JPH08243615A - Method for controlling nose camber in hot rolling - Google Patents
Method for controlling nose camber in hot rollingInfo
- Publication number
- JPH08243615A JPH08243615A JP7048577A JP4857795A JPH08243615A JP H08243615 A JPH08243615 A JP H08243615A JP 7048577 A JP7048577 A JP 7048577A JP 4857795 A JP4857795 A JP 4857795A JP H08243615 A JPH08243615 A JP H08243615A
- Authority
- JP
- Japan
- Prior art keywords
- amount
- slab
- tip
- zone
- heating furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、厚板圧延材（熱間圧
延鋼板）を製造する熱間圧延において、仕上圧延時に発
生する先端反り量をほぼ目標先端反り量となるように制
御できるようにした、熱間圧延における先端反り制御方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of controlling the amount of tip warpage that occurs during finish rolling in hot rolling for producing thick rolled material (hot rolled steel sheet) so as to be approximately the target amount of tip warpage. The present invention relates to a method for controlling tip warpage in hot rolling.
【０００２】[0002]
【従来の技術】加熱炉にてスラブを加熱し、その加熱さ
れたスラブを粗圧延及び仕上圧延して厚板圧延材を製造
する熱間圧延においては、圧延時に圧延材の先端部に反
りが発生することがある。この先端反りは、設備破損の
危険性や、特に仕上圧延後に加速冷却（制御冷却）を施
すＴＭＣＰ（Thermo Machanical Control Process ）鋼
板のような圧延材では不均一冷却による品質不良などを
招く原因となっている。先端反りは、圧延材の板厚方向
での上下の非対称性に起因して発生することが知られて
おり、この非対称性を生じさせる要因としては、圧延材
の上下面の温度差、上下ワークロールの周速度差、上下
ワークロールの径差、ピックアップなどが挙げられる。
そして、厚板圧延材を製造する熱間圧延の場合には、こ
れらの要因のうち主に、圧延でのデスケーリング水など
による圧延材上面温度の低下にともなう板厚方向での上
下温度差に起因することが知られている。2. Description of the Related Art In hot rolling in which a slab is heated in a heating furnace, and the heated slab is rough-rolled and finish-rolled to produce a thick-plate rolled material, the tip of the rolled material is not warped during rolling. May occur. This warpage of the tip causes the risk of equipment damage, and in particular, in rolled materials such as TMCP (Thermo Machanical Control Process) steel sheets that undergo accelerated cooling (controlled cooling) after finish rolling, causing poor quality due to uneven cooling. ing. It is known that the tip warp is caused by the vertical asymmetry of the rolled material in the plate thickness direction.The factors that cause this asymmetry are the temperature difference between the upper and lower surfaces of the rolled material, the upper and lower workpieces. Examples include the difference in peripheral speed of rolls, the difference in diameter between upper and lower work rolls, and pickup.
And, in the case of hot rolling to manufacture a thick rolled material, among these factors, mainly due to the vertical temperature difference in the plate thickness direction due to the decrease of the rolled material upper surface temperature due to descaling water in rolling. It is known to be caused.
【０００３】従来、この先端反りの防止を目的として先
端反りを制御する方法として、熱間圧延での仕上圧延に
おいて、前記のような先端反り発生要因を逆に制御パラ
メータとして制御するようにした方法が採用されてい
る。例えば、仕上圧延時に、ピックアップ量を制御する
方法、上下ワークロールの周速度差を制御する方法、圧
延材の上下面温度差を制御する方法などが提案されてい
る。Conventionally, as a method for controlling the tip warp for the purpose of preventing the tip warp, in the finish rolling in hot rolling, the above-mentioned factor of tip warp occurrence is conversely controlled as a control parameter. Has been adopted. For example, at the time of finish rolling, a method of controlling a pickup amount, a method of controlling a peripheral speed difference between upper and lower work rolls, a method of controlling a temperature difference between upper and lower surfaces of rolled material, and the like have been proposed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、加熱炉
にてスラブを加熱し、その加熱されたスラブを粗圧延及
び仕上圧延して厚板圧延材を製造する熱間圧延において
は、仕上圧延における前述した従来の先端反り制御だけ
では、圧延材の材質上の制約、圧延機の構造上あるいは
操業条件上の制約等により、発生する先端反り量に対し
て必要なその制御量を確保できず、確実に先端反りを制
御できないことがあった。なお、圧延材の材質上の制約
による例として、上下面温度差制御において、鋼板の上
面あるいは下面を冷却することにより温度差を制御する
場合、強度上昇の点から反り制御に必要なだけの冷却が
行えないことがある。圧延機の構造上の制約（設備上の
制約）による例として、上下ワークロール周速度差制御
において、ミルモータの能力によっては反り制御に必要
なだけの周速差が確保できないことがある。また、操業
上の制約による例として、生産性の点から、反り制御に
必要な全パスについて反り制御を適用できないことがあ
る。However, in the hot rolling in which the slab is heated in the heating furnace and the heated slab is rough-rolled and finish-rolled to produce a thick rolled sheet, the above-mentioned finish rolling is performed. With the conventional tip warp control alone, it is not possible to secure the necessary control amount for the tip warp amount that occurs due to restrictions on the material of the rolled material, restrictions on the rolling mill structure or operating conditions, etc. There was a case that the tip warp could not be controlled. As an example due to the restrictions on the material of the rolled material, when controlling the temperature difference by cooling the upper or lower surface of the steel plate in the temperature difference control of the upper and lower surfaces, the cooling required for warp control from the viewpoint of strength increase is required. May not be possible. As an example due to the structural restriction (equipment restriction) of the rolling mill, in the upper / lower work roll peripheral speed difference control, it may not be possible to secure a peripheral speed difference required for warpage control depending on the capability of the mill motor. Further, as an example due to operational restrictions, there is a case where the warp control cannot be applied to all the paths required for the warp control from the viewpoint of productivity.
【０００５】この発明は、前記事情に鑑みてなされたも
のであって、加熱炉にてスラブを加熱し、その加熱され
たスラブを粗圧延及び仕上圧延して厚板圧延材を製造す
る熱間圧延において、操業データに基づいて加熱炉での
加熱条件を適切に設定することで仕上圧延時に発生する
先端反り量がほぼ目標値となるようにすることができ、
これにより、他の反り制御と併用することなく単独にて
先端反り量を目標値に制御することができ、また、仕上
圧延工程において圧延材の材質上の制約、設備上の制
約、操業上の制約などがある場合でも、これらの制約の
範囲内における上下面温度差制御や上下ワークロール周
速度差制御等による反り制御と併用することで仕上圧延
終了時の先端反り量がゼロまたは最小となるようにする
ことができる、熱間圧延における先端反り制御方法を提
供することを目的とする。The present invention has been made in view of the above circumstances, and is a hot work for heating a slab in a heating furnace, and rough-rolling and finish-rolling the heated slab to produce a rolled thick plate. In rolling, by appropriately setting the heating conditions in the heating furnace based on the operation data, the amount of tip warpage that occurs during finish rolling can be made to be almost the target value,
As a result, the tip warp amount can be independently controlled to the target value without being used in combination with other warp control, and in the finish rolling process, there are restrictions on the material of the rolled material, restrictions on equipment, and operational problems. Even if there are restrictions, the amount of tip warpage at the end of finish rolling will be zero or minimum by using together with warpage control such as temperature control of upper and lower surfaces and peripheral speed difference of upper and lower work rolls within these restrictions. An object of the present invention is to provide a method for controlling tip warpage in hot rolling that can be performed as described above.
【０００６】[0006]
【課題を解決するための手段】前記の目的を達成するた
めに、請求項１の発明に係る熱間圧延における先端反り
制御方法は、加熱炉にてスラブを加熱し、その加熱され
たスラブを粗圧延及び仕上圧延して厚板圧延材を製造す
る熱間圧延において、予め操業データに基づいて、仕上
圧延時に発生する先端反り量を、加熱炉の加熱帯及び均
熱帯それぞれにおける上下部設定温度差と、前記加熱帯
及び均熱帯それぞれにおけるスラブの滞留時間とを変数
とする関数式として求めておき、しかる後、先端反り量
を制御すべき対象圧延材について、加熱炉の加熱帯及び
均熱帯それぞれにおけるそのスラブの予め定められた滞
留時間と仕上圧延時の目標先端反り量とを前記関数式に
適用することにより、仕上圧延時に発生する先端反り量
が前記目標先端反り量となるようにすべく加熱炉の加熱
帯及び均熱帯それぞれにおける上下部設定温度差を求め
て設定することを特徴とする。また、請求項２の発明に
係る熱間圧延における先端反り制御方法は、加熱炉にて
スラブを加熱し、その加熱されたスラブを粗圧延及び仕
上圧延して厚板圧延材を製造する熱間圧延において、予
め操業データに基づいて、仕上圧延時に発生する先端反
り量を、加熱炉の加熱帯及び均熱帯それぞれにおける上
下部設定温度差と、前記加熱帯及び均熱帯それぞれにお
けるスラブの滞留時間とを変数とする関数式として求め
ておき、しかる後、先端反り量を制御すべき対象圧延材
について、加熱炉の加熱帯及び均熱帯それぞれにおける
予め定められた上下部設定温度差と仕上圧延時の目標先
端反り量とを前記関数式に適用することにより、仕上圧
延時に発生する先端反り量が前記目標先端反り量となる
ようにすべく加熱炉の加熱帯及び均熱帯それぞれにおけ
るスラブの滞留時間を求めて設定することを特徴とす
る。In order to achieve the above object, a method for controlling tip warpage in hot rolling according to the invention of claim 1 heats a slab in a heating furnace, and heats the slab. In hot rolling to produce thick strip material by rough rolling and finish rolling, the amount of tip warpage that occurs during finish rolling is calculated based on the operation data in advance, and the upper and lower set temperatures in the heating zone of the heating furnace and the soaking zone are set. The difference and the residence time of the slab in each of the heating zone and the soaking zone are obtained as a function formula, and thereafter, for the target rolled material whose tip warp amount is to be controlled, the heating zone of the heating furnace and the soaking zone are set. By applying the predetermined residence time of the slab in each and the target tip warp amount during finish rolling to the functional expression, the tip warp amount that occurs during finish rolling is the target tip warp amount. And sets seeking upper and lower set temperature difference in each heating zone and soaking zone of a heating furnace to be such that the amount. Further, the tip warpage control method in hot rolling according to the invention of claim 2 is a hot rolling method in which a slab is heated in a heating furnace, and the heated slab is rough-rolled and finish-rolled to produce a rolled thick plate material. In rolling, based on the operation data in advance, the amount of tip warp that occurs during finish rolling, the upper and lower set temperature difference in each of the heating zone and the soaking zone of the heating furnace, and the residence time of the slab in each of the heating zone and the soaking zone Is obtained as a functional expression with a variable, and thereafter, for the target rolling material whose tip warp amount is to be controlled, the predetermined upper and lower temperature differences between the heating zone of the heating furnace and the soaking zone and the finish rolling By applying the target tip warp amount and the functional equation to the tip warp amount generated during finish rolling to be the target tip warp amount, the heating zone of the heating furnace and the soaking zone respectively. And sets seeking definitive residence time of the slab.
【０００７】[0007]
【作用】本発明者らは、加熱炉にてスラブを加熱し、そ
の加熱されたスラブを粗圧延及び仕上圧延して厚板圧延
材（熱間圧延鋼板）を製造する熱間圧延において、操業
データにより、加熱炉によるスラブの加熱条件と仕上圧
延時に発生する先端反り量との関係を調査し、その結
果、仕上圧延時に発生する先端反り量が、加熱炉の加熱
帯及び均熱帯それぞれにおける上下部設定温度差と、前
記加熱帯及び均熱帯それぞれにおけるスラブの滞留時間
とを変数とする関数式として表せるという知見を得た。
本願発明はこの知見に基づいて考え出されたものであ
る。The present inventors operate in hot rolling in which a slab is heated in a heating furnace, and the heated slab is rough-rolled and finish-rolled to produce a thick rolled sheet (hot rolled steel sheet). The relationship between the heating condition of the slab in the heating furnace and the amount of tip warpage that occurs during finish rolling was investigated using the data, and as a result, the amount of tip warpage that occurs during finish rolling shows that It was found that the difference between the set temperature of the section and the residence time of the slab in each of the heating zone and the soaking zone can be expressed as a functional expression.
The present invention was devised based on this finding.
【０００８】図５は加熱炉からの抽出時のスラブ上下面
温度差（上面温度から下面温度を減算した温度差）と仕
上圧延時に発生する最大の先端上反り量との関係の一例
を示すグラフ、図６は加熱炉からの抽出時のスラブ上下
面温度差と仕上圧延時に発生する先端平均反り量との関
係の一例を示すグラフである。ここで最大の先端上反り
量とは、仕上圧延を例えば第１から第７の計７パスで行
った場合、第１パスから第７パスでの先端上反り量の最
大値であり、先端平均反り量とは、第１パスから第７パ
スでの先端反り量の平均値である。図５及び図６より、
仕上圧延時に発生する先端反り量は、加熱炉からの抽出
時のスラブ上下面温度差とは対応関係があり、前記スラ
ブ上下面温度差を変数とする一次式の関数で表せること
がわかる。以下、この理由を説明する。FIG. 5 is a graph showing an example of the relationship between the temperature difference between the upper and lower surfaces of the slab (the temperature difference obtained by subtracting the lower surface temperature from the upper surface temperature) at the time of extraction from the heating furnace and the maximum warp amount of the tip generated during finish rolling. FIG. 6 is a graph showing an example of the relationship between the temperature difference between the upper and lower surfaces of the slab at the time of extraction from the heating furnace and the average amount of warp at the tip generated during finish rolling. Here, the maximum tip warp amount is the maximum value of the tip warp amount from the first pass to the seventh pass when the finish rolling is performed in a total of seven passes from the first to the seventh, and the tip average The warp amount is an average value of the warp amount at the tip in the first pass to the seventh pass. From FIG. 5 and FIG.
It can be seen that the amount of tip warpage that occurs during finish rolling has a corresponding relationship with the temperature difference between the upper and lower surfaces of the slab during extraction from the heating furnace, and can be expressed by a linear function that uses the temperature difference between the upper and lower surfaces of the slab as a variable. Hereinafter, the reason will be described.
【０００９】図７は加熱炉からの抽出時のスラブ上下面
温度差と仕上圧延開始時の圧延材上下面温度差との関係
の一例を示すグラフである。図７より、圧延材上下面温
度差とスラブ上下面温度差との間には、各圧延材の粗圧
延条件の差異により少しのバラツキはあるものの、比例
的な対応関係があり、仕上圧延時の圧延材上下面温度差
には、加熱炉からの抽出時のスラブ上下面温度差の影響
があることがわかる。なお、加熱炉からの抽出時に比べ
て仕上圧延開始時の方が上下面温度差が減少しているの
は、粗圧延でのデスケーリング水などによって上面側が
より冷却されるためである。FIG. 7 is a graph showing an example of the relationship between the temperature difference between the upper and lower surfaces of the slab at the time of extraction from the heating furnace and the temperature difference between the upper and lower surfaces of the rolled material at the start of finish rolling. From FIG. 7, there is a slight variation between the temperature difference between the upper and lower surfaces of the rolled material and the temperature difference between the upper and lower surfaces of the slab due to the difference in the rough rolling conditions of each rolled material, but there is a proportional correspondence relationship, and during finish rolling. It can be seen that the temperature difference between the upper and lower surfaces of the rolled material of 1 is affected by the temperature difference between the upper and lower surfaces of the slab during extraction from the heating furnace. The temperature difference between the upper surface and the lower surface at the start of finish rolling is smaller than that at the time of extraction from the heating furnace, because the upper surface side is cooled more by descaling water in rough rolling.
【００１０】この図７で示されること、及び、先端反り
が仕上圧延時の圧延材上下面温度差に起因した板厚方向
での変形抵抗差によるものであることから、仕上圧延時
に発生する先端反り量は、加熱炉からの抽出時のスラブ
上下面温度差とは対応関係があってしかもこれに大きく
影響されるものであることが理解される。As shown in FIG. 7 and because the tip warp is due to the difference in deformation resistance in the sheet thickness direction due to the temperature difference between the upper and lower surfaces of the rolled material during finish rolling, the tip generated during finish rolling. It is understood that the amount of warpage has a corresponding relationship with the temperature difference between the upper and lower surfaces of the slab during extraction from the heating furnace and is greatly affected by this.
【００１１】以上のことより、加熱炉からの抽出時のス
ラブ上下面温度差を所定の値に設定することで、仕上圧
延時に発生する先端反り量を所要の目標先端反り量にな
るようにしうることがわかる。そして、加熱炉からの抽
出時のスラブ上下面温度差は、熱伝導理論から、加熱炉
の加熱帯及び均熱帯それぞれにおける上下部設定温度差
（上部設定温度から下部設定温度を減算した温度差）Δ
Ｔi と、前記加熱帯及び均熱帯それぞれにおけるスラブ
の滞留時間Δｔi とにより定められるものである。した
がって、前記滞留時間Δｔi が予め定められている場合
には、前記上下部設定温度差ΔＴi を所定の値に設定す
ることで仕上圧延時に発生する先端反り量を所要の目標
先端反り量になるようにし得、また、前記上下部設定温
度差ΔＴ i が予め定められている場合には、前記滞留時
間Δｔi を所定の値に設定することで先端反り量を所要
の目標先端反り量になるようにし得る。このことは、図
８及び図９からも裏付けられる。図８はスラブの滞留時
間と仕上圧延時に発生する最大の先端上反り量との関係
の一例を示すグラフ、図９は加熱炉の均熱帯の上下部設
定温度差と仕上圧延時に発生する最大の先端上反り量と
の関係の一例を示すグラフである。From the above, the soot during extraction from the heating furnace
By setting the temperature difference between the top and bottom surfaces of the lab to a specified value, the finishing pressure
Set the amount of tip warpage that occurs during deferral to the required target tip warpage amount.
I understand that you can do so. And extract from the heating furnace
The temperature difference between the upper and lower surfaces of the slab at the time of discharge is based on the theory of heat conduction,
Temperature difference between upper and lower parts of heating zone and soaking zone
(Temperature difference obtained by subtracting the lower set temperature from the upper set temperature) Δ
TiAnd slabs in each of the heating zone and soaking zone
Dwell time ΔtiIt is defined by and. did
Therefore, the residence time ΔtiIs predetermined
Is the temperature difference ΔT above and below.iTo a predetermined value
The required target is the amount of tip warpage that occurs during finish rolling.
The tip warpage amount can be adjusted, and
Difference ΔT iIf is set in advance,
Interval ΔtiThe tip warpage amount is required by setting
The target tip warp amount of can be set. This is the figure
This is supported by 8 and FIG. 9. Fig. 8: When slab stays
Between the gap and the maximum amount of tip warpage that occurs during finish rolling
Fig. 9 is a graph showing an example of the heating furnace.
The constant temperature difference and the maximum amount of tip warpage that occurs during finish rolling
It is a graph which shows an example of the relationship of.
【００１２】以下、前記上下部設定温度差ΔＴi 、ある
いは前記滞留時間Δｔi を求めて設定する手順について
説明すると、まず、加熱炉からの抽出時のスラブ上下面
温度差ΔＴP 、および仕上圧延時に発生する先端反り量
ΔＨは、それぞれ下式で表される。The procedure for obtaining and setting the upper and lower set temperature difference ΔT i or the residence time Δt i will be described below. First, the temperature difference ΔT P between the upper and lower surfaces of the slab during extraction from the heating furnace and finish rolling. The amount of tip warpage ΔH that sometimes occurs is expressed by the following equations.
【００１３】 ΔＴP ＝Ｆ1 （ΔＴi ，Δｔi ） …（１） ΔＨ＝Ｆ2 （ΔＴP ） …（２）ΔT P = F 1 (ΔT i , Δt i ) (1) ΔH = F 2 (ΔT P ) (2)
【００１４】したがって、仕上圧延時に発生する先端反
り量ΔＨは、加熱炉の加熱帯及び均熱帯それぞれにおけ
る上下部設定温度差ΔＴi と、前記加熱帯及び均熱帯そ
れぞれにおけるスラブの滞留時間Δｔi とを変数とする
関数式で表される。Therefore, the amount of tip warpage ΔH that occurs during finish rolling is the difference ΔT i between the upper and lower set temperatures in the heating zone of the heating furnace and the soaking zone, and the residence time Δt i of the slab in each of the heating zone and the soaking zone. It is expressed by a function expression with a variable.
【００１５】 ΔＨ＝Ｆ2 （Ｆ1 （ΔＴi ，Δｔi ）） ＝Ｇ（ΔＴi ，Δｔi ） …（３）ΔH = F 2 (F 1 (ΔT i , Δt i )) = G (ΔT i , Δt i ) ... (3)
【００１６】前記（３）式は、近似的に、前記上下部設
定温度差ΔＴi と前記滞留時間Δｔ i とを変数とする一
次の関数式である下記の（４）式で表される。なお、
（４）式において、Ａは定数、Ｂi ＝（∂Ｈ／∂Δ
Ｔi ）、Ｃi ＝（∂Ｈ／∂Δｔi ）である。The equation (3) is approximately expressed by the upper and lower parts.
Constant temperature difference ΔTiAnd the residence time Δt iOne with and
It is represented by the following equation (4), which is the following functional equation. In addition,
In the equation (4), A is a constant and B isi= (∂H / ∂Δ
Ti), Ci= (∂H / ∂Δti).
【００１７】 ΔＨ＝Ａ＋Σ（Ｂi ・ΔＴi ＋Ｃi ・Δｔi ） …（４）ΔH = A + Σ (B i · ΔT i + C i · Δt i ) (4)
【００１８】前記（４）式中の定数Ａ，Ｂi ，Ｃi は、
対象となる加熱炉を用いる熱間圧延についての操業デー
タに基づいて決定できる。例えば、定数Ｂi は前記図
９、定数Ｃi は前記図８に示すデータなどから決定する
ことができる。なお、（４）式は、第１の加熱帯と第１
の均熱帯を有する加熱炉の場合には、第１の加熱帯の上
下部設定温度差：ΔＴ1 、第１の均熱帯の上下部設定温
度差：ΔＴ2 、第１の加熱帯でのスラブ滞留時間：Δｔ
1 、第１の均熱帯でのスラブ滞留時間：Δｔ2 、とする
と、次のように表される。ΔＨ＝Ａ＋Ｂ1 ・ΔＴ1 ＋Ｂ
2 ・ΔＴ2 ＋Ｃ1・Δｔ1 ＋Ｃ2 ・ｔ2 The constants A, B i and C i in the equation (4) are
It can be determined based on the operation data of hot rolling using the target heating furnace. For example, the constant B i can be determined from the data shown in FIG. 9 and the constant C i can be determined from the data shown in FIG. It should be noted that the equation (4) is obtained by using the first heating zone and the first heating zone.
In the case of a heating furnace having a soaking zone, the temperature difference between the upper and lower portions of the first heating zone: ΔT 1 , the temperature difference between the upper and lower portions of the first heating zone: ΔT 2 , the slab in the first heating zone Residence time: Δt
1 , and the slab residence time in the first soaking zone: Δt 2 , the following expression is obtained. ΔH = A + B 1 · ΔT 1 + B
2 · ΔT 2 + C 1 · Δt 1 + C 2 · t 2
【００１９】したがって、仕上圧延時に発生する先端反
り量ΔＨが所要の目標先端反り量ΔＨa となるようにす
るための加熱炉による加熱条件は以下のようにして求め
ることができる。加熱帯及び均熱帯それぞれにおけるス
ラブの滞留時間がΔｔiaに予め定められている場合に
は、各帯それぞれにおける上下部設定温度差ΔＴi は、
次式（５）により求め設定される。一方、加熱帯及び均
熱帯それぞれにおける上下部設定温度差がΔＴiaに予め
定められている場合には、各帯それぞれにおけるスラブ
の滞留時間Δｔi は、次式（６）により求め設定され
る。Therefore, the heating condition by the heating furnace for making the tip warp amount ΔH generated during finish rolling the required target tip warp amount ΔHa can be obtained as follows. When the residence time of the slab in each of the heating zone and the soaking zone is preset to Δt ia , the upper and lower set temperature difference ΔT i in each zone is
It is obtained and set by the following equation (5). On the other hand, when the upper and lower set temperature differences in the heating zone and the soaking zone are predetermined to ΔT ia , the slab residence time Δt i in each zone is calculated and set by the following equation (6).
【００２０】 ΔＴi ＝Ｇ-1（ΔＨa ，Δｔia） …（５） Δｔi ＝Ｇ-1（ΔＨa ，ΔＴia） …（６）ΔT i = G −1 (ΔHa, Δt ia ) (5) Δt i = G −1 (ΔHa, ΔT ia ) (6)
【００２１】そして、仕上圧延時に発生する先端反り量
として最大の先端上反り量ΔＨu 、最大の先端下反り量
ΔＨL 、先端平均反り量ΔＨAVのうちのいずれかを制御
対象する場合には、ΔＨa をΔＨu 、ΔＨL 、ΔＨAVの
いずれかとして、（５）式より各帯それぞれにおける上
下部設定温度差を求めることができ、また、（６）式よ
り各帯それぞれにおけるスラブの滞留時間を求めること
ができる。When any one of the maximum tip warp amount ΔHu, the maximum tip bottom warp amount ΔHL, and the average tip warp amount ΔHAV as the warp amount generated during finish rolling is to be controlled, ΔHa is set to As any of ΔHu, ΔHL, and ΔHAV, it is possible to obtain the temperature difference between the upper and lower parts of each zone by the equation (5), and the residence time of the slab in each zone by the equation (6). .
【００２２】このように、加熱炉にてスラブを加熱し、
その加熱されたスラブを粗圧延及び仕上圧延して厚板圧
延材を製造する熱間圧延において、予め操業データに基
づいて、仕上圧延時に発生する先端反り量を、加熱炉の
加熱帯及び均熱帯それぞれにおける上下部設定温度差
と、加熱帯及び均熱帯それぞれにおけるスラブの滞留時
間とを変数とする関数式として求めておき、しかる後、
先端反り量を制御すべき対象圧延材について、加熱帯及
び均熱帯それぞれにおけるスラブの滞留時間が予め定め
られている場合には、その滞留時間と目標先端反り量と
を前記関数式に適用することにより、先端反り量が目標
先端反り量となるようにすべく加熱炉の加熱帯及び均熱
帯それぞれにおける上下部設定温度差を求めることがで
き、一方、加熱帯及び均熱帯それぞれにおける上下部設
定温度差が予め定められている場合には、その上下部設
定温度差と目標先端反り量とを前記関数式に適用するこ
とにより、先端反り量が目標先端反り量となるようにす
べく加熱炉の加熱帯及び均熱帯それぞれにおけるスラブ
の滞留時間を求めることができ、これにより、仕上圧延
時に発生する先端反り量がほぼ目標先端反り量となるよ
うにすることができる。In this way, the slab is heated in the heating furnace,
In hot rolling in which thick slabs are manufactured by rough rolling and finish rolling of the heated slab, the amount of tip warpage that occurs during finish rolling is calculated based on the operation data in advance and the heating zone of the heating furnace and the soaking zone are set. The upper and lower set temperature difference in each, and the retention time of the slab in the heating zone and each of the soaking zones are obtained as a function formula, and then,
For the target rolled material whose tip warp amount is to be controlled, if the slab residence time in each of the heating zone and the soaking zone is predetermined, apply the residence time and the target tip warp amount to the functional formula. Can be used to obtain the upper and lower set temperature differences in the heating zone and soaking zone of the heating furnace so that the tip warp amount becomes the target tip warping amount. If the difference is predetermined, the temperature difference between the upper and lower parts and the target tip warp amount are applied to the above-mentioned functional expression, so that the tip warp amount becomes the target tip warp amount. The residence time of the slab in each of the heating zone and the soaking zone can be obtained, and by this, the amount of tip warpage that occurs during finish rolling can be made to reach the target tip warpage amount. That.
【００２３】[0023]
【実施例】以下、この発明の実施例について説明する。
実施例は、予熱帯と２つの加熱帯（第１加熱帯及び第２
加熱帯）と１つの均熱帯（第１均熱帯）とを有する加熱
炉にてスラブを加熱し、その加熱されたスラブを粗圧延
及び仕上圧延して厚板の普通圧延鋼板を製造する熱間圧
延において実施し、仕上圧延時に発生する最大の先端上
反り量（制御対象）がほぼ目標値に制御されていること
を確かめた。Embodiments of the present invention will be described below.
The example shows a pre-tropical zone and two heating zones (first heating zone and second heating zone).
A slab is heated in a heating furnace having a heating zone) and one soaking zone (first soaking zone), and the heated slab is rough-rolled and finish-rolled to produce a thick ordinary rolled steel sheet. It was carried out during rolling, and it was confirmed that the maximum amount of tip warpage (control target) that occurs during finish rolling is controlled to almost the target value.
【００２４】共通の実験条件は、実験対象材：ＳＳ４０
０、目標加熱平均温度：１２３０℃、スラブサイズ：厚
み２３５×幅１２３５×長さ２５００〜３５００ｍｍ、
仕上サイズ：板厚３０×幅２５００×長さ９７００〜１
３５００ｍｍ、仕上圧延時での最大の先端上反り量の目
標値：１５０ｍｍ，４５０ｍｍ、実験本数：各条件につ
き５本、である。Common experimental conditions are as follows: Material to be tested: SS40
0, target heating average temperature: 1230 ° C., slab size: thickness 235 × width 1235 × length 2500-3500 mm,
Finished size: Plate thickness 30 x width 2500 x length 9700 to 1
3,500 mm, target values of the maximum amount of warp at the tip during finish rolling: 150 mm, 450 mm, number of experiments: 5 under each condition.
【００２５】〔実施例１〕：この実施例１は、加熱帯及
び均熱帯それぞれにおけるスラブの滞留時間が各帯とも
５５分に予め定められている場合に、表１に示すよう
に、前記（４）式により、最大の先端上反り量の目標値
が１５０ｍｍのときの加熱帯及び均熱帯の上下部設定温
度差を求め、その求めた温度差に設定して熱間圧延を実
施した。また、最大の先端上反り量の目標値が４５０ｍ
ｍのときの加熱帯及び均熱帯の上下部設定温度差を求
め、その求めた温度差に設定して熱間圧延を実施した。[Example 1]: In Example 1, as shown in Table 1, when the residence time of the slab in each of the heating zone and the soaking zone was previously set to 55 minutes, The temperature difference between the heating zone and the upper and lower parts of the soaking zone when the target value of the maximum tip warp amount was 150 mm was obtained from the equation (4), and the hot rolling was performed by setting the obtained temperature difference. In addition, the target value of the maximum tip warp amount is 450 m
At the time of m, the temperature difference between the heating zone and the upper and lower parts of the soaking zone was calculated, and the temperature difference was set to the calculated temperature difference to carry out hot rolling.
【００２６】[0026]
【表１】 [Table 1]
【００２７】結果を図１及び図２に示す。図１及び図２
はこの発明の実施例１に係るグラフであって、図１は仕
上圧延の各パスにおける先端上反り量を示すグラフ、図
２は各鋼板の仕上圧延後の最大の先端上反り量を示すグ
ラフである。なお、図１に示されるグラフは、実験本数
５本のうちの１本についての結果を示すものである。図
１及び図２から理解されるように、仕上圧延時に発生す
る最大の先端反り量をほぼ目標値にすることができてい
る。The results are shown in FIGS. 1 and 2. 1 and 2
1 is a graph according to Example 1 of the present invention, FIG. 1 is a graph showing a tip warp amount in each pass of finish rolling, and FIG. 2 is a graph showing a maximum tip warp amount after finish rolling of each steel plate. Is. The graph shown in FIG. 1 shows the results for one of the five experiments. As can be understood from FIGS. 1 and 2, the maximum tip warp amount generated during finish rolling can be set to a substantially target value.
【００２８】〔実施例２〕：この実施例２は、加熱帯及
び均熱帯それぞれにおける上下部設定温度差が各帯とも
１０℃に予め定められている場合に、表２に示すよう
に、前記（４）式により、最大の先端上反り量の目標値
が１５０ｍｍのときの加熱帯及び均熱帯のスラブの滞留
時間を求め、その求めた滞留時間（各滞ともに４６．６
分）に設定して熱間圧延を実施した。また、最大の先端
上反り量の目標値が４５０ｍｍのときの加熱帯及び均熱
帯のスラブの滞留時間を求め、その求めた滞留時間（各
滞ともに５７．７分）に設定して熱間圧延を実施した。[Example 2]: In Example 2, as shown in Table 2, when the upper and lower set temperature differences in the heating zone and the soaking zone were previously set to 10 ° C, respectively, From equation (4), the residence time of the heating zone and the slab in the soaking zone when the target value of the maximum tip warp amount is 150 mm is obtained, and the obtained residence time (each delay is 46.6).
Min) and hot rolling was performed. In addition, the retention time of the heating zone and the slab in the soaking zone when the target value of the maximum tip warp amount is 450 mm is determined, and the retention time (57.7 minutes for each delay) is set and the hot rolling is performed. Was carried out.
【００２９】[0029]
【表２】 [Table 2]
【００３０】結果を図３及び図４に示す。図３及び図４
はこの発明の実施例２に係るグラフであって、図３は仕
上圧延の各パスにおける先端上反り量を示すグラフ、図
４は各鋼板の仕上圧延後の最大の先端上反り量を示すグ
ラフである。なお、図３に示されるグラフは、実験本数
５本のうちの１本についての結果を示すものである。両
図から理解されるように、仕上圧延時に発生する最大の
先端反り量をほぼ目標値にすることができている。The results are shown in FIGS. 3 and 4. 3 and 4
FIG. 3 is a graph according to Example 2 of the present invention, FIG. 3 is a graph showing the amount of tip warp in each pass of finish rolling, and FIG. 4 is a graph showing the maximum amount of tip warp after finish rolling of each steel plate. Is. The graph shown in FIG. 3 shows the results for one of the five experiments. As can be seen from both figures, the maximum amount of tip warpage that occurs during finish rolling can be made approximately the target value.
【００３１】[0031]
【発明の効果】請求項１、２の発明による熱間圧延にお
ける先端反り制御方法によると、加熱炉にてスラブを加
熱し、その加熱されたスラブを粗圧延及び仕上圧延して
厚板圧延材を製造する熱間圧延において、予め操業デー
タに基づいて、仕上圧延時に発生する先端反り量を加熱
炉での加熱条件を変数とする関数式として求めておき、
しかる後、先端反り量を制御すべき対象圧延材について
前記関数式に基づきそのスラブの加熱条件を設定するよ
うにしたものであるから、仕上圧延時に発生する先端反
り量がほぼ目標値となるようにすることができる。これ
により、他の反り制御と併用することなく単独にて先端
反り量を目標値に制御することができ、また、仕上圧延
工程において圧延材の材質上の制約、設備上の制約、操
業上の制約などがある場合でも、これらの制約の範囲内
における上下面温度差制御や上下ワークロール周速度差
制御等による反り制御と併用することで仕上圧延終了時
の先端反り量がゼロまたは最小となるようにすることが
できる。According to the tip warpage control method in hot rolling according to the first and second aspects of the present invention, a slab is heated in a heating furnace, and the heated slab is rough-rolled and finish-rolled to roll a thick plate. In hot rolling to produce, based on the operation data in advance, the amount of tip warpage that occurs during finish rolling is obtained as a functional expression with the heating condition in the heating furnace as a variable,
After that, since the heating condition of the slab is set based on the above-mentioned functional formula for the target rolled material whose tip warp amount is to be controlled, the tip warp amount generated during finish rolling becomes almost the target value. Can be As a result, the tip warp amount can be independently controlled to the target value without being used in combination with other warp control, and in the finish rolling process, there are restrictions on the material of the rolled material, restrictions on equipment, and operational problems. Even if there are restrictions, the amount of tip warpage at the end of finish rolling will be zero or minimum by using together with warpage control such as temperature control of upper and lower surfaces and peripheral speed difference of upper and lower work rolls within these restrictions. You can
【図１】この発明の実施例１に係るグラフであって、仕
上圧延の各パスにおける先端上反り量を示すグラフであ
る。FIG. 1 is a graph according to a first embodiment of the present invention, which is a graph showing a tip warpage amount in each pass of finish rolling.
【図２】この発明の実施例１に係るグラフであって、各
鋼板の仕上圧延後の最大の先端上反り量を示すグラフで
ある。FIG. 2 is a graph according to Example 1 of the present invention, which is a graph showing a maximum tip warp amount after finish rolling of each steel sheet.
【図３】この発明の実施例２に係るグラフであって、仕
上圧延の各パスにおける先端上反り量を示すグラフであ
る。FIG. 3 is a graph according to a second embodiment of the present invention and is a graph showing the amount of tip warpage in each pass of finish rolling.
【図４】この発明の実施例２に係るグラフであって、各
鋼板の仕上圧延後の最大の先端上反り量を示すグラフで
ある。FIG. 4 is a graph according to a second embodiment of the present invention, which is a graph showing a maximum tip warp amount after finish rolling of each steel plate.
【図５】本願発明の前提となる操業データに係るもので
あって、加熱炉からの抽出時のスラブ上下面温度差と仕
上圧延時に発生する最大の先端上反り量との関係の一例
を示すグラフである。FIG. 5 relates to the operation data that is the premise of the present invention, and shows an example of the relationship between the temperature difference between the upper and lower surfaces of the slab during extraction from the heating furnace and the maximum amount of warp at the tip that occurs during finish rolling. It is a graph.
【図６】本願発明の前提となる操業データに係るもので
あって、加熱炉からの抽出時のスラブ上下面温度差と仕
上圧延時に発生する先端平均反り量との関係の一例を示
すグラフである。FIG. 6 is a graph showing an example of the relationship between the temperature difference between the upper and lower surfaces of the slab during extraction from the heating furnace and the average amount of warp at the tip during finish rolling, which is related to operation data that is the premise of the present invention. is there.
【図７】本願発明の前提となる操業データに係るもので
あって、加熱炉からの抽出時のスラブ上下面温度差と仕
上圧延開始時の圧延材上下面温度差との関係の一例を示
すグラフである。FIG. 7 relates to the operation data that is the premise of the present invention, and shows an example of the relationship between the temperature difference between the upper and lower surfaces of the slab at the time of extraction from the heating furnace and the temperature difference between the upper and lower surfaces of the rolled material at the start of finish rolling. It is a graph.
【図８】本願発明の前提となる操業データに係るもので
あって、スラブの滞留時間と仕上圧延時に発生する最大
の先端上反り量との関係の一例を示すグラフである。FIG. 8 is a graph relating to operation data, which is a premise of the present invention, and is a graph showing an example of a relationship between a slab residence time and a maximum tip warp amount that occurs during finish rolling.
【図９】本願発明の前提となる操業データに係るもので
あって、加熱炉の均熱帯の上下部設定温度差と仕上圧延
時に発生する最大の先端上反り量との関係の一例を示す
グラフである。FIG. 9 is a graph relating to operation data which is a premise of the present invention, and is a graph showing an example of the relationship between the temperature difference between the upper and lower parts of the soaking zone of the heating furnace and the maximum tip warp amount generated during finish rolling. Is.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２１Ｄ 11/00 １０２ Ｂ２１Ｂ 37/00 ＢＢＪ １０５ 8315−4Ｅ １１６Ｒ (72)発明者 安部 研吾 兵庫県加古川市金沢町１番地 株式会社神 戸製鋼所加古川製鉄所内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location C21D 11/00 102 B21B 37/00 BBJ 105 8315-4E 116R (72) Inventor Kengo Abe Kakogawa, Hyogo Prefecture Kanazawa-cho, Yokohama-shi Kado Steel Works Kakogawa Works
Claims (2)
れたスラブを粗圧延及び仕上圧延して厚板圧延材を製造
する熱間圧延において、予め操業データに基づいて、仕
上圧延時に発生する先端反り量を、加熱炉の加熱帯及び
均熱帯それぞれにおける上下部設定温度差と、前記加熱
帯及び均熱帯それぞれにおけるスラブの滞留時間とを変
数とする関数式として求めておき、しかる後、先端反り
量を制御すべき対象圧延材について、加熱炉の加熱帯及
び均熱帯それぞれにおけるそのスラブの予め定められた
滞留時間と仕上圧延時の目標先端反り量とを前記関数式
に適用することにより、仕上圧延時に発生する先端反り
量が前記目標先端反り量となるようにすべく加熱炉の加
熱帯及び均熱帯それぞれにおける上下部設定温度差を求
めて設定することを特徴とする熱間圧延における先端反
り制御方法。1. Hot rolling in which a slab is heated in a heating furnace, and the heated slab is rough-rolled and finish-rolled to produce a rolled thick plate material, which occurs during finish rolling based on operation data in advance. The amount of tip warp to be, the upper and lower set temperature difference in each of the heating zone and the soaking zone of the heating furnace, and the retention time of the slab in each of the heating zone and the soaking zone are obtained as a function formula, and thereafter, For the target rolled material whose tip warp amount is to be controlled, by applying the predetermined residence time of the slab in each of the heating zone of the heating furnace and the soaking zone and the target tip warp amount during finish rolling to the above functional expression, In order to set the amount of tip warp that occurs during finish rolling to the target amount of tip warp, it is necessary to obtain and set the upper and lower set temperature differences in the heating zone and the soaking zone of the heating furnace. A method for controlling tip warpage in hot rolling.
れたスラブを粗圧延及び仕上圧延して厚板圧延材を製造
する熱間圧延において、予め操業データに基づいて、仕
上圧延時に発生する先端反り量を、加熱炉の加熱帯及び
均熱帯それぞれにおける上下部設定温度差と、前記加熱
帯及び均熱帯それぞれにおけるスラブの滞留時間とを変
数とする関数式として求めておき、しかる後、先端反り
量を制御すべき対象圧延材について、加熱炉の加熱帯及
び均熱帯それぞれにおける予め定められた上下部設定温
度差と仕上圧延時の目標先端反り量とを前記関数式に適
用することにより、仕上圧延時に発生する先端反り量が
前記目標先端反り量となるようにすべく加熱炉の加熱帯
及び均熱帯それぞれにおけるスラブの滞留時間を求めて
設定することを特徴とする熱間圧延における先端反り制
御方法。2. Hot rolling in which a slab is heated in a heating furnace, and the heated slab is rough-rolled and finish-rolled to produce a thick plate rolled material, which occurs during finish rolling based on operation data in advance. The amount of tip warp to be, the upper and lower set temperature difference in each of the heating zone and the soaking zone of the heating furnace, and the retention time of the slab in each of the heating zone and the soaking zone are obtained as a function formula, and thereafter, For the target rolled material whose tip warp amount is to be controlled, by applying the predetermined top and bottom set temperature difference in each of the heating zone and soaking zone of the heating furnace and the target tip warp amount at the time of finish rolling to the above functional expression. The slab residence time in each of the heating zone of the heating furnace and the soaking zone is set so that the tip warp amount generated during finish rolling becomes the target tip warp amount. Warp control method in hot rolling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04857795A JP3251455B2 (en) | 1995-03-08 | 1995-03-08 | Tip Warpage Control Method in Hot Rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04857795A JP3251455B2 (en) | 1995-03-08 | 1995-03-08 | Tip Warpage Control Method in Hot Rolling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08243615A true JPH08243615A (en) | 1996-09-24 |
| JP3251455B2 JP3251455B2 (en) | 2002-01-28 |
Family
ID=12807266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04857795A Expired - Fee Related JP3251455B2 (en) | 1995-03-08 | 1995-03-08 | Tip Warpage Control Method in Hot Rolling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3251455B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550248A (en) * | 2014-12-17 | 2015-04-29 | 秦皇岛首秦金属材料有限公司 | Incoming material thickness and rolling reduction-based rolling line regulation method |
| CN104858245A (en) * | 2014-02-26 | 2015-08-26 | 宝山钢铁股份有限公司 | Rough-rolling head warping and bending control method for hot continuous rolling mill based on multiple heating furnaces |
| JP2016163893A (en) * | 2015-03-06 | 2016-09-08 | Ｊｆｅスチール株式会社 | Control method of rolling mill, control device of rolling mill, and manufacturing method of steel plate |
| JP2021030300A (en) * | 2019-08-29 | 2021-03-01 | Ｊｆｅスチール株式会社 | Warp prediction method in hot rolling process, warp control method, hot-rolled steel sheet manufacturing method, warp prediction model generation method and hot rolling equipment |
| JP2021098213A (en) * | 2019-12-23 | 2021-07-01 | Ｊｆｅスチール株式会社 | Warpage prediction method in hot rolling, warpage control method, manufacturing method for hot-rolled steel plate, method for creating warpage prediction model and hot-rolling facility |
-
1995
- 1995-03-08 JP JP04857795A patent/JP3251455B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104858245A (en) * | 2014-02-26 | 2015-08-26 | 宝山钢铁股份有限公司 | Rough-rolling head warping and bending control method for hot continuous rolling mill based on multiple heating furnaces |
| CN104550248A (en) * | 2014-12-17 | 2015-04-29 | 秦皇岛首秦金属材料有限公司 | Incoming material thickness and rolling reduction-based rolling line regulation method |
| CN104550248B (en) * | 2014-12-17 | 2016-12-07 | 秦皇岛首秦金属材料有限公司 | A kind of roll line method of adjustment based on supplied materials thickness and drafts |
| JP2016163893A (en) * | 2015-03-06 | 2016-09-08 | Ｊｆｅスチール株式会社 | Control method of rolling mill, control device of rolling mill, and manufacturing method of steel plate |
| JP2021030300A (en) * | 2019-08-29 | 2021-03-01 | Ｊｆｅスチール株式会社 | Warp prediction method in hot rolling process, warp control method, hot-rolled steel sheet manufacturing method, warp prediction model generation method and hot rolling equipment |
| JP2021098213A (en) * | 2019-12-23 | 2021-07-01 | Ｊｆｅスチール株式会社 | Warpage prediction method in hot rolling, warpage control method, manufacturing method for hot-rolled steel plate, method for creating warpage prediction model and hot-rolling facility |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3251455B2 (en) | 2002-01-28 |
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