JP6658457B2 - Thick steel plate manufacturing method and rolling pass schedule setting method - Google Patents
Thick steel plate manufacturing method and rolling pass schedule setting method Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims description 288
- 238000000034 method Methods 0.000 title claims description 32
- 229910000831 Steel Inorganic materials 0.000 title claims description 22
- 239000010959 steel Substances 0.000 title claims description 22
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 239000000463 material Substances 0.000 claims description 63
- 239000013077 target material Substances 0.000 claims description 32
- 238000001816 cooling Methods 0.000 claims description 21
- 238000010586 diagram Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000001953 recrystallisation Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Description
本発明は、形状が良好な厚鋼板の製造方法および圧延のパススケジュール設定方法に関する。 The present invention relates to a method for manufacturing a thick steel plate having a good shape and a method for setting a rolling pass schedule.
近年、厚鋼板には、優れた強度および靭性の両立を求められる。優れた強度および靭性を両立した厚鋼板を得るには、鋼板組織の結晶粒微細化を行うことが最も有効とされており、その要求を満たす方法の一例として、圧延材に制御圧延を施す方法が挙げられる。制御圧延とは、１０００℃以上に加熱したスラブを所定の温度で所定の板厚まで再結晶温度域で圧延した後、圧延材の温度が未再結晶温度域またはその温度域に近い温度域にある状態で仕上板厚まで圧延を行う圧延方法である。優れた強度を維持しつつ靭性の向上を図るためには、圧延における、圧延温度、圧延機での圧下率およびパス数を適切に制御することが有効とされる。一般に、制御圧延を開始する温度は、主として圧延材の成分により決まる（例えば、非特許文献１を参照）。圧延温度は、製品の材質に影響する。また、制御圧延における圧下率、パス数などの圧延条件は、製品毎に決まる。圧延条件は、製品の材質および形状に影響する。一般的に制御圧延を開始する板厚は製品厚の１．４〜２．０倍以上あれば良いとされており、製品厚毎に決まっている。 In recent years, steel plates are required to have both excellent strength and toughness. In order to obtain a thick steel plate having both excellent strength and toughness, it is most effective to refine the crystal grains of the steel plate structure. Is mentioned. Controlled rolling means that after rolling a slab heated to 1000 ° C. or higher to a predetermined thickness at a predetermined temperature in a recrystallization temperature range, the temperature of the rolled material is in a non-recrystallization temperature range or a temperature range close to the temperature range. This is a rolling method in which rolling is performed to a finished plate thickness in a certain state. In order to improve toughness while maintaining excellent strength, it is effective to appropriately control the rolling temperature, rolling reduction in a rolling mill, and the number of passes in rolling. Generally, the temperature at which controlled rolling is started is mainly determined by the components of the rolled material (for example, see Non-Patent Document 1). The rolling temperature affects the quality of the product. The rolling conditions such as the rolling reduction and the number of passes in the controlled rolling are determined for each product. Rolling conditions affect the material and shape of the product. Generally, it is considered that the sheet thickness at which the controlled rolling is started should be at least 1.4 to 2.0 times the product thickness, and is determined for each product thickness.
上述の圧延温度および圧延条件の制御は、パススケジュールに基づき行われる。パススケジュールとは、圧延のパス配分を決めたものである。制御圧延材では、所定の制御圧延開始板厚および制御圧延開始温度から制御圧延を開始するため、圧延の途中や制御圧延の開始直前に、水冷や空冷等の冷却により制御圧延材の温度を調整する時間を設ける場合がある。この温度調整は未再結晶温度域よりも高い温度で行われるため、圧延による加工歪は減少してしまう。一般的に制御圧延開始板厚に対しては、この加工歪減少による影響は小さい。しかし、冷却を設けていない同じ条件（板厚、板幅および制御圧延開始温度）の制御圧延材と比較すると、冷却後の制御圧延材では、冷却後の圧延に必要な荷重が異なる。このため、パススケジュール通りに制御圧延を行っても目的とする材質、形状を得られない問題がある。加工歪減少を解消するためには、冷却後の適切な荷重予測をできればよいが難しい。実生産では、目的とする材質および適切な形状を確保する為に、パススケジュールのパス数に数パス（例えば４パス）を追加して、上述の問題を解消している。しかし、このような圧延は高荷重圧延のため、パス数の追加により形状不良を招く。そのため、歪不良がなく、形状の良好な厚鋼板の提供を要望されている。また、パス数追加により仕上圧延完了時点での制御圧延材の温度が設定した仕上温度よりも下回るため、目標の材質を得られない問題もあり、この問題の解消も求められている。 The control of the rolling temperature and the rolling conditions described above is performed based on a pass schedule. The pass schedule is determined by determining the distribution of rolling passes. In the control rolled material, the temperature of the control rolled material is adjusted by cooling such as water cooling or air cooling during the rolling or immediately before the start of the controlled rolling, in order to start the controlled rolling from the predetermined controlled rolling start thickness and the controlled rolling start temperature. In some cases. Since this temperature adjustment is performed at a temperature higher than the non-recrystallization temperature range, the processing distortion due to rolling is reduced. Generally, the influence of the reduction in the processing strain is small on the controlled rolling start plate thickness. However, when compared with a control rolled material under the same conditions (sheet thickness, plate width, and controlled rolling start temperature) where cooling is not provided, the load required for rolling after cooling is different in the control rolled material after cooling. For this reason, there is a problem that the target material and shape cannot be obtained even if the controlled rolling is performed according to the pass schedule. In order to eliminate the reduction of the processing strain, it is sufficient if an appropriate load can be predicted after cooling, but it is difficult. In actual production, in order to secure a target material and an appropriate shape, several passes (for example, four passes) are added to the number of passes in the pass schedule to solve the above-described problem. However, since such rolling is a high-load rolling, a shape defect is caused by adding the number of passes. Therefore, there is a demand for providing a thick steel plate having a good shape without distortion defects. In addition, since the temperature of the control rolled material at the time of completion of the finish rolling is lower than the set finishing temperature due to the addition of the number of passes, there is a problem that a target material cannot be obtained.
特許文献１には、冷却時間予測を正確に行うパススケジュール設定方法の技術を開示している。特許文献２には、圧下率を調整することにより、形状良好な鋼板を提供する製造方法の技術を開示している。 Patent Literature 1 discloses a technique of a pass schedule setting method for accurately predicting a cooling time. Patent Document 2 discloses a technique of a manufacturing method for providing a steel sheet having a good shape by adjusting a draft.
従来、一般的に、制御圧延では制御圧延開始温度と仕上温度に着目していたため、板幅と板厚の関係に着目していなかった。 Conventionally, in general, in control rolling, attention has been paid to the control rolling start temperature and the finishing temperature, and therefore, attention has not been paid to the relationship between the sheet width and the sheet thickness.
また、従来のパス数を追加する方法では、高荷重圧延の増加による形状不良の問題がある。パス数が増加すれば鋼板温度が低下するため、材質にも影響する。 In addition, the conventional method of increasing the number of passes has a problem of a defective shape due to an increase in high load rolling. If the number of passes increases, the temperature of the steel sheet decreases, which also affects the material.
特許文献１に記載の技術では、冷却や圧延の時間予測を正確に行うため、圧延能率は改善されるが、冷却後の加工歪減少や高荷重圧延による形状不良が改善されるかは不明である。特許文献２に記載の技術では、通常よりも高荷重の圧延を行うため、形状不良改善の向上に繋がるかは不明である。 According to the technology described in Patent Document 1, although the cooling and rolling time are accurately predicted, the rolling efficiency is improved, but it is not clear whether the deformation after cooling or the shape defect due to high load rolling is improved. is there. According to the technique described in Patent Document 2, rolling with a higher load than usual is performed, and it is not clear whether this leads to improvement in shape defect improvement.
本発明は、かかる事情に鑑みてなされたものであって、形状の良好な厚鋼板の製造方法および圧延のパススケジュール設定方法を提供することを目的とする。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method of manufacturing a thick steel plate having a good shape and a method of setting a rolling pass schedule.
本発明者らは上記課題を解決するため、鋭意研究を重ねた結果、次のことを見出した。 The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, have found the following.
従来、成分組成および仕上板厚を同じとする制御圧延材の場合には、圧延材の圧延幅に関わらず、制御圧延開始板厚および制御圧延開始温度を同一に設定したパススケジュールが作成される。しかし、実操業では、圧延を行う際、圧延材の温度、板厚、成分および規格だけでなく、圧延幅も考慮してパススケジュールを決定している。すなわち、制御圧延開始板厚、制御圧延開始温度、仕上板厚が等しい場合、圧延幅が狭ければ仕上板厚までのパス数は少なくなるが、圧延幅が広ければ仕上板厚までのパス数は多くなる。また、シングルスタンドにおいて、制御圧延時に適切な形状を確保するために必要なパス数（以下、適正パス数と称する場合もある）は、仕上板厚までに５パス以上のパス数を確保することが有効とされている。これは、形状制御がオペレータによる介入によって成立しているため、圧延機の前面、後面のどちらで温度調整を行った場合でも、前面にあるオペレータの監視室で、圧延中の形状を確認するパスを、制御圧延開始板厚のパスを除いて、２パス以上要するためである。そこで、本発明では、圧延材の圧延幅によって制御圧延開始板厚を変化させることで、制御圧延開始板厚から仕上板厚までのパス数を適正パス数以上に保つことができることを見出した。 Conventionally, in the case of a controlled rolled material having the same component composition and finished plate thickness, a pass schedule is created in which the controlled rolling start plate thickness and the controlled rolling start temperature are set to be the same, regardless of the rolling width of the rolled material. . However, in the actual operation, when rolling is performed, the pass schedule is determined in consideration of not only the temperature, the thickness, the composition, and the specification of the rolled material, but also the rolling width. In other words, when the controlled rolling start thickness, the controlled rolling start temperature, and the finished plate thickness are equal, the number of passes to the finished plate thickness decreases when the rolling width is small, but the number of passes to the finished plate thickness when the rolling width is large. Will increase. In a single stand, the number of passes required to secure an appropriate shape at the time of controlled rolling (hereinafter, sometimes referred to as an appropriate number of passes) is to secure at least 5 passes by the finished plate thickness. Is valid. This is because the shape control is achieved by the intervention of the operator, so that regardless of whether the temperature is adjusted on the front or rear side of the rolling mill, the operator can check the shape during rolling in the operator's monitoring room on the front. This is because two or more passes are required except for the pass of the controlled rolling start plate thickness. Therefore, in the present invention, it has been found that the number of passes from the controlled rolling start thickness to the finished plate thickness can be maintained at an appropriate number or more by changing the controlled rolling start thickness according to the rolling width of the rolled material.
本発明は、以上の知見に基づき完成されたものであり、その要旨は以下の通りである。
［１］加熱したスラブを、圧延機により１パス以上の圧延を行って所定の制御圧延開始板厚の制御圧延材とした後、前記制御圧延材を冷却設備により所定の制御圧延開始温度まで冷却し、さらに圧延機により１パス以上の制御圧延を行って仕上板厚とする厚鋼板の製造方法であって、前記制御圧延材の圧延幅に従って前記制御圧延開始板厚を変更することを特徴とする厚鋼板の製造方法。
［２］加熱したスラブを、圧延機により１パス以上の圧延を行って所定の制御圧延開始板厚の制御圧延材とした後、前記制御圧延材を冷却設備により所定の制御圧延開始温度まで冷却し、さらに圧延機により１パス以上の制御圧延を行って仕上板厚にするための圧延のパススケジュール設定方法であって、制御圧延材の情報を設定する対象材設定ステップと、前記制御圧延材の情報から制御圧延条件を設定してパススケジュールを作成するパススケジュール作成ステップと、前記パススケジュールを確定するパススケジュール設定ステップとを含み、前記パススケジュール作成ステップにより、前記制御圧延材の圧延幅に従って前記制御圧延開始板厚を変更することを特徴とする圧延のパススケジュール設定方法。
［３］前記制御圧延開始板厚の変更は、以下（１）〜（３）の条件を満足するように変更されることを特徴とする［２］に記載の圧延のパススケジュール設定方法。
（１）上位命令の制御圧延開始板厚以上であること
（２）形状制御開始板厚以上であること
（３）制御圧延開始板厚から仕上板厚までのパス数が、予め設定した適正パス数以上であること
［４］さらに、前記制御圧延開始板厚の変更は、以下（４）の条件を満足するように変更されることを特徴とする［３］に記載の圧延のパススケジュール設定方法。
（４）上限の制御圧延開始板厚以内であること
The present invention has been completed based on the above findings, and the gist is as follows.
[1] The heated slab is rolled by a rolling mill for one or more passes to obtain a control rolled material having a predetermined control rolling start plate thickness, and then the control rolled material is cooled to a predetermined control rolling start temperature by cooling equipment. And a method for producing a thick steel plate having a finished plate thickness by performing controlled rolling of one or more passes by a rolling mill, wherein the controlled rolling start plate thickness is changed according to a rolling width of the controlled rolled material. Manufacturing method of thick steel plate.
[2] The heated slab is subjected to one or more passes of rolling by a rolling mill to obtain a controlled rolled material having a predetermined control rolling start plate thickness, and then cooled to a predetermined control rolling start temperature by a cooling facility. A rolling pass schedule setting method for performing a controlled rolling of one or more passes by a rolling mill to obtain a finished plate thickness, wherein a target material setting step of setting information on a controlled rolling material; A pass schedule creating step of creating a pass schedule by setting the control rolling conditions from the information of, including a pass schedule setting step of determining the pass schedule, wherein the pass schedule creating step, according to the rolling width of the control rolled material A rolling pass schedule setting method, wherein the control rolling start plate thickness is changed.
[3] The rolling pass schedule setting method according to [2], wherein the change of the controlled rolling start sheet thickness is changed so as to satisfy the following conditions (1) to (3).
(1) The thickness is equal to or more than the control rolling start thickness of the upper command. (2) The shape control is equal to or greater than the thickness. (3) The number of passes from the control rolling start thickness to the finish thickness is a predetermined appropriate pass. [4] The rolling pass schedule setting according to [3], wherein the control rolling start sheet thickness is changed so as to satisfy the following condition (4). Method.
(4) Within the upper limit of control rolling start sheet thickness
本発明によれば、制御圧延材の圧延幅により制御圧延開始板厚を変化させ、さらに、制御圧延開始板厚から仕上板厚までのパス数を適正パス数以上に保つことにより、形状が良好な厚鋼板が得られる。また、本発明により得られる鋼板は、形状不良による不良品を防止し、歩留まりを向上できる。なお、本発明における形状が良好とは、歪が小さいことをいう。 According to the present invention, the control rolling start plate thickness is changed by the rolling width of the control rolled material, and further, the number of passes from the control rolling start plate thickness to the finished plate thickness is maintained at an appropriate number of passes or more, so that the shape is good. A thick steel plate can be obtained. Further, the steel sheet obtained by the present invention can prevent defective products due to defective shape and can improve the yield. In addition, good shape in the present invention means that distortion is small.
以下、本発明の一実施形態について説明する。なお、本発明は以下の実施形態に限定されない。 Hereinafter, an embodiment of the present invention will be described. Note that the present invention is not limited to the following embodiments.
まず、本発明の基本的な技術思想について説明する。 First, a basic technical idea of the present invention will be described.
制御圧延開始板厚を厚くすることについては、材質上の問題点は少ないとされている。本発明者らは、板厚と、強度および靭性との関係を鋭意調査し、その結果を図１、２に示す。図１は、制御圧延開始板厚と仕上板厚の比に対する、降伏強度および引張強度（以下、強度と称する）の関係を示すものである。図１より、強度は、この範囲（制御圧延開始板厚と仕上板厚の比が、約２．０〜３．２の範囲）では制御開始板厚に依存していないことが分かる。図２は、制御圧延開始板厚と仕上板厚の比に対する、０℃におけるシャルピー吸収エネルギー（以下、ｖＥ０℃と称する。）の関係を示すものである。図２より、ｖＥ０℃では制御圧延開始板厚に対する依存が小さいことが分かる。以上より、制御圧延開始板厚を厚くまたは薄く変化させても、ある範囲では、製品の強度およびｖＥ０℃に影響を与えないことを見出した。 It is said that there is little problem in terms of material regarding increasing the thickness of the controlled rolling start plate. The present inventors have intensively investigated the relationship between the plate thickness and the strength and toughness, and the results are shown in FIGS. FIG. 1 shows the relationship between the yield strength and the tensile strength (hereinafter referred to as strength) with respect to the ratio between the controlled rolling start sheet thickness and the finished sheet thickness. From FIG. 1, it can be seen that the strength is not dependent on the control start plate thickness in this range (the ratio of the controlled rolling start plate thickness to the finished plate thickness is in the range of about 2.0 to 3.2). FIG. 2 shows the relationship between the Charpy absorbed energy at 0 ° C. (hereinafter referred to as vE0 ° C.) and the ratio of the controlled rolling start sheet thickness to the finished sheet thickness. FIG. 2 shows that at vE0 ° C., the dependence on the controlled rolling start sheet thickness is small. From the above, it has been found that even if the thickness of the controlled rolling start plate is changed to be large or small, the strength of the product and vE0 ° C. are not affected within a certain range.
また、本発明者らは、制御圧延開始板厚から仕上板厚までのパス数（以下、制御圧延パス数と称する）、制御圧延開始板厚、および圧延幅の関係が図３のようになっていることを見出した。図３は、仕上板厚を８ｍｍとした場合の圧延幅（ｍ）に対する制御圧延パス数と制御圧延開始板厚との関係を示すものである。なお、ここでは、制御圧延パス数：５を適正パス数として予め設定した。 Further, the present inventors have shown the relationship between the number of passes from the controlled rolling start sheet thickness to the finished sheet thickness (hereinafter, referred to as the controlled rolling pass number), the controlled rolling start sheet thickness, and the rolling width as shown in FIG. I found that. FIG. 3 shows the relationship between the controlled rolling pass number and the controlled rolling start plate thickness with respect to the rolling width (m) when the finished plate thickness is 8 mm. Here, the number of control rolling passes: 5 was set in advance as an appropriate number of passes.
従来は、上述のように、パススケジュールの作成に際し、制御圧延開始温度および制御圧延開始板厚は、圧延材の圧延幅によらず決定されていた。そのため、図３に示すように、例えば、仕上板厚：８ｍｍ、制御圧延開始板厚：１６ｍｍとした場合、圧延幅：２．５ｍ以上５．５ｍ以下の圧延材では、制御圧延パス数は適正パス数以上となるが、圧延幅：２．５ｍ未満の圧延材では、制御圧延パス数は適正パス数未満となる。この場合、圧延幅２．５ｍ未満の圧延材では、制御圧延開始板厚が厚くなるように変更すれば、適正パスの確保が可能となることがわかる。 Conventionally, as described above, at the time of creating the pass schedule, the controlled rolling start temperature and the controlled rolling start sheet thickness are determined regardless of the rolling width of the rolled material. Therefore, as shown in FIG. 3, for example, when the finished sheet thickness is 8 mm and the controlled rolling start sheet thickness is 16 mm, the number of controlled rolling passes is appropriate for a rolled material having a rolling width of 2.5 m or more and 5.5 m or less. Although the number of passes is equal to or greater than the number of passes, the rolled material having a rolling width of less than 2.5 m has a controlled number of rolling passes less than the appropriate number of passes. In this case, it can be seen that if the rolled material having a rolling width of less than 2.5 m is changed so that the control rolling start plate thickness is increased, it is possible to secure an appropriate pass.
以上より、本発明では、制御圧延材の圧延幅により制御圧延開始板厚を変更させることで、制御圧延パス数を適正パス数以上に保つことができることを見出した。 As described above, in the present invention, it has been found that the number of controlled rolling passes can be maintained at an appropriate number or more by changing the controlled rolling start plate thickness according to the rolling width of the controlled rolled material.
次に、本発明の厚鋼板の製造方法について説明する。 Next, a method for manufacturing a steel plate according to the present invention will be described.
本発明は、加熱したスラブを、圧延機により１パス以上の圧延を行って所定の制御圧延開始板厚の制御圧延材とした後、制御圧延材を冷却設備により所定の制御圧延開始温度まで冷却し、さらに圧延機により１パス以上の制御圧延を行って仕上板厚とする厚鋼板の製造方法であって、制御圧延材の圧延幅に従って制御圧延開始板厚を変更し、制御圧延開始板厚から仕上板厚までのパス数を適正パス数以上にするように制御圧延のパススケジュールを設定する。 According to the present invention, the heated slab is subjected to one or more passes of rolling by a rolling mill to obtain a control rolled material having a predetermined control rolling start plate thickness, and then the control rolled material is cooled to a predetermined control rolling start temperature by a cooling facility. A method for producing a thick steel sheet having a finished thickness by performing one or more passes of controlled rolling by a rolling mill, wherein the controlled rolling start thickness is changed according to the rolling width of the controlled rolled material. The pass schedule of controlled rolling is set so that the number of passes from to the finished plate thickness is equal to or more than the appropriate number of passes.
本発明の厚鋼板を製造する装置は、熱間圧延ライン上に粗圧延機と仕上圧延機との２機の可逆式圧延機と、これら圧延機の中間に圧延材（厚鋼板）を冷却する冷却装置を備える。さらに、本発明の厚鋼板を製造する装置は、これら全体を制御するプロセスコンピュータを備える。プロセスコンピュータは、後述の図４、５で説明するパススケジュール設定の処理を行う装置の制御も行う。 The apparatus for manufacturing a steel plate according to the present invention comprises two reversible rolling mills, a rough rolling mill and a finishing rolling mill, on a hot rolling line, and cools a rolled material (steel plate) between these rolling mills. Equipped with a cooling device. Further, the apparatus for manufacturing a thick steel plate according to the present invention includes a process computer for controlling the entirety. The process computer also controls a device that performs a process of setting a path schedule described later with reference to FIGS.
厚鋼板を製造する装置は、例えば、厚さ２００〜３００ｍｍのスラブを１１００〜１２００℃程度まで加熱後、所定の制御圧延開始板厚まで圧延（粗圧延）し、その後、未再結晶温度域である８５０℃以下の所定の制御圧延開始温度まで冷却し、制御圧延開始温度になった時点で仕上板厚（例えば、８ｍｍ）まで圧延（仕上圧延）を行うものである。この圧延工程における温度および圧延条件などの制御は、パススケジュールに基づき行われる。パススケジュールは、前述の制御が行われる前に、後述の図５に示す処理を行うことにより設定される。パススケジュール設定の処理は、後述の図４に示す処理部により実行される。 An apparatus for manufacturing a thick steel plate, for example, heats a slab having a thickness of 200 to 300 mm to about 1100 to 1200 ° C., rolls it to a predetermined control rolling start sheet thickness (rough rolling), and then, in a non-recrystallization temperature range. It is cooled to a predetermined control rolling start temperature of 850 ° C. or lower, and when the control rolling start temperature is reached, rolling (finish rolling) is performed to a finished plate thickness (for example, 8 mm). Control of the temperature, rolling conditions, and the like in the rolling process is performed based on a pass schedule. The path schedule is set by performing a process shown in FIG. 5 described later before the above-described control is performed. The processing of the path schedule setting is executed by a processing unit shown in FIG.
次に、本発明の圧延のパススケジュール設定の処理を行う装置について説明する。図４は、パススケジュール設定装置の構成例を説明するブロック図である。 Next, an apparatus for performing a rolling pass schedule setting process of the present invention will be described. FIG. 4 is a block diagram illustrating a configuration example of a path schedule setting device.
本発明の圧延のパススケジュールを設定する装置は、例えばビジネスコンピュータやプロセスコンピュータを用いて、対象材を選択し、制御圧延材の圧延幅に応じて制御圧延開始板厚を変更し、さらに制御圧延パス数が適正パス数以上である制御圧延材のパススケジュール作成などを行う。図４に示すように、上述の装置は少なくとも入力部１、出力部２、処理部３、記憶部４から構成される。 The apparatus for setting a rolling pass schedule according to the present invention uses, for example, a business computer or a process computer to select a target material, change the control rolling start sheet thickness according to the rolling width of the control rolling material, and further perform the control rolling. A pass schedule is created for a controlled rolled material whose number of passes is equal to or greater than the appropriate number of passes. As shown in FIG. 4, the above-described device includes at least an input unit 1, an output unit 2, a processing unit 3, and a storage unit 4.
入力部１は、例えばキーボードなどの入力装置であり、仕上温度や仕上板厚などの対象材を選択するための情報が入力される。入力された情報は処理部３へ出力される。出力部２は、例えばディスプレイなど表示装置であり、処理部３からの情報を表示する。記憶部４は、例えばハードディスク等の記録媒体や書き込み装置などであり、上述の装置の実行に必要なデータおよび各処理のデータが保存される。記憶部４は、少なくとも、対象材毎の制御圧延開始板厚、制御圧延開始温度および規格などの情報を保存する対象材データベース４１と、パススケジュールを都度一時的または確定データとして保存するパススケジュールデータベース４２を有する。処理部３は、例えばＣＰＵなどであり、入力部１から出力された対象材の情報をもとに、パススケジュールの作成、パススケジュールの設定などを行い、確定されたパススケジュールをもとに圧延設備の動作を制御する。処理部３は、対象材設定部３１、パススケジュール作成部３２、およびパススケジュール設定部３３を有する。 The input unit 1 is, for example, an input device such as a keyboard, and inputs information for selecting a target material such as a finishing temperature and a finished plate thickness. The input information is output to the processing unit 3. The output unit 2 is a display device such as a display, for example, and displays information from the processing unit 3. The storage unit 4 is, for example, a recording medium such as a hard disk or a writing device, and stores data necessary for execution of the above-described device and data of each process. The storage unit 4 includes at least a target material database 41 that stores information such as a controlled rolling start plate thickness, a controlled rolling start temperature, and a standard for each target material, and a pass schedule database that stores a pass schedule as temporary data or fixed data each time. 42. The processing unit 3 is, for example, a CPU or the like, and creates a pass schedule, sets a pass schedule, and the like based on the information on the target material output from the input unit 1, and performs rolling based on the determined pass schedule. Control the operation of equipment. The processing unit 3 includes a target material setting unit 31, a pass schedule creation unit 32, and a pass schedule setting unit 33.
本発明では、入力された仕上板厚および仕上温度などの情報を処理部３へ送り、処理部３を用いて後述するパススケジュール設定処理を行う。そして、処理部３を用いて設定されたパススケジュールに基づき、圧延設備の圧延機等を制御する。 In the present invention, the input information such as the finished plate thickness and the finished temperature is sent to the processing unit 3, and a pass schedule setting process described later is performed using the processing unit 3. Then, based on the pass schedule set by using the processing unit 3, a rolling mill or the like of the rolling equipment is controlled.
次に、本発明のパススケジュール設定方法について説明する。図５は圧延のパススケジュール設定処理の処理手順の一例を示すものである。 Next, the path schedule setting method of the present invention will be described. FIG. 5 shows an example of the processing procedure of the rolling pass schedule setting processing.
本発明のパススケジュール設定方法とは、加熱したスラブを、圧延機により１パス以上の圧延を行って所定の制御圧延開始板厚の制御圧延材とした後、制御圧延材を冷却設備により所定の制御圧延開始温度まで冷却し、さらに圧延機により１パス以上の制御圧延を行って仕上板厚にするためのパススケジュール設定方法であって、入力された仕上温度および仕上板厚のデータより対象材情報を設定し、前記仕上板厚および前記対象材情報のデータより上位命令の制御圧延開始板厚を算出し、前記仕上温度、前記仕上板厚、前記対象材情報、前記上位命令の制御圧延開始板厚のデータなどの制御圧延材の情報を後続の処理へ渡す対象材設定ステップと、前記制御圧延材の情報から上限の制御圧延開始板厚および形状制御圧延開始板厚を算出して制御圧延条件を設定し、前記制御圧延条件を用いて制御圧延開始板厚から仕上板厚までのパス数が予め設定した適正なパス数以上であるように、前記制御圧延材の圧延幅に従って制御圧延開始板厚を変更し、パススケジュールを作成するパススケジュール作成ステップと、前記パススケジュールを確定するパススケジュール設定ステップと、を含むものである。 With the pass schedule setting method of the present invention, the heated slab is subjected to one or more passes of rolling by a rolling mill to obtain a control rolled material having a predetermined control rolling start sheet thickness, and then the control rolled material is cooled to a predetermined thickness by cooling equipment. A pass schedule setting method for cooling to a controlled rolling start temperature and further performing one or more passes of controlled rolling by a rolling mill to obtain a finished plate thickness, wherein a target material is obtained from input finishing temperature and finished plate thickness data. Set the information, calculate the control rolling start sheet thickness of the higher order from the data of the finish sheet thickness and the target material information, and start the control rolling of the finishing temperature, the finish sheet thickness, the target material information, the higher order command. The target material setting step of passing information on the control rolled material such as sheet thickness data to subsequent processing, and calculating the upper limit control rolling start plate thickness and shape control rolling start plate thickness from the information on the control rolled material Control rolling conditions are set, and control is performed in accordance with the rolling width of the control rolled material so that the number of passes from the control rolling start sheet thickness to the finished sheet thickness is equal to or greater than an appropriate preset number of passes using the control rolling conditions. The method includes a pass schedule creating step of changing a rolling start sheet thickness and creating a pass schedule, and a pass schedule setting step of fixing the pass schedule.
先ず、対象材設定ステップ（ステップＳ１）が行われる。 First, a target material setting step (step S1) is performed.
ステップＳ１では、処理部３の対象材設定部３１が、入力部より入力された仕上温度および仕上板厚のデータを用いて対象材情報の設定を行う。続いて、仕上板厚と対象材情報のデータを用いて上位命令の制御圧延開始板厚を算出する。ここで、対象材情報とは、スラブ寸法、圧延幅などの圧延寸法、材質に関するデータなどである。対象材情報として、ビジネスコンピュータなどの上位システムから圧延に必要な情報のみが送られる。仕上板厚とは、仕上圧延終了時の板厚であり、例えば顧客からの依頼時に指定された数値である。仕上温度とは、仕上圧延終了時の鋼板表面の温度であり、例えば要求される材質により決まる数値である。上位命令の制御圧延開始板厚とは、上位システムから送られる制御圧延開始板厚であり、制御圧延開始板厚の下限を表す。 In step S1, the target material setting unit 31 of the processing unit 3 sets the target material information using the data of the finishing temperature and the finished plate thickness input from the input unit. Subsequently, the control rolling start sheet thickness of the higher order is calculated using the data of the finished sheet thickness and the target material information. Here, the target material information is data related to rolling dimensions such as slab dimensions and rolling widths, and materials. As target material information, only information necessary for rolling is sent from a host system such as a business computer. The finish plate thickness is a plate thickness at the end of finish rolling, for example, a numerical value specified at the time of a request from a customer. The finishing temperature is the temperature of the steel sheet surface at the time of finishing rolling and is a numerical value determined by, for example, a required material. The control rolling start sheet thickness of the upper command is the control rolling start sheet thickness sent from the host system, and represents the lower limit of the control rolling start sheet thickness.
そして、仕上温度、仕上板厚、対象材情報、上位命令の制御圧延開始板厚などの各データが、後続の処理へ渡される。 Then, the respective data such as the finishing temperature, the finished plate thickness, the target material information, and the controlled rolling start plate thickness of the higher order are passed to the subsequent processing.
次いで、パススケジュール作成ステップ（ステップＳ２）が行われる。 Next, a pass schedule creation step (step S2) is performed.
まず、ステップＳ２では、パススケジュール作成部３２が、仕上板厚を用いて、制御圧延開始板厚の上限（以下、上限の制御圧延開始板厚と称する）を算出する。また、仕上板厚および対象材情報の圧延幅を用いて、形状制御圧延開始板厚を算出する。形状制御圧延開始板厚は、板厚が厚いほど、もしくは板幅が狭いほど形状制御開始板厚と仕上板厚との差を小さく設定される。そして、制御圧延条件の設定を行う。ここで、形状制御開始板厚とは、板クラウンの変化が形状に現れ始める板厚のことである。制御圧延条件とは、例えば、上位命令の制御圧延開始板厚、上限の制御圧延開始板厚、形状制御開始板厚、制御圧延開始温度、パス数、各パスの圧延温度および各パスの圧下率、仕上板厚、仕上温度などのパススケジュール作成に必要となるデータである。また、制御圧延条件には適正パス数を含む。適正パス数とは、制御圧延材が適切な形状を確保するために必要なパス数であり、制御圧延開始板厚から仕上板厚までのパス数をいう。例えば、適正パス数は、製品の仕上板厚毎に予め設定し、データベースに記憶しておいてもよく、ここではＺパス（固定値）として設定される。 First, in step S2, the pass schedule creation unit 32 calculates the upper limit of the controlled rolling start sheet thickness (hereinafter, referred to as the upper limit controlled rolling start sheet thickness) using the finished sheet thickness. The shape control rolling start sheet thickness is calculated using the finished sheet thickness and the rolling width of the target material information. The shape control rolling start sheet thickness is set so that the difference between the shape control start sheet thickness and the finished sheet thickness becomes smaller as the sheet thickness becomes thicker or as the sheet width becomes narrower. Then, control rolling conditions are set. Here, the shape control start plate thickness is a plate thickness at which a change in the plate crown starts to appear in the shape. The controlled rolling conditions include, for example, the controlled rolling start thickness of the upper command, the upper limit controlled rolling start thickness, the shape control starting thickness, the controlled rolling start temperature, the number of passes, the rolling temperature of each pass, and the rolling reduction of each pass. , Data required for creating a pass schedule such as a finished plate thickness and a finished temperature. In addition, the controlled rolling conditions include an appropriate number of passes. The appropriate number of passes is the number of passes required for the control rolled material to secure an appropriate shape, and refers to the number of passes from the control rolling start sheet thickness to the finished sheet thickness. For example, the appropriate number of passes may be set in advance for each finished plate thickness of the product and stored in a database, and is set here as a Z pass (fixed value).
続いて、パススケジュール作成部３２が、上述の制御圧延条件のデータを用いて、パススケジュールの制御圧延開始板厚、各パスの圧延温度および圧下率などを算出する。その後、算出結果に基づきパススケジュールの作成を行う。なお、作成されるパススケジュールは、パススケジュールデータベースに都度一時的に保存されるようにしてもよい。本発明では、パススケジュールの制御圧延開始板厚の算出に際し、次の条件を満足することを特徴とする。以下に、各条件とその限定理由について説明する。 Subsequently, the pass schedule creating unit 32 calculates the controlled rolling start sheet thickness of the pass schedule, the rolling temperature and the rolling reduction of each pass, etc., using the data of the controlled rolling conditions described above. Thereafter, a path schedule is created based on the calculation result. Note that the created pass schedule may be temporarily stored in the pass schedule database each time. The present invention is characterized in that the following conditions are satisfied when calculating the control rolling start sheet thickness of the pass schedule. Hereinafter, each condition and the reason for the limitation will be described.
（１）パススケジュールの制御圧延開始板厚が、上位命令の制御圧延開始板厚以上であること
パススケジュールの制御圧延開始板厚が、上位命令の制御圧延開始板厚（制御圧延開始板厚の下限）未満の場合、必要とされる材質を確保できない可能性がある。よって、上位命令の制御圧延開始板厚以上とする。
(1) The control rolling start thickness in the pass schedule is equal to or greater than the control rolling start thickness in the upper order.
If the controlled rolling start sheet thickness of the pass schedule is less than the controlled rolling starting sheet thickness of the higher order (the lower limit of the controlled rolling starting sheet thickness), the required material may not be able to be secured. Therefore, it is set to be equal to or more than the control rolling start sheet thickness of the upper order.
（２）パススケジュールの制御圧延開始板厚が、形状制御開始板厚より厚いこと
パススケジュールの制御圧延開始板厚が、形状制御開始板厚以下になる場合、板クラウンの変化が形状に出る恐れがある。特に、制御圧延の場合、温度調整時間中に加工歪が解放されて形状制御が難しくなるため、板クラウンの変化が予測と大きく外れるパスを回避する必要がある。よって、形状制御開始板厚より厚いこととする。
(2) The control rolling start sheet thickness of the pass schedule is thicker than the shape control starting sheet thickness. When the control rolling start sheet thickness of the pass schedule is equal to or less than the shape control starting sheet thickness, a change in the sheet crown may appear in the shape. There is. In particular, in the case of the controlled rolling, since the processing strain is released during the temperature adjustment time and the shape control becomes difficult, it is necessary to avoid a path in which the change in the sheet crown deviates greatly from the prediction. Therefore, the thickness is set to be larger than the shape control start plate thickness.
（３）パススケジュールの制御圧延開始板厚から仕上板厚までのパス数（制御圧延パス数）が、予め設定した適正パス数（Ｚパス）以上であること
制御圧延パス数が、適正パス数未満の場合、制御圧延材の目的とする材質や形状を得られない恐れがある。この場合、制御圧延材の圧延幅に従って制御圧延開始板厚を変更し、さらに変更後の制御圧延開始板厚から仕上板厚までの制御圧延パス数が適正パス数以上であるように調整する必要がある。例えば、制御圧延パス数が適正パス数を下回る場合、適正パス数を確保するために、制御圧延開始板厚の上限あるいは下限を用いて、パススケジュールの制御圧延開始板厚を変更する。
(3) Control of pass schedule The number of passes from the rolling start plate thickness to the finished plate thickness (control rolling pass number) is equal to or greater than a preset proper pass number (Z pass). If it is less than the desired value, the desired material and shape of the controlled rolled material may not be obtained. In this case, it is necessary to change the control rolling start thickness in accordance with the rolling width of the control rolled material, and further adjust the control rolling pass number from the changed control rolling start thickness to the finished plate thickness to be equal to or more than the appropriate number of passes. There is. For example, when the number of controlled rolling passes is less than the appropriate number of passes, the controlled rolling starting thickness of the pass schedule is changed using the upper or lower limit of the controlled rolling starting thickness to secure the appropriate number of passes.
（４）パススケジュールの制御圧延開始板厚が、上限の制御圧延開始板厚以内であること
パススケジュールの制御圧延開始板厚が、設定した上限の制御圧延開始板厚を超える場合、パス数をむやみに増やす恐れがある。よって、パス数増加を防止するため、上限の制御圧延開始板厚以内とするとよい。
(4) The control rolling start sheet thickness of the pass schedule is within the upper limit control rolling start sheet thickness. When the control rolling start sheet thickness of the pass schedule exceeds the set upper limit control rolling start sheet thickness, the number of passes is reduced. There is a possibility that it will increase unnecessarily. Therefore, in order to prevent an increase in the number of passes, it is preferable that the thickness be within the upper limit of the controlled rolling start sheet thickness.
本発明では、上記（１）〜（３）の条件を満足する制御圧延開始板厚を用いてパススケジュールを作成すれば、上記した本発明の効果を得られる。さらに上記（４）の条件を満足することにより、パス数をむやみに増やすことの防止につながり、生産コストの面でもより有利な効果を得られる。 In the present invention, the above-described effects of the present invention can be obtained by creating a pass schedule using a controlled rolling start sheet thickness that satisfies the above conditions (1) to (3). Further, by satisfying the condition (4), it is possible to prevent the number of passes from being increased unnecessarily, and to obtain a more advantageous effect in terms of production cost.
次いで、パススケジュール設定ステップ（ステップＳ３）が行われる。 Next, a pass schedule setting step (step S3) is performed.
ステップＳ３では、パススケジュール設定部３３が、処理部３により作成されたパススケジュールの確定し、設定する処理を行う。なお、図示はしないが、確定されたパススケジュールは、パススケジュールデータベースに保存してもよい。そして、処理部により、確定されたパススケジュールを用いて、圧延設備の圧延機等の制御が行われる。 In step S3, the path schedule setting unit 33 determines and sets the path schedule created by the processing unit 3. Although not shown, the determined pass schedule may be stored in a pass schedule database. The processing unit controls the rolling mill and the like of the rolling equipment using the determined pass schedule.
以下、本発明を実施例により説明する。なお、本発明は以下の実施例に限定されない。 Hereinafter, the present invention will be described with reference to examples. Note that the present invention is not limited to the following embodiments.
発明例として、図５の圧延のパススケジュール設定処理に従い、圧延幅により上位命令の制御圧延開始板厚を変更し、さらに制御圧延パス数が適正パス数の範囲になるようにパススケジュールを作成した。このパススケジュールを用い、制御圧延材の制御圧延を行った。一方、比較例として、圧延幅により制御圧延開始板厚を変更せずにパススケジュールを作成した。このパススケジュールを用い、制御圧延材の制御圧延を行った。 As an example of the invention, according to the rolling pass schedule setting process of FIG. 5, the control rolling start plate thickness of the higher order was changed according to the rolling width, and a pass schedule was created so that the number of controlled rolling passes was within the range of an appropriate number of passes. . Control rolling of the control rolled material was performed using this pass schedule. On the other hand, as a comparative example, a pass schedule was created without changing the control rolling start sheet thickness depending on the rolling width. Control rolling of the control rolled material was performed using this pass schedule.
例えば、制御圧延材は、圧延幅４０００ｍｍ、仕上板厚１２ｍｍである。比較例のパススケジュールは、仕上板厚に対して制御圧延開始板厚を３.０倍の厚みとして作成した。一方、発明例のパススケジュールは、仕上板厚に対して制御圧延開始板厚を２．５倍に変更し、さらに制御圧延パス数が適正パス数の範囲となるように作成した。 For example, the control rolled material has a rolling width of 4000 mm and a finished plate thickness of 12 mm. In the pass schedule of the comparative example, the controlled rolling start sheet thickness was 3.0 times the finished sheet thickness. On the other hand, the pass schedule of the invention example was prepared such that the controlled rolling start sheet thickness was changed to 2.5 times the finished sheet thickness, and the number of controlled rolling passes was within the range of the appropriate number of passes.
図６に、発明例と比較例における、歪および寸法不良による不合格率変化を示す。図６に示すように、制御圧延開始板厚を圧延幅により変更させることで、寸法や歪不合格率が改善されていることが分かる。寸法や歪不合格率は、比較例が１２．４％であり、発明例が１０．８％であることから、１．６％歩留が向上した。 FIG. 6 shows the rejection rate changes due to distortion and dimensional defects in the inventive example and the comparative example. As shown in FIG. 6, it can be seen that the dimensions and the strain rejection rate are improved by changing the control rolling start plate thickness according to the rolling width. The dimensions and strain rejection rate were 12.4% in the comparative example and 10.8% in the invention example, so that the yield was improved by 1.6%.
１ 入力部
２ 出力部
３ 処理部
４ 記憶部
３１ 対象材設定部
３２ パススケジュール作成部
３３ パススケジュール設定部
４１ 対象材データベース
４２ パススケジュールデータベース
DESCRIPTION OF SYMBOLS 1 Input part 2 Output part 3 Processing part 4 Storage part 31 Target material setting part 32 Pass schedule creation part 33 Pass schedule setting part 41 Target material database 42 Pass schedule database
Claims (2)
前記制御圧延のパススケジュールの作成に際し、
入力された仕上温度および仕上板厚のデータを用いて設定した対象材情報の圧延幅に対して、入力された仕上温度および仕上板厚のデータを用いて算出した制御圧延開始板厚となった時点の前記制御圧延材の圧延幅が広い材料では、前記制御圧延開始板厚を前記算出した制御圧延開始板厚に対して薄く変更し、
あるいは、前記対象材情報の圧延幅に対して、前記算出した制御圧延開始板厚となった時点の前記制御圧延材の圧延幅が狭い材料では、前記制御圧延開始板厚を前記算出した制御圧延開始板厚に対して厚く変更し、
次いで、変更された前記制御圧延開始板厚と入力された仕上板厚のデータを用いて、以下（１）〜（４）の条件を満足するように、前記制御圧延開始板厚から前記仕上板厚までのパス数を設定することを特徴とする厚鋼板の製造方法。
（１）変更された前記制御圧延開始板厚が、前記算出した制御圧延開始板厚以上であること
（２）変更された前記制御圧延開始板厚が、板クラウンの変化が形状に現れ始める形状制御開始板厚より厚いこと
（３）変更された前記制御圧延開始板厚から前記仕上板厚までのパス数が、予め設定した制御圧延材が適切な形状を確保するために必要なパス数以上であること
（４）変更された前記制御圧延開始板厚から前記仕上板厚までのパス数が、入力された仕上板厚のデータを用いて算出した上限の制御圧延開始板厚から前記仕上板厚までのパス数以内であること The heated slab is subjected to rolling of one or more passes by a rolling mill to obtain a control rolled material having a predetermined control rolling start plate thickness, and then cooling the control rolled material to a predetermined control rolling start temperature by cooling equipment, A method for producing a thick steel plate which is controlled by one or more passes by a rolling mill to obtain a finished plate thickness,
In creating the pass schedule of the control rolling,
For the rolling width of the target material information set using the input finishing temperature and finishing sheet thickness data, the control rolling start sheet thickness calculated using the input finishing temperature and finishing sheet thickness data was obtained. the material rolled wide of the controlled rolling material time, thin change the controlled rolling start thickness relative to controlled rolling start thickness that the calculated,
Alternatively, with respect to the rolling width of the target material information, for a material having a narrow rolling width of the control rolled material at the time when the calculated control rolling start thickness becomes the calculated control rolling thickness, the control rolling start thickness is calculated. Change thicker to the starting plate thickness,
Next, using the changed control rolling start sheet thickness and the input finished sheet thickness data, the control rolling start sheet thickness is reduced to the finished sheet so as to satisfy the following conditions (1) to (4). A method for manufacturing a thick steel plate, comprising setting the number of passes up to a thickness.
(1) The changed control rolling start thickness is equal to or greater than the calculated control rolling start thickness.
(2) The changed control rolling start plate thickness is larger than the shape control start plate thickness at which a change in the plate crown starts to appear in the shape.
(3) The number of passes from the changed controlled rolling start sheet thickness to the finished sheet thickness is equal to or greater than the number of passes required for a preset controlled rolling material to secure an appropriate shape.
(4) The number of passes from the changed controlled rolling start sheet thickness to the finished sheet thickness is from the upper limit controlled rolling starting sheet thickness to the finished sheet thickness calculated using the input finished sheet thickness data. Within the number of passes
制御圧延材の情報を設定する対象材設定ステップと、前記制御圧延材の情報から制御圧延条件を設定してパススケジュールを作成するパススケジュール作成ステップと、前記パススケジュールを確定するパススケジュール設定ステップとを含み、
前記パススケジュール作成ステップにより、
前記対象材設定ステップで入力された仕上温度および仕上板厚のデータを用いて設定した対象材情報の圧延幅に対して、該入力された仕上温度および仕上板厚のデータを用いて算出した制御圧延開始板厚となった時点の前記制御圧延材の圧延幅が広い材料では、前記制御圧延開始板厚を前記算出した制御圧延開始板厚に対して薄く変更し、
あるいは、前記対象材情報の圧延幅に対して、前記算出した制御圧延開始板厚となった時点の前記制御圧延材の圧延幅が狭い材料では、前記制御圧延開始板厚を前記算出した制御圧延開始板厚に対して厚く変更し、
次いで、変更された前記制御圧延開始板厚と入力された仕上板厚のデータを用いて、以下（１）〜（４）の条件を満足するように、前記制御圧延開始板厚から前記仕上板厚までのパス数を設定することを特徴とする圧延のパススケジュール設定方法。
（１）変更された前記制御圧延開始板厚が、前記対象材設定ステップで算出した制御圧延開始板厚以上であること
（２）変更された前記制御圧延開始板厚が、板クラウンの変化が形状に現れ始める形状制御開始板厚より厚いこと
（３）変更された前記制御圧延開始板厚から前記仕上板厚までのパス数が、前記パススケジュール作成ステップで予め設定した制御圧延材が適切な形状を確保するために必要なパス数以上であること
（４）変更された前記制御圧延開始板厚から前記仕上板厚までのパス数が、前記対象材設定ステップで入力された仕上板厚のデータを用いて前記パススケジュール作成ステップで算出した上限の制御圧延開始板厚から前記仕上板厚までのパス数以内であること The heated slab is subjected to rolling of one or more passes by a rolling mill to obtain a control rolled material having a predetermined control rolling start plate thickness, and then cooling the control rolled material to a predetermined control rolling start temperature by cooling equipment, A rolling pass schedule setting method for performing controlled rolling of one or more passes by a rolling mill to obtain a finished plate thickness,
A target material setting step of setting information on the control rolled material, a pass schedule creation step of setting a control rolling condition from the information of the control rolled material to create a pass schedule, and a pass schedule setting step of determining the pass schedule; Including
By the pass schedule creating step,
For the rolling width of the target material information set using the data of the finishing temperature and the finished plate thickness input in the target material setting step, the control calculated using the input data of the finished temperature and the finished plate thickness. the material rolled wide of the controlled rolling material at the time of a start rolling thickness, thin change the controlled rolling start thickness relative to controlled rolling start thickness that the calculated,
Alternatively, with respect to the rolling width of the target material information, for a material having a narrow rolling width of the control rolled material at the time when the calculated control rolling start thickness becomes the calculated control rolling thickness, the control rolling start thickness is calculated. Change thicker to the starting plate thickness,
Next, using the changed control rolling start sheet thickness and the input finished sheet thickness data, the control rolling start sheet thickness is reduced to the finished sheet so as to satisfy the following conditions (1) to (4). A rolling pass schedule setting method, wherein the number of passes up to the thickness is set.
(1) The changed control rolling start thickness is equal to or greater than the control rolling start thickness calculated in the target material setting step.
(2) The changed control rolling start plate thickness is larger than the shape control start plate thickness at which a change in the plate crown starts to appear in the shape.
(3) The number of passes from the changed controlled rolling start sheet thickness to the finished sheet thickness is equal to or greater than the number of passes required for the control rolled material set in advance in the pass schedule creating step to secure an appropriate shape. There is
(4) The number of passes from the changed control rolling start sheet thickness to the finished sheet thickness is the upper limit calculated in the pass schedule creating step using the finished sheet thickness data input in the target material setting step. Within the number of passes from the controlled rolling start thickness to the finish thickness
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