the rolled material 7 is calculated sequentially from the most upstream first stand 2, and the temporary predicted temperature of the rolled material 7 at the position of the winder 8 is calculated.
- step S3 the comparison is made between the temporary predicted temperature and the slip-in temperature of the slip sheet. If the provisional predicted temperature is lower than the burn-in temperature of the slip sheet, the operation ends. With such control, the cold tandem rolling mill 1 operates at a temporary rolling speed.
- step S4 the temporary rolling speed of the cold tandem rolling mill 1 is corrected to be reduced. And it returns to step S2 and calculates the predicted temperature of the rolling material 7 from the cold tandem rolling mill 1 entrance side to the position of the winder 8 one by one based on the temperature model. This calculation is repeated, and the corrected rolling speed of the cold tandem rolling mill 1 is calculated and the operation ends when the predicted temperature of the rolled material 7 is equal to or lower than the seizure temperature of the slip sheet. With this control, the cold tandem rolling mill 1 operates at a corrected rolling speed that is a maximum rolling speed that is equal to or lower than the seizure temperature of the slip sheet.
- FIG. 3 is a flowchart for explaining a temperature model learning method used in the rolling speed control method of the cold tandem rolling mill according to Embodiment 1 of the present invention.
- the temperature model must be sufficiently adjusted when the cold tandem rolling mill 1 is started up. Therefore, when the cold tandem rolling mill 1 is started up, a thermometer 9 is prepared, the temperature of the rolled material is manually measured for each steel type and sheet thickness, and the temperature model is adjusted.
- a specific procedure for adjusting the temperature model will be described.
- tracking points are created on the rolled material 7 at a certain timing. This tracking point is tracked from the entry side of the cold tandem rolling mill 1 to the position of the thermometer 9. In step S11, each time the tracking point reaches a thickness gauge (not shown) provided corresponding to each of the stands 2 to 5, related actual rolling data is collected. Finally, the actual temperature for learning of the rolled material 7 is collected by the thermometer 9, and the process proceeds to step S12.
- step S12 the collected actual rolling data is used as a variable, and from the temperature model of the first stand 2 on the most upstream side, the predicted temperature of the rolled material 7 is calculated using the actual rolling data as a variable in order, and finally, The learning predicted temperature of the rolled material 7 at the position of the thermometer 9 is calculated.
- step S13 the actual learning temperature is compared with the predicted learning temperature. Here, if there is no error in the temperature model, the actual learning temperature matches the predicted learning temperature. However, in general, the temperature model includes an error. For this reason, the temperature model is learned to eliminate the error.
- step S14 the learning gain is set to a smaller value in accordance with the error between the actual learning temperature and the predicted learning temperature, and the process proceeds to step S15.
- step S15 the learning value of the temperature model is calculated based on the set gain, and the operation ends.
- step S16 the learning gain is set to a larger value in accordance with the error between the actual learning temperature and the predicted learning temperature, and the process proceeds to step S15.
- step S15 the learning value of the temperature model is calculated based on the set gain, and the operation ends.
- the temporary predicted temperature is determined as the upper limit rolling speed allowed by the cold tandem rolling mill 1. And when temporary prediction temperature is lower than a comparison value, the cold tandem rolling mill 1 is operated at the temporary rolling speed, and the rolling material 7 is rolled. For this reason, while preventing reliably the temperature of the rolling material 7 after rolling exceeding an upper limit, the rolling material 7 can be rolled by the maximum rolling speed which can be implemented. Furthermore, since the comparison value is set to the burn-in temperature of the slip sheet, the burn-in of the slip sheet can be surely prevented, and the work rate does not decrease even in the downstream process.
- the control device 10 learns the temperature model so as to reduce the error between the actual temperature of the rolled material 7 and the predicted temperature for learning. For this reason, it can prevent more reliably that the temperature of the rolling material 7 after rolling exceeds an upper limit. Specifically, when the actual learning temperature is lower than the predicted learning temperature, the control device 10 decreases the learning gain of the temperature model according to the difference between the actual learning temperature and the predicted learning temperature, When the actual learning temperature is higher than the predicted learning temperature, the learning gain of the temperature model is increased according to the difference between the actual learning temperature and the predicted learning temperature. For this reason, when the temperature model removes the predicted temperature higher, the stability of the learned value is emphasized, and when the temperature model removes the predicted temperature lower, the followability of the learned value can be improved. .
- the actual rolling data of the tracking point of the rolled material 7 is measured by a plate thickness meter provided corresponding to each stand 2-5. And learning temperature prediction temperature is computed by making these performance rolling data into a variable. For this reason, a more accurate temperature model can be learned.
- the temperature model can be learned online to improve the accuracy of the temperature model.
- the rolling speed control method of the cold tandem rolling mill 1 described in the first embodiment can cope with the change of the pass schedule of the cold rolling mill that cannot be handled by the operation know-how obtained through experience. Furthermore, it goes without saying that the rolling speed control method of the cold tandem rolling mill 1 described in Embodiment 1 can be applied to other cold rolling mills such as a single reverse cold mill.
- the rolling speed control method of the cold tandem rolling mill according to the present invention it is possible to reliably prevent the temperature of the rolled material wound around the winding machine after rolling from exceeding the upper limit.
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Abstract
Description
4 第3スタンド、 5 第4スタンド、 6 圧延方向、 7 圧延材、
8 巻き取り機、 9 温度計、 10 制御装置
図1はこの発明の実施の形態1における冷間タンデム圧延機の圧延速度制御方法が利用される冷間タンデム圧延機を説明する全体構成図である。
図1において、1はバッチ式の冷間タンデム圧延機である。この冷間タンデム圧延機1は、第1スタンド~第4スタンド2~5がタンデムに配置される。この冷間タンデム圧延機1は、矢印の圧延方向6に圧延材7を圧延する機能を備える。また、冷間タンデム圧延機1の入側には、巻き戻し機(図示せず)が設けられる。この巻き戻し機は、コイル状の圧延材7を巻き戻して、冷間タンデム圧延機1に送り込む機能を備える。さらに、冷間タンデム圧延機1が連続式の場合、巻き戻し機と冷間タンデム圧延機1との間に、溶接機やルーパ(ともに図示せず)が設置される。これにより、切れ目のない圧延材7が冷間タンデム圧延機1に進入して圧延される。
図2はこの発明の実施の形態1における冷間タンデム圧延機の圧延速度制御方法を説明するためのフローチャートである。
まず、ステップS1で、各スタンド2~5のスピードコーン及びモータ容量を考慮して、冷間タンデム圧延機1の仮圧延速度が決定され、ステップS2に進む。ステップS2では、最上流の第1スタンド2から、順々に、圧延材7の予測温度が演算され、巻き取り機8の位置での圧延材7の仮予測温度が演算される。次に、ステップS3に進み、仮予測温度と間紙の焼き付き温度と比較が比較される。そして、仮予測温度が間紙の焼き付き温度よりも低ければ、動作が終了する。かかる制御により、冷間タンデム圧延機1は、仮圧延速度で動作する。
図3はこの発明の実施の形態1における冷間タンデム圧延機の圧延速度制御方法で利用される温度モデルの学習方法を説明するためのフローチャートである。
温度モデルは、冷間タンデム圧延機1の立ち上げ時に、十分に調整されていなければならない。そこで、冷間タンデム圧延機1の立ち上げ時に、温度計9が準備され、鋼種、板厚毎に、圧延材の温度がマニュアルで測定され、温度モデルが調整される。以下、温度モデルの調整するための具体的手順を説明する。
Claims (6)
- 複数のスタンドがタンデムに配置された冷間タンデム圧延機の仮圧延速度を決定する工程と、
前記仮圧延速度で圧延されたときの圧延材の予測温度を、各スタンドの圧延速度と各スタンドの入側の圧延材温度とを変数として前記スタンド毎に生成された温度モデルに基づいて、最上流側のスタンドの温度モデルから、順々に、演算し、巻き取り機で巻き取られるときの前記圧延材の仮予測温度を演算する工程と、
前記仮予測温度と予め設定された比較値とを比較する工程と、
前記仮予測温度が前記比較値よりも高い場合は、前記温度モデルに基づいて演算される圧延材の予測温度が前記比較値よりも低くなるように、前記仮圧延速度を減速修正した修正圧延速度を演算し、前記修正圧延速度で前記冷間タンデム圧延機を動作させて前記圧延材を圧延する工程と、
を備えたことを特徴とする冷間タンデム圧延機の圧延速度制御方法。 - 前記仮圧延速度は、前記冷間タンデム圧延機が許容する上限の圧延速度に決定され、
前記仮予測温度が前記比較値よりも低い場合は、前記仮圧延速度で前記冷間タンデム圧延機を動作させて前記圧延材を圧延することを特徴とする請求項1記載の冷間タンデム圧延機の圧延速度制御方法。 - 前記比較値は、前記巻き取り機が前記圧延材を巻き取るときに前記圧延材の間に挿入される間紙の焼き付き温度に設定されたことを特徴とする請求項1又は請求項2に記載の冷間タンデム圧延機の圧延速度制御方法。
- 前記冷間タンデム圧延機を学習用圧延速度で動作させ、前記冷間タンデム圧延機と前記巻き取り機との間に設けられた温度計で前記圧延材の学習用実温度を計測する工程と、
前記温度モデルに基づいて、前記学習用圧延速度で圧延されて前記巻き取り機で巻き取られるときの前記圧延材の学習用予測温度を演算する工程と、
前記学習用実温度と前記学習用予測温度とを比較する工程と、
前記学習用実温度と前記学習用予測温度との誤差を減らすように、前記温度モデルを学習する工程と、
を備えたことを特徴とする請求項1~請求項3のいずれかに記載の冷間タンデム圧延機の圧延速度制御方法。 - 前記学習用実温度が前記学習用予測温度よりも低い場合は、前記学習用実温度と前記学習用予測温度との誤差に応じて、前記温度モデルの学習ゲインを小さくし、
前記学習用実温度が前記学習用予測温度よりも高い場合は、前記学習用実温度と前記学習用予測温度との誤差に応じて、前記温度モデルの学習ゲインを大きくすることを特徴とする請求項4記載の冷間タンデム圧延機の圧延速度制御方法。 - 前記冷間タンデム圧延機の入側で、前記圧延材にトラッキングポイントを作成し、
各スタンドに対応して設けられた板厚計で、前記トラッキングポイントの実績圧延データを収集し、
前記温度計で、前記トラッキングポイントの学習用実温度を計測し、
最上流側のスタンドの温度モデルから、順々に、前記実績圧延データを変数として前記学習用予測温度を演算することを特徴とする請求項4又は請求項5に記載の冷間タンデム圧延機の圧延速度制御方法。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2008/066420 WO2010029624A1 (ja) | 2008-09-11 | 2008-09-11 | 冷間タンデム圧延機の圧延速度制御方法 |
| CN200880129259.9A CN102026744B (zh) | 2008-09-11 | 2008-09-11 | 串列式冷轧机的轧制速度控制方法 |
| JP2010528562A JP5077437B2 (ja) | 2008-09-11 | 2008-09-11 | 冷間タンデム圧延機の圧延速度制御方法 |
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/JP2008/066420 WO2010029624A1 (ja) | 2008-09-11 | 2008-09-11 | 冷間タンデム圧延機の圧延速度制御方法 |
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| JP (1) | JP5077437B2 (ja) |
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| TWI915968B (zh) | 2024-04-03 | 2026-02-21 | 日商Tmeic股份有限公司 | 熱壓延生產線的輥道輥控制裝置 |
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| JP6045420B2 (ja) * | 2013-03-27 | 2016-12-14 | 株式会社日立製作所 | 熱間タンデム圧延ミル制御装置及び熱間タンデム圧延ミルの制御方法 |
| JP2015205331A (ja) * | 2014-04-23 | 2015-11-19 | 株式会社日立製作所 | 熱間圧延機の制御装置および制御方法 |
| CN105215057B (zh) * | 2014-06-27 | 2017-04-26 | 宝山钢铁股份有限公司 | 一种中厚板轧制及输送速度的控制方法 |
| CN112387791B (zh) * | 2020-12-03 | 2022-11-18 | 北京首钢自动化信息技术有限公司 | 冷轧带钢的轧制温度确定方法及确定系统 |
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| JPH06190421A (ja) * | 1992-12-22 | 1994-07-12 | Kawasaki Steel Corp | ステンレス鋼帯の冷間圧延方法 |
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| CN1121445A (zh) * | 1994-09-06 | 1996-05-01 | 冶金工业部钢铁研究总院 | 串列环孔周期式冷轧管机 |
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- 2008-09-11 JP JP2010528562A patent/JP5077437B2/ja active Active
- 2008-09-11 WO PCT/JP2008/066420 patent/WO2010029624A1/ja not_active Ceased
- 2008-09-11 CN CN200880129259.9A patent/CN102026744B/zh active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06190421A (ja) * | 1992-12-22 | 1994-07-12 | Kawasaki Steel Corp | ステンレス鋼帯の冷間圧延方法 |
| JPH09276915A (ja) * | 1996-04-17 | 1997-10-28 | Furukawa Electric Co Ltd:The | 連続圧延機におけるダイナミックセットアップ方法 |
| JP2006281300A (ja) * | 2005-04-04 | 2006-10-19 | Nippon Steel Corp | 冷却制御方法、装置、及びコンピュータプログラム |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI915968B (zh) | 2024-04-03 | 2026-02-21 | 日商Tmeic股份有限公司 | 熱壓延生產線的輥道輥控制裝置 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5077437B2 (ja) | 2012-11-21 |
| JPWO2010029624A1 (ja) | 2012-02-02 |
| CN102026744B (zh) | 2013-04-17 |
| CN102026744A (zh) | 2011-04-20 |
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