JP4349255B2 - Pass schedule setting method and thick steel plate manufacturing method - Google Patents
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Description
本発明は、厚鋼板の製造方法及びパススケジュールの設定方法に関する。本発明は、例えば、可逆式圧延機を用いた複数パスのリバース圧延を行ってＴＭＣＰにより厚鋼板を製造するに際し、途中のパスでの圧延温度の目標値及び最終仕上がり温度の目標値をいずれも満足しながら、圧延時間を大幅に短縮化することができる厚鋼板の製造方法及びパススケジュールの設定方法に関する。 The present invention relates to a method for manufacturing a thick steel plate and a method for setting a pass schedule. In the present invention, for example, when a thick steel plate is manufactured by TMCP by performing reverse rolling of a plurality of passes using a reversible rolling mill, both the target value of the rolling temperature and the final value of the final finishing temperature in the intermediate pass are used. The present invention relates to a thick steel plate manufacturing method and a pass schedule setting method that can greatly reduce the rolling time while being satisfied.
可逆式圧延機を用いた複数パスのリバース圧延を行ってＴＭＣＰ法により厚鋼板を製造する際には、コントロールド・ローリング圧延法（以下「ＣＲ圧延法」という）や、圧延後の水冷技術が広く用いられる。中でもＣＲ圧延法によれば、圧延中の圧延温度を高精度で制御して最終パスにおける最終仕上がり温度を所定の目標温度に一致させることにより、組織を微細化して強度及び靭性の改善を図ることができる。 When manufacturing thick steel plates by TMCP method by performing reverse rolling of multiple passes using a reversible rolling mill, there are controlled rolling rolling method (hereinafter referred to as “CR rolling method”) and water cooling technology after rolling. Widely used. Above all, according to the CR rolling method, the rolling temperature during rolling is controlled with high accuracy, and the final finishing temperature in the final pass is made to coincide with a predetermined target temperature, thereby refining the structure and improving the strength and toughness. Can do.
具体的には、このＣＲ圧延法は、製品の板厚ｔに対してある板厚（例えば２ｔ）にまで被圧延材が圧延された時点で一旦圧延を中断し、その後被圧延材を空冷することによって温度Ｔ０から所定温度Ｔ１まで冷却してから、圧延を再開することにより所定の板厚ｔになる最終パスにおける最終仕上がり温度を所定の温度とする。 Specifically, in this CR rolling method, when the material to be rolled is rolled to a certain thickness (for example, 2t) with respect to the product thickness t, the rolling is temporarily interrupted, and then the material to be rolled is air-cooled. Thus, after cooling from the temperature T0 to the predetermined temperature T1, the final finishing temperature in the final pass at which the predetermined thickness t is reached by restarting the rolling is set to the predetermined temperature.
このように、ＣＲ圧延法には、通常の圧延とは異なり、圧延の途中で一旦圧延を中断して被圧延材の温度がＴ０からＴ１になるまで空冷するために、この冷却に相応の時間を要し、圧延能率が低下するという問題があった。 Thus, unlike normal rolling, the CR rolling method temporarily stops the rolling in the middle of rolling and air-cools until the temperature of the material to be rolled reaches from T0 to T1. Therefore, there has been a problem that the rolling efficiency is lowered.
そこで、ＣＲ圧延法におけるこのような冷却時間を解消又は短縮するための発明がこれまでにも提案されている。
例えば、特許文献１、２には、圧延の途中でデスケーリング等を行って被圧延材を水冷することにより、冷却時間を短縮して圧延能率を向上させるための発明が開示されている。略述すると、これらの発明は、可逆式圧延機に近接して配置した冷却装置を用いて、温度Ｔ０から温度Ｔ１への被圧延材の冷却時間を短縮しようとするものである。
Thus, inventions for eliminating or shortening such cooling time in the CR rolling method have been proposed so far.
For example, Patent Documents 1 and 2 disclose inventions for shortening the cooling time and improving the rolling efficiency by performing descaling or the like in the middle of rolling and water-cooling the material to be rolled. Briefly, these inventions attempt to shorten the cooling time of the material to be rolled from the temperature T0 to the temperature T1 by using a cooling device arranged close to the reversible rolling mill.
また、特許文献３には、ＣＲ圧延法における温度Ｔ０から温度Ｔ１への冷却のための待ち時間を考慮してパススケジュールを決定する発明が開示されている。
特許文献１、２に記載された発明によれば、確かに冷却の待ち時間は減少すると思われる。しかし、特許文献１、２にはパススケジュールをどのように設定するかについて何ら開示されていない。このため、特許文献１、２に記載された発明をそのまま実施すると、圧延の途中で行う冷却の程度によって、圧延の途中又は圧延後の被圧延材の平坦度や板厚の精度等が悪化する恐れがある。さらに、特許文献１、２では、圧延の途中における水冷のタイミングをどのように決定するのかも不明である。このため、例えばオペレータが任意のパスにおいて水冷を行った場合、計算機で予め予想していた温度と実績の温度とに差が生じ、この差に起因して圧延荷重にも差が生じ、結果的には板厚の精度が悪化し、平坦度不良を生じる可能性が大きい。 According to the inventions described in Patent Documents 1 and 2, it seems that the cooling waiting time is surely reduced. However, Patent Documents 1 and 2 do not disclose how to set the path schedule. For this reason, when the inventions described in Patent Documents 1 and 2 are carried out as they are, the flatness and thickness accuracy of the material to be rolled during or after rolling are deteriorated depending on the degree of cooling performed during rolling. There is a fear. Further, in Patent Documents 1 and 2, it is also unclear how to determine the timing of water cooling in the middle of rolling. For this reason, for example, when the operator performs water cooling in an arbitrary pass, there is a difference between the temperature predicted in advance by the computer and the actual temperature, and the difference in the rolling load is caused due to this difference. In this case, the accuracy of the plate thickness deteriorates, and there is a high possibility that a flatness defect will occur.
一方、特許文献３には、最適なパススケジュールを短時間で計算して設定する発明は記載されてはいるものの、冷却の待ち時間が本当に低減されるのか否かは不明であり、計算のロジックも追試可能な程度には記載されていない。 On the other hand, although Patent Document 3 describes an invention for calculating and setting an optimal path schedule in a short time, it is unclear whether or not the cooling waiting time is really reduced. However, it is not described to the extent that additional testing is possible.
本発明は、被圧延材を冷却する機能を有する１または２以上の装置と組み合わされた可逆式圧延機を用い、この被圧延材の温度を所定の目標温度に制御して行う１パスを少なくとも含む複数パスのリバース圧延を行うことによって厚鋼板を製造する際のパススケジュールの設定方法であって、計算機を用いて、
（ｉ）複数パスの全パスについて、前記装置により被圧延材を冷却したと仮定した場合における、複数パスのうちの最終パスにおける被圧延材の温度を計算により求め、求めた被圧延材の温度が、最終仕上がり温度の目標値を満足するか否か判断すること、（ｉｉ）求めた被圧延材の温度が最終仕上がり温度の目標値を下回る場合には、前記装置による被圧延材の冷却を停止することによって、被圧延材の温度が最終仕上がり温度の目標値を満足することができる、複数パスのうちの１又は２以上のパスを収束計算により決定すること、及び（ｉｉｉ）求めた被圧延材の温度が最終仕上がり温度の目標値を上回る場合には、複数パスに付加することによって、被圧延材の温度が最終仕上がり温度の目標値を満足することができる、圧下を行わない１または２以上のダミーパスを収束計算により決定することを特徴とするパススケジュールの設定方法である。
The present invention uses a reversible rolling mill combined with one or more apparatuses having a function of cooling a material to be rolled, and at least one pass performed by controlling the temperature of the material to be rolled to a predetermined target temperature. A method for setting a pass schedule when manufacturing a thick steel plate by performing reverse rolling of a plurality of passes, including using a computer,
(I) The temperature of the material to be rolled is obtained by calculating the temperature of the material to be rolled in the final pass among the plurality of passes when it is assumed that the material to be rolled has been cooled by the apparatus for all the multiple passes. Determining whether or not the final finished temperature target value is satisfied, and (ii) if the obtained temperature of the rolled material is lower than the final finished temperature target value, cooling of the rolled material by the apparatus is performed. Determining one or more of a plurality of passes by convergence calculation so that the temperature of the material to be rolled can satisfy the target value of the final finished temperature by stopping, and (iii) the obtained coverage When the temperature of the rolled material exceeds the target value of the final finishing temperature, by adding to multiple passes, the rolling material temperature can satisfy the target value of the final finishing temperature. It is a method of setting the pass schedule, characterized by determining the convergence calculation to have one or more dummy paths.
この本発明に係るパススケジュールの設定方法では、収束計算が、最終パスから一つ上流のパスについて順次行うことが望ましい。
別の観点からは、本発明は、被圧延材を冷却する機能を有する１または２以上の装置と組み合わされた可逆式圧延機を用い、この被圧延材の温度を所定の目標温度に制御して行う１パスを少なくとも含む複数パスのリバース圧延を行うことによって、厚鋼板を製造する方法であって、前記装置が、被圧延材のデスケーリング装置であるか、又は、このデスケーリング装置及び被圧延材を冷却する冷却装置であるとともに、複数パスのうちの最終パスにおける被圧延材の温度が最終仕上がり温度の目標値を満足するように、被圧延材に対する前記装置による複数のパス毎の冷却の実行又は不実行を、計算機による演算により複数パスを実行する前に予め決定しておき、複数のパスの際には、この決定に基づいて、装置による冷却を実行するか、又は実行しないこと、および前記計算機により、
（ｉ）前記複数パスの全パスについて、前記装置により被圧延材を冷却したと仮定した場合における、前記複数パスのうちの最終パスにおける前記被圧延材の温度を計算により求め、求めた前記被圧延材の温度が、最終仕上がり温度の目標値を満足するか否か判断すること、（ｉｉ）求めた前記被圧延材の温度が前記最終仕上がり温度の目標値を下回る場合には、前記装置による前記被圧延材の冷却を停止することによって、前記被圧延材の温度が前記最終仕上がり温度の目標値を満足することができる、前記複数パスのうちの１又は２以上のパスを収束計算により決定すること、及び（ｉｉｉ）求めた前記被圧延材の温度が前記最終仕上がり温度の目標値を上回る場合には、前記複数パスに付加することによって、前記被圧延材の温度が前記最終仕上がり温度の目標値を満足することができる、圧下を行わない１または２以上のダミーパスを収束計算により決定することを演算することを特徴とする厚鋼板の製造方法である。
In the path schedule setting method according to the present invention, it is desirable that the convergence calculation is sequentially performed for a path one upstream from the final path.
From another viewpoint, the present invention uses a reversible rolling machine combined with one or more apparatuses having a function of cooling the material to be rolled, and controls the temperature of the material to be rolled to a predetermined target temperature. A method of manufacturing a thick steel plate by performing reverse rolling of a plurality of passes including at least one pass performed in the above-described method, wherein the device is a descaling device for a material to be rolled, or the descaling device and A cooling device for cooling the rolled material, and cooling the material to be rolled for each of the plurality of passes by the device so that the temperature of the material to be rolled in the final pass of the plurality of passes satisfies the target value of the final finishing temperature. The execution or non-execution is determined in advance before executing a plurality of passes by calculation by a computer, and in the case of a plurality of passes, cooling by the apparatus is executed based on this determination, The must not be executed, and the computer,
(I) For all the multiple passes, when the material to be rolled is assumed to be cooled by the apparatus, the temperature of the material to be rolled in the final pass of the plurality of passes is obtained by calculation, and the obtained material to be obtained is obtained. Determining whether the temperature of the rolled material satisfies the target value of the final finishing temperature; (ii) if the determined temperature of the material to be rolled is lower than the target value of the final finishing temperature, By stopping the cooling of the material to be rolled, the temperature of the material to be rolled can satisfy the target value of the final finished temperature, and one or more of the multiple passes are determined by convergence calculation. And (iii) when the obtained temperature of the material to be rolled exceeds the target value of the final finished temperature, the temperature of the material to be rolled is increased by adding to the plurality of passes. It is possible to satisfy the target value of the final finishing temperature, a method for producing a steel plate, which comprises calculating determining the convergence calculation of one or more dummy paths is not performed pressure.
本発明に係るパススケジュールの設定方法及び鋼板の製造方法により、ＣＲ圧延法における最終パスにおける最終仕上がり温度を所定の温度に維持しながら、冷却のための待ち時間を減少させることができるとともに、平坦度及び板厚精度がともに良好な厚鋼板を製造することができる。 By the pass schedule setting method and the steel sheet manufacturing method according to the present invention, the final finishing temperature in the final pass in the CR rolling method can be maintained at a predetermined temperature, while the waiting time for cooling can be reduced and flattened. It is possible to manufacture a thick steel plate with good accuracy and thickness accuracy.
具体的には、本発明により、計算機の指示に基づいて各パス毎に被圧延材に対する水冷の実施の有無を決定できるため、ＣＲ圧延法における冷却の待ち時間を大幅に低減でき、生産効率に大きな効果があるとともに、最終パスにおける最終仕上がり温度の誤差が少なくなり、製品である厚鋼板の板厚精度を向上することもできる。 Specifically, according to the present invention, since it is possible to determine whether or not to perform water cooling on the material to be rolled for each pass based on a computer instruction, the cooling waiting time in the CR rolling method can be greatly reduced, and production efficiency can be improved. In addition to having a great effect, the error of the final finishing temperature in the final pass is reduced, and the thickness accuracy of the thick steel plate as the product can be improved.
以下、本発明に係る厚鋼板の製造方法及びパススケジュールの設定方法を実施するための最良の形態を、添付図面を参照しながら詳細に説明する。
本実施の形態では、被圧延材を冷却する機能を有する１または２以上の装置、具体的には、被圧延材のデスケーリング装置であるか、又は、このデスケーリング装置及び被圧延材を冷却する冷却装置と組み合わされた可逆式圧延機を用い、この被圧延材の温度を所定の目標温度に制御して行う１パスを少なくとも含む複数パスのリバース圧延を、後述するパススケジュールにしたがって行うことによって、厚鋼板を製造する。
Hereinafter, the best mode for carrying out a method for manufacturing a thick steel plate and a method for setting a pass schedule according to the present invention will be described in detail with reference to the accompanying drawings.
In the present embodiment, one or two or more devices having a function of cooling the material to be rolled, specifically, a descaling device for the material to be rolled, or the descaling device and the material to be rolled are cooled. Using a reversible rolling mill combined with a cooling device to perform reverse rolling of a plurality of passes including at least one pass performed by controlling the temperature of the material to be rolled to a predetermined target temperature according to a pass schedule described later To manufacture a thick steel plate.
この際に本実施の形態では、厚鋼板のパススケジュールを、計算機を用いて、以下に列記する手順（ｉ）〜（ｉｉｉ）により設定する。
（ｉ）厚鋼板の製造に際して、通常、パススケジュールは、例えば「塑性と加工 ｖｏｌ．１６、Ｎｏ．１６８」の（厚板圧延における数式モデル）に記載された手順により、決定される。つまり、あるパスにおける被圧延材の所定の板厚に対して所定の目標温度が決められている場合、まず、仕上げ厚から上流パスに順次遡ってクラウン比率一定の法則に基づいて、各パスにおける入り側板厚を１パスずつ決定していく。この時、各パスにおける被圧延材の温度は適当に仮定する。そして、例えば幅出圧延が終了し、仕上げ圧延の１パス目に入る板厚になる上流パスまで、入り側板厚を計算する。
At this time, in the present embodiment, the pass schedule of the thick steel plate is set by a procedure (i) to (iii) listed below using a computer.
(I) When manufacturing a thick steel plate, the pass schedule is usually determined by the procedure described in “Mathematical model in thick plate rolling” of “Plasticity and processing vol. 16, No. 168”, for example. That is, when a predetermined target temperature is determined for a predetermined plate thickness of the material to be rolled in a certain pass, first, in each pass, based on the law of constant crown ratio going back to the upstream pass sequentially from the finish thickness. The entrance side plate thickness is determined for each pass. At this time, the temperature of the material to be rolled in each pass is assumed appropriately. Then, for example, the entry side plate thickness is calculated up to the upstream pass where the width rolling is finished and the plate thickness enters the first pass of finish rolling.
次に、上流パスから厳密に加熱炉から計算した温度、または仕上げパスに入る直前の実績温度と、各パス毎に計算した入り側板厚とを用いて、下流パスに向かって各パス毎に被圧延材の温度を計算していく。このような計算を、被圧延材の温度が収束するまで、すなわち最終パスにおける最終仕上がり温度が目標値に入るまで、繰返し計算する。 Next, using the temperature calculated from the heating furnace strictly from the upstream path, or the actual temperature just before entering the finishing path, and the entry side plate thickness calculated for each path, it is covered for each path toward the downstream path. Calculate the temperature of the rolled material. Such calculation is repeated until the temperature of the material to be rolled converges, that is, until the final finishing temperature in the final pass reaches the target value.
このように、本発明では、基本的なパススケジュールの計算は、上記「塑性と加工 ｖｏｌ．１６、Ｎｏ．１６８」の（厚板圧延における数式モデル）に記載された手順、具体的にはこの文献の図１２に記載されたフローチャートに基づいてパススケジュールを計算する。 As described above, in the present invention, the basic pass schedule calculation is performed according to the procedure described in the “plasticity and processing vol.16, No.168” (mathematical model in thick plate rolling), specifically, The path schedule is calculated based on the flowchart described in FIG.
この際、本実施の形態では、複数パスの全パスについて、被圧延材を冷却する機能を有する１または２以上の装置により被圧延材を冷却したと仮定した場合における、複数パスのうちの最終パスにおける被圧延材の温度を計算により求め、求めた被圧延材の温度が、最終仕上がり温度の目標値を満足するか否か判断する。 At this time, in the present embodiment, the final of the plurality of passes when it is assumed that the material to be rolled is cooled by one or more apparatuses having a function of cooling the material to be rolled for all the multiple passes. The temperature of the material to be rolled in the pass is obtained by calculation, and it is determined whether or not the obtained temperature of the material to be rolled satisfies the target value of the final finishing temperature.
すなわち、本実施の形態が、従来の手順と異なる点は、計算開始時に上流パスから下流パスに向かって計算するに際して、被圧延材を冷却する機能を有する装置全てにより被圧延材を冷却すると仮定して、被圧延材の温度を計算する点である。 That is, this embodiment is different from the conventional procedure in that the material to be rolled is cooled by all devices having a function of cooling the material to be rolled when calculating from the upstream path to the downstream path at the start of calculation. Thus, the temperature of the material to be rolled is calculated.
なお、最終パスの近傍のパス（例えば最終パスの３パス前から最終パスの間）では、このような冷却装置を動作させないという制約を設けてもよい。このような制約は、可逆式圧延機の種類やオペレータの経験等に基づいて、自由に設定することができる。 It should be noted that there may be a restriction that such a cooling device is not operated in a path in the vicinity of the final path (for example, between three paths before the final path and the final path). Such constraints can be freely set based on the type of reversible rolling mill, operator experience, and the like.
本実施の形態では、このようにして被圧延材の温度を、第１パスから最終パスまで厳密に計算する。
（ｉｉ）本実施の形態では、求めた被圧延材の温度が最終仕上がり温度の目標値を下回る場合には、前記の装置による被圧延材の冷却を停止することによって、被圧延材の温度が最終仕上がり温度の目標値を満足することができる、複数パスのうちの１又は２以上のパスを収束計算を行うことによって、決定する。
In the present embodiment, the temperature of the material to be rolled is thus strictly calculated from the first pass to the final pass.
(Ii) In the present embodiment, when the obtained temperature of the material to be rolled is lower than the target value of the final finish temperature, the temperature of the material to be rolled is reduced by stopping the cooling of the material to be rolled by the above-described apparatus. One or two or more paths among a plurality of paths that can satisfy the target value of the final finished temperature are determined by performing convergence calculation.
この収束計算は、最終パスから一つ上流のパスについて順次行うことが望ましい。ここで収束するかどうかの判断において、最終パスで目標温度を大きく下回る場合、デスケーリング装置および／または水冷装置による水冷タイミングを、下流パスから上流パスへ向けて順次外していく。 It is desirable that this convergence calculation be sequentially performed for one path upstream from the final path. Here, in the determination of whether or not to converge, if the target temperature is significantly lower in the final pass, the water cooling timing by the descaling device and / or the water cooling device is sequentially removed from the downstream path toward the upstream path.
この外し方は、例えばデスケーリング装置から外し、それでも最終パスの温度が目標温度を下回る場合には水冷装置を外す。もちろん、計算時間を短くする意味では、デスケーリング装置および水冷装置を同時に外してもよい。 For example, when the temperature of the final pass is lower than the target temperature, the water cooling device is removed. Of course, in order to shorten the calculation time, the descaling device and the water cooling device may be removed at the same time.
下流パスから外していく理由は、下流パスほど板厚が薄いために冷却速度が大きくなるため、計算上、被圧延材の温度調整を行い易いためである。
このように、被圧延材の温度計算では、最終パスでの温度が目標温度に収束したかとの条件を加えることにより、被圧延材の最終パスにおける温度が最終仕上がり温度に収束するまで計算する。
The reason for removing from the downstream path is that the plate thickness is thinner in the downstream path and the cooling rate increases, so that it is easy to adjust the temperature of the material to be rolled in calculation.
Thus, in the temperature calculation of the material to be rolled, by adding the condition that the temperature in the final pass has converged to the target temperature, the temperature in the final pass of the material to be rolled is calculated until it converges to the final finish temperature.
（ｉｉｉ）一方、求めた被圧延材の温度が最終仕上がり温度の目標値を上回る場合には、複数パスに付加することによって、被圧延材の温度が最終仕上がり温度の目標値を満足することができる、圧下を行わない１または２以上のダミーパスを収束計算により決定する。 (Iii) On the other hand, when the obtained temperature of the rolled material exceeds the target value of the final finished temperature, the temperature of the rolled material may satisfy the target value of the final finished temperature by adding to a plurality of passes. One or two or more dummy paths that are not subjected to reduction are determined by convergence calculation.
また、全てのデスケーリング装置および水冷装置により全パスの水冷を行う条件で被圧延材の温度計算を行っているにもかかわらず、被圧延材の最終パスの温度が目標の最終仕上がり温度より高くなる場合には、圧延途中（例えば所定の調整板厚）でオペレータに冷却を指示すること、具体的には、冷却種類（空冷や水冷）や、冷却時間等の情報を指示することが望ましい。 In addition, the temperature of the material to be rolled is calculated to be higher than the target final finish temperature even though the temperature of the material to be rolled is calculated under the condition that all passes are water cooled by all descaling devices and water cooling devices. In this case, it is desirable to instruct cooling to the operator during rolling (for example, a predetermined adjustment plate thickness), and specifically, to instruct information such as a cooling type (air cooling or water cooling) and a cooling time.
このような冷却指示を受けた場合、オペレータは、圧延を停止し、ダミーパスを入れて鋼板を冷却し、最終パスで目標温度となるように計算機の指示に基づいて冷却する。このケースは主として板厚が厚いものに適用される。 When receiving such a cooling instruction, the operator stops rolling, inserts a dummy pass, cools the steel sheet, and cools based on the instruction of the computer so as to reach the target temperature in the final pass. This case is mainly applied to a thick plate.
ダミーパスの指示方法については、調整板厚において最終パスでの温度が収束するように、冷却時間（鋼板搬送速度、パス数等）を計算する。なお、この計算は、最終パスから一つ上流のパスについて順次行うことが望ましい。 As for the dummy path instruction method, the cooling time (steel plate conveyance speed, number of passes, etc.) is calculated so that the temperature in the final pass converges in the adjustment plate thickness. Note that this calculation is preferably performed sequentially for a path upstream from the final path.
このようにして、複数パスのうちの最終パスにおける被圧延材の温度が最終仕上がり温度の目標値を満足するように、被圧延材に対する前記装置による複数のパス毎の冷却の実行又は不実行を、計算機による演算により複数パスを実行する前に予め決定しておき、複数のパスの際には、この決定に基づいて、装置による冷却を実行するか、又は実行しない。 Thus, execution or non-execution of cooling for each of the plurality of passes by the apparatus with respect to the material to be rolled is performed so that the temperature of the material to be rolled in the final pass of the plurality of passes satisfies the target value of the final finish temperature. Then, it is determined in advance before executing a plurality of passes by calculation by a computer, and in the case of a plurality of passes, cooling by the apparatus is executed or not executed based on this determination.
このようにして、本実施の形態により、厚鋼板が製造される。
この本実施の形態により、ＣＲ圧延法における最終パスにおける最終仕上がり温度を所定の温度に維持しながら、冷却のための待ち時間を減少させることができるとともに、平坦度及び板厚精度がともに良好な厚鋼板を製造することができる。具体的には、計算機の指示に基づいて各パス毎に被圧延材に対する水冷の実施の有無を決定できるため、ＣＲ圧延法における冷却の待ち時間を大幅に低減でき、生産効率に大きな効果があるとともに、最終パスにおける最終仕上がり温度の誤差が少なくなり、製品である厚鋼板の板厚精度を向上することもできる。
Thus, a thick steel plate is manufactured by this Embodiment.
According to this embodiment, while maintaining the final finishing temperature in the final pass in the CR rolling method at a predetermined temperature, the waiting time for cooling can be reduced, and both the flatness and the thickness accuracy are good. Thick steel plates can be manufactured. Specifically, since it is possible to determine whether or not water cooling is performed on the material to be rolled for each pass based on instructions from the computer, the cooling waiting time in the CR rolling method can be greatly reduced, and the production efficiency is greatly improved. In addition, the error in the final finishing temperature in the final pass is reduced, and the thickness accuracy of the thick steel plate as the product can be improved.
さらに、本発明を実施例を参照しながら詳細に説明する。
コントロール圧延の圧延状況を実施例として開示する。表１に示す組成を有する材質を用いて、仕上げ圧延開始寸法（厚み８５ｍｍ、幅４５７２ｍｍ、長さ５１６９ｍｍ）を製品寸法（厚み１４．５ｍｍ、幅４５７２ｍｍ、長さ３０３０３ｍｍ）まで圧延する際、ＣＲ条件として板厚２９ｍｍで圧延温度８４５℃以下，最終パスにおける噛み込み温度７７０℃が規制されている。
Further, the present invention will be described in detail with reference to examples.
The rolling situation of control rolling is disclosed as an example. When rolling the finish rolling start dimension (thickness 85 mm, width 4572 mm, length 5169 mm) to the product dimensions (thickness 14.5 mm, width 4572 mm, length 30303 mm) using the material having the composition shown in Table 1, CR conditions The rolling temperature is 845 ° C. or less and the biting temperature 770 ° C. in the final pass is regulated.
このＣＲ圧延材の、デスケーリング装置および水冷装置を使用しない場合、すなわち従来圧延におけるパススケジュールを表２に示す。ＣＲ条件である板厚２９ｍｍでの圧延温度：８４５℃との規制があるため、６パス目の板厚３３．７ｍｍと７パス目の板厚２９ｍｍとの間では、６３．４秒間の空冷を行っている。 Table 2 shows a pass schedule of the CR rolled material when the descaling device and the water cooling device are not used, that is, in the conventional rolling. Since there is a regulation of rolling temperature: 845 ° C at a plate thickness of 29 mm, which is a CR condition, between the plate thickness of 33.7 mm on the sixth pass and the plate thickness of 29 mm on the seventh pass, air cooling for 63.4 seconds is performed. Is going.
次に、本発明のデスケーリング装置および水冷装置を使用した場合の圧延パススケジュールを表３に示す。本実施例では、圧延パススケジュールの計算時に、デスケーリングを実施するパスと、水冷装置により冷却水を噴射するパスとを決定する。このデスケーリングを行うパス、および水冷を実施するパスの決め方は、まず、得られる厚鋼板の表面品質を良好にするために最低限実施する必要があるデスケーリングを行うパスをＣＰＵで決定する。次に、デスケーリングを最低限行う必要があるパス以外のパスについて、規定されたＣＲ条件を満たしつつ最も速い時間で圧延が終了するように、デスケーリングを行うパスと、水冷を行うパスとをＣＰＵで決定する。 Next, Table 3 shows a rolling pass schedule when the descaling device and the water cooling device of the present invention are used. In the present embodiment, at the time of calculating the rolling pass schedule, a pass for performing descaling and a pass for injecting cooling water by the water cooling device are determined. In determining the path for performing the descaling and the path for performing the water cooling, first, the CPU determines the path for performing the descaling that needs to be performed at least in order to improve the surface quality of the obtained thick steel plate. Next, for a path other than the path that needs to be minimally descaled, a path that performs descaling and a path that performs water cooling are set so that rolling is completed in the fastest time while satisfying the prescribed CR condition. Determined by CPU.
図１は、従来決定されていたパススケジュールと、本実施例により決定されたパススケジュールとについて、被圧延材の表面温度の推移の一例を示すグラフである。表２、表３およびこの図１に示すグラフより、本発明により決定されたパススケジュール通りに圧延を行えば、ＣＲ条件として規定されている板厚２９ｍｍでの圧延温度：８４５℃以下を、従来法と比較して５７．４ｓｅｃ速く満たすことができ、トータルの圧延時間も５７．６ｓｅｃ短縮することができるため、圧延能率を大幅に向上できた。 FIG. 1 is a graph showing an example of the transition of the surface temperature of the material to be rolled with respect to the pass schedule that has been conventionally determined and the pass schedule that has been determined according to the present embodiment. From Table 2 and Table 3 and the graph shown in FIG. 1, if rolling is performed according to the pass schedule determined according to the present invention, the rolling temperature at a plate thickness of 29 mm defined as CR conditions: Compared with the method, it can be satisfied 57.4 seconds faster, and the total rolling time can be shortened by 57.6 seconds, so that the rolling efficiency can be greatly improved.
また、本実施例では、ＣＰＵにより予め決定されたパスにしたがってデスケーリングおよび水冷を行い、これ以外のパスではデスケーリングおよび水冷を行わないため、被圧延材の温度の予測精度を向上することができ、これにより、製造される厚鋼板の寸法精度および平坦度をいずれも向上することができる。 Further, in this embodiment, descaling and water cooling are performed according to a path predetermined by the CPU, and descaling and water cooling are not performed in other paths, so that the accuracy of predicting the temperature of the material to be rolled can be improved. Thus, both the dimensional accuracy and flatness of the thick steel plate to be manufactured can be improved.
図２は、従来決定されていたパススケジュールと、本実施例により決定されたパススケジュールとについて、計算表面温度と、実績表面温度との関係を示すグラフである。同図にグラフで示すように、本実施例により、被圧延材の温度の予測精度を大幅に向上できるため、厚鋼板の寸法精度および平坦度をいずれも向上することができる。 FIG. 2 is a graph showing the relationship between the calculated surface temperature and the actual surface temperature for the pass schedule that has been determined in the past and the pass schedule that has been determined according to the present embodiment. As shown in the graph in the figure, according to this example, the accuracy of predicting the temperature of the material to be rolled can be greatly improved, so that both the dimensional accuracy and flatness of the thick steel plate can be improved.
Claims (3)
（ｉ）複数パスの全パスについて、前記装置により被圧延材を冷却したと仮定した場合における、前記複数パスのうちの最終パスにおける前記被圧延材の温度を計算により求め、求めた前記被圧延材の温度が、最終仕上がり温度の目標値を満足するか否か判断すること、
（ｉｉ）求めた前記被圧延材の温度が前記最終仕上がり温度の目標値を下回る場合には、前記装置による前記被圧延材の冷却を停止することによって、前記被圧延材の温度が前記最終仕上がり温度の目標値を満足することができる、前記複数パスのうちの１又は２以上のパスを収束計算により決定すること、及び
（ｉｉｉ）求めた前記被圧延材の温度が前記最終仕上がり温度の目標値を上回る場合には、前記複数パスに付加することによって、前記被圧延材の温度が前記最終仕上がり温度の目標値を満足することができる、圧下を行わない１または２以上のダミーパスを収束計算により決定すること
を特徴とするパススケジュールの設定方法。 Using a reversible rolling mill combined with one or two or more apparatuses having a function of cooling the material to be rolled, a plurality of passes including at least one pass performed by controlling the temperature of the material to be rolled to a predetermined target temperature It is a setting method of a pass schedule when manufacturing a thick steel plate by performing reverse rolling, using a computer,
(I) For all passes of a plurality of passes, when the material to be rolled is assumed to be cooled by the apparatus, the temperature of the material to be rolled in the final pass of the plurality of passes is obtained by calculation, and the obtained material to be rolled is obtained. Judging whether the temperature of the material satisfies the target value of the final finished temperature,
(Ii) When the obtained temperature of the material to be rolled is lower than the target value of the final finished temperature, the temperature of the material to be rolled is changed to the final finished temperature by stopping cooling of the material to be rolled by the apparatus. Determining one or more of the plurality of passes by convergence calculation that can satisfy a target temperature value; and (iii) determining the temperature of the material to be rolled as the target of the final finished temperature. When the value exceeds the value, by adding to the plurality of passes, the temperature of the material to be rolled can satisfy the target value of the final finished temperature, and one or more dummy passes without reduction are converged and calculated. A method for setting a path schedule, characterized by:
前記装置は、前記被圧延材のデスケーリング装置であるか、又は、該デスケーリング装置及び該被圧延材を冷却する冷却装置であるとともに、
前記複数パスのうちの最終パスにおける前記被圧延材の温度が最終仕上がり温度の目標値を満足するように、前記被圧延材に対する前記装置による前記複数のパス毎の冷却の実行又は不実行を、計算機による演算により前記複数パスを実行する前に予め決定しておき、前記複数のパスの際には、当該決定に基づいて、前記装置による冷却を実行するか、又は実行しないこと、および前記計算機により、
（ｉ）前記複数パスの全パスについて、前記装置により被圧延材を冷却したと仮定した場合における、前記複数パスのうちの最終パスにおける前記被圧延材の温度を計算により求め、求めた前記被圧延材の温度が、最終仕上がり温度の目標値を満足するか否か判断すること、（ｉｉ）求めた前記被圧延材の温度が前記最終仕上がり温度の目標値を下回る場合には、前記装置による前記被圧延材の冷却を停止することによって、前記被圧延材の温度が前記最終仕上がり温度の目標値を満足することができる、前記複数パスのうちの１又は２以上のパスを収束計算により決定すること、及び（ｉｉｉ）求めた前記被圧延材の温度が前記最終仕上がり温度の目標値を上回る場合には、前記複数パスに付加することによって、前記被圧延材の温度が前記最終仕上がり温度の目標値を満足することができる、圧下を行わない１または２以上のダミーパスを収束計算により決定することを演算すること
を特徴とする厚鋼板の製造方法。』 Using a reversible rolling mill combined with one or two or more apparatuses having a function of cooling the material to be rolled, a plurality of passes including at least one pass performed by controlling the temperature of the material to be rolled to a predetermined target temperature A method of manufacturing a thick steel plate by performing reverse rolling,
The apparatus is a descaling device for the material to be rolled, or a cooling device for cooling the descaling device and the material to be rolled.
Execution or non-execution of cooling for each of the plurality of passes by the apparatus with respect to the material to be rolled so that the temperature of the material to be rolled in the final pass of the plurality of passes satisfies a target value of a final finish temperature. Pre-determining before executing the plurality of passes by calculation by a computer, and performing cooling by the device or not based on the determination in the case of the plurality of passes, and the computer By
(I) For all the multiple passes, when the material to be rolled is assumed to be cooled by the apparatus, the temperature of the material to be rolled in the final pass of the plurality of passes is obtained by calculation, and the obtained material to be obtained is obtained. Determining whether the temperature of the rolled material satisfies the target value of the final finishing temperature; (ii) if the determined temperature of the material to be rolled is lower than the target value of the final finishing temperature, By stopping the cooling of the material to be rolled, the temperature of the material to be rolled can satisfy the target value of the final finished temperature, and one or more of the multiple passes are determined by convergence calculation. And (iii) when the obtained temperature of the material to be rolled exceeds the target value of the final finished temperature, the temperature of the material to be rolled is increased by adding to the plurality of passes. Computing the determining can satisfy the target value of the final finishing temperature, one or more dummy paths is not performed at a reduction by convergence calculation
A method for producing a thick steel plate. ]
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