JP2007160316A - Method for controlling water cooling of rolled material - Google Patents

Method for controlling water cooling of rolled material Download PDF

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JP2007160316A
JP2007160316A JP2005356540A JP2005356540A JP2007160316A JP 2007160316 A JP2007160316 A JP 2007160316A JP 2005356540 A JP2005356540 A JP 2005356540A JP 2005356540 A JP2005356540 A JP 2005356540A JP 2007160316 A JP2007160316 A JP 2007160316A
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water cooling
rolling
rolled material
temperature
rolling mill
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JP4648176B2 (en
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Norio Nishigaito
徳生 西垣内
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Kobe Steel Ltd
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<P>PROBLEM TO BE SOLVED: To provide a method for controlling a water cooling operation, which method can accurately control the temperature in a finish rolling process by suppressing the effect of the remained cooling water and the recuperation time on the surface temperature of the rolled material when an interim water cooling operation is carried out for improving the quality of material in a hot rolling process for steel bars and wires. <P>SOLUTION: When the rolled material 11 is forcedly cooled in an interim water cooling zone 3 between an interim rolling mill train 1 and a finish rolling mill train 2 of a rolling apparatus for steel bars or wires, the temperature at the exit side of the top rolling mill 2a in the finish rolling mill train 2 is used as the temperature of the rolled material after the water cooling operation or the rolling load in the top rolling mill 2a is used to control the water cooling operation. As a result, the use of the temperature of the rolled material in an unstable state, in which the difference of temperature distribution is large in the cross section in the recuperation process after rolling, is unnecessary. Further, because the value measured at the early stage after the interim water cooling operation is used for the water cooling, the temperature at the exit side of the finish rolling mill train 2 can be furthermore accurately controlled to the target finish temperature. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、棒鋼、線材など条材の熱間連続圧延における圧延材の水冷制御方法に関する。   The present invention relates to a method for controlling water cooling of a rolled material in hot continuous rolling of strips such as steel bars and wire rods.

棒鋼および線材（バーインコイル）などの条材は、加熱炉で熱間圧延温度域に加熱された鋼片、または連続鋳造設備から直送された鋼片を、多段に圧延機を配置した粗圧延から仕上げ圧延に至る複数の圧延機列での熱間圧延により、順次断面積を小さくして所要の寸法・形状に製造される。近年では、圧延製品の材質や表面性状などの品質改善のため、圧延機列間に中間水冷帯を設置して圧延材を強制水冷し、従来よりも仕上げ温度を低温側に制御するなどの制御圧延が行なわれている。このような仕上げ温度制御では、通常、中間水冷帯出側での圧延材の目標温度を予め定め、この目標温度に出来るだけ近づけるように冷却水流量が制御される。前記目標温度は、一般には圧延材の表面温度である。   Strips such as steel bars and wire rods (burn-in coils) can be obtained from rough rolling in which rolling mills are arranged in multiple stages from steel slabs heated to a hot rolling temperature range in a heating furnace or directly from continuous casting equipment. By hot rolling in a plurality of rolling mill rows leading to finish rolling, the cross-sectional area is sequentially reduced to produce the required dimensions and shapes. In recent years, in order to improve the quality of rolled products, such as the quality of the surface and surface properties, an intermediate water cooling zone is installed between rolling mills to force the rolled material to water-cool and control the finishing temperature to a lower temperature than before. Rolling is taking place. In such finishing temperature control, normally, the target temperature of the rolled material on the intermediate water cooling zone outlet side is determined in advance, and the cooling water flow rate is controlled so as to be as close as possible to this target temperature. The target temperature is generally the surface temperature of the rolled material.

このような冷却水流量の制御方法としては、従来から、水冷帯出側で実測した圧延材の実績温度と予め決定した水冷帯出側での目標温度との偏差に基づいて冷却水流量を制御するフィードバック制御、水冷帯入側で実測した圧延材の温度と水冷帯入側での目標温度との偏差に基づいて冷却水流量を制御するフィ−ドフォワード制御、および次圧延材への冷却水流量のプリセットが行なわれている。例えば、特許文献１では、上流側に圧延機、下流側に水冷帯を備えた棒鋼類の圧延設備で、圧延機側には圧延速度検出器、水冷帯の入側および出側には圧延材の温度検出器をそれぞれ設け、圧延速度検出器からの圧延速度信号と当該棒鋼情報とに基づいて棒鋼の位置トラッキングを行い、棒鋼長手方向部位について入側温度検出器からの温度信号に基づいて温度トラッキングを行い、この温度に基づいて前記水冷帯の水量をフィ−ドフォワード制御し、このときの制御量（冷却水流量）を出側温度検出器からの温度信号に基づいて補正し、当該棒鋼の後端が水冷帯を通過時または通過後において、当該棒鋼についての制御水量、または直近の複数本の棒鋼についての制御水量の平均値を次棒鋼の制御水量としてプリセットする棒鋼類圧延設備における水冷制御方法が開示されている。
特開平９−２３９４２３号公報 As a control method for such a cooling water flow rate, conventionally, feedback for controlling the cooling water flow rate based on a deviation between the actual temperature of the rolled material actually measured on the water cooling zone outlet side and a predetermined target temperature on the water cooling zone outlet side has been proposed. Control, feedforward control for controlling the cooling water flow rate based on the deviation between the temperature of the rolled material actually measured on the inlet side of the water cooling zone and the target temperature on the inlet side of the water cooling zone, and the flow rate of cooling water to the next rolling material Presets are being made. For example, in Patent Document 1, a rolling mill for steel bars equipped with a rolling mill on the upstream side and a water cooling zone on the downstream side, a rolling speed detector on the rolling mill side, and a rolling material on the entry side and the exit side of the water cooling zone Each of the temperature detectors is provided, and the position of the steel bar is tracked based on the rolling speed signal from the rolling speed detector and the steel bar information, and the temperature based on the temperature signal from the inlet temperature detector is measured for the longitudinal direction of the steel bar. Tracking is performed, and the amount of water in the water cooling zone is feedforward controlled based on this temperature, and the control amount (cooling water flow rate) at this time is corrected based on the temperature signal from the outlet side temperature detector, Steel bar rolling equipment that presets the control water amount for the steel bar or the average value of the control water amount for the most recent steel bars as the control water amount for the next steel bar when the rear end passes through the water-cooled zone Definitive water cooling control method is disclosed.
JP-A-9-239423

しかし、従来から行なわれている水冷制御方法や、特許文献１に開示された水冷制御方法では、圧延材の温度は、その表面温度を検出したものである。水冷直後の圧延材表面には冷却水が残留しており、水冷による表面温度むらが発生するため、正確な温度測定が難しい。また、水冷帯出側では、通常の圧延過程での圧延材の温度分布とは異なり、水冷により、圧延材中心部の温度低下に比べて表層部の温度低下が大きいため、圧延材の表面温度と中心温度との差が大きく、水冷後の復熱過程で圧延材の温度を測定しても、断面内平均温度で代表される圧延材の適正温度を測定していることにはならない。水冷後の復熱過程での圧延材の表面温度は復熱時間の関数となるため、水冷帯での冷却水流量が同じでも、すなわち圧延材の温度降下量が同じでも、圧延速度が異なると圧延材が水冷帯出側から温度検出位置に達するまでの時間（復熱時間）が異なり、復熱過程で測定される圧延材表面温度が異なることになる。   However, in the conventional water cooling control method and the water cooling control method disclosed in Patent Document 1, the temperature of the rolled material is the surface temperature detected. Cooling water remains on the surface of the rolled material immediately after water cooling, and surface temperature unevenness due to water cooling occurs, making accurate temperature measurement difficult. In addition, unlike the temperature distribution of the rolled material in the normal rolling process on the water-cooled zone exit side, the temperature drop in the surface layer part is larger than the temperature drop in the center part of the rolled material due to water cooling. The difference from the center temperature is large, and even if the temperature of the rolled material is measured in the reheating process after water cooling, the appropriate temperature of the rolled material represented by the average temperature in the cross section is not measured. Since the surface temperature of the rolled material in the reheating process after water cooling is a function of the reheating time, even if the cooling water flow rate in the water cooling zone is the same, that is, the temperature drop amount of the rolled material is the same, the rolling speed is different. The time (recuperation time) until the rolled material reaches the temperature detection position from the water-cooled zone exit side is different, and the surface temperature of the rolled material measured in the reheating process is different.

図３は、前記圧延機列間に設置した中間水冷帯での水冷過程および水冷後の復熱過程での圧延材の表面温度（Ｔｓ）、中心温度（Ｔｃ）および断面内の平均温度（Ｔｍ）の推移を示したものである。この圧延材の温度推移は、水冷前後の圧延材の実測表面温度に基づいて温度解析により算出したものである。圧延材の表面温度（Ｔｓ）に着目すると、中間水冷帯出側（水冷終了時）ではＴｓ＝７４０℃であり、水冷後０．１秒経過時には、Ｔｓ＝７８１℃まで復熱し、水冷後０．２秒経過時には、Ｔｓ＝７９８℃まで復熱している。このように、復熱時間が０．１秒異なるだけでも、圧延材表面温度に１７℃の温度差が生じる。一方、圧延材の断面内平均温度（Ｔｍ）については、中間水冷帯入側（冷却開始時）ではＴｍ＝９７３℃、中間水冷帯出側（冷却終了時）ではＴｍ＝８９２℃で、水冷による温度降下量ΔＴｍ＝８１℃であり、水冷後の復熱過程では断面内平均温度（Ｔｍ）は殆んど降下していない。前記復熱時間、すなわち水冷後温度検出までの時間が０．１秒異なるだけで生じる１７℃の圧延材表面温度の差は、断面内平均温度（Ｔｍ）の降下量（ΔＴｍ）の８１℃に対して約２０％に相当し、測温誤差の許容範囲を超えた大きな温度差となっている。   FIG. 3 shows the surface temperature (Ts), center temperature (Tc), and average temperature (Tm) in the cross section in the water cooling process in the intermediate water cooling zone installed between the rolling mill rows and in the reheating process after water cooling. ). The temperature transition of the rolled material is calculated by temperature analysis based on the measured surface temperature of the rolled material before and after water cooling. Focusing on the surface temperature (Ts) of the rolled material, Ts = 740 ° C. at the intermediate water cooling zone outlet (at the end of water cooling), and when 0.1 second has elapsed after water cooling, the heat is reheated to Ts = 781 ° C. When 2 seconds have elapsed, the heat is recovered to Ts = 798 ° C. Thus, even if the recuperation time is different by 0.1 second, a temperature difference of 17 ° C. occurs in the surface temperature of the rolled material. On the other hand, the average temperature (Tm) in the cross section of the rolled material is Tm = 973 ° C. on the intermediate water cooling zone entry side (at the start of cooling), and Tm = 892 ° C. on the intermediate water cooling zone exit side (at the end of cooling). The amount of decrease ΔTm = 81 ° C., and the average temperature (Tm) in the cross section hardly decreases during the reheating process after water cooling. The difference in the surface temperature of the rolled material of 17 ° C., which occurs only when the recuperation time, that is, the time until the temperature is detected after water cooling is 0.1 seconds, is 81 ° C., which is the amount of decrease (ΔTm) of the average temperature in the cross section (Tm). On the other hand, it corresponds to about 20%, which is a large temperature difference exceeding the allowable range of temperature measurement error.

そこで、この発明の課題は、棒鋼や線材などの条材の熱間圧延過程で材質改善などを目的として圧延材を水冷する場合に、水冷後の冷却水の残留や復熱時間が圧延材の表面温度に及ぼす影響を最小限に抑制して、仕上げ圧延温度を精度よく制御できる水冷制御方法を提供することである。   Therefore, the problem of the present invention is that when the rolled material is water-cooled for the purpose of improving the material quality during the hot rolling process of strips such as steel bars and wire rods, the remaining cooling water and the recuperation time after the water cooling are An object of the present invention is to provide a water cooling control method capable of controlling the finish rolling temperature with high accuracy while minimizing the influence on the surface temperature.

前記の課題を解決するために、この発明では以下の構成を採用したのである。   In order to solve the above problems, the present invention employs the following configuration.

請求項１に係る圧延材の水冷制御方法は、連続して多段に配置された圧延機で複数の圧延機列が形成され、上流側と下流側の圧延機列間に、冷却水流量調整手段を備えた水冷制御手段を有する水冷装置を配置した棒鋼または線材圧延設備での圧延材の水冷制御方法であって、前記水冷制御手段により、前記水冷装置で水冷後、前記下流側の圧延機列の先頭の圧延機出側での圧延材表面温度が所定の温度となるように前記水冷装置への冷却水供給流量を制御することを特徴とする。   The method for controlling water cooling of a rolled material according to claim 1 is characterized in that a plurality of rolling mill rows are formed by rolling mills continuously arranged in multiple stages, and a cooling water flow rate adjusting means is provided between the upstream and downstream rolling mill rows. A method of controlling water cooling of a rolled material in a steel bar or wire rod rolling facility equipped with a water cooling device having a water cooling control means comprising: a downstream rolling mill row after water cooling by the water cooling device by the water cooling control means The flow rate of the cooling water supplied to the water cooling device is controlled so that the surface temperature of the rolled material on the outlet side of the first rolling mill becomes a predetermined temperature.

一般に、棒鋼または線材の圧延過程で材質改善などを目的として、仕上げ圧延温度を制御するために中間水冷などの強制水冷を行なう場合に、通常、水冷帯出側での圧延材の温度、すなわち圧延材表面温度が所定の温度となるように冷却水流量の調節などの水冷制御が行なわれる。しかし、前述のように、水冷帯出側直後の圧延材表面には、冷却水の残留や水冷過程で発生した温度むらが存在するため、圧延材の温度を正確に測定することは難しい。また、圧延材の表面温度を水冷帯出側の復熱過程で測定した場合には、圧延材の断面内平均温度と表面温度との差が大きく、圧延材表面温度は、圧延材断面内平均温度、すなわち圧延材の代表温度を表したものとは言えない。このため、復熱が完全に終了した時点の圧延材の表面温度を測定することが望ましいが、復熱が完全に終了するためには通常１秒程度の時間が必要であり、水冷帯と仕上げ圧延機列などの下流側の圧延機列との間に充分な距離が必要となる。この距離は、例えば、圧延速度が６ｍ／ｓであれば、６ｍ以上必要となり、圧延設備長さの制約から充分な距離を取れないことが多い。これに対し、圧延機で塑性変形を受けたロール孔型出側の圧延材は、メタルフローにより圧延材の表面性状が均一化してきて、塑性変形による加工発熱も圧延材中心部よりも表層部に多く発生するため、圧延材断面内の温度分布も均一化してくる。したがって、圧延後の表面温度は、復熱過程での表面温度に比べて、圧延材断面内平均温度、すなわち圧延材の代表温度により近づくため、仕上げ圧延機列などの前記下流側の圧延機列の先頭の圧延機出側の圧延材表面温度を測定し、この温度が目標温度と一致するように水冷帯の冷却水流量を調整することにより、仕上げ圧延温度等、圧延温度を精度よくコントロールできる高精度の水冷制御が可能となる。ここで、先頭の圧延機出側とは、この圧延機の出側から下流側の次圧延機の入側までの間を意味する。以下の記載においても同様である。   In general, when forced water cooling such as intermediate water cooling is performed to control the finishing rolling temperature for the purpose of improving the material quality in the rolling process of steel bars or wire rods, the temperature of the rolling material at the outlet side of the water cooling zone, that is, the rolling material is generally used. Water cooling control such as adjustment of the cooling water flow rate is performed so that the surface temperature becomes a predetermined temperature. However, as described above, the surface of the rolled material immediately after the exit from the water-cooled zone has residual cooling water and temperature unevenness generated during the water-cooling process, so it is difficult to accurately measure the temperature of the rolled material. In addition, when the surface temperature of the rolled material is measured during the reheating process on the water-cooled zone exit side, the difference between the average temperature in the cross section of the rolled material and the surface temperature is large, and the surface temperature of the rolled material is the average temperature in the cross section of the rolled material. That is, it cannot be said that it represents the representative temperature of the rolled material. For this reason, it is desirable to measure the surface temperature of the rolled material at the time when the recuperation is completed, but it usually takes about 1 second to complete the recuperation. A sufficient distance is required between the rolling mill row on the downstream side such as a rolling mill row. For example, if the rolling speed is 6 m / s, this distance is required to be 6 m or more. In many cases, a sufficient distance cannot be obtained due to restrictions on the length of the rolling equipment. In contrast, the rolled material on the exit side of the roll hole mold that has undergone plastic deformation in a rolling mill has a uniform surface property due to metal flow, and the heat generated by plastic deformation is also greater than the center of the rolled material. Therefore, the temperature distribution in the cross section of the rolled material becomes uniform. Therefore, since the surface temperature after rolling is closer to the average temperature in the cross section of the rolled material, that is, the representative temperature of the rolled material, compared to the surface temperature in the recuperation process, the downstream rolling mill row such as the finishing rolling mill row By measuring the surface temperature of the rolled material on the delivery side of the first rolling mill and adjusting the cooling water flow rate in the water cooling zone so that this temperature matches the target temperature, the rolling temperature such as the finish rolling temperature can be accurately controlled. High-precision water cooling control is possible. Here, the leading rolling mill outlet side means the interval from the outlet side of this rolling mill to the inlet side of the downstream next rolling mill. The same applies to the following description.

請求項２に係る圧延材の水冷制御方法は、連続して多段に配置された圧延機で複数の圧延機列が形成され、上流側と下流側の圧延機列間に、冷却水流量調整手段を備えた水冷制御手段を有する水冷装置を配置した棒鋼または線材圧延設備での圧延材の水冷制御方法であって、前記水冷制御手段により、前記水冷装置で圧延材を水冷後、前記下流側の圧延機列の先頭の圧延機出側での圧延材表面温度と予め設定した目標表面温度との偏差に基づき、次圧延材に対して前記水冷装置への冷却水供給流量および／または圧延速度の設定値を調整することを特徴とする。   The method for controlling water cooling of a rolled material according to claim 2 is characterized in that a plurality of rolling mill rows are formed by rolling mills arranged continuously in multiple stages, and a cooling water flow rate adjusting means is provided between the upstream and downstream rolling mill rows. A water cooling control method for a rolled material in a steel bar or wire rod rolling facility equipped with a water cooling device having a water cooling control means comprising a water cooling control means comprising: Based on the deviation between the surface temperature of the rolled material on the outlet side of the first rolling mill in the rolling mill row and the preset target surface temperature, the flow rate of the cooling water supplied to the water cooling device and / or the rolling speed of the next rolled material The setting value is adjusted.

このように、当該圧延材についての水冷制御結果に基づいて次圧延材の冷却水供給流量および／または圧延速度の設定値（プリセット流量およびプリセット圧延速度）を調整すれば、前記の圧延材１本内の冷却水流量の調整と相俟って、次圧延材の先端側から、圧延温度をさらに精度よくコントロールできる高精度の水冷制御が可能となる。   Thus, if the set value (preset flow rate and preset rolling speed) of the cooling water supply flow rate and / or rolling speed of the next rolled material is adjusted based on the water cooling control result for the rolled material, the one rolled material described above Combined with the adjustment of the flow rate of the cooling water inside, it is possible to perform highly accurate water cooling control that can control the rolling temperature with higher accuracy from the front end side of the next rolled material.

請求項３に係る圧延材の水冷制御方法は、連続して多段に配置された圧延機で複数の圧延機列が形成され、上流側と下流側の圧延機列間に、冷却水流量調整手段を備えた水冷制御手段を有する水冷装置を配置した棒鋼または線材圧延設備での圧延材の水冷制御方法であって、前記水冷制御手段により、前記水冷装置で圧延材を水冷後、前記下流側の圧延機列の先頭の圧延機での圧延負荷が所定の圧延負荷となるように前記水冷装置への冷却水供給流量を制御することを特徴とする。   The method for controlling water cooling of a rolled material according to claim 3 is characterized in that a plurality of rolling mill rows are formed by rolling mills continuously arranged in multiple stages, and a cooling water flow rate adjusting means is provided between the upstream and downstream rolling mill rows. A water cooling control method for a rolled material in a steel bar or wire rod rolling facility equipped with a water cooling device having a water cooling control means comprising a water cooling control means comprising: The cooling water supply flow rate to the water cooling device is controlled so that the rolling load at the rolling mill at the head of the rolling mill row becomes a predetermined rolling load.

圧延鋼種、圧延速度および断面減少率が同一であれば、圧延負荷は圧延材の断面内の平均温度に比例するため、一般に圧延荷重または圧延動力で表される圧延負荷と圧延材の断面内平均温度との関係を求めておけば、圧延負荷を測定することは圧延材の断面内平均温度を測定することと同等になる。したがって、仕上げ圧延機列の先頭の圧延機での圧延負荷を測定し、この圧延負荷が目標とする圧延負荷と一致するように、水冷帯の冷却水流量および／または圧延速度を調整することにより、仕上げ圧延温度等、圧延温度を精度よくコントロールできる高精度の水冷制御が可能となる。   If the rolling steel type, rolling speed and cross-section reduction rate are the same, the rolling load is proportional to the average temperature in the cross section of the rolled material, so the rolling load generally expressed in terms of rolling load or rolling power and the average in the cross section of the rolled material If the relationship with temperature is calculated | required, measuring a rolling load will become equivalent to measuring the average temperature in the cross section of a rolling material. Therefore, by measuring the rolling load at the first rolling mill in the finish rolling mill row, and adjusting the cooling water flow rate and / or rolling speed of the water cooling zone so that this rolling load matches the target rolling load. In addition, high-precision water cooling control capable of accurately controlling the rolling temperature such as the finish rolling temperature becomes possible.

請求項４に係る圧延材の水冷制御方法は、連続して多段に配置された圧延機で複数の圧延機列が形成され、上流側と下流側の圧延機列間に、冷却水流量調整手段を備えた水冷制御手段を有する水冷装置を配置した棒鋼または線材圧延設備での圧延材の水冷制御方法であって、前記水冷制御手段により、前記水冷装置で圧延材を水冷後、前記下流側の圧延機列の先頭の圧延機の圧延負荷と予め設定した目標圧延負荷との偏差に基づき、次圧延材に対して前記水冷装置への冷却水供給流量および／または圧延速度の設定値を調整することを特徴とする。   According to a fourth aspect of the present invention, there is provided a water cooling control method for a rolled material, in which a plurality of rolling mill rows are formed by rolling mills continuously arranged in multiple stages, and a cooling water flow rate adjusting means is provided between the upstream and downstream rolling mill rows. A water cooling control method for a rolled material in a steel bar or wire rod rolling facility equipped with a water cooling device having a water cooling control means comprising a water cooling control means comprising: Based on the deviation between the rolling load of the first rolling mill in the rolling mill row and the preset target rolling load, the set value of the cooling water supply flow rate and / or rolling speed to the water cooling device is adjusted for the next rolled material. It is characterized by that.

このように、当該圧延材についての水冷制御結果に基づいて次圧延材の冷却水供給流量および／または圧延速度の設定値（プリセット流量およびプリセット圧延速度）を調整すれば、制御パラメータとして、圧延材表面温度の代わりに圧延負荷を用いる場合にも、前記の圧延材１本内の冷却水流量の調整と相俟って、次圧延材の先端側から、圧延温度をさらに精度よくコントロールできる高精度の水冷制御が可能となる。   As described above, if the cooling water supply flow rate and / or the set value of the rolling speed (preset flow rate and preset rolling speed) of the next rolled material are adjusted based on the water cooling control result for the rolled material, the rolled material is used as a control parameter. Even when a rolling load is used instead of the surface temperature, it is possible to control the rolling temperature more accurately from the front end side of the next rolled material in combination with the adjustment of the cooling water flow rate in one rolled material. Water cooling control is possible.

この発明では、棒鋼または線材の圧延過程で、仕上げ温度制御等を目的として圧延機列間に設けた水冷帯で圧延材の強制水冷を行なう場合に、従来のように、正確な温度測定が難しい水冷帯出側での圧延材の表面温度に基づかず、水冷帯の下流側圧延機列の先頭圧延機出側での圧延材表面温度が所定の温度となるように、または前記先頭圧延機での圧延負荷が目標圧延負荷と一致するように、水冷帯への冷却水供給流量および／または圧延速度を制御するようにしたので、圧延材の代表温度（断面内平均温度）に基づいて、仕上げ圧延温度等、圧延温度を精度よくコントロールできる高精度の水冷制御を実現することができる。   In this invention, in the rolling process of steel bars or wire rods, when performing forced water cooling of the rolled material in a water cooling zone provided between the rolling mill rows for the purpose of controlling the finishing temperature, it is difficult to accurately measure the temperature as in the prior art. It is not based on the surface temperature of the rolled material on the water-cooled zone outlet side, so that the surface temperature of the rolled material on the outlet side of the leading rolling mill in the downstream rolling mill row of the water-cooled zone becomes a predetermined temperature, or in the leading rolling mill Since the cooling water supply flow rate and / or the rolling speed is controlled so that the rolling load coincides with the target rolling load, finish rolling is performed based on the representative temperature (average temperature in the cross section) of the rolled material. High-precision water cooling control that can accurately control the rolling temperature such as temperature can be realized.

以下に、この発明の実施形態を添付の図１から図３に基づいて説明する。   Embodiments of the present invention will be described below with reference to the accompanying FIGS.

図１は、棒鋼または線材圧延設備の要部を示したもので、連続して多段に配置された圧延機１ａ〜１ｆ、および圧延機列２ａ〜２ｆからそれぞれなる上流側の中間圧延機列１と下流側の仕上げ圧延機列２の間に中間水冷帯３が配置されている。この実施形態では、中間水冷帯３の入側には入側温度計（入側温度検出器）４が、中間水冷帯３の下流側の仕上げ圧延機列２の先頭の圧延機２ａの出側には出側温度計（出側温度検出器）５がそれぞれ設けられている。また、中間圧延機列１および仕上げ圧延機列２の各圧延機１ａ〜１ｆおよび２ａ〜２ｆには、圧延材の噛み込みを検出するメタルイン検出器６、７、および圧延速度を検出する線速検出器８、９がそれぞれ設けられている。図１では、メタルイン検出器６、７、および線速検出器８、９を中間圧延機列１の最下流側の圧延機１ｆと、仕上げ圧延機列２の最上流、すなわち先頭の圧延機２ａについてのみ記載し、他の圧延機については図示を省略している。前記の各検出器からの噛み込み信号、線速検出信号および温度検出信号はそれぞれ水冷制御装置１０に取り込まれる。    FIG. 1 shows an essential part of a steel bar or wire rod rolling facility, and an upstream intermediate rolling mill row 1 composed of rolling mills 1a to 1f and rolling mill rows 2a to 2f arranged in multiple stages continuously. An intermediate water cooling zone 3 is arranged between the finishing mill row 2 on the downstream side. In this embodiment, an inlet-side thermometer (an inlet-side temperature detector) 4 is provided on the inlet side of the intermediate water-cooling zone 3, and the outlet side of the leading rolling mill 2 a in the finish rolling mill row 2 on the downstream side of the intermediate water-cooling zone 3. Each is provided with an exit side thermometer (outside temperature detector) 5. Further, in each of the rolling mills 1a to 1f and 2a to 2f of the intermediate rolling mill row 1 and the finishing rolling mill row 2, metal-in detectors 6 and 7 for detecting the biting of the rolled material and lines for detecting the rolling speed are provided. Speed detectors 8 and 9 are provided, respectively. In FIG. 1, the metal-in detectors 6, 7 and the linear velocity detectors 8, 9 are arranged at the most downstream side of the rolling mill 1 f of the intermediate rolling mill row 1 and the most upstream, that is, the leading rolling mill of the finishing rolling mill row 2. Only 2a is described, and the other rolling mills are not shown. The biting signal, the linear velocity detection signal, and the temperature detection signal from each of the detectors are taken into the water cooling control device 10, respectively.

圧延材１１が中間圧延機列１に到達した時点から、水冷制御装置１０により、圧延材１１の詳細なトラッキングが行なわれる。圧延材１１が中間圧延機列１の最後尾の圧延機１ｆに到達したかどうかは、メタルイン検出器６により検出される。そして、予め決定されている当該圧延材のパススケジュールと、線速検出器８によって検出される圧延速度と、入側温度計（入側温度検出器）４による圧延材の温度計測値から、中間水冷帯３を通過するときの、圧延材の長手方向の部位と温度と圧延速度とが対応づけられ、これらの値がリンクされて水冷制御装置１０に取り込まれる。メタル検出器６により圧延材先端が中間圧延機列１の最後尾の圧延機１ｆに達したことが検出されると、水冷制御装置１０により、この検出時点から圧延材の先端が中間水冷帯に到達するまで時間が算出されて、この到達時間から、入側温度計４により、中間水冷帯３入側の圧延材長手方向の温度Ｔ１が、所定の時間間隔で計測される。そして、この温度計測値Ｔ１は、前記のように、圧延材の長手方向の部位と対応づけて水冷制御装置１０に取り込まれている。次に、メタル検出器７により、圧延材の先端が、仕上げ圧延機列２の先頭圧延機２ａに到達したことが検出されると、水冷制御装置１０からの指令で、先頭圧延機２ａの出側温度計５により、圧延材長手方向の温度Ｔ２が所定の時間間隔で、すなわち、中間水冷帯３の入側で温度計測された圧延材の長手方向の部位に対応する部位の温度Ｔ２が計測される。この検出温度Ｔ２と予め設定した先頭圧延機２ａ出側温度計５の位置での目標温度Ｔ２ａとの差ΔＴ２に応じて、すなわち、圧延材の温度Ｔ２が目標温度Ｔ２ａに一致するように、当該圧延材に対しては中間水冷帯３の冷却水流量をフィ−ドバック制御する。また、次圧延材に対しては、冷却水流量の設定量および／または圧延速度を制御する。   From the point of time when the rolled material 11 reaches the intermediate rolling mill row 1, the water cooling control device 10 performs detailed tracking of the rolled material 11. Whether or not the rolled material 11 has reached the last rolling mill 1f of the intermediate rolling mill row 1 is detected by the metal-in detector 6. And, from the predetermined pass schedule of the rolled material, the rolling speed detected by the linear velocity detector 8, and the temperature measurement value of the rolled material by the entry side thermometer (entrance side temperature detector) 4, an intermediate A portion in the longitudinal direction of the rolled material, the temperature, and the rolling speed when passing through the water cooling zone 3 are associated with each other, and these values are linked and taken into the water cooling control device 10. When it is detected by the metal detector 6 that the leading end of the rolled material has reached the last rolling mill 1f of the intermediate rolling mill row 1, the water cooling control device 10 changes the leading end of the rolled material to the intermediate water cooling zone from this detection time. Time is calculated until it reaches, and from this arrival time, the temperature T1 in the longitudinal direction of the rolled material on the entry side of the intermediate water cooling zone 3 is measured by the entry side thermometer 4 at predetermined time intervals. And this temperature measurement value T1 is matched with the site | part of the longitudinal direction of a rolling material, and it is taken in into the water cooling control apparatus 10 as mentioned above. Next, when it is detected by the metal detector 7 that the leading end of the rolled material has reached the leading rolling mill 2a of the finish rolling mill row 2, the command from the water cooling control device 10 outputs the leading rolling mill 2a. The temperature T2 in the longitudinal direction of the rolled material measured at the predetermined time interval, that is, the temperature T2 in the longitudinal direction of the rolled material is measured by the side thermometer 5 at a predetermined time interval. Is done. In accordance with the difference ΔT2 between the detected temperature T2 and the target temperature T2a at the position of the leading rolling mill 2a outlet thermometer 5 set in advance, that is, the temperature T2 of the rolled material is matched with the target temperature T2a. Feedback control is performed on the flow rate of the cooling water in the intermediate water cooling zone 3 for the rolled material. For the next rolled material, the set amount of the cooling water flow rate and / or the rolling speed is controlled.

前記当該圧延材に対する冷却水流量の制御は、目標温度Ｔ２ａからの差ΔＴ２に対して、水冷帯の冷却水流量Ｗａを温度偏差ΔＴ２の解消に必要な冷却水流量ΔＷａだけ補正する。なお、前記目標温度Ｔ２ａとの温度偏差を比較する先頭圧延機２ａ出側での計測温度Ｔ２は、温度計測のバラツキを考慮して、圧延材長手方向の複数の計測温度を平均した平均値（Ｔ２ａｖ．）である。したがって、ΔＴ２＝ABS(Ｔ２ａ−Ｔ２)＝ABS(Ｔ２ａ−Ｔ２ａｖ．)である。ABSは絶対値を表わす記号である。同様に、中間水冷帯３入側の圧延材長手方向の温度Ｔ１として、圧延材長手方向の複数の計測温度の平均値（Ｔ１ａｖ．）が用いられる。この先頭圧延機２ａの出側および中間水冷帯３の入側の計測温度の平均化は、圧延材の長手方向に沿って、温度計測部位グループについて繰り返される。そして、中間水冷帯３の入側の平均温度Ｔ１ａｖ.、前記先頭圧延機２ａの出側の平均温度Ｔ２ａｖ、温度降下量（Ｔ１ａｖ．−Ｔ２ａｖ）、先頭圧延機２ａの出側の目標温度Ｔ２ａからの温度偏差ΔＴ２、前記平均温度を算出した計測部位が中間水冷帯３を通過したときの冷却水流量Ｗａ（平均流量）、前記温度偏差ΔＴ２に基づく補正流量ΔＷａ（平均流量）、および当該圧延材に対する中間水冷帯３入側の目標温度Ｔ１ａ、目標温度降下量（Ｔ１ａ−Ｔ２ａ）、圧延速度、当該圧延材の製品寸法（仕上げ線径）、鋼種がそれぞれ水冷制御装置１０の記憶部（図示省略）に記憶される。そして、同一ロットの次圧延材を含めて、同一鋼種または同一鋼種グループ、同一製品寸法の圧延材に対して、記憶した水冷制御結果に基づいて、中間水冷帯３の初期設定流量Ｗｐおよび目標温度Ｔ２ａからの偏差１℃あたりの補正流量ΔＷｕを修正して水冷制御精度を向上させる。なお、前記冷却水の初期設定流量Ｗｐは、中間水冷帯３での目標温度降下量（Ｔ１ａ−Ｔ２ａ）に対して、鋼種、製品寸法、圧延速度等の圧延条件に対して、水冷制御実績値等から予め求めておいた冷却水流量に基づいて決定することができる。また、目標温度Ｔ２ａからの偏差１℃あたりの補正流量ΔＷｕは、当該圧延材に対する補正流量ΔＷａの平均値ΔＷａｍと、目標温度Ｔ２ａと当該圧延材についてのＴ２の平均温度Ｔ２ｍとの偏差に基づいて算出することが可能である。   In the control of the cooling water flow rate for the rolled material, the cooling water flow rate Wa in the water cooling zone is corrected by the cooling water flow rate ΔWa necessary for eliminating the temperature deviation ΔT2 with respect to the difference ΔT2 from the target temperature T2a. The measured temperature T2 on the outlet side of the leading rolling mill 2a that compares the temperature deviation with the target temperature T2a is an average value obtained by averaging a plurality of measured temperatures in the longitudinal direction of the rolled material in consideration of variations in temperature measurement ( T2av.). Therefore, ΔT2 = ABS (T2a−T2) = ABS (T2a−T2av.). ABS is a symbol representing an absolute value. Similarly, an average value (T1av.) Of a plurality of measured temperatures in the longitudinal direction of the rolled material is used as the temperature T1 in the longitudinal direction of the rolled material on the intermediate water cooling zone 3 entrance side. The averaging of the measured temperatures on the outlet side of the leading rolling mill 2a and the inlet side of the intermediate water cooling zone 3 is repeated for the temperature measurement region group along the longitudinal direction of the rolled material. And from the average temperature T1av on the entry side of the intermediate water cooling zone 3, the average temperature T2av on the exit side of the leading rolling mill 2a, the temperature drop (T1av.-T2av), and the target temperature T2a on the exit side of the leading rolling mill 2a Temperature deviation ΔT 2, cooling water flow rate Wa (average flow rate) when the measurement part where the average temperature is calculated passes through the intermediate water cooling zone 3, correction flow rate ΔWa (average flow rate) based on the temperature deviation ΔT 2, and the rolling material The target temperature T1a, the target temperature drop amount (T1a-T2a), the rolling speed, the product size (finished wire diameter) of the rolled material, and the steel type of the intermediate water cooling zone 3 with respect to the storage section (not shown) ). And, including the next rolled material of the same lot, the initial set flow rate Wp and the target temperature of the intermediate water cooling zone 3 based on the stored water cooling control results for the rolled material of the same steel type or the same steel type group and the same product size. The correction flow rate ΔWu per 1 ° C. deviation from T2a is corrected to improve the water cooling control accuracy. The initial set flow rate Wp of the cooling water is a water cooling control performance value for rolling conditions such as steel grade, product dimensions, rolling speed, etc. with respect to the target temperature drop (T1a-T2a) in the intermediate water cooling zone 3. It can be determined based on the cooling water flow rate obtained in advance from the above. Further, the corrected flow rate ΔWu per 1 ° C. from the target temperature T2a is based on the deviation between the average value ΔWam of the corrected flow rate ΔWa for the rolled material and the average temperature T2m of T2 for the rolled material and the target temperature T2a. It is possible to calculate.

前記圧延材の温度は、通常、加熱炉での加熱状態等に起因して、１本の圧延材内で、その先後端部や中間部の全長にわたって変動し、圧延材間でも変動する。このため、目標温度からの偏差に基づいた、水冷制御装置１０からの制御指令により、的確かつタイムリーに冷却水流量の調節弁を作動させるためには、流量調節弁の動作は遅れを伴うことを考慮して、目標温度Ｔ２ａからの温度偏差ΔＴ２に対する冷却水の補正流量ΔＷａを、次圧延材に対して早い目のタイミングで、すなわち、次圧延材の先端部が中間水冷帯３に到達する時点では、前記流量調節弁の開度が前記補正流量ΔＷａを取り込んだ初期設定流量（＝Ｗｐ＋ΔＷｐ（＝ΔＷａ））の弁開度となるように弁開度の動作指示を与えることが望ましい。   The temperature of the rolled material usually varies over the entire length of the front and rear end portions and the intermediate portion in one rolled material due to the heating state in the heating furnace and the like, and also varies between the rolled materials. For this reason, in order to operate the cooling water flow rate adjusting valve accurately and in a timely manner by the control command from the water cooling control device 10 based on the deviation from the target temperature, the operation of the flow rate adjusting valve is delayed. In consideration of the above, the correction flow rate ΔWa of the cooling water with respect to the temperature deviation ΔT2 from the target temperature T2a is set at an early timing relative to the next rolling material, that is, the leading end of the next rolling material reaches the intermediate water cooling zone 3. At the time, it is desirable to give an operation instruction of the valve opening degree so that the opening degree of the flow rate control valve becomes the valve opening degree of the initial setting flow rate (= Wp + ΔWp (= ΔWa)) incorporating the correction flow rate ΔWa.

図２は、図１の場合と同様に、棒鋼または線材圧延設備の要部を示したもので、この実施形態では、中間水冷帯３の下流側の仕上げ圧延機列２の先頭圧延機２ａの出側に温度計５を設ける（図１参照）代わりに、先頭圧延機２ａに、圧延負荷検出器１２として圧延荷重の検出器が付設されており、それ以外の設備構成は図１の場合と同様であるので、説明を省略する。   FIG. 2 shows the main part of the steel bar or wire rod rolling facility as in the case of FIG. 1. In this embodiment, the first rolling mill 2a of the finishing rolling mill row 2 downstream of the intermediate water cooling zone 3 is shown in FIG. Instead of providing the thermometer 5 on the delivery side (see FIG. 1), a rolling load detector is attached to the leading rolling mill 2a as the rolling load detector 12, and the other equipment configuration is the same as in FIG. Since it is the same, description is abbreviate | omitted.

圧延材１１が中間圧延機列１に到達した時点から、水冷制御装置１０により、圧延材１１の詳細なトラッキングが行なわれる。圧延材１１が中間圧延機列１の最後尾の圧延機１ｆに到達したかどうかは、メタルイン検出器６により検出される。そして、予め決定されている当該圧延材のパススケジュールと、線速検出器８によって検出される圧延速度と、入側温度計（入側温度検出器）４による圧延材の温度計測値から、中間水冷帯３を通過するときの、圧延材の長手方向の部位と温度と圧延速度とが対応づけられ、これらの値がリンクされて水冷制御装置１０に取り込まれる。メタル検出器６により圧延材先端が中間圧延機列１の最後尾の圧延機１ｆに達したことが検出されると、水冷制御装置１０により、この検出時点から圧延材１１の先端が中間水冷帯３に到達するまで時間が算出されて、この到達時間から、入側温度計４により、中間水冷帯３入側の圧延材長手方向の温度Ｔ１が所定の時間間隔で計測される。そして、この温度計測値Ｔ１は、前記のように、圧延材の長手方向の部位と対応づけて水冷制御装置１０に取り込まれている。次に、メタル検出器７により、圧延材１１の先端が、仕上げ圧延機列２の先頭圧延機２ａに到達したことが検出されると、水冷制御装置１０からの指令で、前記圧延負荷検出器１２により圧延材長手方向の所定の時間間隔で、すなわち、中間水冷帯３の入側で温度計測された圧延材１１の長手方向の部位に対応する部位に圧延負荷の圧延荷重Ｆが計測される。この計測した圧延荷重Ｆと予め設定した目標圧延荷重Ｆａとの差ΔＦに応じて、すなわち、計測負荷が目標負荷に一致するように、当該圧延材に対しては、中間水冷帯３の冷却水流量をフィ−ドバック制御する。また、次圧延材に対しては、冷却水流量および／または圧延速度の設定値（プリセット値）を調整する。   From the point of time when the rolled material 11 reaches the intermediate rolling mill row 1, the water cooling control device 10 performs detailed tracking of the rolled material 11. Whether or not the rolled material 11 has reached the last rolling mill 1f of the intermediate rolling mill row 1 is detected by the metal-in detector 6. And, from the predetermined pass schedule of the rolled material, the rolling speed detected by the linear velocity detector 8, and the temperature measurement value of the rolled material by the entry side thermometer (entrance side temperature detector) 4, an intermediate A portion in the longitudinal direction of the rolled material, the temperature, and the rolling speed when passing through the water cooling zone 3 are associated with each other, and these values are linked and taken into the water cooling control device 10. When it is detected by the metal detector 6 that the leading end of the rolled material has reached the last rolling mill 1f of the intermediate rolling mill row 1, the water cooling control device 10 causes the leading end of the rolled material 11 to move to the intermediate water cooling zone from this detection time. Time is calculated until it reaches 3, and from this arrival time, the temperature T1 in the longitudinal direction of the rolling material on the inlet side of the intermediate water cooling zone 3 is measured by the inlet side thermometer 4 at predetermined time intervals. And this temperature measurement value T1 is taken into the water-cooling control apparatus 10 corresponding to the site | part of the longitudinal direction of a rolling material as mentioned above. Next, when it is detected by the metal detector 7 that the leading end of the rolled material 11 has reached the leading rolling mill 2a of the finish rolling mill row 2, the rolling load detector is detected by a command from the water cooling control device 10. 12, the rolling load F of the rolling load is measured at a predetermined time interval in the longitudinal direction of the rolled material, that is, at a portion corresponding to the longitudinal portion of the rolled material 11 measured at the entrance side of the intermediate water cooling zone 3. . Depending on the difference ΔF between the measured rolling load F and a preset target rolling load Fa, that is, for the rolled material, the cooling water in the intermediate water cooling zone 3 is used so that the measured load matches the target load. Feedback control of the flow rate. For the next rolled material, the set value (preset value) of the cooling water flow rate and / or the rolling speed is adjusted.

前記当該圧延材に対する冷却水流量の制御は、目標圧延荷重Ｆａからの差ΔＦに対して、水冷帯の冷却水流量ＷａをΔＦに対応する冷却水流量ΔＷａだけ補正する。なお、前記目標圧延荷重Ｆａとの差を比較する先頭圧延機２ａの圧延荷重Ｆは、計測圧延荷重のバラツキを考慮して、圧延材長手方向の複数の計測圧延荷重の平均値（Ｆａｖ．）である。したがって、ΔＦ＝ABS(Ｆａ−Ｆ)＝ABS(Ｆａ−Ｆａｖ．)である。同様に、中間冷却帯１入側の圧延材長手方向の温度Ｔ１として、先頭圧延機２ａの圧延荷重計測部位に対応する、圧延材長手方向の複数の計測温度の平均値（Ｔ１ａｖ．）が用いられる。この先頭圧延機２ａの計測圧延荷重Ｆおよび中間圧延機列１の入側の計測温度Ｔ１の平均化は、圧延材の長手方向に沿って、圧延荷重および温度計測部位グループについて繰り返される。そして、中間水冷帯３の入側の平均温度Ｔ１ａｖ．、前記先頭圧延機２ａの平均圧延荷重Ｆａｖ.、目標圧延荷重Ｆａからの荷重偏差ΔＦ、前記平均温度Ｔ１ａｖ．を算出した計測部位が中間水冷帯３を通過したときの冷却水流量Ｗａ（平均流量）、補正流量ΔＷａ（平均流量）、および圧延速度、当該圧延材の製品寸法（仕上げ線径）、鋼種が水冷制御装置１０の記憶部（図示省略）に記憶される。そして、同一ロットの次圧延材を含めて、同一鋼種または同一鋼種グループ、同一製品寸法の圧延材に対して、記憶した前記水冷制御結果に基づいて、中間水冷帯３の初期設定流量Ｗｐおよび目標圧延荷重Ｆａからの偏差単位圧延荷重あたりの補正流量ΔＷｕを修正して水冷制御精度を向上させる。なお、前記冷却水の初期設定流量Ｗｐは、鋼種、製品寸法、圧延速度等の圧延条件ごとに、中間水冷帯３の入側温度Ｔ１ａｖ.と前記先頭圧延機２ａの目標圧延荷重Ｆａに対して、水冷制御実績値等から予め求めておいた冷却水流量に基づいて決定することができる。また、目標温度からの偏差単位圧延荷重あたりの補正流量ΔＷｕは、当該圧延材に対する補正流量ΔＷａの平均値ΔＷａｍと、目標圧延荷重Ｆａと当該圧延材についての圧延荷重Ｆの平均荷重Ｆｍとの偏差に基づいて算出することが可能である。   The control of the cooling water flow rate for the rolled material corrects the cooling water flow rate Wa in the water cooling zone by the cooling water flow rate ΔWa corresponding to ΔF with respect to the difference ΔF from the target rolling load Fa. The rolling load F of the leading mill 2a for comparing the difference with the target rolling load Fa is an average value (Fav.) Of a plurality of measured rolling loads in the longitudinal direction of the rolled material in consideration of variations in the measured rolling load. It is. Therefore, ΔF = ABS (Fa−F) = ABS (Fa−Fav.). Similarly, an average value (T1av.) Of a plurality of measured temperatures in the longitudinal direction of the rolling material corresponding to the rolling load measurement site of the leading rolling mill 2a is used as the temperature T1 in the longitudinal direction of the rolled material on the entry side of the intermediate cooling zone 1. It is done. The averaging of the measured rolling load F of the first rolling mill 2a and the measured temperature T1 on the entry side of the intermediate rolling mill row 1 is repeated for the rolling load and temperature measurement part group along the longitudinal direction of the rolled material. And the average temperature T1av. The average rolling load Fav. Of the leading rolling mill 2a, the load deviation ΔF from the target rolling load Fa, the average temperature T1av. The measured water flow rate Wa (average flow rate), correction flow rate ΔWa (average flow rate), and rolling speed, product dimensions (finished wire diameter) of the rolled material, and steel type It is stored in a storage unit (not shown) of the water cooling control device 10. And, including the next rolled material of the same lot, the initial set flow rate Wp and the target of the intermediate water cooling zone 3 based on the stored water cooling control result for the rolled material of the same steel type or the same steel type group and the same product size. The correction flow rate ΔWu per unit rolling load deviating from the rolling load Fa is corrected to improve the water cooling control accuracy. In addition, the initial setting flow rate Wp of the cooling water is determined with respect to the inlet side temperature T1av. Of the intermediate water cooling zone 3 and the target rolling load Fa of the leading rolling mill 2a for each rolling condition such as a steel type, a product size, and a rolling speed. Further, it can be determined based on the cooling water flow rate obtained in advance from the water cooling control result value or the like. Further, the correction flow rate ΔWu per deviation unit rolling load from the target temperature is a deviation between the average value ΔWam of the correction flow rate ΔWa for the rolled material, and the target rolling load Fa and the average load Fm of the rolling load F for the rolling material. It is possible to calculate based on

前述の、先頭圧延機２ａ出側の圧延材の温度を計測する前記実施形態の場合と同様に、先頭圧延機２ａの圧延荷重を計測する上記実施形態の場合も、目標圧延荷重からの偏差に基づいた、水冷制御装置１０からの制御指令により、的確かつタイムリーに冷却水流量の調節弁を作動させるために、流量調節弁の動作は遅れを伴うことを考慮して、目標圧延荷重Ｆ２ａからの荷重偏差ΔＦに対する冷却水の補正流量ΔＷａを、次圧延材に対して早い目のタイミングで、すなわち、次圧延材の先端部が中間水冷帯３に到達する時点では、前記流量調節弁の開度が前記補正流量ΔＷａを取り込んだ初期設定流量（＝Ｗｐ＋ΔＷｐ（＝ΔＷａ））の弁開度となるように弁開度の動作指示を与えることが望ましい。   Similar to the above-described embodiment in which the temperature of the rolling material on the outlet side of the leading rolling mill 2a is measured, the deviation from the target rolling load also occurs in the above-described embodiment in which the rolling load of the leading rolling mill 2a is measured. Based on the control command from the water cooling control device 10, based on the target rolling load F2a in consideration of the fact that the operation of the flow rate adjusting valve is delayed in order to operate the cooling water flow rate adjusting valve accurately and in a timely manner. The correction flow rate ΔWa of the cooling water with respect to the load deviation ΔF of the next rolling material is opened at an early timing, that is, when the leading end of the next rolling material reaches the intermediate water cooling zone 3, the flow control valve is opened. It is desirable to give an operation instruction of the valve opening so that the degree becomes the valve opening of the initial set flow (= Wp + ΔWp (= ΔWa)) incorporating the correction flow ΔWa.

なお、上記の実施形態では、圧延負荷として圧延荷重Ｆを使用する形態を示したが、圧延負荷として、圧延ロールを駆動する電動機の負荷電流Ｉを使用することができる。また、圧延負荷として、圧延荷重または負荷電流のいずれを用いる場合でも、圧延速度を変化させると、圧延材の温度が同じでもこれらの圧延負荷が変化するため、前記目標圧延荷重Ｆａまたは目標負荷電流Ｉａは、圧延速度によって補正できるようにしておくことが望ましい。また、前記先頭圧延機２ａ出側の計測温度、および先頭圧延機２ａの計測圧延負荷は、中間水冷帯３の入側の圧延材温度と目標温度との偏差に基づいてフィ−ドフォワード制御を行なう場合にも使用することができる。   In addition, in said embodiment, although the form which uses the rolling load F as a rolling load was shown, the load current I of the electric motor which drives a rolling roll can be used as a rolling load. In addition, even when either a rolling load or a load current is used as the rolling load, if the rolling speed is changed, the rolling load changes even if the temperature of the rolled material is the same. Therefore, the target rolling load Fa or the target load current is changed. It is desirable that Ia can be corrected by the rolling speed. Further, the measured temperature on the outlet side of the leading rolling mill 2a and the measured rolling load of the leading rolling mill 2a are subjected to feedforward control based on the deviation between the rolling material temperature on the inlet side of the intermediate water cooling zone 3 and the target temperature. It can also be used when performing.

実施形態の水冷制御を行なう棒鋼／線材圧延設備のレイアウトの要部を示す説明図である。It is explanatory drawing which shows the principal part of the layout of the steel bar / wire rod rolling equipment which performs water cooling control of embodiment. 他の実施形態の水冷制御を行なう棒鋼／線材圧延設備のレイアウトの要部を示す説明図である。It is explanatory drawing which shows the principal part of the layout of the steel bar / wire rod rolling equipment which performs water cooling control of other embodiment. 中間水冷過程および復熱過程での圧延材の温度推移を示す説明図である。It is explanatory drawing which shows the temperature transition of the rolling material in an intermediate | middle water cooling process and a recuperation process.

符号の説明Explanation of symbols

１：中間圧延機列 １ａ〜１ｆ：圧延機 ２：仕上げ圧延機列
２ａ〜２ｆ：圧延機 ３：中間水冷帯 ４：入側温度計
５：出側温度計 ６、７：メタルイン（噛み込み）検出器
８、９：線速検出器 １０：水冷制御装置 １１：圧延材
１２：圧延負荷検出器 １３：仕上げ温度計 1: Intermediate rolling mill row 1a to 1f: Rolling mill 2: Finish rolling mill row 2a to 2f: Rolling mill 3: Intermediate water cooling zone 4: Incoming thermometer 5: Outgoing thermometer 6, 7: Metal-in (biting in) ) Detectors 8 and 9: Linear velocity detector 10: Water cooling controller 11: Rolled material 12: Rolling load detector 13: Finishing thermometer

Claims (4)

連続して多段に配置された圧延機で複数の圧延機列が形成され、上流側と下流側の圧延機列間に、冷却水流量調整手段を備えた水冷制御手段を有する水冷装置を配置した棒鋼または線材圧延設備での圧延材の水冷制御方法であって、前記水冷制御手段により、前記水冷装置で水冷後、前記下流側の圧延機列の先頭の圧延機出側での圧延材表面温度が所定の温度となるように前記水冷装置への冷却水供給流量を制御することを特徴とする圧延材の水冷制御方法。   A plurality of rolling mill rows are formed by rolling mills arranged in multiple stages continuously, and a water cooling device having a water cooling control means having a cooling water flow rate adjusting means is arranged between the upstream and downstream rolling mill rows. A method for controlling water cooling of a rolled material in a steel bar or wire rolling facility, wherein after the water cooling by the water cooling control means, the surface temperature of the rolled material on the outlet side of the first rolling mill in the downstream rolling mill row A method for controlling water cooling of a rolled material, wherein the flow rate of cooling water supplied to the water cooling device is controlled so that the temperature becomes a predetermined temperature. 連続して多段に配置された圧延機で複数の圧延機列が形成され、上流側と下流側の圧延機列間に、冷却水流量調整手段を備えた水冷制御手段を有する水冷装置を配置した棒鋼または線材圧延設備での圧延材の水冷制御方法であって、前記水冷制御手段により、前記水冷装置で圧延材を水冷後、前記下流側の圧延機列の先頭の圧延機出側での圧延材表面温度と予め設定した目標表面温度との偏差に基づき、次圧延材に対して前記水冷装置への冷却水供給流量および／または圧延速度の設定値を調整することを特徴とする圧延材の水冷制御方法。   A plurality of rolling mill rows are formed by rolling mills arranged in multiple stages continuously, and a water cooling device having a water cooling control means having a cooling water flow rate adjusting means is arranged between the upstream and downstream rolling mill rows. A method of controlling water cooling of a rolled material in a steel bar or wire rod rolling facility, wherein the water cooling control means performs water cooling of the rolled material with the water cooling device and then rolling on the outlet side of the first rolling mill in the downstream rolling mill row Based on the deviation between the material surface temperature and the preset target surface temperature, the set value of the cooling water supply flow rate and / or rolling speed to the water cooling device is adjusted for the next rolled material. Water cooling control method. 連続して多段に配置された圧延機で複数の圧延機列が形成され、上流側と下流側の圧延機列間に、冷却水流量調整手段を備えた水冷制御手段を有する水冷装置を配置した棒鋼または線材圧延設備での圧延材の水冷制御方法であって、前記水冷制御手段により、前記水冷装置で圧延材を水冷後、前記下流側の圧延機列の先頭の圧延機での圧延負荷が所定の圧延負荷となるように前記水冷装置への冷却水供給流量を制御することを特徴とする圧延材の水冷制御方法。   A plurality of rolling mill rows are formed by rolling mills arranged in multiple stages continuously, and a water cooling device having a water cooling control means having a cooling water flow rate adjusting means is arranged between the upstream and downstream rolling mill rows. A method for controlling water cooling of a rolled material in a steel bar or wire rod rolling facility, wherein after the water cooled by the water cooling device by the water cooling control means, the rolling load in the first rolling mill in the downstream rolling mill row is reduced. A method for controlling water cooling of a rolled material, wherein the flow rate of cooling water supplied to the water cooling device is controlled so as to achieve a predetermined rolling load. 連続して多段に配置された圧延機で複数の圧延機列が形成され、上流側と下流側の圧延機列間に、冷却水流量調整手段を備えた水冷制御手段を有する水冷装置を配置した棒鋼または線材圧延設備での圧延材の水冷制御方法であって、前記水冷制御手段により、前記水冷装置で圧延材を水冷後、前記下流側の圧延機列の先頭の圧延機の圧延負荷と予め設定した目標圧延負荷との偏差に基づき、次圧延材に対して前記水冷装置への冷却水供給流量および／または圧延速度の設定値を調整することを特徴とする圧延材の水冷制御方法。   A plurality of rolling mill rows are formed by rolling mills arranged in multiple stages continuously, and a water cooling device having a water cooling control means having a cooling water flow rate adjusting means is arranged between the upstream and downstream rolling mill rows. A method for controlling water cooling of a rolled material in a steel bar or wire rolling facility, wherein after the water cooled by the water cooling device by the water cooling control means, the rolling load of the first rolling mill in the downstream rolling mill row and A rolling material water cooling control method, comprising: adjusting a cooling water supply flow rate to the water cooling device and / or a setting value of a rolling speed for a next rolled material based on a deviation from a set target rolling load.
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Cited By (15)

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JP2009050893A (en) * 2007-08-27 2009-03-12 Kobe Steel Ltd Control method for cooling bar steel and wire rod
JP2010131644A (en) * 2008-12-05 2010-06-17 Kobe Steel Ltd Method of controlling supply of cooling water in water-cooling apparatus of bar and shape rolling equipment
CN103316930A (en) * 2013-06-11 2013-09-25 鞍钢股份有限公司 Cooling control method of wire rod for cold forging steel
CN103722009A (en) * 2014-01-06 2014-04-16 攀枝花钢城集团有限公司 Bar continuous rolling production line
CN103990653A (en) * 2013-02-19 2014-08-20 宝山钢铁股份有限公司 Finish rolling inlet temperature hitting precision ensuring method
CN104141039A (en) * 2014-06-27 2014-11-12 河北工程大学 Rolling technology for controlling decarbonization of 42CrMo steel bloom hot-rolled wire rod
CN104841701A (en) * 2014-02-14 2015-08-19 宝山钢铁股份有限公司 Sheet coiling temperature control method in big-speed-reduction rolling of hot-rolled strip steel
CN105728466A (en) * 2016-03-25 2016-07-06 绍兴焕鑫管业有限公司 Bright pipe body processing craft
CN106583450A (en) * 2016-12-27 2017-04-26 中铝瑞闽股份有限公司 Production technology for 5182 alloy wide-range thin strip
CN109675933A (en) * 2018-12-29 2019-04-26 北京勤泽鸿翔冶金科技有限公司 A kind of bar water cooling closed-loop control process and control system
CN110064975A (en) * 2019-05-06 2019-07-30 河南济源钢铁(集团)有限公司 A kind of process improving pinion steel face crack
CN110125174A (en) * 2019-03-28 2019-08-16 盐城市联鑫钢铁有限公司 A kind of HRB400E-F valve snail fine grain rolling mill practice method
CN112139240A (en) * 2020-08-11 2020-12-29 柳州钢铁股份有限公司 Production method for reducing performance line difference of reinforcing steel bar
CN112139239A (en) * 2020-08-11 2020-12-29 柳州钢铁股份有限公司 Split reinforcing steel bar with small performance line difference
CN114618889A (en) * 2022-03-23 2022-06-14 首钢水城钢铁（集团）有限责任公司 Bar hot rolling production method capable of avoiding steel punching accident of No. 17 rolling mill

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009050893A (en) * 2007-08-27 2009-03-12 Kobe Steel Ltd Control method for cooling bar steel and wire rod
JP2010131644A (en) * 2008-12-05 2010-06-17 Kobe Steel Ltd Method of controlling supply of cooling water in water-cooling apparatus of bar and shape rolling equipment
CN103990653A (en) * 2013-02-19 2014-08-20 宝山钢铁股份有限公司 Finish rolling inlet temperature hitting precision ensuring method
CN103316930A (en) * 2013-06-11 2013-09-25 鞍钢股份有限公司 Cooling control method of wire rod for cold forging steel
CN103722009A (en) * 2014-01-06 2014-04-16 攀枝花钢城集团有限公司 Bar continuous rolling production line
CN104841701A (en) * 2014-02-14 2015-08-19 宝山钢铁股份有限公司 Sheet coiling temperature control method in big-speed-reduction rolling of hot-rolled strip steel
CN104141039A (en) * 2014-06-27 2014-11-12 河北工程大学 Rolling technology for controlling decarbonization of 42CrMo steel bloom hot-rolled wire rod
CN105728466A (en) * 2016-03-25 2016-07-06 绍兴焕鑫管业有限公司 Bright pipe body processing craft
CN106583450A (en) * 2016-12-27 2017-04-26 中铝瑞闽股份有限公司 Production technology for 5182 alloy wide-range thin strip
CN109675933A (en) * 2018-12-29 2019-04-26 北京勤泽鸿翔冶金科技有限公司 A kind of bar water cooling closed-loop control process and control system
CN109675933B (en) * 2018-12-29 2020-10-09 北京勤泽鸿翔冶金科技有限公司 Rod water-cooling closed-loop control process method and control system
CN110125174A (en) * 2019-03-28 2019-08-16 盐城市联鑫钢铁有限公司 A kind of HRB400E-F valve snail fine grain rolling mill practice method
CN110064975A (en) * 2019-05-06 2019-07-30 河南济源钢铁(集团)有限公司 A kind of process improving pinion steel face crack
CN112139240A (en) * 2020-08-11 2020-12-29 柳州钢铁股份有限公司 Production method for reducing performance line difference of reinforcing steel bar
CN112139239A (en) * 2020-08-11 2020-12-29 柳州钢铁股份有限公司 Split reinforcing steel bar with small performance line difference
CN112139240B (en) * 2020-08-11 2023-04-07 柳州钢铁股份有限公司 Production method for reducing performance line difference of reinforcing steel bar
CN112139239B (en) * 2020-08-11 2023-04-14 柳州钢铁股份有限公司 Split reinforcing steel bar with small performance line difference
CN114618889A (en) * 2022-03-23 2022-06-14 首钢水城钢铁（集团）有限责任公司 Bar hot rolling production method capable of avoiding steel punching accident of No. 17 rolling mill
CN114618889B (en) * 2022-03-23 2024-04-16 首钢水城钢铁（集团）有限责任公司 Bar hot rolling production method capable of avoiding 17 # rolling mill steel punching accident

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