JP4709726B2 - Method for predicting width direction material of temper rolled steel sheet and operation method of continuous annealing line using the same - Google Patents

Method for predicting width direction material of temper rolled steel sheet and operation method of continuous annealing line using the same Download PDF

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JP4709726B2
JP4709726B2 JP2006299833A JP2006299833A JP4709726B2 JP 4709726 B2 JP4709726 B2 JP 4709726B2 JP 2006299833 A JP2006299833 A JP 2006299833A JP 2006299833 A JP2006299833 A JP 2006299833A JP 4709726 B2 JP4709726 B2 JP 4709726B2
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steel sheet
width direction
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rolled steel
furnace
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JP2008115426A (en
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俊樹 野中
貢一 後藤
忠明 四釜
敏 加藤
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Nippon Steel Corp
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本発明は、連続焼鈍炉を持つ連続処理ライン、例えば連続焼鈍設備や溶融めっき設備の出側に調質圧延機を配置した連続処理ラインにおける調質圧延鋼板の材質予測方法及びこれを用いた連続焼鈍ラインの操業方法に関するものである。   The present invention relates to a method for predicting the quality of a temper rolled steel sheet in a continuous processing line having a continuous annealing furnace, for example, a continuous processing line in which a temper rolling mill is disposed on the outlet side of a continuous annealing facility or a hot dipping plating facility, and a continuous process using the same. It relates to the method of operating the annealing line.

連続焼鈍炉の出側に調質圧延機を配置した連続焼鈍ラインにおいては、炉内における加熱・均熱条件や冷却条件が調質圧延鋼板の材質に大きな影響を及ぼす。このため従来から連続焼鈍炉の内部における板温制御を高精度化し、材質を安定させる努力が行われていた。しかし例えば鋼板成分が変動するなどの前工程起因の材質バラツキが存在するような場合には、単に連続焼鈍炉の板温制御を高精度化しても、材質変動を避けることができなかった。特に近年、自動車部品の成形精度向上の観点からハイテン材(高強度鋼板)の材質バラツキ低減、特に引張強度の安定を求められているが、従来法では自動車メーカーの要求に完全に応えることができなかった。   In a continuous annealing line in which a temper rolling mill is arranged on the outlet side of the continuous annealing furnace, heating / soaking conditions and cooling conditions in the furnace have a great influence on the material of the temper rolled steel sheet. For this reason, conventionally, efforts have been made to make the temperature control inside the continuous annealing furnace highly accurate and stabilize the material. However, for example, in the case where there is a material variation due to the previous process such as a change in the steel plate component, even if the plate temperature control of the continuous annealing furnace is simply made highly accurate, the material variation cannot be avoided. In recent years, in particular, from the viewpoint of improving the molding accuracy of automobile parts, there has been a demand for material variation reduction of high-tensile materials (high-strength steel plates), especially the stability of tensile strength, but the conventional method can fully meet the demands of automobile manufacturers. There wasn't.

なお特許文献1には、連続焼鈍炉と調質圧延機との間に鋼板温度の制御手段を設け、環境温度の影響をなくして調質圧延鋼板の材質安定を図る技術が開示されている。しかしこの方法も、前工程起因の材質バラツキが存在するような場合には、効果がなかった。また、特許文献2には、調質圧延装置の張力変動量によって焼鈍温度を制御する方法が提案されている。しかし、この方法は、単に張力変動にのみ着目したものであって、調質圧延荷重が一定条件の必要があり、圧延荷重が変動するような場合には、予測精度に問題があった。このため、従来は製造された後の調質圧延鋼板の材質をオフラインで検査し、その結果を連続焼鈍ラインの製造条件にフィードバックする方法が採用されてきた。しかしこの方法ではフィードバックに時間がかかるため、大量の規格外れ品が発生してしまうことがあった。   Patent Document 1 discloses a technique for providing a steel plate temperature control means between a continuous annealing furnace and a temper rolling mill to stabilize the material quality of the temper rolled steel plate by eliminating the influence of the environmental temperature. However, this method also has no effect when there is material variation due to the previous process. Patent Document 2 proposes a method of controlling the annealing temperature by the amount of tension fluctuation of the temper rolling apparatus. However, this method focuses only on the tension fluctuation, and the temper rolling load needs to be constant, and there is a problem in prediction accuracy when the rolling load fluctuates. For this reason, conventionally, a method has been adopted in which the material of the temper rolled steel sheet after being manufactured is inspected off-line and the result is fed back to the manufacturing conditions of the continuous annealing line. However, since this method takes time for feedback, a large amount of non-standard products may occur.

しかも従来は調質圧延鋼板の長手方向の材質変動のみが問題とされており、鋼板幅方向の材質変動を考慮した例はなかった。例えば特許文献2の方法においても調質圧延装置の張力は板幅全体の平均値として検出されるものであり、鋼板幅方向のバラツキを検出することは不可能であった。
特開平6−344019号公報 特開平6−10055号公報
Moreover, conventionally, only the material fluctuation in the longitudinal direction of the temper rolled steel sheet has been a problem, and there has been no example considering the material fluctuation in the steel sheet width direction. For example, even in the method of Patent Document 2, the tension of the temper rolling apparatus is detected as an average value of the entire sheet width, and it is impossible to detect variations in the sheet width direction.
JP-A-6-344019 JP-A-6-10055

本発明は上記した従来の問題点を解決し、鋼板幅方向に複数に分割されたバックアップロールを装備する調質圧延機の圧延実績により鋼板の材質予測、特に幅方向の材質予測を行うと共に、鋼板成分が変動するなどの前工程起因の材質バラツキが存在する場合にも、速やかに連続焼鈍ラインにフィードバックを行うことができ、しかも調質圧延鋼板の板幅方向の材質変動をも抑制することができる調質圧延鋼板の幅方向材質予測方法及びこれを用いた連続焼鈍ラインの操業方法を提供することを目的とするものである。   The present invention solves the above-described conventional problems, performs the steel sheet material prediction by the rolling performance of the temper rolling mill equipped with a backup roll divided into a plurality of steel sheet width directions, in particular the material prediction in the width direction, Even when there is material variation due to the previous process, such as fluctuations in steel plate components, it is possible to promptly feed back to the continuous annealing line and also suppress material fluctuation in the width direction of temper rolled steel sheets. An object of the present invention is to provide a method for predicting the width direction material of a temper rolled steel sheet and a method for operating a continuous annealing line using the same.

上記の課題を解決するためになされた請求項1の発明は、調質圧延鋼板の幅方向材質予測方法に関するもので、連続焼鈍炉の出側に、鋼板幅方向に複数に分割されたバックアップロールを装備する調質圧延機を配置し、この調質圧延機における伸び率、張力、鋼板幅方向の圧延荷重の値を測定するとともに、鋼板の板厚、板幅を測定するか上位計算機より入手し、これらの値に基づいて調質圧延鋼板の幅方向材質予測を行うことを特徴とするものである。なお、調質圧延鋼板の幅方向材質予測を、鋼板の全長にわたり行うことが好ましく、調質圧延鋼板の幅方向材質予測を、調質圧延機における伸び率、張力、圧延荷重の値と、鋼板の板厚、板幅から鋼板の降伏点を算出する予測式を用いて行うことが好ましい。   The invention of claim 1 made to solve the above-mentioned problem relates to a method for predicting the material in the width direction of a temper rolled steel sheet, and a backup roll divided into a plurality in the width direction of the steel sheet on the exit side of the continuous annealing furnace. A temper rolling mill equipped with a temper rolling mill is installed, and the elongation, tension, and rolling load values in the temper rolling mill are measured, and the thickness and width of the steel sheet are measured or obtained from a host computer. And based on these values, the width direction material prediction of a temper rolled steel sheet is performed. In addition, it is preferable to perform the width direction material prediction of the temper rolled steel sheet over the entire length of the steel plate, and the width direction material prediction of the temper rolled steel sheet is performed using the elongation rate, tension, rolling load value in the temper rolling mill, and the steel plate. It is preferable to use a prediction formula for calculating the yield point of the steel plate from the plate thickness and the plate width.

また請求項4の発明は、連続焼鈍ラインの操業方法に関するものであり、請求項1〜3の何れかの方法により調質圧延鋼板の幅方向材質予測を行い、予測結果に基づいて連続焼鈍炉の徐冷炉および/または急冷炉の操業条件をフィードバック制御することを特徴とするものである。なお、徐冷炉および/または急冷炉の冷却媒体が水、気水、ガスのいずれか1種または2種以上の併用であって、徐冷炉および/または急冷炉の冷却手段が鋼板幅方向の冷却制御手段を有し、フィードバック制御する操業条件が、冷却媒体の鋼板幅方向の流量であることが好ましい。   Moreover, invention of Claim 4 is related with the operating method of a continuous annealing line, The width direction material prediction of the tempered rolled steel plate is performed by the method in any one of Claims 1-3, and a continuous annealing furnace is based on a prediction result. The control conditions of the slow cooling furnace and / or the rapid cooling furnace are feedback-controlled. The cooling medium of the slow cooling furnace and / or the quenching furnace is one or more of water, air water, and gas, and the cooling means of the slow cooling furnace and / or the quenching furnace is a cooling control means in the steel sheet width direction. It is preferable that the operating condition for feedback control is a flow rate of the cooling medium in the width direction of the steel plate.

請求項1〜3の発明によれば、前工程起因の材質バラツキが存在する場合にも、調質圧延機における伸び率、張力、鋼板幅方向の圧延荷重の値と、鋼板の板厚、板幅とから直ちに板幅方向の材質予測を行うことができる。また請求項4〜5の発明によれば、予測材質が板幅方向に一定となるように連続焼鈍炉の徐冷炉および/または急冷炉の操業条件をフィードバック制御することにより、調質圧延鋼板の板幅方向の材質バラツキをなくすことができる。このほか本発明によれば、連続焼鈍炉の板温計に異常が発生したような場合にも直ちに異常発生を検出でき、規格外れ品の発生を抑制することができる。なお本発明は鋼板の長手方向の材質予測やその変動抑制にも適用できることはいうまでもない。   According to the first to third aspects of the invention, even when there is material variation due to the previous process, the elongation rate, tension, rolling load value in the temper rolling mill, steel plate thickness, plate The material prediction in the plate width direction can be performed immediately from the width. Further, according to the inventions of claims 4 to 5, the plate of the temper rolled steel sheet is controlled by feedback controlling the operating conditions of the slow annealing furnace and / or the quenching furnace of the continuous annealing furnace so that the predicted material is constant in the sheet width direction. It is possible to eliminate material variations in the width direction. In addition, according to the present invention, even when an abnormality occurs in the plate thermometer of the continuous annealing furnace, the occurrence of the abnormality can be detected immediately, and the generation of nonstandard products can be suppressed. Needless to say, the present invention can also be applied to the prediction of the material in the longitudinal direction of the steel sheet and the suppression of variations thereof.

以下に本発明の好ましい実施形態を説明する。
図1は鋼板の連続焼鈍ラインを模式的に示した図であり、1は連続焼鈍炉、2はその出側に配置された調質圧延機である。連続焼鈍炉1は昇温炉3、均熱炉4、冷却炉5、急冷炉6などに大別されている。払出しリール7から払い出された鋼板は連続焼鈍炉1の内部を走行する間に鋼板の材質に適した温度に加熱焼鈍されたうえ、冷却炉5、急冷炉6で焼入れされ、調質圧延機2で調質圧延されたうえで巻き取りリール8に巻き取られる。なお、連続焼鈍炉1と調質圧延機2との間に過時効炉や冷却炉、表面処理鋼板を製造するための溶融メッキ設備、合金化設備、電気メッキ設備などの表面処理設備を付設してもよい。
Hereinafter, preferred embodiments of the present invention will be described.
FIG. 1 is a diagram schematically showing a continuous annealing line of a steel sheet, wherein 1 is a continuous annealing furnace, and 2 is a temper rolling mill arranged on the outlet side thereof. The continuous annealing furnace 1 is roughly divided into a heating furnace 3, a soaking furnace 4, a cooling furnace 5, a quenching furnace 6, and the like. The steel sheet delivered from the delivery reel 7 is heated and annealed to a temperature suitable for the material of the steel sheet while traveling inside the continuous annealing furnace 1 and then quenched in the cooling furnace 5 and the quenching furnace 6. 2 is temper rolled in 2 and wound on the take-up reel 8. In addition, surface treatment equipment such as an overaging furnace, a cooling furnace, a hot dipping equipment for manufacturing surface-treated steel sheets, an alloying equipment, and an electroplating equipment is attached between the continuous annealing furnace 1 and the temper rolling mill 2. May be.

調質圧延機2では軽圧下による調質圧延が行われるが、本発明では調質圧延機2として、図2に示すように鋼板幅方向に複数に分割されたバックアップロール9を装備する調質圧延機2を用いる。分割された各バックアップロール9には圧延荷重計10が設けられており、ワークロール11が鋼板を調質圧延する際の圧延荷重を、鋼板幅方向の複数点で測定する。図2ではバックアップロール9の分割数は5であるが、分割数をより多くすることもできる。またテンションメーターロール12によってトータル張力値を測定することができ、調質圧延機2の出側に設置された板厚計13と板幅計14によって調質圧延鋼板の板厚と板幅を測定できる。なお圧延張力はトータル張力値を、板厚、板幅で除した単位断面積あたりの値を使用する。   In the temper rolling mill 2, temper rolling is performed by light reduction. In the present invention, the temper rolling mill 2 is equipped with a backup roll 9 divided into a plurality of pieces in the width direction of the steel sheet as shown in FIG. A rolling mill 2 is used. Each divided backup roll 9 is provided with a rolling load meter 10 and measures the rolling load when the work roll 11 temper rolls the steel sheet at a plurality of points in the width direction of the steel sheet. In FIG. 2, the number of divisions of the backup roll 9 is 5, but the number of divisions can be increased. The total tension value can be measured by the tension meter roll 12, and the thickness and width of the temper rolled steel sheet are measured by the thickness gauge 13 and the width gauge 14 installed on the exit side of the temper rolling mill 2. it can. The rolling tension uses a value per unit cross-sectional area obtained by dividing the total tension value by the plate thickness and the plate width.

本発明では、ハイテン鋼板の材質予測を正確に行うべく、調質圧延機2の張力、伸び率のみならず、調質圧延機2の鋼板幅方向の圧延荷重をも取り入れて材質予測をする。図3及び図4にハイテン鋼板での圧延荷重とハイテン鋼板との降伏点との相関を示す。また図5及び図6に当該ハイテン鋼板での圧延荷重と抗張力との相関を示す。すなわち実績データによれば、図3及び図4に示されるように伸び率が同じであれば圧延荷重、張力が増加すると調質圧延鋼板の降伏点(YP)が増加し、また図5及び図6に示すように抗張力(TS)も増加している。また圧延荷重もしくは張力が一定であっても、伸び率が低い方が降伏点(YP)及び抗張力(TS)が大きくなる。このことから、圧延荷重、張力、伸び率、調質圧延鋼板の材質(YP、TS)との間には強い相関があることが分る。   In the present invention, in order to accurately predict the material quality of the high-tensile steel plate, not only the tension and elongation of the temper rolling mill 2 but also the rolling load in the width direction of the temper rolling mill 2 is taken into account. 3 and 4 show the correlation between the rolling load in the high-tensile steel plate and the yield point of the high-tensile steel plate. 5 and 6 show the correlation between the rolling load and tensile strength of the high-tensile steel plate. That is, according to the results data, if the elongation is the same as shown in FIGS. 3 and 4, the yield point (YP) of the temper rolled steel sheet increases as the rolling load and tension increase, and FIGS. As shown in FIG. 6, the tensile strength (TS) is also increased. Even if the rolling load or tension is constant, the yield point (YP) and the tensile strength (TS) increase as the elongation rate is lower. From this, it can be seen that there is a strong correlation between the rolling load, tension, elongation, and material (YP, TS) of the temper rolled steel sheet.

そこで過去の操業実績に基づいて、調質圧延鋼板の材質予測式を作成した。調質圧延の理論式として知られるROBERTSの式には、材質(YP、TS)、伸び率、張力、摩擦係数、厚み、圧延速度、ロール径などの多くの影響因子が含まれており、これらの因子を精度よく用いることで、高精度な材質予測が可能になることから、本発明の一例として、下記の材質予測式を作成した。影響因子としては、調質圧延機の伸び率(%)、調質圧延機の張力(MPa)、鋼板の板厚(mm)、調質圧延機の圧延荷重と鋼板の板巾から算出される線荷重(ton/m)を用いている。   Therefore, based on past operational results, a material prediction formula for temper rolled steel sheet was created. The ROBERTS formula, known as the theoretical formula for temper rolling, includes many influential factors such as material (YP, TS), elongation, tension, friction coefficient, thickness, rolling speed, roll diameter, etc. Since the material can be accurately predicted by using the above factor with high accuracy, the following material prediction formula was created as an example of the present invention. The influential factors are calculated from the elongation (%) of the temper rolling mill, the tension (MPa) of the temper rolling mill, the sheet thickness (mm), the rolling load of the temper rolling mill and the sheet width of the steel sheet. Line load (ton / m) is used.

YP=a*伸び率(%)+b*(平均張力MPa)+c*(鋼板の板厚mm*線荷重ton/m)+d
この式中、YPは降伏点であって単位はMPa、SPM%は伸び率、線荷重は圧延荷重を鋼板の幅で割った値である。この式に含まれる係数は重回帰分析により定めるが、前記式のa, b,c, dの具体的な数値や式の形態は各ラインの特性や通板される鋼板の強度によって定められるものであり、上記に限定されるものではないことはいうまでもない。
YP = a * Elongation rate (%) + b * (Average tension MPa) + c * (Steel sheet thickness mm * Line load ton / m) + d
In this equation, YP is the yield point, the unit is MPa, SPM% is the elongation rate, and the line load is a value obtained by dividing the rolling load by the width of the steel sheet. The coefficients included in this equation are determined by multiple regression analysis, but the specific values of a, b, c, d in the above equation and the form of the equation are determined by the characteristics of each line and the strength of the steel plate Needless to say, the present invention is not limited to the above.

この式により予測されたYPは図7に示すとおり実績YPとよく一致する(重相関係数0.925)ことが確認された。また調質圧延鋼板のYPとTSとの間には図8に示すとおり強い相関があるので、この図8に示されたTS=e*YP+fの関係を利用してTSを予測し、実績TSとの関係を確認すると図9にようになり、上記の材質予測式によって調質圧延鋼板の材質を正確に予測できることが確認された。   As shown in FIG. 7, it was confirmed that the YP predicted by this equation was in good agreement with the actual YP (multiple correlation coefficient 0.925). Further, since there is a strong correlation between YP and TS of the temper rolled steel sheet as shown in FIG. 8, TS is predicted using the relationship of TS = e * YP + f shown in FIG. When the relationship with the record TS is confirmed, it is as shown in FIG. 9, and it was confirmed that the material of the temper rolled steel sheet can be accurately predicted by the material prediction formula.

上記したように、調質圧延機2における伸び率、張力、圧延荷重と、鋼板の板厚、板幅とに基づいて調質圧延鋼板の材質予測を正確に行うことができるが、本発明では図2に示したように分割されたバックアップロール9を装備する調質圧延機2を用いるため、鋼板幅方向の分割されたバックアップロール毎の圧延荷重の値を測定することができる。これにより前述の式を分割されたバックアップロール毎に計算し、鋼板幅方向の材質予測が可能となる。尚、前述の式のa、b、c、d、e、fの具体的な数値や式の形態は分割されたバックアップロール毎に同じでも異なっても構わない。また当業者には自明であるが、TSとYPとの関係も鋼種によって変化するため、鋼種に応じた式、例えば高次の式や各種関数を用いた式を用いても構わず、前記式の形態に限定されない。また前述の式のa、b、c、d、e、fは各ラインの特性や鋼種によって定められるもので特に限定されない。   As described above, the material prediction of the temper rolled steel sheet can be accurately performed based on the elongation rate, tension, rolling load in the temper rolling mill 2, and the thickness and width of the steel sheet. Since the temper rolling mill 2 equipped with the divided backup roll 9 as shown in FIG. 2 is used, the value of the rolling load for each divided backup roll in the steel plate width direction can be measured. Thereby, the above-mentioned formula is calculated for each divided backup roll, and material prediction in the steel plate width direction becomes possible. It should be noted that the specific numerical values of a, b, c, d, e, and f in the above formula and the form of the formula may be the same or different for each divided backup roll. As is obvious to those skilled in the art, since the relationship between TS and YP also changes depending on the steel type, an expression corresponding to the steel type, for example, an expression using higher-order expressions or various functions may be used. It is not limited to the form. In addition, a, b, c, d, e, and f in the above formula are not particularly limited and are determined by the characteristics of each line and the steel type.

また図2では鋼板幅方向の圧延荷重の値を測定したが、図10に示すようにテンションメーターロール12の胴長方向に圧電素子15を多数設置し、接触圧の大小により形状を検出し、その形状情報から張力の幅方向分布を推測し、分割されたバックアップロール9の各位置毎に張力値及び単位断面積当たりの張力を求めれば、鋼板幅方向の材質予測をさらに精度よく行うことが可能となる。   In FIG. 2, the value of the rolling load in the width direction of the steel plate was measured. As shown in FIG. 10, a large number of piezoelectric elements 15 were installed in the body length direction of the tension meter roll 12, and the shape was detected by the magnitude of the contact pressure. If the distribution in the width direction of tension is estimated from the shape information and the tension value and the tension per unit cross-sectional area are obtained for each position of the divided backup roll 9, the material prediction in the width direction of the steel sheet can be performed more accurately. It becomes possible.

本発明の一例では、調質圧延機2において連続的に検出された鋼板幅方向の圧延荷重、張力、伸び率と、調質圧延機2の後方に位置する板厚計13、板巾計14において連続的に検出された板厚、板巾は図1に示すプロセスコンピュータ16に入力され、プロセスコンピュータ16に入力されている調質圧延鋼板のYP算出式、TS算出式に代入されて計算され、リアルタイムで現在圧延中の鋼板幅方向の材質を把握することができる。なお、板厚、板巾の値はプロセスコンピュータ16の上位計算機であるビジコン17より入手しても構わない。   In an example of the present invention, the rolling load, tension, and elongation rate in the steel sheet width direction continuously detected in the temper rolling mill 2, and the thickness gauge 13 and the sheet width gauge 14 located at the rear of the temper rolling mill 2. 1 is input to the process computer 16 shown in FIG. 1, and is substituted into the YP calculation formula and TS calculation formula of the tempered rolled steel sheet input to the process computer 16 and calculated. The material in the width direction of the steel sheet currently being rolled can be grasped in real time. The values of the plate thickness and the plate width may be obtained from the vidicon 17 which is a host computer of the process computer 16.

このため演算された調質圧延鋼板のYPやTSに変動が生じた場合には直ちに異常発生の警報を出すことができ、従来のように大量の規格外れ品を発生させることがない。また異常発生の原因が、鋼板成分変動などの前工程起因の材質バラツキである場合にも、圧延荷重、張力、伸び率の変動として現れるので、直ちに異常発生を把握することができる。このように調質圧延機2を材質変動のモニターとして利用するのは、従来に例を見ない新規な技術である。   For this reason, when fluctuations occur in the calculated YP and TS of the temper rolled steel sheet, an alarm of occurrence of an abnormality can be immediately issued, and a large amount of off-standard products are not generated as in the prior art. In addition, even when the cause of the abnormality is a material variation due to a previous process such as a steel plate component fluctuation, it appears as a fluctuation in rolling load, tension, and elongation rate, so that the occurrence of the abnormality can be immediately grasped. The use of the temper rolling mill 2 as a material fluctuation monitor in this way is a novel technique that has never been seen before.

上記したように、本発明によれば板幅方向及び長手方向について調質圧延鋼板のYPやTSの予測が可能であるが、請求項4以下の発明では、得られた予測結果に基づいて連続焼鈍炉1の徐冷炉5および/または急冷炉6の操業条件をフィードバック制御する。しかもそのフィードバック制御は、板幅方向のバラツキを考慮して行うことが好ましい。   As described above, according to the present invention, it is possible to predict the YP and TS of the temper rolled steel sheet in the sheet width direction and the longitudinal direction. However, in the invention of claim 4 and below, it is continuous based on the obtained prediction result. The operating conditions of the slow cooling furnace 5 and / or the rapid cooling furnace 6 of the annealing furnace 1 are feedback-controlled. In addition, the feedback control is preferably performed in consideration of variations in the plate width direction.

図11はその具体例を示すもので、急冷炉6に設置された冷却手段18を鋼板幅方向に分割されたものとしておき、冷却流体の流量を冷却制御手段である制御弁19によって鋼板幅方向に可変としておく。そして幅方向材質予測の結果に基づいて、鋼板幅方向の冷却流量を制御する。なお、冷却媒体は水、気水、ガスのいずれか1種または2種以上の併用とすることができる。これによって鋼板幅方向の材質バラツキを抑制することができる。   FIG. 11 shows a specific example thereof. The cooling means 18 installed in the quenching furnace 6 is assumed to be divided in the steel plate width direction, and the flow rate of the cooling fluid is controlled by the control valve 19 serving as the cooling control means in the steel plate width direction. To be variable. And based on the result of width direction material prediction, the cooling flow volume of the steel plate width direction is controlled. The cooling medium can be any one of water, air and gas, or a combination of two or more. Thereby, material variation in the steel plate width direction can be suppressed.

また図12に示すように、鋼板幅方向の張力値をも測定して幅方向材質予測を行い、その幅方向材質予測の結果に基づいて、鋼板幅方向に冷却を制御することにより、更に好ましい結果が得られる。   Further, as shown in FIG. 12, it is more preferable to measure the tension value in the width direction of the steel sheet and perform the width direction material prediction, and to control the cooling in the width direction of the steel sheet based on the result of the width direction material prediction. Results are obtained.

図13は従来法と本発明法とにより製造されたハイテン調質圧延鋼板の板幅方向のYPのバラツキを示すグラフであり、表1はその測定データを示す表である。この例では15分割したバックアップロールを使用し、ワークサイドから順に1、2、3の番号を付した。なお表1中の左端欄は冷却制御を行わなかった場合、右端欄は冷却制御を行った場合のデータである。従来法では鋼板幅方向のYPの最大値‐最小値の差は34MPaであったが、本発明による冷却制御を行えば、11MPaにまで小さくなったことが分る。   FIG. 13 is a graph showing the variation of YP in the sheet width direction of the high-tensile temper rolled steel sheet produced by the conventional method and the method of the present invention, and Table 1 shows the measurement data. In this example, 15 backup rolls were used, and numbers 1, 2, and 3 were assigned in order from the work side. The leftmost column in Table 1 is data when cooling control is not performed, and the rightmost column is data when cooling control is performed. In the conventional method, the difference between the maximum value and the minimum value of YP in the steel plate width direction was 34 MPa, but it can be seen that the cooling control according to the present invention has reduced the pressure to 11 MPa.

このようにフィードバック制御を行えば、前工程起因の材質バラツキや、連続焼鈍炉内における板温の変動に起因する板幅方向の材質バラツキが発生しても直ちに自動修正を加え、調質圧延鋼板の材質安定を図ることができる。また鋼板の長手方向の材質バラツキにも対応できることはいうまでもない。これにより自動車メーカーからのハイテン材(高強度鋼板)の材質バラツキ低減の要求にも応えることが可能となった。   If feedback control is performed in this way, even if material variation due to the previous process or material variation in the sheet width direction due to variation in sheet temperature in the continuous annealing furnace occurs, automatic correction is immediately made, and the temper rolled steel sheet The material can be stabilized. Needless to say, it is possible to cope with material variations in the longitudinal direction of the steel sheet. This has made it possible to meet the demands from automobile manufacturers for reducing material variations in high-tensile materials (high-strength steel plates).

連続焼鈍ラインの模式図である。It is a schematic diagram of a continuous annealing line. 本発明の幅方向材質予測方法の実施形態を示す斜視図である。It is a perspective view which shows embodiment of the width direction material prediction method of this invention. 圧延荷重とYPとの相関を示すグラフである。It is a graph which shows the correlation of rolling load and YP. 圧延張力とYPとの相関を示すグラフである。It is a graph which shows the correlation between rolling tension and YP. 圧延荷重とTSとの相関を示すグラフである。It is a graph which shows the correlation with a rolling load and TS. 圧延張力とTSとの相関を示すグラフである。It is a graph which shows the correlation between rolling tension and TS. 予測YPと実績YPとの相関を示すグラフである。It is a graph which shows the correlation with prediction YP and performance YP. YPとTSの関係を示すグラフである。It is a graph which shows the relationship between YP and TS. 予測TSと実績TSとの相関を示すグラフである。It is a graph which shows the correlation with prediction TS and track record TS. 本発明の幅方向材質予測方法の他の実施形態を示す斜視図である。It is a perspective view which shows other embodiment of the width direction material prediction method of this invention. 本発明の操業方法の実施形態を示す斜視図である。It is a perspective view which shows embodiment of the operating method of this invention. 本発明の操業方法の他の実施形態を示す斜視図である。It is a perspective view which shows other embodiment of the operating method of this invention. ハイテン調質圧延鋼板の板幅方向のYPのバラツキを示すグラフである。It is a graph which shows the variation of YP of the board width direction of a high ten tempered rolled steel plate.

符号の説明Explanation of symbols

1 連続焼鈍炉
2 調質圧延機
3 昇温炉
4 均熱炉
5 冷却炉
6 急冷炉
7 払出しリール
8 巻き取りリール
9 分割されたバックアップロール
10 圧延荷重計
11 ワークロール
12 テンションメーターロール
13 板厚計
14 板幅計
15 圧電素子
16 プロセスコンピュータ
17 ビジコン
18 冷却手段
19 制御弁
DESCRIPTION OF SYMBOLS 1 Continuous annealing furnace 2 Temper rolling mill 3 Temperature raising furnace 4 Soaking furnace 5 Cooling furnace 6 Quenching furnace 7 Dispensing reel 8 Take-up reel 9 Divided backup roll 10 Rolling load meter 11 Work roll 12 Tension meter roll 13 Plate thickness Total 14 Plate width meter 15 Piezoelectric element 16 Process computer 17 Vidicon 18 Cooling means 19 Control valve

Claims (5)

連続焼鈍炉の出側に、鋼板幅方向に複数に分割されたバックアップロールを装備する調質圧延機を配置し、この調質圧延機における伸び率、張力、鋼板幅方向の圧延荷重の値を測定するとともに、鋼板の板厚、板幅を測定するか上位計算機より入手し、これらの値に基づいて調質圧延鋼板の幅方向材質予測を行うことを特徴とする調質圧延鋼板の幅方向材質予測方法。   On the exit side of the continuous annealing furnace, a temper rolling mill equipped with multiple backup rolls divided in the steel sheet width direction is arranged, and the elongation rate, tension, and rolling load value in the steel sheet width direction in this temper rolling mill are set. The width direction of the temper rolled steel sheet is characterized by measuring the thickness and width of the steel sheet or obtaining it from a host computer, and performing material direction prediction of the temper rolled steel sheet based on these values. Material prediction method. 調質圧延鋼板の幅方向材質予測を、鋼板の全長にわたり行うことを特徴とする請求項1記載の調質圧延鋼板の幅方向材質予測方法。   The width direction material prediction method of the temper rolled steel sheet according to claim 1, wherein the width direction material prediction of the temper rolled steel sheet is performed over the entire length of the steel sheet. 調質圧延鋼板の幅方向材質予測を、調質圧延機における伸び率、張力、圧延荷重の値と、鋼板の板厚、板幅から鋼板の降伏点を算出する予測式を用いて行うことを特徴とする請求項1または2記載の調質圧延鋼板の幅方向材質予測方法。   Predicting the material in the width direction of a temper rolled steel sheet using a prediction formula for calculating the yield point of a steel sheet from the values of elongation, tension, rolling load in the temper rolling mill and the thickness and width of the steel sheet. The width direction material prediction method of the temper rolled steel sheet of Claim 1 or 2 characterized by the above-mentioned. 請求項1〜3の何れかの方法により調質圧延鋼板の幅方向材質予測を行い、予測結果に基づいて連続焼鈍炉の徐冷炉および/または急冷炉の操業条件をフィードバック制御することを特徴とする連続焼鈍ラインの操業方法。   The material in the width direction of the temper rolled steel sheet is predicted by the method according to any one of claims 1 to 3, and the operation conditions of the slow cooling furnace and / or the quenching furnace of the continuous annealing furnace are feedback controlled based on the prediction result. Operation method of continuous annealing line. 徐冷炉および/または急冷炉の冷却媒体が水、気水、ガスのいずれか1種または2種以上の併用であって、徐冷炉および/または急冷炉の冷却手段が鋼板幅方向の冷却制御手段を有し、フィードバック制御する操業条件が、冷却媒体の鋼板幅方向の流量であることを特徴とする請求項4記載の連続焼鈍ラインの操業方法。   The cooling medium of the slow cooling furnace and / or the quenching furnace is one or a combination of two or more of water, air and gas, and the cooling means of the slow cooling furnace and / or the quenching furnace has a cooling control means in the steel sheet width direction. The operation method of the continuous annealing line according to claim 4, wherein the operation condition for feedback control is a flow rate of the cooling medium in the width direction of the steel sheet.
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