JPH11319945A - Manufacture of steel plate and its device - Google Patents
Manufacture of steel plate and its deviceInfo
- Publication number
- JPH11319945A JPH11319945A JP10134918A JP13491898A JPH11319945A JP H11319945 A JPH11319945 A JP H11319945A JP 10134918 A JP10134918 A JP 10134918A JP 13491898 A JP13491898 A JP 13491898A JP H11319945 A JPH11319945 A JP H11319945A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- cooling
- steel plate
- shape
- camber
- 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.)
- Pending
Links
Landscapes
- Control Of Metal Rolling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、鋼板の製造方法
および装置、特に、熱間圧延された高温鋼板をオンライ
ンで加速冷却して、高品質の製品を製造する際に、平坦
度に優れ且つ残留応力のない鋼板を製造することができ
る、鋼板の製造方法および装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a steel sheet, and more particularly to a method for manufacturing a high-quality product by accelerated cooling of a hot-rolled high-temperature steel sheet online to produce a high-quality product. The present invention relates to a method and an apparatus for manufacturing a steel sheet that can manufacture a steel sheet having no residual stress.
【０００２】[0002]
【従来の技術】近年、高温鋼板の冷却と圧延とを組み合
わせた制御圧延やオンラインで鋼板を冷却する制御圧延
においては、製品の高品質化に伴って、高精度の温度制
御、特に、冷却停止温度制御が行われている。2. Description of the Related Art In recent years, in controlled rolling that combines cooling and rolling of a high-temperature steel sheet and controlled rolling that cools a steel sheet online, high-precision temperature control, especially cooling stoppage, has been accompanied by the improvement in product quality. Temperature control is being performed.
【０００３】一般に、熱間圧延された高温鋼板には、圧
延直後の鋼板の温度分布や形状あるいは表面状態の相違
に起因して、冷却中に冷却むらが生じやすい。鋼板の冷
却むらは、更に、冷却装置の特性にも起因して発生しや
すい。[0003] Generally, in hot-rolled high-temperature steel sheets, uneven cooling is likely to occur during cooling due to differences in the temperature distribution, shape or surface state of the steel sheets immediately after rolling. The unevenness in cooling of the steel sheet is more likely to occur due to the characteristics of the cooling device.
【０００４】鋼板に冷却むらが発生すると、冷却後に鋼
板の変形や、残留応力、材質のバラツキ等が発生する。
特に、熱間圧延された鋼板をオンラインで冷却する場合
には、鋼板の上面および下面に対する冷却が鋼板上下で
対称に行われにくいために、鋼板が変形して、通板障害
等の操業上のトラブルが発生する。しかも、このように
変形した鋼板は、後工程において、プレスや冷間矯正機
により矯正する必要があるので、コスト高となる。[0004] If the cooling unevenness occurs in the steel sheet, deformation of the steel sheet, residual stress, variation in material, etc. occur after cooling.
In particular, when cooling a hot-rolled steel sheet online, the cooling of the upper and lower surfaces of the steel sheet is difficult to be performed symmetrically above and below the steel sheet. Trouble occurs. In addition, since the steel sheet thus deformed needs to be corrected by a press or a cold straightening machine in a subsequent process, the cost is increased.
【０００５】そこで、オンラインで均一に鋼板を冷却す
るために、以下の観点からいくつかの技術が提案されて
いる。鋼板の冷却装置において、冷却後の冷却水の水切
りを完全に行い、そして、鋼板表面から速やかに残水を
除去して、鋼板の均一冷却を図る技術として、以下のも
のが知られている。 （１）実開昭５３−３９５０８号公報、特開平７−９０
２３号公報、実開昭８−１２５６１１号公報および実開
昭５９−１６１０６２号公報には、水切りロールを設
け、水切りロール出側の板幅方向中央部に水噴射ノズル
を設け、この水噴射ノズルから鋼板両側端部および水切
りロールに向けて水を噴射して、水切りを行い、かくし
て、鋼板を均一冷却する。 （２）特開昭６０−２０６５１６号公報および実開平７
−３３４０６号公報には、鋼板の上下にゴムライニング
ロールを設け、このロールによって鋼板を押圧して水切
りを行い、かくして、鋼板を均一冷却する。[0005] In order to uniformly cool the steel plate online, several techniques have been proposed from the following viewpoints. In a steel plate cooling device, the following is known as a technique for completely draining cooling water after cooling, and quickly removing residual water from the steel plate surface to uniformly cool the steel plate. (1) JP-A-53-39508, JP-A-7-90
No. 23, Japanese Utility Model Application Laid-Open No. 8-125611 and Japanese Utility Model Application Laid-Open No. 59-161062, a draining roll is provided, and a water injection nozzle is provided at a central portion in the plate width direction on the draining roll exit side. Water is sprayed toward both ends of the steel sheet and the draining roll to drain the water, thus uniformly cooling the steel sheet. (2) JP-A-60-206516 and Japanese Utility Model Laid-Open No.
In JP-A-33406, rubber lining rolls are provided above and below a steel plate, and the rolls are used to press the steel plate to drain the water, thus uniformly cooling the steel plate.
【０００６】しかし、上記（１）および（２）の技術に
よれば、幅広の厚鋼板の場合には、大量の冷却水を鋼板
の側端部に押しやり鋼板表面から排除することが困難で
ある。また、水切りロール、ゴムライニングロールによ
る漏水排除効果はある程度発揮されるが、鋼板に歪があ
る場合には、鋼板とこれらのロールとの隙間から冷却水
が流出する。However, according to the above techniques (1) and (2), in the case of a wide thick steel plate, it is difficult to push a large amount of cooling water to the side end of the steel plate and to remove it from the surface of the steel plate. is there. Although the drainage roll and the rubber lining roll exert a certain degree of water leakage elimination effect, if the steel plate is distorted, cooling water flows out from the gap between the steel plate and these rolls.
【０００７】特開昭６１−１５３２３５号公報、特開昭
６１−２６４１３７号公報、特開昭５９−１４４５１３
号公報および特開昭６３−１６８２１５号公報には、加
速冷却装置内で鋼板を冷却中に、鋼板の各部位での温度
履歴が鋼板上下面の対応する位置で、できるだけ同じに
なるように、鋼板を均一に冷却する技術が開示されてい
る。[0007] JP-A-61-153235, JP-A-61-264137, and JP-A-59-144513.
JP-A-63-168215 discloses that while cooling a steel sheet in an accelerated cooling device, the temperature history at each part of the steel sheet is as similar as possible at corresponding positions on the upper and lower surfaces of the steel sheet. A technique for uniformly cooling a steel sheet is disclosed.
【０００８】しかし、実際には、鋼板上面においては、
鋼板に衝突した冷却水の噴流による冷却に加えて、鋼板
の上面を流れる衝突後の滞留水による冷却水が存在す
る。一方、鋼板下面においては、鋼板に衝突した後の冷
却水は、重力によって直ちに鋼板から離脱するので、衝
突噴流のみによる冷却しか期待できない。従って、鋼板
の上下面を同じ方式で冷却する方法の場合には、上下対
称の冷却を行うことはできない。However, actually, on the upper surface of the steel sheet,
In addition to cooling by the jet of the cooling water that has collided with the steel sheet, there is cooling water due to stay water after collision flowing on the upper surface of the steel sheet. On the other hand, on the lower surface of the steel sheet, since the cooling water that has collided with the steel sheet immediately separates from the steel sheet due to gravity, only cooling by the collision jet can be expected. Therefore, in the case where the upper and lower surfaces of the steel plate are cooled in the same manner, vertically symmetric cooling cannot be performed.
【０００９】そこで、一般には、鋼板の下面に対する冷
却水の流速や流量を鋼板上面に対して大にしたり、また
は、鋼板下面の冷却長を鋼板上面の冷却長に比べて長く
したり、あるいは、鋼板下面側の冷却量と鋼板上面側の
冷却量とが同一になるように、例えば、鋼板上面側の冷
却量を調整することが必要とされていた。Therefore, generally, the flow velocity and flow rate of the cooling water with respect to the lower surface of the steel plate are made larger than the upper surface of the steel plate, or the cooling length of the lower surface of the steel plate is made longer than the cooling length of the upper surface of the steel plate. For example, it has been necessary to adjust the cooling amount on the steel sheet upper surface side so that the cooling amount on the steel sheet lower surface side and the cooling amount on the steel sheet upper surface side are the same.
【００１０】更に、鋼板の上下面に対する冷却量が同じ
であったとしても、鋼板長手方向の冷却分布は明らかに
相違する。即ち、鋼板上面側では、鋼板に衝突した冷却
水は、鋼板の表面上を流れるので、熱流速は、鋼板の長
手方向に一様であるのに対して、鋼板下面側では、衝突
した冷却水は、直ちに鋼板下面から離脱するために、鋼
板進行方向に向かって熱流速は降下する。Further, even if the cooling amount for the upper and lower surfaces of the steel sheet is the same, the cooling distribution in the longitudinal direction of the steel sheet is clearly different. That is, on the upper surface side of the steel sheet, the cooling water colliding with the steel sheet flows on the surface of the steel sheet, so that the heat flow rate is uniform in the longitudinal direction of the steel sheet, whereas In this case, since the steel sheet is immediately separated from the lower surface of the steel sheet, the heat flow rate decreases in the traveling direction of the steel sheet.
【００１１】鋼板下面の熱流速を上げるか、または、鋼
板上面の熱流速を下げる等の手段によって、鋼板上下面
の冷却量を同じにしても、局部的に見た場合に、鋼板長
手方向の位置によっては、常に、上下対称の冷却が行わ
れているとは言い難い。従って、鋼板の上面および下面
の温度履歴は同じにならず、その結果、このような温度
履歴の相違から、鋼板に残留歪や変形が生じることは避
けられず、上述した技術では、これらの点が解決されて
おらず、均一な冷却を行うことはできない。Even if the amount of cooling on the upper and lower surfaces of the steel sheet is made the same by means of increasing the heat flow rate on the lower surface of the steel sheet or decreasing the heat flow rate on the upper surface of the steel sheet, when viewed locally, the longitudinal direction of the steel sheet does not increase. Depending on the position, it is difficult to say that cooling is always performed vertically symmetrically. Therefore, the temperature histories of the upper surface and the lower surface of the steel sheet are not the same, and as a result, due to such a difference in the temperature histories, it is inevitable that residual strain or deformation occurs in the steel sheet. Is not solved, and uniform cooling cannot be performed.
【００１２】このように、鋼板を均一冷却することは、
実際には難しい。特に、鋼板の端部は温度低下しやすい
ので、この部分を含めて鋼板を均一に冷却することは至
難の業である。冷却後に、平坦な鋼板を得るためには、
歪の小さい状態の鋼板を冷却装置に送り込み、水切り性
を確保することと、冷却装置から送り出された鋼板を平
坦な形状に矯正することが不可欠である。そこで、以下
のような技術が知られている。As described above, the uniform cooling of the steel sheet
Actually difficult. In particular, since the temperature of the end portion of the steel sheet tends to decrease, it is extremely difficult to uniformly cool the steel sheet including this portion. After cooling, to obtain a flat steel plate,
It is indispensable to send a steel sheet with a small distortion to a cooling device to ensure drainage, and to correct the steel sheet sent from the cooling device into a flat shape. Then, the following technologies are known.
【００１３】特開昭５４−１２４８６４号公報には、熱
間圧延後の直後に設けられた第１ホットレベラーで矯正
後、この第１ホットレベラーの直後に設けられた冷却装
置で冷却を行い、更に、第２ホットレベラーで矯正し
て、平坦な鋼板を製造する技術が開示されている。以
下、従来技術１という。Japanese Patent Application Laid-Open No. 54-124864 discloses that after straightening by a first hot leveler provided immediately after hot rolling, cooling is performed by a cooling device provided immediately after the first hot leveler. Further, there is disclosed a technique of straightening with a second hot leveler to produce a flat steel sheet. Hereinafter, this will be referred to as “prior art 1”.
【００１４】特開平３−１２８１２２号公報には、圧延
材を第１ローラレベラーにて矯正後、冷却装置により加
速冷却し、第２ローラレベラーにて再度矯正して、平坦
な鋼板を製造する技術が開示されている。以下、従来技
術２という。Japanese Patent Application Laid-Open No. 3-128122 discloses a technique for producing a flat steel sheet by straightening a rolled material by a first roller leveler, accelerated cooling by a cooling device, and straightening again by a second roller leveler. Is disclosed. Hereinafter, the related art 2 will be referred to.
【００１５】特開昭６１−２６２４２８号公報には、熱
間圧延あるいは熱間矯正後に加速冷却し、この後、オン
ラインで矯正する際に、板幅方向の温度差が１０℃以下
になった時点で矯正して、平坦な鋼板を製造する技術が
開示されている。以下、従来技術３という。Japanese Patent Application Laid-Open No. Sho 61-262428 discloses that when hot rolling or hot straightening is followed by accelerated cooling and then straightening online, when the temperature difference in the sheet width direction becomes 10 ° C. or less. A technique for producing a flat steel sheet by straightening is disclosed. Hereinafter, the related art 3 will be referred to.
【００１６】[0016]
【発明が解決しようとする課題】しかし、上述した従来
技術１から３は、明らかに、加速冷却後の温度分布に応
じて、鋼板の形状、残留応力が変化するにもかかわら
ず、矯正装置には、何らの手段も講じられていないの
で、平坦度に優れ且つ残留応力のない鋼板を製造するこ
とは困難である。However, the above-mentioned prior arts 1 to 3 obviously require a straightening device despite the fact that the shape and the residual stress of the steel sheet change according to the temperature distribution after accelerated cooling. However, since no means has been taken, it is difficult to manufacture a steel sheet having excellent flatness and no residual stress.
【００１７】従って、この発明の目的は、圧延後の鋼板
の形状と、加速冷却および加速冷却前後における鋼板の
矯正とを互いに関連付けて制御することによって、熱間
圧延された高温鋼板をオンラインで加速冷却して、高品
質の製品を製造する際に、平坦度に優れ且つ残留応力の
ない鋼板を製造することができる、鋼板の製造方法を提
供することにある。Accordingly, an object of the present invention is to accelerate hot-rolled hot steel sheet online by controlling the shape of the steel sheet after rolling and the accelerated cooling and the straightening of the steel sheet before and after the accelerated cooling in association with each other. It is an object of the present invention to provide a method of manufacturing a steel sheet which can manufacture a steel sheet having excellent flatness and no residual stress when manufacturing a high-quality product by cooling.
【００１８】[0018]
【課題を解決するための手段】請求項１記載の発明は、
熱間圧延後の高温鋼板を加速冷却して、鋼板を製造する
方法において、加速冷却後の鋼板の条切り材に生じるキ
ャンバー量を予め求め、前記キャンバー量が０になるよ
うな変形を、加速冷却前に鋼板に加え、かくして、平坦
度に優れ且つ残留応力のない鋼板を製造することに特徴
を有するものである。According to the first aspect of the present invention,
In a method of manufacturing a steel sheet by accelerating and cooling a hot-rolled high-temperature steel sheet, a camber amount generated in a strip material of the steel sheet after the accelerated cooling is determined in advance, and a deformation such that the camber amount becomes zero is accelerated. In addition to the steel sheet before cooling, the present invention is characterized by producing a steel sheet having excellent flatness and no residual stress.
【００１９】請求項２記載の発明は、熱間圧延後の鋼板
の条切り材に生じるキャンバー量と、加速冷却後の鋼板
の条切り材に生じるキャンバー量とを予め求め、これら
のキャンバー量の合計が０になるような変形を、加速冷
却前に鋼板に加えることに特徴を有するものである。According to the second aspect of the present invention, the camber amount generated in the strip material of the steel sheet after hot rolling and the camber amount generated in the strip material of the steel sheet after accelerated cooling are determined in advance, and these camber amounts are calculated. It is characterized in that a deformation such that the sum becomes zero is added to the steel sheet before accelerated cooling.
【００２０】請求項３記載の発明は、熱間圧延機と、前
記熱間圧延機により圧延された鋼板を加速冷却するため
の加速冷却装置とを備えた、鋼板の製造装置において、
前記加速冷却装置の鋼板入側および鋼板出側の少なくと
も一方に、鋼板の形状変化を矯正するための形状矯正装
置を設け、前記形状矯正装置は、鋼板の形状を耳波形状
または中伸び形状に矯正するものであることに特徴を有
するものである。According to a third aspect of the present invention, there is provided an apparatus for manufacturing a steel sheet, comprising: a hot rolling mill; and an accelerating cooling device for accelerating and cooling the steel sheet rolled by the hot rolling mill.
At least one of the steel sheet entrance side and the steel sheet exit side of the accelerated cooling device, a shape straightening device for correcting a shape change of the steel plate is provided, and the shape straightening device changes the shape of the steel plate to an undulating shape or a middle elongated shape. It is characterized by being corrected.
【００２１】本願発明者等は、平坦度に優れ且つ残留応
力のない高強度鋼板を製造するために、以下のような試
験を実施した。長さ１０ｍ、板厚２５ｍｍの平坦な鋼板
を加速冷却し、次いで、この平坦な鋼板を鋼板長手方向
に条切りして、幅３００ｍｍの条切り材を複数枚得た。
そして、一番外側の条切り材のキャンバー量と条切り前
の平坦鋼板の加速冷却後の温度差との関係を調べた。こ
の結果を、図２に示す 。The present inventors conducted the following tests in order to produce a high-strength steel sheet having excellent flatness and no residual stress. A flat steel plate having a length of 10 m and a thickness of 25 mm was accelerated and cooled, and then the flat steel plate was cut in the longitudinal direction of the steel plate to obtain a plurality of strips having a width of 300 mm.
The relationship between the camber amount of the outermost strip material and the temperature difference after accelerated cooling of the flat steel sheet before stripping was examined. The result is shown in FIG.
【００２２】ここで、温度差とは、加速冷却後の板中央
部と板端部との間の表面温度差（板中央部温度−板端部
温度）である。条切り材が外側にくの字に湾曲したとき
の条切り材のキャンバー量を図中（＋）で表し、逆に内
側くの字に湾曲したときのキャンバー量を図中（−）で
表した。キャンバー量は、くの字状に湾曲した条切り材
の両端を結ぶ直線と条切り材の曲がりの頂部との間の距
離で表した。これらの事項は、以下の説明において同じ
である。Here, the temperature difference is a surface temperature difference between the central portion of the plate and the end portion of the plate after accelerated cooling (the temperature of the central portion of the plate minus the temperature of the end portion of the plate). The camber amount of the strip when the strip is curved outward is represented by (+) in the figure, and the camber when the strip is curved to the inside is represented by (-) in the figure. did. The camber amount was represented by a distance between a straight line connecting both ends of the strip-shaped curved member and the top of the bent portion of the strip-shaped member. These items are the same in the following description.
【００２３】図２において、板端部温度が板中央部温度
より低い場合（図２横軸の＋側）には、条切り材は、外
側にくの字に湾曲し、一方、板端部の温度が板中央部温
度より高い場合（図２横軸の−側） には、条切り材
は、内側にくの字に湾曲し、これらの湾曲の程度は、温
度差が大きくなるほど大きくなることが分かる。In FIG. 2, when the temperature at the end of the plate is lower than the temperature at the center of the plate (+ side of the horizontal axis in FIG. 2), the strip material is bent outward in a V-shape. When the temperature is higher than the temperature at the center of the plate (negative side of the horizontal axis in FIG. 2), the strips are curved in a V-shape, and the degree of these curvatures increases as the temperature difference increases. You can see that.
【００２４】また、図３に示すようなローラー式形状矯
正装置においては、ワークロール２のベンディング量を
調整することによって、条切り材のキャンバー量を制御
できる。即ち、ワークロール２のベンディング量は、楔
３の押し込み量によって調整することができる。例え
ば、中伸び形状の鋼板に対しては、楔３を押し込むこと
によって、ワークロール２が湾曲（上ワークロールが下
に凸になるように変形）して、板中央部が板端部に比べ
てより多く圧下される。この結果、鋼板が平坦に矯正さ
れるので、条切り材のキャンバー量を減少させることが
できる。In a roller-type shape correcting device as shown in FIG. 3, the amount of camber of the strip can be controlled by adjusting the amount of bending of the work roll 2. That is, the bending amount of the work roll 2 can be adjusted by the pushing amount of the wedge 3. For example, when a wedge 3 is pushed into a medium-stretched steel plate, the work roll 2 is curved (the upper work roll is deformed so as to be convex downward), and the center of the plate is compared with the end of the plate. More pressure. As a result, since the steel plate is flattened, the camber amount of the strip material can be reduced.
【００２５】図４に、形状矯正装置の楔押し込み量をパ
ラメーターとしたときの、温度差とキャンバー量との関
係を示す。なお、このときの条切り前の鋼板は、平坦材
である。FIG. 4 shows the relationship between the temperature difference and the camber amount when the wedge pushing amount of the shape correction device is used as a parameter. At this time, the steel sheet before the sectioning is a flat material.
【００２６】図４から明らかなように、板端部温度が板
中央部温度より低い場合（図４横軸の＋側）には、楔の
押し込み量を多くするほどキャンバー量を小さくするこ
とができる。一方、板端部温度が板中央部温度より高い
場合（図４横軸の−側）には、楔の押し込み量を減らす
ほどキャンバー量を小さくできることが分かる。As is apparent from FIG. 4, when the temperature at the edge of the plate is lower than the temperature at the center of the plate (+ side of the horizontal axis in FIG. 4), the camber amount can be reduced as the pushing amount of the wedge increases. it can. On the other hand, when the temperature at the edge of the plate is higher than the temperature at the center of the plate (negative side of the horizontal axis in FIG. 4), it can be seen that the camber amount can be reduced by reducing the pushing amount of the wedge.
【００２７】例えば、図４において、板端部の温度が板
中央部の温度より１５０℃低い場合を例にとると、キャ
ンバー量を０に近づけるには、楔の押し込み量を多くす
れば良いことが分かる。なお、図４において、温度差が
０の場合でも、楔を押し込む必要があるのは、形状矯正
装置のワークロール２に鋼板１からの反力が作用するた
めである。For example, in FIG. 4, taking as an example a case where the temperature at the plate end is lower by 150 ° C. than the temperature at the plate center, in order to bring the camber amount close to 0, it is sufficient to increase the pushing amount of the wedge. I understand. In FIG. 4, the reason why the wedge needs to be pushed in even when the temperature difference is 0 is that a reaction force from the steel plate 1 acts on the work roll 2 of the shape correcting device.
【００２８】図５に、熱間圧延後、空冷で常温まで冷却
した場合の、即ち、熱間圧延後、加速冷却しない場合の
鋼板に生じた形状変化（耳波、中伸び）をパラメーター
としたときの、温度差とキャンバー量との関係を示す。FIG. 5 shows that the shape change (ear wave, middle elongation) that occurred when the steel sheet was cooled to room temperature by air cooling after hot rolling, that is, when the steel sheet was not subjected to accelerated cooling after hot rolling, was used as a parameter. The relationship between the temperature difference and the camber amount at the time is shown.
【００２９】なお、図５において、耳波とは、板端部が
板中央部に比べて余計に圧延されて伸び、板端部の平坦
度が不良となった状態をいい、中伸びとは、板中央部が
板端部に比べて余計に圧延されて伸び、板中央部の平坦
度が不良となった状態をいう。急峻度とは、下記式によ
って表されるもので、鋼板の形状変化の程度を示す指標
である。In FIG. 5, the ear wave refers to a state in which the plate edge is rolled and stretched more than the central portion of the plate, and the flatness of the plate edge becomes poor. In this state, the center of the plate is rolled and stretched more than the end of the plate, and the flatness of the center of the plate becomes poor. The steepness is represented by the following equation, and is an index indicating the degree of shape change of the steel sheet.
【００３０】急峻度λ＝（ｈ／Ｌ）×１００[ ％] 但し、上式において、ｈ：波高さ Ｌ：波長 図５から明らかなように、熱間圧延後、加速冷却しない
場合の鋼板の形状変化量が大きくなるほど、それだけキ
ャンバー量が大きくなる。従って、熱間圧延後の鋼板に
形状変化ある場合には、熱間圧延後の鋼板の条切り材に
生じるキャンバー量と、加速冷却後の鋼板の条切り材に
生じるキャンバー量とを予め求め、これらのキャンバー
量の合計が０になるような変形が加速冷却前に鋼板に加
わるように、形状矯正装置のワークロール２のベンディ
ング量を調整する必要がある。Steepness λ = (h / L) × 100 [%] In the above equation, h: wave height L: wavelength As is clear from FIG. The greater the shape change amount, the greater the camber amount. Therefore, when there is a change in the shape of the steel sheet after hot rolling, the camber amount generated in the strip material of the steel sheet after hot rolling, and the camber amount generated in the strip material of the steel sheet after accelerated cooling are determined in advance, It is necessary to adjust the bending amount of the work roll 2 of the shape correcting device so that the deformation such that the sum of these camber amounts becomes zero is applied to the steel sheet before accelerated cooling.
【００３１】例えば、図５において、板端部の温度が板
中央部の温度より１００℃低い場合を例にとると、平坦
材では、キャンバー量は、約１５ｍｍであるのに対し
て、耳波急峻度が２％の鋼板では、キャンバー量は、約
２０ｍｍである。従って、キャンバー量が増加した分、
形状矯正装置の楔の押し込み量を増やして、ワークロー
ル２のベンディング量を大きくする必要があることが分
かる。For example, in FIG. 5, when the temperature at the edge of the plate is 100 ° C. lower than the temperature at the center of the plate, the camber amount of the flat material is about 15 mm, while the ear wave is about 15 mm. For a steel plate having a steepness of 2%, the camber amount is about 20 mm. Therefore, the amount of camber increased,
It can be seen that it is necessary to increase the bending amount of the work roll 2 by increasing the pushing amount of the wedge of the shape correcting device.
【００３２】[0032]
【発明の実施の形態】次に、この発明の一実施態様を図
面を参照しながら説明する。図１は、この発明の一実施
態様を示す概略構成である。Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration showing an embodiment of the present invention.
【００３３】図１において、４は、熱間圧延機、５は、
加速冷却装置、そして、６は、加速冷却装置５の鋼板入
側のラインに設けられた形状矯正装置である。形状矯正
装置６は、図３に示したように、楔３の押し込み量を調
整することによって、ワークロール２のベンディング量
を調整できるもので ある。In FIG. 1, 4 is a hot rolling mill and 5 is
The accelerated cooling device and 6 are shape correcting devices provided on the line of the accelerated cooling device 5 on the steel sheet entry side. As shown in FIG. 3, the shape correcting device 6 can adjust the bending amount of the work roll 2 by adjusting the pushing amount of the wedge 3.
【００３４】この発明によれば、以下のようにして、平
坦度に優れ且つ残留応力のない鋼板を製造することがで
きる。先ず、図４に示すような、形状矯正装置の楔押し
込み量をパラメーターとしたときの、温度差とキャンバ
ー量との関係を、種々の板厚、板幅の鋼板毎に予め求め
ておく。そして、加速冷却後の鋼板の板中央部温度と板
端部温度との温度差を測定し、測定した温度差と図４の
関係とに基づいて、キャンバー量が０になるように、形
状矯正装置６の楔３の押し込み量を調整する。According to the present invention, a steel sheet having excellent flatness and no residual stress can be manufactured as follows. First, as shown in FIG. 4, the relationship between the temperature difference and the camber amount when the wedge pushing amount of the shape correcting device is used as a parameter is obtained in advance for each steel plate having various thicknesses and widths. Then, the temperature difference between the plate central portion temperature and the plate end portion temperature of the steel plate after the accelerated cooling is measured, and the shape is corrected based on the measured temperature difference and the relationship in FIG. The pushing amount of the wedge 3 of the device 6 is adjusted.
【００３５】例えば、温度差が１００℃でキャンバー量
が２５ｍｍであった場合には、形状矯正機の楔３を２０
ｍｍ押し込むことによって、キャンバー量をほぼ０にす
ることができる。For example, when the temperature difference is 100 ° C. and the camber amount is 25 mm, the wedge 3 of the
By pushing in mm, the camber amount can be reduced to almost zero.
【００３６】このように、加速冷却後の鋼板の形状が、
例えば、耳波形状になる場合には、加速冷却前に予め矯
正機によって、鋼板形状が中伸び形状となるように矯正
する。これによって、平坦度に優れ且つ残留応力がない
鋼板を製造することができる。このような鋼板を条切り
して得られた条切り材も平坦度に優れ且つ残留応力がな
いものであることは勿論である。Thus, the shape of the steel sheet after accelerated cooling is
For example, in the case of an ear wave shape, before the accelerated cooling, the steel plate is previously corrected by a straightening machine so that the steel plate shape becomes a middle stretched shape. This makes it possible to manufacture a steel sheet having excellent flatness and no residual stress. It is a matter of course that a strip material obtained by stripping such a steel sheet is also excellent in flatness and has no residual stress.
【００３７】なお、熱間圧延後の鋼板の形状変化を加味
する場合には、図４の関係以外に、図５に示したよう
な、熱間圧延後、加速冷却しない場合の鋼板に生じた形
状変化（耳波、中伸び）をパラメーターとしたときの、
温度差とキャンバー量との関係を、種々の板厚、板幅の
鋼板毎に予め求めておく。そして、熱間圧延後の鋼板の
条切り材に生じるキャンバー量と、加速冷却後の鋼板の
条切り材に生じるキャンバー量とのキャンバー量の合計
が０になるような変形が加速冷却前に鋼板に加わるよう
に、形状矯正装置のワークロール２のベンディング量を
調整する。When the shape change of the steel sheet after the hot rolling is taken into consideration, in addition to the relationship shown in FIG. 4, the steel sheet which is not subjected to accelerated cooling after the hot rolling as shown in FIG. When shape change (ear wave, middle elongation) is used as a parameter,
The relationship between the temperature difference and the camber amount is obtained in advance for each steel plate having various thicknesses and widths. Then, the deformation such that the sum of the camber amount generated in the strip material of the steel sheet after hot rolling and the camber amount generated in the strip material of the steel sheet after accelerated cooling becomes zero becomes zero before the accelerated cooling. The bending amount of the work roll 2 of the shape correction device is adjusted so as to be added.
【００３８】例えば、熱間圧延後の温度差が１００℃で
キャンバー量が２０ｍｍであった場合には、平坦材に比
べてキャンバー量が５ｍｍ多い。従って、この分、楔の
押し込み量を増加させれば、平坦度に優れ且つ残留応力
のない鋼板を製造することができる。For example, when the temperature difference after hot rolling is 100 ° C. and the camber amount is 20 mm, the camber amount is 5 mm larger than that of the flat material. Therefore, if the amount of pushing of the wedge is increased by this amount, a steel plate having excellent flatness and no residual stress can be manufactured.
【００３９】以上は、形状矯正装置６を加速冷却装置５
の鋼板入側に設けたものであるが、図１に示すように、
加速冷却装置５の鋼板出側または両側に設けても良い。In the above, the shape correction device 6 is replaced with the acceleration cooling device 5
Although it is provided on the steel sheet entry side, as shown in FIG.
It may be provided on the steel sheet exit side or both sides of the accelerated cooling device 5.
【００４０】[0040]
【発明の効果】以上説明したように、この発明によれ
ば、圧延後の鋼板の形状と、加速冷却および加速冷却前
後における鋼板の矯正とを互いに関連付けて制御するこ
とによって、熱間圧延された高温鋼板をオンラインで加
速冷却して、高品質の製品を製造する際に、平坦度に優
れ且つ残留応力のない鋼板を製造することができるとい
った有用な効果がもたらされる。As described above, according to the present invention, hot rolling is performed by controlling the shape of the steel sheet after rolling and the accelerated cooling and the straightening of the steel sheet before and after the accelerated cooling in association with each other. When a high-temperature steel sheet is accelerated and cooled on-line to produce a high-quality product, a useful effect that a steel sheet having excellent flatness and no residual stress can be produced can be obtained.
【図１】この発明の概略構成図である。FIG. 1 is a schematic configuration diagram of the present invention.
【図２】キャンバー量と温度差との関係を示すグラフで
ある。FIG. 2 is a graph showing a relationship between a camber amount and a temperature difference.
【図３】形状矯正装置を示す正面図である。FIG. 3 is a front view showing the shape correcting device.
【図４】形状矯正装置の楔押し込み量をパラメーターと
したときの、温度差とキャンバー量との関係を示すグラ
フである。FIG. 4 is a graph showing the relationship between the temperature difference and the camber amount when the wedge pushing amount of the shape correction device is used as a parameter.
【図５】熱間圧延により鋼板に生じた形状変化パラメー
ターとしたときの、温度差とキャンバー量との関係を示
すグラフである。FIG. 5 is a graph showing a relationship between a temperature difference and a camber amount when a shape change parameter generated in a steel sheet by hot rolling is used.
１：鋼板 ２：ワークロール ３：楔 ４：熱間圧延機 ５：加速冷却装置 ６：形状矯正装置 1: steel plate 2: work roll 3: wedge 4: hot rolling mill 5: accelerated cooling device 6: shape correction device
Claims (3)
鋼板を製造する方法において、 加速冷却後の鋼板の条切り材に生じるキャンバー量を予
め求め、前記キャンバー量が０になるような変形を、加
速冷却前に鋼板に加え、かくして、平坦度に優れ且つ残
留応力のない鋼板を製造することを特徴とする、鋼板の
製造方法。Claims: 1. A high-temperature steel sheet after hot rolling is accelerated and cooled,
In the method for producing a steel sheet, a camber amount generated in the strip material of the steel sheet after accelerated cooling is determined in advance, and a deformation such that the camber amount becomes zero is added to the steel sheet before accelerated cooling, and thus the flatness is excellent. A method for producing a steel sheet, characterized by producing a steel sheet having no residual stress.
ャンバー量と、加速冷却後の鋼板の条切り材に生じるキ
ャンバー量とを予め求め、これらのキャンバー量の合計
が０になるような変形を、加速冷却前に鋼板に加えるこ
とを特徴とする、請求項１記載の、鋼板の製造方法。2. The camber amount generated in the strip material of the steel sheet after hot rolling and the camber amount generated in the strip material of the steel sheet after accelerated cooling are determined in advance, and the sum of these camber amounts becomes zero. The method for producing a steel sheet according to claim 1, wherein a significant deformation is applied to the steel sheet before accelerated cooling.
延された鋼板を加速冷却するための加速冷却装置とを備
えた、鋼板の製造装置において、 前記加速冷却装置の鋼板入側および鋼板出側の少なくと
も一方に、鋼板の形状変化を矯正するための形状矯正装
置を設け、前記形状矯正装置は、鋼板の形状を耳波形状
または中伸び形状に矯正するものであることを特徴とす
る、鋼板の製造装置。3. A manufacturing apparatus for a steel sheet, comprising: a hot rolling mill; and an accelerating cooling device for accelerating and cooling the steel sheet rolled by the hot rolling mill, wherein a steel sheet entering side of the accelerating cooling device and At least one of the steel sheet exit side is provided with a shape correction device for correcting a change in the shape of the steel plate, wherein the shape correction device corrects the shape of the steel plate to an ear wave shape or a middle stretch shape. To manufacture steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10134918A JPH11319945A (en) | 1998-05-18 | 1998-05-18 | Manufacture of steel plate and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10134918A JPH11319945A (en) | 1998-05-18 | 1998-05-18 | Manufacture of steel plate and its device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11319945A true JPH11319945A (en) | 1999-11-24 |
Family
ID=15139589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10134918A Pending JPH11319945A (en) | 1998-05-18 | 1998-05-18 | Manufacture of steel plate and its device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11319945A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005254264A (en) * | 2004-03-10 | 2005-09-22 | Jfe Steel Kk | Method for estimating deformation of thick steel plate, and its manufacturing method |
| KR100950961B1 (en) * | 2002-12-23 | 2010-04-02 | 주식회사 포스코 | Plate leveling-mill and control method |
| CN114164331A (en) * | 2021-11-24 | 2022-03-11 | 本钢板材股份有限公司 | Method for eliminating internal stress of high-strength steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH091240A (en) * | 1995-06-15 | 1997-01-07 | Nippon Steel Corp | Method for preventing deviation in surface temperature of thick steel plate |
| JPH105868A (en) * | 1996-06-18 | 1998-01-13 | Nippon Steel Corp | Method for controlling shape of control-cooled steel plate |
| JPH1015617A (en) * | 1996-07-04 | 1998-01-20 | Nkk Corp | Method for estimating bar cutting camber and manufacture of steel sheet minimized in bar cutting camber |
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1998
- 1998-05-18 JP JP10134918A patent/JPH11319945A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH091240A (en) * | 1995-06-15 | 1997-01-07 | Nippon Steel Corp | Method for preventing deviation in surface temperature of thick steel plate |
| JPH105868A (en) * | 1996-06-18 | 1998-01-13 | Nippon Steel Corp | Method for controlling shape of control-cooled steel plate |
| JPH1015617A (en) * | 1996-07-04 | 1998-01-20 | Nkk Corp | Method for estimating bar cutting camber and manufacture of steel sheet minimized in bar cutting camber |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100950961B1 (en) * | 2002-12-23 | 2010-04-02 | 주식회사 포스코 | Plate leveling-mill and control method |
| JP2005254264A (en) * | 2004-03-10 | 2005-09-22 | Jfe Steel Kk | Method for estimating deformation of thick steel plate, and its manufacturing method |
| JP4710237B2 (en) * | 2004-03-10 | 2011-06-29 | Ｊｆｅスチール株式会社 | Method for predicting deformation of thick steel plate and method for manufacturing the same |
| CN114164331A (en) * | 2021-11-24 | 2022-03-11 | 本钢板材股份有限公司 | Method for eliminating internal stress of high-strength steel |
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